Hydraulic Report 3APPENDIX A -Project Maps
Vicinity Map
SCS Soils Map
Regional Topography
FEMA 100-Year Flood Plain Map
SHILLINGS CONNOLLY, INC. 5 Yelm Property Development LLC
Hytlrology Report
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APPENDIX B -Conveyance Calculations
Water Quality Calculations
Drywell Sizing
Computer Calculations
SKILLINGS CONNOLLY, INC. 6 Velm Property Development LLC
Hytlmlogy Report
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STORHWATEA MANAGEMENT MANUAL FOA THE PUGET SOUND BASIN
Figure III-3.17 Roof pownapout System
CB ~/~r
Trench)
_-_~,. Roo 1 -Trench
y~
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Possible Alignments Raof drain
PLAN VIEW ~
Nat to Scale
Observation Well / 6" Perforated Pipe
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PROFILE VIEW
nts
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A Sheet Cover Material
Roof
Drain
r min .---_-- .
L.wi ~ 1' mm.
I G .I 1' min.
i Fine
t' min~R ~~~, _ __ i mash I 5' min.
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A 6" Perforated Pipe Solid Lid
ICPEP single
wall acceptable)
varies 10' min.
Observation Well
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Compact Backfill
4"-6" PVC Pipe 4 .~~ _ bw+~ ~ 6" Perforated Pipe 14" acceptable
Iperforatedl for roof downspout systems)
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Entirely With
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SECTION A-A
~~ I Nat to Scala
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MGS FLOOD
PROJECT REPORT
Program Version: 2.27 Run Dale: 09/06/2006 3:44 PM
•*+xx*++*******x**+*****xx**+********x*xx*:*+++*t**+***x***++:****+*r:**x:*xx******
Input Fi 1e Name: 06099 A.f1d
Project Name The Hutch
Analysis Title: Basin 'A' -~
Comments
Extended Ti meseries Selected
Climatic Aegion Number: 11
Full Period of Record Available used for Routing
Precipitation Station 960040 Puget East 40 in NAP 10/01/1939-10/01/209"1
Evaporation Station 961040 Puget East 40 in NAP
Evaporation Scale Factor 0.']50
HSPF Parameter Region Number: 1
HSPF Parameter Region Name USGS Default
********* Default HSPF Parameters Used (Not Modified by User) ***************
Page 2
********* Watershed Definition **********
Number of Subbasins: 1
*** ***** Subbasin Number: 1 *********
* *Tributary to Node: 1
**=Bypass to Node None
Area (AC res)
-- ----developed - ----
Predeveloped To Node Bypass Node Include GW
Till Forest 0. 000 0 .000 0 .000 No
Till Pasture 0. 000 0 .000 0 .000 No
Till Grass 0. 000 0 .000 0 .000 No
Out wash Forest 0. 000 0 .000 0 .000 No
Ou[wash Pasture 8. 960 0 .000 0 .000 No
Outwash Grass 0. 000 3 .250 0 .000 No
Wetland 0 .000 0 .000 0 .000 No
Impervious 0. 000 5 .']10 0 .000
HNHBABIN TOTAL 8 .960 8 .960 0 .000
*** Subbasin Connection Summary ***
Subbasin 1 ----- > Node 1
*** By-Pass Area Connection Summary =**
No By-Passed Axeas in Watershed
Pond Inflow Node 1
Pond Outflow Node: 99
Page 10
************* Flow Frequency Data for Selected Recurrence Intervals *************
Subbasin 1 Runoff
Predevelopment*
Tr (Years) Flow (cf s)
6-Month 0.001
2-Year 0.003
5-Year 0.005
10-Year 0.024
25-Year 0.048
50-Year 0.149
100-Year 0.165
200-Year 0.232
* Recurrence Interval Computed Using
Subbasin 1 Aunoff
Postdevelopment*
Fl ow(cf s)
1.111
1.965
1.910
2.246
2.'125
3.124
3.561
9.042
Generalized Extreme
Value Distribution
Page 15
****************** Water Quality Facility Data ***************
H as is Wet Pond Volume (91% Exceedance): 24832. cu-ft
Computed Large Wet Pond Volume, 1.5*Basic Volume: 39298. cu-ft
15-Minute Timestep, Water Quality Treatment Design Discharge
Discharge Rates Computed for Node: 1 ~
On-line Design Discharge Rate (91% Exceedance) 0.99 c£s ~ YIlEA7/~7E./ /'
Of£-line Design Discharge Rate (91% Exceedance): 0.55 cfs FGV6~JC&ava A')
MGS FLOOD
PROJECT REPORT
Program Version: 2.27 Run Oate: 09/06/2006 3:58 PM
***x************+*****+*+***x**+++***xx*****+*x*x**+****:***************++*****xr.*
Input File Name: 06099 B.f1d
Project Name The Hutch
Analysis Title: Basin 'B' ~-
Comments
Extended Ti me series Selected
Climatic Region Number: 11
Full Period of Record Available used for Rou Cing
Precipitation Station 960040 Puget East 40 in NAP 10/01/1939-10/01/2099
Evaporation Station 961040 Puget East 40 in NAP
Evaporation Scale Factor 0.'150
HSPF Parameter Region Number: 1
HSPF Parameter Region Name USGS Default
********* Default HSPF Parameters Used (Not Modified by User) ***************
Page 2
*****""** Watershed Definition "*"*******
Number of Subbasins: 1
**** **** Subbasin Number: 1 *********
***Tributary to Node: 1
***Bypass to Node None
Area(AC res) ------- -- ---
-- ----Developed -- ---
Predeveloped To Node Bypass Node Include GW
Till Forest 0.000 0 .000 0. 000 No
Ti11 Pasture 0.000 0 .000 0. 000 No
Till Grass 0.000 0 .000 0. 000 No
Outwash Forest 0.000 0 .000 0. 000 No
Outwash Pasture 5.200 0 .000 0. 000 No
Outwash Grass 0.000 3 .290 0. 000 No
Wetland 0.000 0 .000 0. 000 No
Impervious 0.000 1 .910 0. 000
SUBBASIN TOTAL 5.200 5 .200 0. 000
**' Subbasin Connection Summary *'*
Subbasin 1 ---- > Node 1
*'* Hy-Pass Area Connection Sum mary ***
No By-Passed Areas in Watershed
Pond Inflow Node 1
Pond Outflow Node: 99
Page 11
*********"*** Flow Frequency Data for Selected Recurrence Intervals *************
Subbasin 1 RunoE£
Predevelopment*
Tr (Years) Flow(cf e)
6-Month 0.001
2-Year 0.002
5-Year 0.003
10-Year 0.014
25-Year 0.028
50-Year 0.08'1
100-Year 0.096
200-Year 0.135
* Recurrence Interval Computed Lsing
Subbasin 1 Runoff
Postdevelopmeat*
Flow (cf s)
0.3"]2
0.995
0.655
0.'180
0.962
1.11'1
1.292
1.48']
Generalized Extreme
Value Distribution
Page 16
****************** Water Quality Facility Data ***************
Basic Wet Pond Volume (91% Exceedance): 8348. w-ft
Computed Large Wet Pond Volume, 1.5*Basic Volume: 12522. cu-ft
15-Minute Timestep, Water Quality Treatment Design Discharge
Discharge Rates Computed Eor Node: 1 _
On-line Design Discharge Rate (91°s Exceedance): 0.30 cfs ~-/`~Fj,77J97E~/ /
Off-line Design Discharge Rate (91% Exceedance) 0.19 cfs /G~GJ
S/s" S/.J
x*************:e**+r:******+******x****:*****r:**x*x:******++****
5/8/06 3:37:35 pm Skillings Connolly, Inc page 1
THE HUTCH
SC 06099
____
_____________
_
__________
__________
______________
__________________ ________________
BASIN ____________
SUMMARY __
BASIN ID: A-100YR NAME: BASI N A - 100 YR STORM EVENT
SBUH METHODOLOGY
TOTAL AREA.......: 8.96 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE....: TYPElA PERV IMP
PRECIPITATION....: 4.00 inches AREA..: 3.25 Acres 5.71 Acres
TIME INTERVAL....: 10.00 min CN....: 76.00 98.00
TC....: 30.00 min 20.00 min
ABSTRACTION COEFF: 0.20
PEAK RATE: 4.85 cfs VOL: 2.26 Ac-ft TIME : 480 min
BASIN ID: A-6M0 NAME: BASIN A - 6 MO STORM EVENT
SBUH METHODOLOGY
TOTAL AREA:......: 8.96 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE....: TYPElA PERV IMP
PRECIPITATION....: 1.28 inches AREA..: 3.25 Acres 5.71 Acres
TIME INTERVAL....: 10.00 min CN....: 76.00 98.00
TC....: 30.00 min ~ 20.00 min
ABSTRACTION COEFF: 0.20
PEAK RATE: 1.19 cfs VOL: 0.54 Ac-ft TIME : 480 min
BASIN ZD: B-100YR NAME: BASI N B - 100 YR STORM EVENT
SBUH METHODOLOGY
TOTAL AREA.......: 5.20 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE....: TYPElA PERV IMP
PRECIPITATION....: 4.00 inches AREA..: 3.29 Acres 1.91 Acres
TIME INTERVAL....: 10.00 min CN....: 76.00 98.00
TC....: 30.00 min 20.00 min
ABSTRACTION COEFF: 0.20
PEAK RATE: 2.14 cfs VOL: 1.08 Ac-ft TIME : 460 min
BASIN ID: B-6M0 NAME: BASIN B - 6 MO STORM EVENT
SBUH METHODOLOGY
TOTALAREA.......: 5.20 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE....: TYPElA PERV IMP
PRECIPITATION....: 1.28 inches AREA..: 3.29 Acres 1.91 Acres
TIME INTERVAL....: 10.00 min CN....: 76.00 98.00
TC....: 30.00 min 20.00 min
ABSTRACTION COEFF: 0.20
PEAK RATE: 0.40 cfs VOL: 0.20 Ac-ft TIME : 480 min
5/8/06 3:37:35 pm Skillings Connolly, Inc page 2
THE HUTCH
SC 06099
DETAIL BASIN SUMMARY
BASIN ID: A-100YR NAME: BASIN A - 100 YR STORM EVENT
SBUH METHODOLOGY
TOTAL AREA.......: 8.96 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE....: TYPElA PERU
PRECIPITATION....: 4.00 inches AREA..: 3.25 Acres
TIME INTERVAL....: 10.00 min CN....: 76.00
TC....: 30.00 min
ABSTRACTION COEFF: 0.20
PEAK RATE: 4.85 cfs VOL: 2.26 Ac-ft TIME : 480 min
IMP
5.71 Acres
98.00
20.00 min
TIFID DS6I Q] TIME OSEIGN TIME -ES SGN TIME DESIGN TIME OSS IGN TIME D&$IGN
RUNOFF RUNOFF RUNOFF RUNOFF RUNOFF RUNOFF
(min) (c£e) (min) (c£e) (min) (c Ea) (min) (nts) (min) tees) (m In) (c£sl
10 ]10 0.9394 610 5.6831 910 1.1050 1210 O.B1O 1510 OA900
20 J20 1.0909 620 1.625] 920 1.1106 1220 0.81]") 1520 ~ 0.0266
30 3J0 1.3909 630 1.5910 930 1.1146 1230 0.81]5 1530 O.OlJB
40 0.0099 J90 1.2593 640 1.56")1 940 1.1141 1240 0.81'12 1590 0.0120
50 0.0232 ]50 1.3090 650 1.556] 950 1.11]0 1350 0.8160 1550 0.0082
60 0.0526 360 1.]9")2 660 1.5513 960 1.1206 1260 O.B155 1560 0.0056
JO 0.1032 J]0 1.J55] 6]0 1.990p 9]0 1.0]06 12]0 O.B1B9 15]0 0.0038
BO 0.3]1] J80 LJ995 680 1.3955 980 0.009] 1280 0.81"1"1 1580 0.0026
90 0.2]50 390 1.3919 690 1.3369 990 0.8016 1290 0.81]0 1590 0.0018
100 0.1916 900 1.]955 ]00 1.3094 1000 0.]93] 1300 0.8209 1600 0.0013
110 0.]408 410 1.J56] "I30 1.3811 1010 0,]090 1]10 0.8191 1fi 30 0.0009
120 0.]828 920 1.J660 ]20 1.26]2 1040 0.68J6 ll20 0.8189 1620 0.0006
1J0 0.9 J95 930 1.")006 ]30 1.4629 10]0 0.]JOB 1]]0 0.]893 1630 0.0004
190 0.49J6 990 2.29J9 ]90 1.2566 1090 0.8181 1]40 0.]424 1640 0.0003
150 0.5391 450 4.5939 ]50 1.35]6 1050 0.8]28 1]50 0.]130 1650 0.0002
160 0.5]2") 960 3.2969 760 1.2558 1060 0.90]5 1]60 0.6909 1660 0.0002
1")0 0.6033 UO 4.3298 7]0 1.254] 10"/0 0.9296 1]]0 0.6806 16]0 0,0001
180 0.6261 480 4.8963 ]80 1.2541 1080 0.9990 1]00 0.6]41 1680
190 0.6934 990 9.6116 ]90 1.1900 1090 0.9349 1]90 0.6669 1690
200 0.660] 500 3.83'!5 800 1.1055 1100 O.BB1] 1900 0.6651 1]00
310 0.6]52 510 3.]]05 810 1.04]6 1110 0.8543 1910 0.664] 1J10
220 0.6850 520 3.0390 830 1.0115 1120 0.9983 1920 0.6602 1]20
330 0.6969 90 2.]]93 B]0 0.9091 1130 0.0965 1930 0.6612 3]JO
290 0.]061 540 2.6269 840 0.9]52 1190 0.7572 1990 0.6621 3J90
250 0.]J95 550 2.]959 050 0.999] 1150 0.'1809 1950 O. SJ 96 1]50
260 0.]]91 560 2.1199 860 1.OJ86 1160 0.]911 1460 0.39]9 1]60
2]0 O.B004 5")0 1.9410 8]0 1.0665 11]0 0.]991 19]0 0.2201 1]JO
280 O. Bd 11 580 1.BJ 99 880 1.0808 1180 0.80]1 1980 0.1421 1]BO
390 0.0]29 590 1.]J]5 890 1.0939 1190 0.8089 1990 0.0929 1]90
]00 0.8420 600 1. ]J]8 900 1.1025 1200 0.8098 1500 0.0606 1800
5/8/06 3:37:35 pm Skillings Connolly, Inc page 3
THE HUTCH
SC 06099
DETAIL BASIN SUMMARY
BASIN ID: A-6M0 NAME: BASIN A - 6 MO STORM EVENT
SBUH METHODOLOGY
TOTAL AREA.......: 8.96 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE....: TYPElA PERU
PRECIPITATION....: 1.28 inches AREA..: 3. 25 Acres
TIME INTERVAL....: 10.00 min CN....: 76. 00
TC....: 30. 00 min
ABSTRACTION COEFF: 0.20
PEAK RATE: 1.19 cfs VOL: 0.54 Ac-ft TIME: 480 min
IMP
5.71 Acres
98.00
20.00 min
TIME DESIGN TIME DE6IGN TIME DESIGN TIME DESIGN TIME DEE SGN TIME DESIGN
RUNOFF RVNOFP RUNOFF RONO FP RUNOFF RUNOFF
(mint (c Eel (min) (cfal (mial (cfs) (min) (c£el (min) (c fa) (min) (cfs)
l0 310 e.n]e fila 0.3961 910 e.nn mo o.zo ]3 lsl0 e.oe e3
20 320 0.2563 620 0.]B]] 920 0.2]6] 1220 0.20D 1520 ~ 0.005]
30 330 O.d B]0 630 0.]]69 930 0.2]00 1230 0.20]9 1530 0.0039
40 340 0.3021 690 0.]]26 990 0.2]00 1z 90 0.2005 1590 0.0022
50 350 0.3162 650 0.]]15 950 0.3]92 1250 0.208) 1550 O.OOls
60 160 0.]2]1 660 O.J]15 960 0.2002 1260 0.20 BJ 1560 0.0010
]0 3]0 0.]302 6]0 0.]5]1 9]0 0.256] 12]0 0.209] 15]0 0.0006
80 380 0.]203 600 0.33]9 980 0.2300 1200 0.2091 1580 0.0009
90 0.0005 ]90 0.]281 690 0.3203 990 0.19]] 1290 0.2090 1590 0.0003
100 0.0818 900 0.]294 ]00 0.]ll] 1000 0.1832 1300 0,2101 1600 0.0002
110 0.0106 910 0.3]2] ]10 0.3086 1010 0.1]54 1310 0.2090 1610 0.0001
120 0.0192 420 0.]39] ]20 0.3061 1020 0.1]06 1320 0.2090 1620
130 0.0]0] 9J0 0.4180 ]]0 0.3059 1030 0.1828 1330 0.2021 1630
140 0.0939 490 0.5595 ]90 0.3052 1040 0.3069 1390 0.189] 1640
150 O.OS59 950 0.6905 ]50 0.3052 1050 O.d208 1350 0.1821 1650
160 0.06]5 460 0.019s ]60 0.3069 1060 O.zz90 1]60 0.1]66 1660
1]0 0.0]88 4]0 1.0939 ]]0 0.3066 30]0 0.2]55 13]0 0.1]42 16]0
100 O.OB91 980 1.109] ]00 0.30]1 1000 0.2391 1]BO 0.1 ]2B 1600
190 0.098) 990 1.119] ]90 0.2931 1090 O. 21J9 1290 0.1]09 1690
200 0.10]] 500 0.91]3 800 0.2695 1300 0.2229 1900 0.1]09 1]00
210 0.1155 510 0.]968 010 O.d 553 1110 0.2159 3410 0.1]00 1J10
220 O. 1z 26 520 0.]119 020 O. d469 1120 0.2900 1920 0.1699 1]z0
90 0.129] 530 0.6901 030 0.2920 1110 0.2269 1430 0.1]09 1]]0
290 0.1362 590 0.611] 890 0.2392 1190 0.1899 1990 0.1]0] 1]90
250 0.1966 550 0.5562 Bs0 0.2450 1150 0.19]0 1950 0.13]] 1]s0
z60 0.1593 560 0.4886 860 0.2s]0 1160 0.2004 1960 O.Oesl 1]60
z]0 0.1692 5]0 0.4490 0]0 0.2645 11]0 0.2026 19]0 0.0529 I]]0
280 0.1]]9 580 0.4269 000 0.2604 1180 0.2099 1980 0.0330 1JB0
390 0.1896 590 0.41]6 890 0.2]19 1190 0.2055 1990 0.020] 1]90
300 0.1905 600 0.4065 900 0.2]4] 1300 0.2060 1500 0.0131 1000
5/8/06 3:37:35 pm Skillings Connolly, Inc page 4
THE HUTCH
SC 06099
________________________DETAIL BASIN SUMMARY_________________________
BASIN ID: B-100YR NAME: BASIN B - 100 YR STORM EVENT
SBUH METHODOLOGY
TOTAL ARE A.... ...: 5.20 Acres BASEFLOWS: 0.00 cfs
RAINFALL TYPE. ...: TYPE lA PERU IMP
PRECIPITATION.. ..: 4.00 inches AREA..: 3.29 Ac res 1.91 Acres
TIME INTERVAL.. ..: 10. 00 min CN....: 76.00 98.00
TC_...: 3 0.00 mi n 20.00 min
ABSTRACTI ON COEFF: 0.20
PEAK RATE : 2 .14 cfs VOL : 1. 08 Ac-ft T IME: 480 min
TIME DESIGN TIME DESIGN TIME DESIGN S3ME DESIGN SIME DE6IGN TIME DESIGN
RUNOFF RNNOFF RUNOFF RUNOFF RUNOFF RDNOFF
(min) Icf s) (mivl (cE SI (min) Icfs)
_ (miv)
_~
. (cfs)
. (miv)
a~ (cf e)
~ (mivl (c Eel
- ___
10 _- __~~ _________
310 __________
0.]15] __ __ _
610 _ _ _ _
0.0991 _
_
_
910 ______ ____
0.5]]9 ____
1210 ____
_______
0.9 5] ________
1530 _______
0.0209
20 320 0.]]05 620 0.8220 920 0.5815 1220 0.9J SJ 1520 ~ 0.0200
30 3]0 0.9109 630 O.BO56 9]0 0.5093 1230 0.4354 1530 O.O3J9
40 0.0016 390 0.9416 640 0.]99J 990 0.5899 1340 0. 4J ]9 1590 0,009]
50 0.00]0 350 0.46]4 650 0.]09] 950 0.58]5 1350 0.9]]3 1550 0.0068
60 0.01]6 360 0.9900 660 0.]8]8 960 0.5895 1260 0.4]]1 1560 0.004]
]0 0.0]45 3]0 0.5019 6le 0.]601 9]0 0.5466 12]0 0.9]91 15]0 0.00]J
00 0.05]3 380 0.5066 680 0.]156 980 0.4]]6 1200 0.9]8] 1580 0.0024
90 0.0 ]B6 390 0.51]9 690 0.68]9 990 0.4]25 1290 0.4386 1590 0.001]
100 0.09]6 900 0.52]6 "100 0.6]12 1000 0.4013 1]00 0.4905 1600 0.0012
110 0.1190 910 0.5358 ]30 0.6596 1010 0.382) 3]10 0.4901 1610 0.0008
130 0.1281 420 0.59]0 ]20 0.6525 1020 0.3698 1J20 0.4400 1630 0.0006
1]0 0.1453 9J0 0.600] ]30 0.6501 1030 0.3891 1J30 0.4258 16]0 0.0004
190 0.1651 990 0.9199 J40 0.64]5 1040 0.9]10 1J90 0.4024 1690 0.000]
150 0.1003 950 1.0010 ]50 0.646] 1050 0.4586 3]50 0.38"11 1650 0.0002
160 0.1916 960 1.390] ]60 0.69]8 1060 0.4]]0 1J 60 0.325) 1660 0.0002
120 0.2019 920 3.022] ]]0 0.64]8 10]0 0.4899 1]20 0.3694 16]0 0.0001
100 0.2099 980 2.1395 ]BO 0.6409 1080 0.99]9 1J80 0.]659 1680
190 0.3152 990 3.0029 290 0.6222 1090 0.9099 3J90 0.]631 1690
200 0.2210 500 1.]]]9 800 O.PB1 1100 0.969] 3900 0.]600 1]Oc
210 0.2250 510 1.5912 810 0.5494 1110 0.9561 1410 0.3593 1210
220 0.2291 530 1.4530 020 0.900 1120 0.5010 1420 0.]5]1 D20
2J0 0.2330 90 3.J922 030 0.5109 1130 0.9]]6 1430 0.35]5 3]30
290 0.2362 590 1.2032 840 0.511] 1190 0.409] 1490 0.35]9 3]40
250 0.295] 550 3.1015 850 0.5199 1150 0.4196 3950 0.29]2 1]50
260 0.2509 560 1.0543 860 0.5910 1160 0.4292 3960 0.1982 1260
2]0 0.26]] 5]0 0.9]]9 8]0 0.5551 11]0 0.92]] 14]0 0.1332 1]]O
300 0.2]96 580 0.9290 080 0.56]0 1180 0.9312 1480 0.0901 1]00
290 0.2]86 590 O.B93] 890 0.5209 1190 0.9321 1990 0.O61J 1290
J00 0.2812 600 0.8]31 900 0.5]56 1200 0.4329 1500 0.0930 1800
5/8/06 3:37:35 pm Skillings Connolly, Inc page 5
'^HE HUTCH
~~ 06099
________________
DETAIL BASIN SUMMARY
BASIN ID: B-6M0 NAME: BASZN B - 6 MO STORM EVENT
SBUH METHODOLOGY
TOTAL AREA.......: 5.20 Acres BASEFLOWS: 0.00 cfS
RAINFALL TYPE....: TYPElA PERV IMP
PRECIPITATION....: 1.28 inches AREA..: 3.29 Acres 1.91 Acres
TIME INTERVAL....: 10.00 min CN....: 76.00 98.00
TC....: 30.00 min 20.00 min
ABSTRACTION COEFF: 0.20
PEAK RATE: 0.40 cfs VOL: 0.20 Ac-ft TIME: 480 min
TII~ D65IGN TIIID DESIGN TIME DESIGN TI1~ffi DESIGN TIME DESIGN TIME DPSIQI
AVNO PP RDNOFF RDNOFF RIIIiOFF RVNOPP AVNOFF
(min) (cfsl (min) Icf ~) (min) (c fa) (mint lee=1 (min) fete) (min) (cep)
10 J10 0.0]26 610 0.1402 910 e.110J 3210 0.0900 1510 0.0098
20 ]20 0.005] 620 0.1360 920 0.311] 1220 O.OB01 1520 O.O OJ2
30 330 0.094] 630 0.335] 930 0.1121 1230 0.0883 1530 0.0022
90 390 0.1010 690 O. 1J 9t 940 0.1124 1290 0.0009 1590 0.0015
50 350 0.1050 650 0.1351 950 0.1132 1250 0.0009 1550 0.0010
60 J60 0.1099 660 0.1360 960 O.11J9 3260 0.0091 1560 0.000]
00 3]0 0.1105 6]0 0.1315 9]0 0.1050 12]0 0.0096 15]0 0.0005
00 380 0.1098 600 0.12J0 900 0.0908 1200 0.009] 1580 0.0003
90 0.0002 390 0.109] 690 0.1199 990 0.0820 1290 0.0090 1590 0.0002
100 O.OO lJ 900 0.1102 ]00 0.11"13 1000 0.0]62 3]00 0.090] 1600 0.0002
110 0.00]5 910 0.1112 ]10 0.1161 1010 0.0]29 1]10 0.090] 1630 0.0001
120 0.0064 420 0.3119 ]20 0.1156 3020 0.0]09 1320 0.0905 1620
1J0 0.0101 930 0.1401 ]30 0.1160 lOJO 0.0]56 1330 0.08]4 1630
140 0.0145 990 0.1855 ]90 0.1162 1090 0.0049 1J40 0.0024 1690
150 0.010] 950 0.2142 ]50 0.1166 3080 0.0909 1350 O.O]9J 3650
160 0.0226 960 0.2]25 ]60 0.11]5 1060 0.099] 1360 0.0]]0 1660
1]0 0.0263 9]0 0.]992 ]]0 0.1100 10]0 0.09]3 13]0 0.0]59 16]0
180 0.0290 900 0.39]9 ]80 0.1186 1080 0.0990 1300 0.0]53 1600
190 0.0329 990 0.3]96 ]90 0.1130 1090 0.091] 1J90 0.0]46 3690
200 0.0]59 500 0.3060 900 0.1051 1100 0.0929 1400 0.0]95 1]00
210 0.0386 510 0.2665 810 0.3001 1110 0.0903 1910 0.0]96 1]10
220 0.0910 520 0.3300 020 0.09]1 1130 0.1005 1920 0.0]42 1]20
2]0 0.0934 5J0 0.21]1 030 0.0959 1130 0.0952 19]0 0.0]99 1]30
290 0.0956 590 0.2059 090 0.0995 1190 0.0006 1990 0.0]46 1]90
250 0.0990 550 0.1092 050 0.0969 3150 0.0033 1450 0.0611 1]50
260 0.0533 560 0.1664 060 0.101] 1160 0.084] 1460 0.0392 1]60
2]0 0.0566 540 0.1590 0]0 0.1049 11]0 0.0056 14]0 0.0254 1]]0
200 0.0595 580 0.14]6 880 0.106] 1180 0.096] 1900 0.0165 1]00
290 0.063] 590 0.1442 090 0.1094 1190 0.00]0 1990 0.0300 1]90
J00 O.O6J] 600 0.1920 900 0.1096 1200 0.08]3 1500 0.0032 1000
5/8/06 3:37:35 pm Skillings Connolly, Inc page 6
THE HUTCH
SC 06099
_____________________________________________________________________
____________________
DETAIL HYDROGRAPH SUMMARY
HYDROGRAPH No. 1
Peak runoff : 1 .1897 cfs Total Vol:
TIME DESIGN TIME DCSIGN TIME DRSIGN TIME DESIGN TIME
RUNOFF RUNOFF RDNOFF RUNOFF
(miNl Ic Ea) (min) Ic£e) Iminl Ic£el (mint (c£sl Im1n1
10 410 0.332] 810 0.2553 1210 0.20]3 1610
20 920 0,339] 820 0.2469 1220 0.20]3 1620
30 430 0.9188 830 0.2920 1230 0.20]4 1630
90 990 0.5595 840 0.2392 1290 0.2085 1640
50 450 0.6905 050 0.2450 1250 0.2083 1650
60 960 O.B195 860 0.25]0 1260 0.2083 1660
>0 9]0 1.04]9 840 0.2645 12]0 0.2093 16]0
BO 980 1.189] BBO 0.2689 12 B0 0,2091 1680
90 0.0005 990 1.319] 890 0.3]19 1290 0.2090 1690
loo e.aa3e see 0.9 v3 900 e. n43 veo e.uol vee
110 0.0106 510 0.]968 910 0.2>51 1310 0.2098 1]10
IIO 0.0192 520 0.]119 920 0.2]6] 1320 0.2090 1]20
130 0.030] 530 0.6481 930 0.2]80 1330 0.2021 1]30
140 0. 09 J9 590 0.611] 940 0.2]80 1390 0.109] 1>90
150 0.0559 550 0.5562 950 0.2]92 1]50 0.3821 1]50
160 0.06]5 560 0.4886 960 0.2802 1360 0.1>66 1]60
1]0 0.0>88 5]0 0.4490 9>0 0.256] 13]0 01]92 1]>0
180 0.0891 500 0.4269 980 0.3200 1J B0 0.1]28 1]BO
190 0.0983 590 0.9136 990 0.19]] 1390 0.1]09 1]90
200 0.10]3 600 0.4065 1000 O.1 BJ2 1900 0.1]09 3800
210 0.1155 610 0,3961 1010 0.1]54 1410 0.1>OB 1810
220 0.1226 630 0.383] 1020 0.1]06 1420 0.1699 1820
230 0.129] 6]0 O.J]69 lOJO O.1 B20 1930 0.1]09 1830
390 0.1362 640 O.J]26 1090 0.2064 1490 0.1]0] 1840
250 0.1466 650 0.3]15 1050 0.2200 1450 0.13]] 1850
260 0.1593 660 0.]]15 1060 0.3398 1960 0.0851 1860
2]0 01692 6>0 0.]5>1 10]0 0.2]55 19]0 0.0539 18]0
200 0.1]]9 600 O.J339 3000 0.2391 1980 0.0330 1880
390 01096 690 O.J203 1090 0.23]9 1990 0.030] 1090
]00 0.1905 ]00 0.3133 3100 0.2229 1500 0.01]1 1900
31- 0.21]0 ]10 0.3086 3110 0.2154 1510 O.OO B3 1910
320 0.256) ]20 O.JO61 1120 0.2908 1520 O.OO SJ 1920
]30 0.2830 ]30 0.3059 1130 0.2269 15]0 0.0039 1930
390 0.3021 >40 0.3052 1140 0.1899 1590 0.0032 1940
]50 0.3162 >50 0.3052 1150 0.19]0 1550 0.0015 1950
J60 0.]2>3 ]60 0.3069 1160 0.2009 1560 0.0010 ]960
3]0 O.J]02 ]]0 0.3066 11]0 0.2026 15]0 0.0006 39]0
300 OJSBJ >00 0.30>1 1100 0.2049 1500 0.0004 1980
390 0.]281 ]90 0.29J1 1190 0.2055 1590 0.0003 3990
400 0.]294 800 0.3695 1300 0.3060 1600 0.0003 2000
0.54 ac-ft
DESIGN
RUNOFF
(rfal
0.0001
5/8/06 3:37:36 pm Skillings Connolly, Inc page 7
THE HUTCH
SC 06099
_____________________________________________________________________
____ ________________________________________
DETAIL HYDROGRAPH SUMMP.RY
HYDROGRAPH No. 2
Peak runoff : 4 .8463 cfs Total Vol: 2.26 ac-ft
TIME DESIGN TIME OSSIGN TIME DESIGN TIME DESIGN TIME DESIGN
RUNOFF RUNOFF RUNOFF BONOFF RUNOFF
(min) Ic ES) Imin) (c Fs) (min) IcEe) (min) IcEe) (mint Icfel
10 410 1.356] 010 1. 09 J6 1210 0.8143 1610 0.0009
20 920 1,3660 820 1.0115 1230 O.BllJ 1630 0.0006
30 430 1.J006 830 0.9891 1230 0.8135 1630 0.0004
40 0.0099 490 2.2934 840 0.9]52 1290 0.81]2 1690 0.0003
50 0.0232 950 2.5939 050 0.999) 1250 0.8160 1650 0.0002
60 0.0526 460 J.2969 060 1.0386 1360 0.0155 3660 0.0002
]0 0.1032 4]0 4.2298 8]0 1.0665 13J0 0.0109 16]0 0.0001
eO 0.1]13 400 9.8963 880 1.0800 1280 0.81]] 3680
90 0.2350 490 9.6116 090 1.0939 1290 0.81]0 3690
100 0.2916 500 3.83 J5 900 1.1025 1300 0.8204 1]OO
110 0.3900 510 ].J]OS 910 1.1050 1310 0.8191 1J10
120 O.J028 520 3.0390 920 1.1106 1]20 0.8189 1]20
1J0 0.9395 530 2.]]92 9]0 1.1196 1]10 0.]893 - 1J30
190 0.4936 590 2.6369 990 1.1193 1]90 0.]929 1]40
150 0.5]91 550 2.J959 950 1.11]8 1350 O.J1J0 1]50
160 0.5]2] 560 3.3199 960 1.1206 1360 0.6909 1]60
1J0 0.6022 5]0 1.9418 9J0 1.0306 1]]O 0.6006 1]]0
380 0.6361 580 1.8J 94 980 O.BB9] 1300 0. 6J91 1]80
190 0.64]9 590 1.]]35 990 0.8016 3]90 0.6669 1]90
2OO 0.660] 600 1.]JJB 1000 0.]92] 1400 0.6651 1800
210 0.6]52 610 1.6031 1010 O.J090 1910 0.669) 1010
330 0.6E50 620 1.635] 1030 O.6BJ6 1920 0.6602 1020
230 0.6969 630 1.5910 1030 O.DOB 1930 0.6613 1030
240 0.]061 690 1.56]1 1040 O.B1B1 1990 0.6631 1890
250 0.]395 650 1.556] 1050 O.BJ28 1950 0.5396 3850
260 0.]]91 660 1.5513 1860 0.90]5 1960 0.3434 1860
280 0.8211 600 1.3955 1080 0.9940 1980 0.1421 3880
290 0.8329 690 1.3369 1090 0.9399 1990 0.0929 3890
300 O.B920 J00 1.J044 1100 0.001] 1500 0.0606 1900
310 0.9394 ]10 1.2811 1110 0.854] 1510 0.0900 1910
320 1.0909 ]20 1.26]2 1120 0. 998J 1520 0.0266 1920
330 1.190) ]30 1.2639 1130 0.0965 15]0 O.O1J8 19J0
390 1.2593 ]90 1.2566 3140 0.]5]2 1590 0.0120 1990
350 1.3090 ]50 1.3536 1150 0.]809 1550 0.0082 1950
]60 1.J9 J3 J60 1.2550 1160 0.]931 1560 0.0056 1960
]]0 1.J55] ]]0 3.2543 11]0 0.]991 15]0 0.00]8 19]0
300 1.3995 ]BO 1.3591 1100 0.80]1 1580 0.0026 1900
J90 1.J919 ]90 3.1988 1190 0.008] 1590 0.0018 1990
900 1.J955 800 1.1055 1200 O.B098 3600 0.0013 2000
5/8/06 3:37:36 pm Skillings Connolly, Inc page 6
THE HUTCH
SC 06099
_____________________________________________________________________
_____________________________________________________________________
DETAIL HYDROGRAPH SUMMARY
HYDROGRAPH No. 3
Peak runoff : 0 .3979 cfs Total Vol:
TIME nS52GN TIME DESIGN TIME DESIGN TIME n85IGN TIME
RUNOFF RUNOFF RDNO£F RNiD FF
Iminl (c Ps) (min) Iceol (min) (c esl Iminl (ciB) (min)
1a 410 o.ll lz elo 0.1003 1230 o.oeea 3610
20 420 0.1119 820 0.09]1 3220 0.0081 1620
30 430 0.1901 830 0.0959 1230 OABB3 1630
40 990 0.1055 G40 0.0945 1290 O.OBB9 1690
50 450 0.2192 850 0.0969 1250 0.0889 1650
60 960 0.2]25 860 0.101] 1260 0.0091 1660
]0 9]0 0.3492 0]0 0.1098 12]0 0.0896 36]0
BO 980 0.39]9 880 0.106] 1200 O.OB9> 3680
90 0.0002 990 0.3]96 890 0.1084 1290 O.OB9B 1690
300 0.001] 500 0.3068 900 0.1096 1300 0.0903 1]00
110 0.00]5 510 0.2665 910 0.1103 1310 0.090] 1]10
120 0.0064 520 0,2380 920 0.111) 1]20 0.0905 1"120
ll0 0.0101 530 0.21]1 930 0.1121 1330 0.00]4 1]30
190 0.0145 590 0.2058 990 0,1129 1340 0.0829 1]90
150 0.018> 550 0.1882 950 0.1132 1350 0.0]91 1]50
160 0.0226 560 0.1669 960 0.1139 1360 0.0]]0 1]60
1]0 0.0263 5>0 0.1590 9]0 0.1050 13]0 0.0]59 1]]0
100 0.0298 SBO 0.19]6 900 0.0908 1J80 0.0]53 1]00
190 0.0329 590 0.1942 990 0.0820 1390 0.0]96 1]90
200 0.0359 600 0.1920 3000 0.0]62 1900 0.0]45 1000
210 0.0386 610 0.1902 1010 0.0]29 1910 0.0]96 1810
220 0.0410 620 0.1368 3020 0.0]09 1420 0.0]42 1820
230 0.09]9 630 0.1353 1030 0.0]56 1930 0.0>99 3830
390 0,0956 690 0.139] 1040 0.0899 1990 0,0]96 3890
350 0.0990 650 0.1351 1050 0.0909 3450 0.0611 3850
260 0.053) 660 0.1]60 1060 0.094] 3960 0.0392 3060
2>0 0.0566 6]0 O.D15 30>0 O.o9]3 39]a 0.0259 36>0
280 0.0595 680 0.1230 1000 0.0990 1980 0.0165 1080
290 0.061] 690 0.1199 1090 0.09]3 1490 0.0100 1090
J00 0.06]] ]00 0.31]] 1100 0.0929 1500 0.00]2 1900
]30 0.0]26 ]10 0.3161 1110 0.0903 1510 0.0048 1910
]30 0.085] ]20 0.1156 1120 0.1005 1520 0.00]3 1920
IDO 0.099] ]30 0.1160 1130 0.0952 1530 0.0022 19]0
]90 0.1010 ]90 0.3162 1140 0.0806 1590 0.0015 1990
]50 0.1050 ]50 0.1166 1150 0.083] 1550 0.0010 1950
360 0.1099 ]60 0.11]5 1160 O.O B9] 1560 0.000] 1960
3]0 0.1105 ]]0 0.1180 11]0 O.OB56 15]0 0.0005 19]0
380 0.1098 ]80 O.11B6 1180 0.086] 1500 0.0003 1980
390 0.109] ]90 0.1138 1190 O.OB]0 1590 0.0002 1990
400 0.3102 800 0.1053 1200 0.08 ]J 1600 0.0002 2000
0.20 ac-ft
nes1GN
RUNOFF
Ic[3)
o.oool
5/8/06 3:37:36 pm Skillings Connolly, Inc page 9
THE HUTCH
SC 06099
__________________ ________________________________________
DETAIL HYDROGRAPH SUMMARY
HYDROGRAPH NO. 4
Peak runoff : 2 .1395 cfs Total Vol: 1.08 ac-ft
TIME DESI QI TSME -ESIGN TIME D&SIGN SIM6 DEEIGN TIME DESIGN
RUNOFF RUNOFF RDNOFF RNJO FF RUNOFF
fmin) Ices) (min) (cfs) (min) (c EaJ (min) lcf e) Imin) (c Eel
10 910 0.5358 B1O 0.5494 1210 0.9353 1610 0.0008
20 920 0.54]0 020 0.5309 1220 0.9353 1620 0.0006
30 930 0.699] 830 O.S1B9 1230 0.4354 1630 0.0009
90 0.0016 990 0.9194 090 0.5113 1290 0.93>9 1640 0.0003
$O 0.00>B 950 1.0810 050 0.5199 1250 0.93]2 1650 0.0002
60 0.01]6 960 1.390] 860 0.5410 1260 0.4J]1 1660 0.0002
>O 0.0395 9>O 1.02]] 0]0 0.5551 12]0 0.4391 16>0 0.0001
00 0.05]3 400 2.1395 000 0.56]0 1200 0.930] 1600
90 0.0>96 490 2.0029 990 0.5]04 1290 0.9386 1690
100 0.09>6 500 1.]]]9 900 O.SJ56 1300 0.9905 1>00
110 0.1190 510 1.5912 910 O.5 ]]9 1310 0.9901 1>30
120 0.1281 520 1.4538 920 0.5815 1320 0.9900 3>20
ll0 0.1953 5]0 1.34]2 930 0.5043 1330 0.9258 1]]0 -
190 0.1651 540 1.2932 940 O.SB49 1390 0.9029 1]90
150 0.1903 550 1.1815 950 0.58>5 1350 0.38>1 ll50
160 0.1916 560 1.0593 960 0.5895 ]J 6O 0.3]53 1]60
1]0 0.2019 5]0 0.9]]9 9>0 0.5466 ll]0 O.J699 1»0
180 0.2099 580 0.9248 980 0.4]]6 1300 O.J659 1>BO
190 0.2152 590 0.892> 990 0.4]25 1390 O.J611 1>90
200 0.2210 600 0.8]]1 1000 0.901) 1900 0.]600 1800
210 0.2258 610 0.8991 1010 O.JBD 1910 O,J593 1930
230 0.2291 620 0.9220 1020 0.3699 1420 0.35]1 1020
330 0.2]30 630 0.9056 1030 O.J 891 1430 0.]5]5 10]0
240 0.2]62 690 0.>99] 1040 0.4]10 1490' 0.]5>9 1940
250 0.245] 650 0.]B9> 3050 0.4506 1950 0.29>2 1850
260 0.2509 660 0.]B>8 1060 0.9]]0 3960 0.1982 1860
2]0 0.26>] 610 0.]601 SO>0 0.9099 la]a 0.1332 16]0
280 0.2]96 690 0.]156 3080 0.49]9 1480 0.0901 1880
290 0.2]06 690 0.60>9 3090 0.9899 1490 0.0613 1090
300 .0.281] >00 0.6]12 1100 0.969] 1500 0.0420 1900
330 0.315> ]10 0.6596 1110 0.4561 1510 0.0209 1910
320 0.3>O$ ]20 0.6525 1120 0.5010 1520 0.0200 1920
]JO 0.9109 ]30 0.6501 I1J0 0.9 J>6 15]0 0,0139 1930
340 0.9916 ]40 0.69>5 1190 0.409] 1540 0.009] 1940
J50 0.46]4 ]50 0.646] 1150 0.9196 1550 0.0069 1950
360 0.9900 ]60 0.69>8 3160 0.9292 1560 0.009] 1960
]>0 0.5019 >]0 0.69]8 11]0 0.92>3 15]0 0.0033 19>0
]90 0.5066 ]00 0.6904 1180 0.9]12 1580 0.0024 1980
J90 O.Sll9 ]90 0.622] 1190 0.9321 1590 0.001] 1990
400 0.5336 800 0.5]81 1200 0.4]29 1600 0.0012 2000
5/8/06 3:37:36 pm Skillings Connolly, Inc page 10
THE HUTCH
SC 06099
_____________________________________________________________________
DETAIL HYDROGRAPH SUMMARY
HYDROGRAPH No. 11
Peak runoff : 1 .1626 cfs Total Vol:
TIME DESIGN TIME DESIGN TIME D65IGN TI!ffi -£S IGN TIMR
RDNOFF RUNOFF RGNGFF RUNOFF
Imin) (cfa) (min) Icf s) Imin) (cfa) (min) (cfa) (min)
10 410 0.3291 810 0.2]55 1210 0,2059 1610
20 420 0.]]15 020 0.25]0 1220 0.2069 1620
3o aJO aa34z 830 o.z4ee 123a o.zo]4 1630
40 440 0.3918 090 0.2429 1290 0.20]3 1690
50 450 0.5204 850 0.2398 1250 0.2081 1650
60 960 0.6299 060 0.2929 1260 0.2085 1660
]0 9]0 0.]640 8]0 0.2538 12]0 0.2082 16]0
BO 480 0.9880 880 0.2632 3280 0.2090 1680
90 490 1.1626 090 0.26]6 1290 0,2093 1690
100 0,0004 500 1.1519 900 0.2]11 1300 0.2090 1]00
110 0.0028 510 0.9]11 910 0.2]39 1310 0.2098 1]10
120 0.008] 520 0.0165 920 0.2]50 1J20 0.2100 1]20
3]0 0.01]1 530 0.]319 930 0.2]62 1330 0.209] 1]30
190 0.02]5 540 0.6612 990 0.2]]0 1]90 0.2096 1]90
150 0.0402 550 0.6188 950 0.2]81 1]50 0.1928 1]50
160 0.0530 560 0.5]16 960 0.2]88 1]60 0.1035 1]60
1]0 0.0698 5]0 0.5099 9]0 0.2800 1]]0 0.3]]9 1]]0
100 0.0]61 580 0.4559 900 0.269) 1380 0.1]95 1]80
190 O.OB6] 590 0.4315 990 0.2291 1390 0.1]31 1]90
2OO 0.0962 fi00 0.9162 1000 0.201] 3900 0.3]19 1000
210 0.1051 610 0.90]8 1010 0.1065 1410 0.3]0] 1810
220 0.1136 620 0.3990 1020 0.1]60 1420 0.1]09 1820
230 0.1209 630 0.386] lO]0 0.1]1] 1430 0.1]02 1830
290 0.1200 690 0.3]80 3040 0.1]85 1940 0.1]01 1090
250 0.1340 650 0.3]36 1050 0.2003 1450 0.1]0] 1050
260 0.1938 660 0.3]15 1060 O.S1B] 1960 0,198) 1860
280 0.16A 680 0.3618 1000 0.2399 1480 0.0586 1880
290 0.1]59 690 0.3]9] 1090 0.2]84 1490 0.03]4 1890
]00 0.1832 ]00 0.3226 1100 0.2359 1500 0.0231 1900
330 0.1091 ]30 0.3198 1110 0.2254 1510 0.019] 1910
320 0.2090 ]20 0.3096 1120 0.2166 1520 0.0093 1920
330 0.2465 DO 0.3066 1130 0.2322 1530 0.0060 19]0
390 0.2]]9 ]90 0.3050 1190 0.2399 1590 0.0030 1940
350 0.29]0 ]50 0.3055 1150 0.1992 1550 0.0025 1950
J60 0.]131 ]60 O.JO51 1160 0.1919 1560 0.0016 1960
3]0 0.3246 ]]0 0.3060 11]0 0.2013 15]0 0.0011 39]0
300 0.3301 ]80 0.306] 1180 0.2016 1580 0.000] 1900
J90 0.]290 ]90 0.3069 1190 0.2095 1590 0.0005 1990
400 0.]2]9 800 0.291] 1200 0.2055 1fi 00 0.000] 2000
0.54 ac-ft
-ESIGN
RUNOFF
(cfa)
a.aoo2
o.aool
o.oom
5/8/06 3:37:36 pm Skillings Connolly, Inc page 11
THE HUTCH
SC 06099
DETAIL HYDROGRAPH SUMMARY
HYDAOGRAPH No. 12
Peak runoff : 1. 9670 cfs Total Vol:
TIME -ESIGN TIME DESIGN TIME DESIGN TIME OFS IGN TIME
RUNOFF RUNOFF RUNOFF RUNOFF
Iminl (c PS) Imin) (cfe) (min) (cfs) (minl (c FS) (min)
10 910 1 3442 810 1.96]0 1210 0.0095 1610
20 420 1.3535 820 1.96>0 3220 0.0130 1620
30 +30 1.3691 930 1.96]0 123a 0.9144 1630
90 440 1.5935 890 1.96]0 1290 O.Bll] 1640
50 0.00]] 950 1.96]0 850 1.96J0 1250 0.0160 1650
60 0.01>9 460 1.96J0 860 1.4993 1260 0.8168 1660
]0 0.0951 9]0 1.96>0 9]0 0.0696 12 J0 0.8154 16]0
90 0.0096 480 3.96>0 880 1.1199 1280 0.91>9 1600
90 0.1542 990 3.96>0 890 1.OSJ4 1290 0.0185 1690
100 0.2205 500 1.96]0 900 1.0900 1300 O.B1>0 1J00
110 0.2J05 510 1.96]0 910 1.090] 1310 0.8199 1>30
120 0.]296 40 1.96]0 920 1. ID5> 1J 20 0.8199 1>20
ll0 O.JJJ2 5]0 1.96]0 9]0 1.1005 1330 0.8109 1>30
140 0.9212 590 1.96J0 990 1.1191 1390 0.]98] 1>90
150 0.9>93 550 1.96>0 950 1.1195 1350 0.]592 1]50
160 0.5295 560 1.96>0 960 1.1165 1360 0.]183 1>60
1>0 0.5653 5>0 1.96>0 9>0 1.1201 13>0 0.6962 1JJ0
180 0.5959 SBO 1.96]0 900 1.0598 1380 0.6821 1>BO
190 0.6200 590 1.96]0 990 0,9249 1390 0.6>5] 1J 90
200 0.639] 600 1.96]0 1000 0.01>5 1400 0.6603 1000
210 0.6565 610 1.96>0 1010 0.>560 1910 0.6698 1810
220 0.6>20 620 1.96>0 1020 0.>151 1920 0.669] 1020
630 0.6029 6]0 1.96>0 1030 0.6923 14J0 0.6614 1930
290 0.6935 690 1.96]0 1090 0.]ls2 1940 0.6606 1940
250 0.]091 650 1.96>0 1050 0.]955 1450 0.6621 1060
260 0.]261 660 1.96>0 1060 0.86]2 3960 0,993 1860
2>O O.J643 6>0 1.96]0 SO>O 0.899e 19]0 0.3926 10>O
200 0.]954 680 1.96]0 1000 0.9253 1400 0.2929 1880
290 0.0162 690 1.96J0 1090 0.9909 1490 0.159] ]090
300 0.8300 >00 1.96]0 1100 0.9322 1500 0.102] 1900
310 0.0]90 ]10 3.96>0 1110 0.0920 1510 0.06>3 3910
320 0.9088 >20 1.96]0 1120 0.0589 1520 0.0992 1920
330 1.0530 ]30 1.96>0 1ll0 0.916) 1530 0.0299 19]0
340 3.1 J20 ]90 1.96]0 1390 0.9295 1540 0.019] 1940
350 1.2939 ]50 1.96>0 1150 0.>921 1550 0.013] 1950
360 1.2905 >60 1.96>0 1160 0 A609 1560 0.0090 3960
3]0 1.J386 J]0 1.96>0 11J0 0.]956 15J0 0.0061 19]0
]00 1.J 55] >BO 1.96]0 1180 O.J956 1500 0.0092 1900
]90 1.39>0 ]90 1.96>0 1190 0.8058 1590 0.0029 1990
900 1.]912 800 1.96>0 1200 0.000> 1600 0.0020 2000
2.26 ac-ft
DESIGN
RUNOFF
I cfel
0.0019
o.aalo
o.oa9>
o.a6as
o.oao3
0.0002
0.0002
0.0001
5/8/06 3:37:36 pm Skillings Connolly, Inc page 12
THE HUTCH
SC 06099
______________________________________
__________________________________________________________________
DETAIL HYDROGRAPH SUMMARY
HYDROGRAPH No.
Peak runoff:
TIME -EBI GN TIME
RUNOFF
(min) (cfa) (min)
410
30
20 920
30 930
90 990
50 950
60 960
]0 4]0
80 980
90 990
100 0.0001 500
110 0.0009 510
lzo o.oB29 s2o
1]0 0.005] 530
190 0.0092 s90
lsB a.an9 sm
160 0.01]] s60
v9 o.ozv no
300 0.0255 500
190 0.0290 590
200 0,0323 600
uB a.m sz 618
220 0.0300 620
no o.o4os 630
290 0.0928 690
250 0.0451 650
260 0.0981 660
280 0.0569 680
290 O.OSBe 690
300 0.061] 200
]30 0.0632 ]10
RO 0.0699 230
330 O.O B2s IDO
390 0.0930 ]90
350 0.0996 250
360 0.1092 ]60
no oaoe6 no
]80 0.1104 ]00
390 0.1100 ]90
400 0.1092 000
13
0
-ESI GN
RUNOFF
f=£a)
0.1101
0.1109
0.1118
0.1311
0.1]91
0,2090
0.2556
0 .3306
O.J089
0.]853
a .3 z4e
O.z231
0.2940
0.2214
0.2029
0.1931
0.1]1]
0.1562
0.1489
0.1948
O.lUO
0.1910
0.13]6
0.13s5
0.1398
0.3399
0.1230
0.125]
a.lzal
0.11]]
0 .136J
O.llsi
0,1158
0.1162
0.1166
o.un
0.11]9
O.11Bs
0.1159
3889
T I103
Imro)
810
ezo
830
840
850
860
B]0
080
890
908
910
9zo
930
940
950
960
920
980
990
1000
1010
1030
1030
1040
1050
1060
lO BO
1090
aloo
1110
1120
11]0
3198
1160
1160
11]a
11Bo
1190
1200
cfs
DESIGN
RUNOFF
Icfa)
0.10]s
o.lolo
0.09]8
a.o9n
0.099"1
0.0960
0.1004
0.109]
0.106]
o.loeB
0.1099
8.110z
0.1110
0.1119
0,1129
0.1130
0.1138
0.10]9
0.0991
O .O B]6
0.0]]5
0.0 ]3s
0.0]13
0.0]39
0.0825
0.0890
0.0968
a.o982
0.0980
0.0991
0.090]
0.09]0
0.0981
0.0893
0.0811
O.oeso
O .OB S2
0.0866
o.oe]o
Tot
TIME
Imin)
1210
lzzo
1230
1290
1250
1260
12]0
3280
1290
1300
1310
13zo
ll30
ll90
Ds0
1360
13]0
1380
1390
1400
1410
1920
1930
1990
1450
1460
1980
1990
lsaa
1510
1520
15J0
3540
1550
1660
lsio
1500
3690
16oa
al Vol:
-ESIGN TIME
RUNOFF
Ic£s) Imin
O.OB4J 1610
0.00]8 1620
0.0802 1630
0.0882 3640
0,088] 1660
0.0090 1660
O.OB 90 16]0
0.0895 1680
0.009] 1690
0.009] 1]00
0.0902 1]10
o.o9a9 nzo
0.0904 1]30
O.OB89 1]90
0.003] 1]50
0.0]99 1]60
0.02]5 1]]0
o.oi61 v0a
0.0]55 1]90
0.0298 1800
0.0295 1010
0.0296 102a
0.0 ]9J 3830
0.0]9J 184C
0.0296 185L
0.0659 186[
0.049) 16 ](
0.02]9 10 B(
0.0185 1B 9[
0.0120 190(
0.0080 191[
0.0053 192(
0.0035 193[
0.0024 194!
0.0016 195f
0.0011 196(
0.0008 19 ]{
a.ams 19e{
0.0009 1991
B.BBO3 zm{
0.20 ac-ft
DSS IGN
RUNOFF
(cf e)
0,0002
O.oool
5/8/06 3:37:36 pm Skillings Connolly, Inc page 13
THE HUTCH
SC 06099
DETAIL HYDROGRAPH SUMMARY
HYDROGRAPH No.
Peak runoff:
TIME DESIGN TIME
RUNOFF
(minl (cfa) (min)
30 410
20 920
30 430
90 940
s0 0.0011 450
60 0.0060 960
t0 0.0151 4]0
00 O.OJ00 980
90 0.0516 490
100 0.0]30 s00
110 0.0932 510
lzo a.uo3 szo
130 0.1248 sJ0
140 0.1409 590
150 0.1603 550
160 0.1]J1 560
1]0 0.1091 5]0
180 0.1991 580
190 0.20]] 590
200 0.2190 600
210 0.2196 610
220 0.2298 620
230 0.2209 630
290 0.2320 690
250 0.2355 650
260 0.2929 660
2]0 0.255') 6]O
280 0.2661 680
290 0.2]30 690
300 0.2]]9 ]00
310 0.2009 ]30
]20 O.JO50 ]20
330 0.3566 ]30
390 0.402s ]40
3so 9.4343 ]so
360 0.4616 ]60
3]0 0.4090 ]]0
]80 0.9999 ]00
390 0.5058 ]90
400 0.5119 000
14
0
DEEIGN
RUNOFF
(cfa)
0.5212
0.92"1
O.s995
0.6939
0.0610
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
9260
TIME
(mm)
910
020
030
840
960
8]0
080
090
900
910
920
9]0
990
950
960
9]0
900
990
1000
lalo
1020
1030
1040
3050
1060
1000
1090
1300
3110
l lzo
11]0
1190
use
1360
11]0
1190
1190
1200
cfs
DESIGN
RUNOFF
(cfa)
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0.9260
0,9260
a.sz9s
o.se o3
0.5]09
0.5]90
O.s]99
0.5090
O.s899
0.506]
0.5091
0.5606
0.4940
0.9409
0.9089
0.3059
O.3]2s
0.3019
0.4201
0.4536
0.9869
0.9960
0.9931
0.9]40
0.9584
0.9063
0.9910
o.a26e
0.9103
0.4260
0.925"1
0.4305
0.9321
TOt
TIME
ImIN
1230
1220
1D0
1290
1250
1260
12]0
1290
1290
1300
1310
1]20
1330
1390
13 s0
1]60
13"10
1380
1390
1900
1910
1420
1930
1990
1450
1960
1980
1990
1500
1510
l sao
15]0
1 s90
lsso
1560
15]0
1500
1s90
1600
al vol:
D65I Q1 TItS
RUNOFF
lcfa) Irvin
0 9326 1610
0.4396 1620
0.9355 1610
0.4353 1690
0 .9J6B 1650
0 .9]]s 1660
0.93]0 16]0
0.4395 1600
0.4390 3690
0.4385 1]00
0.9]99 1]10
0.9904 1]20
0.9399 1430
0.9304 1]90
0.908] 1]s0
0.3900 1]60
O.J]81 1]]0
0.]]03 1]00
0. 3fi 64 1]90
0.3621 1900
0.3600 1810
0.3596 382C
O.J5]B 10JC
O.JS]2 184L
0.35]9 105C
0.316] 1861
0.1452 1BB[
0.0996 189[
0.06]1 190[
0.0961 191(
0.0316 192(
0.0219 193(
0.0152 3941
o. om6 19so
0.00]9 1961
0.0052 19J(
0,00]6 1901
0.0026 1991
0.0018 2001
1.08 ac-ft
DESIGN
RUNOFF
Icfal
0.0013
0.0009
0.0006
0.0009
0.0003
6.ooaz
0.0002
9.0001
5/8/06 3:37:36 pm Skillings Connolly, Inc page 14
THE HUTCH
SC 06099
_____________________________
____________________________________________________________
STAGE STORAGE TABLE
CUSTOM STORAGE ID No. S1
Description: ROCK GALLERY
STAG6 a----SROPAGE----> STAGE < ----6TOEAGE----> STAGE <----OTOPAGS----> BTAG6 ~----STORAGE---->
(f U --- cf--- - -ACFC )f [ ) - --cf-- - -Ao-FC (f [) -- -cf--- - -AC-F[- (f [) --- cf--- --AC FC
330. 00 0.0000 0.0000 331. 10 3886 0.0]08 3J2. 20 6ll1 0.19ll 333. 30 925] 0.2125
3]0. 10 200.50 0.0064 331 .20 3366 0.0]]3 332. J0 6952 0.1981 333. 40 953] 0.2109
330. 20 561.00 0.0129 331 .30 ]64] O.O B3] 332. 90 6]32 0.1595 333. 50 9818 0.2259
3JO. J0 841.50 0.019] 331 .40 392] 0.0902 332. 50 ]013 0.1610 33]. 60 10098 0.2]18
3]O. gO 1122 0.0258 331 .50 9200 0.0966 3]2. 60 ]29J 0.16]4 ]D. ]0 10319 0.230]
330. 50 1903 0.0322 ]31 .60 9908 0.1030 332. >0 95]9 0.1]39 ]D. BO 10659 0.249]
]30. 60 1683 0.0386 331 .]0 9]69 0.1095 332. BO ]859 O.1B 0] J33. 90 10990 0.2511
330. 90 1969 0.0951 331 .80 5049 0.1159 3]2. 90 01]5 0.186] 339. 00 11220 0.25]6
330. 80 2249 0.0515 3]1 .90 930 0.1223 333. 00 8915 0.19]2
330. 90 245 0.0500 J32 .00 56ID 0.1200 33]. 10 0696 0.1996
331. 00 2005 0.0649 332 .30 SB91 0.1352 333. 20 09]6 0.2061
5/8/06 3:37:36 pm Skillings Connolly, Inc page 15
THE HUTCH
SC 06099
STAGE STORAGE TABLE
CUSTOM STORAGE ID No. S2
Description: ROCK GALLERY
STAGE a----STORAGE----a BTAGE a---- STOPAGE----> GTAGE a----STOPAGE----a STAGE a----STORAGE---->
(E C) ---cf--- - -AC-F[- If[) ---cf --- -AC-FC If [) --- cf--- --AC FO If t) --- cf--- --AC-FC-
J 33 .00 0.0000 0.0000 D4. 30 1452 0.0333 3]5. 20 2909 0.066] 336. 30 4356 0.1000
333 .10 132.00 0.0030 3]4. 20 1509 0.0364 335. 30 30J6 0.069] 336. 90 4408 0.1030
333 .20 264.00 0.0063 ]]9 .30 1]16 0.0399 335. 40 3360 0.0]2"/ 336. 50 9620 0.1061
333 .30 J96.00 0.0091 334. 90 1898 0.0929 335. 50 ]]00 0.0]50 336. 60 4"!52 0,1091
3]] .q0 528.00 0.0131 ]]4. 50 1980 0.0955 335. 60 ]9J2 O.OpBB 336. ]0 4089 0.1121
333 .50 660.00 0.0152 ]]9. 60 2112 0.0985 335. ]0 3569 O.OB1B 336. 00 5016 0.1152
]33 .60 ]92.00 0.0182 339. ]0 2299 0.0515 335. 80 ]696 0.0848 336. 90 5198 0.1182
333 .]0 939.00 0.0212 339 .80 2]]6 0.0595 ]]5. 90 ]020 0.00"19 33]. 00 5280 0.1212
3]] .BO 1056 0.0242 339 .90 2508 0.05]6 JJ6. 00 ]960 0.0909
333 .90 1188 0.0293 335 .00 2690 0.0606 J]6. 10 9092 0.09]9
334 .00 1J20 0.0]03 335 .10 2]]2 0.06J6 J]6. 20 9224 0.0970
5/8/06 3:37:36 pm Skillings Connolly, Inc page 16
THE HUTCH
SC 06099
STAGE DISCHARGE TABLE
DISCHARGE LIST ID No. D1
Description: INFILTRATION
STAGE o--DISCHARGE--- a STAG6 <--DISCHARGE---a STAGE a--OISCHARGS---~ ETAGE c--DISCNARGS--->
(f [) -cf~ (fe ) -cfs fEq -cfo (f t) -cfs
330. 00 1.96]0 JJ1. 30 1.96]0 332. 20 1.96]0 333. 30 3.96]0
330. 10 1.96]0 331. 20 1.96]0 332 .30 1.96]0 333. 90 1.96]0
330. 20 1.96]0 331. ]0 1.96]0 332 .90 1.96]0 3]3. 50 1.96]0
330. 30 1.96]0 331. 40 1.96]0 332. 50 1.96]0 3J3. 60 1.96]0
3J0. 90 1.96]0 J31. 50 1.96]0 332 .60 1.96]0 333. ]0 1.96]0
330. 50 1.96]0 JJ1. 60 1.96]0 332 .]0 1.96]0 333. 80 1.96]0
3J0. 60 1.96]0 331. ]0 1.96]0 3J2 .BO 1.96]0 ]D . 90 1. 96 ]O
330. ]0 1.96]0 331 .80 1.96]0 332 .90 1.96]0 JJ9. 00 1.96]0
330. 80 1. 96 ]O 331 .90 1.96]0 333 .00 1.96]0
]]0. 90 1.96]0 332 .00 1.96]0 333 .10 1.96]0
]31. 00 1.96]0 332 .10 y.96 ]0 33J .2O 1.96]0
5/8/06 3:37:36 pm Skillings Connolly, Inc page 17
THE HUTCH
SC 06099
STAGE DISCHARGE TABLE
DISCHARGE LIST ID No. D2
Description: INFILTRATION
STAGS c--DISCHARGE---~ STAGE c--DISCHARGE---a STAGE c--DISCHARGE---> STAGE c--DISCHARGE---a
(f [ ) -cfs (f q -cfs (f[) -cfs (f[) -cfs
333. 00 0.9260 ]39. 10 0.9260 -5. 20 0.9260 336. ]0 0.9260
]JJ. 30 0.9260 334. 20 0.9260 ]35. 30 0.9260 JJ6. 90 0.9260
]]3. 20 0.9260 339. ]0 0.9260 ]35 .90 0.9260 ]]6. 50 0.9260
ID3. J0 0.9260 3]4. 90 0.9260 335. 50 0.9260 336. 60 0.9260
J33. g0 0.9260 JJ4. 50 0.9260 335 .60 0.92fi0 336. ")0 0.9260
333. 50 0.9260 3]9. 60 0.9260 339 .70 0.9260 336. 80 0.9260
333 .60 0.9260 ID9. ]0 0.9260 3]5 .00 0.9260 3J6 . 90 0.9260
3]J .]0 0.9260 3]9. 00 0.9260 3]5 .90 0.9260 JJ] .00 0.9260
3JJ .00 0.9260 339. 90 0.9260 JJ6 .00 0.9260
JJJ .90 0.9260 335. 00 0.9260 ]]6 .10 0.9260
3]9 .00 0.9260 335. 10 0.9260 2]6 .20 0.9260
5/8/06 3:37:37 pm Skillings Connolly, Inc page 18
THE HUTCH
SC 06099
LEVEL POOL TABLE SUMMARY
M1LITCH INFLJW -STO- -D IS- <-PEAR-> OUTFIAW STORAGE
c- -------06E CRI PLION------ --~ {c f e) (cf ~) --i d- --i tl- c-6 iAGEO id Icf e) VOL (cf)
A 6 MO STORM EVEN'C O 00 1 19 SS D1 IDO 10 11 1.16 280 50 c£
A 100 YA STOEM EVENT ...... ... 0.00 4.05 S1 DI ]]].60 12 1.9] 10096 .]9 cf
B 6 MJ BTORM EVENI ........ ... 0.00 0.90 52 D2 ]3].10 13 0.]9 132 .00 cf
B 100 YR ETORM EVQI'f ...... ... 0.00 2.14 E2 -2 3]6.36 19 0.93 99J2 .91 c£
APPENDIX C -Supporting Data
Soils Data
SCS Soil Description
SHILLINGS CONNOLLY, INC. 7 Velm Property Development LLC
Hydrology Report
Thurston Co'.: ntv. Washinc;on
Inciuded areas make up about 10 percent of the total
acreage.
Permeabllny is moderately rapid in the Spana soil
A ~allable water czpacny is moderate. Effective roof g
de th is 20 to 40 Inches- A seasonal high water 1 le is
at a depth of about 12 to 36 Inches from Novem r to
April. Runoff is slow, and the hazard of water er sion is
slight.
Mos areas are used as hayland and pastu .This
unit is s fled to hay and pasture. The main li nations
are the s asonal high water table and the oderate
available ater capacity. Proper stocking r tes, pasture
rotation, an restricted grazing during we periods help
to keep the asture in good condition a protect the
soiNrom erns n. Rotation grazing help to maintain the
quality of fora .Periodic mowing het s to maintain
uniform growth, iscourages selectiv grazing, and
controls weeds. most years irriga on is needed for
maximum product n. Sprinkler irri lion is the best
method of applying water. The a unt of water applied
should be sufficient wet the ro t zone but small
enough to minimize t e leachin of plant nutrients.
A few areas are us as w Bland. On the basis of a
100-year site curve, th esti led site index for
Douglas-fir is 144. On th b sis of a 50-year site curve,
it is 110. The estimated g ~ah rate of an unmanaged,
even-aced stand of Douel -#Ir Is 150 cubic feet per
acre per year at 60 year o age.
The main iimitation a ecti the harvesting of timber
is the muddiness taus d by s asonal wetness. Use of
wheeled and tracked quipmen when the soil is wet
results in ruts ands compacti n. Unsurfaced roads
and skid trails are s ft and can b impassable when
wet. Logging road require suitabl surfacing material
for year-round us .Rounded pebbl sand cobbles for
road consiructio are re$dily availab on this unit. The
seasonal high Ater fable limits the u e of equipment to
dry periods. D' to rbance of the protect e layer of duff
can be mini zed by the careful use of heeled and
tracked equi ment.
Seedlin establishment is the main con ern in the
productio of timber. Reforestation can be
accompli hed by planting Douglas-fir seedli s. It the
stand I hides seed trees, natural reforestati by red
alder curs periodically in culover areas. The easonal
high Ater table inhibits root respiration and ih results
ins e seedling mortality. When openings are ode in
the anopy, invading brushy plants can prevent t
es ablishmenl of planted Douglas-fir seedlings.
Common forest understory plants are cascade
regon-grape, salal, vine maple, western brackenfer ,
and Oregon white oak
89
nis ma ass Illw
110-Spanaway gravelly sandy loam, 0 to 3
percent slopes. This very deep, somewhat excessively
drained soil is on terraces. It formed in glacial outwash
and volcanic ash. The native vegetation is mainly
grasses, ferns. and a few conifers. Elevation is 100 to
400 feet. The average annual precipitation is 45 to 55
inches, the average annual air temperature is about 51
degrees F, and the average frost-free period is 150 to
200 days.
Typically, the surface layer is black gravelly sandy
loam about 15 inches thick. The subsoil is dark
yellowish brown very gravelly loam about 5 inches thick.
The substratum to a depth of 60 inches or more is dark
yellowish brown extremely gravelly sand.
Included in this unit are small areas of Alderwood
soils on till plains; Everett, Indianola, and Nisqually soils
on outwash terraces; and Spana soils in depressions.
Also included are small areas of Spanaway soils that
have a stony sandy loam surface layer and small areas
of Spanaway gravelly sandy loam that have slopes of 3
to 15 percent. Included areas make up about 20
percent of the total acreage. -
Permeability is moderately rapid in the subsoil of the
Spanaway soil and very rapid in the substratum.
Available water capacity is low. Effective rooting depth
is 60 inches or more. Runoff is slow, and the hazard of
water erosion is slight.
This unit is used mainly as hayland, pasture, or
cropland, as a site for homes, or as a source of gravel.
It is also used as woodland.
The main limitation affecting hay and pasture is the
low available water capacity. Proper grazing practices,
weed control, and fertilizer are needed to ensure
maximum quality of forage. Rotation grazing helps to
maintain the quality of forage. Periodic mowing helps [o
maintain uniform growth, discourages selective grazing,
antl controls weeds. Animal manure can be applied
periodically during the growing season. Areas that
receive heavy applications should be harrowed at least
once a year. In summer, irrigation is needed for
maximum production of most forage crops. Sprinkler
irrigation is the best method of applying water. The
amount of water applied should be sufficient [o wet the
root zone but small enough to minimize the leaching of
plant nutrients.
This unit is suited to crops. Wheat, oats,
strawberries, raspberries, blackberries, and sweet corn
are commonly grown. The main limitation is the low
available water capacity. In summer, irrigation is
needed for maximum production of most crops.
90
Sprinklers can be used, but a slow application rate is
needed to minimize runoff. The amount of water applied
should be sufficient to wet the root zone but small
enough to minimize the leaching of plant nutrients. The
application rate should be adjusted to the available
water capacity, the water intake rate, and the needs of
the crop: Animal manure can be applied periodically
during the growing season. Areas that receive heavy
applications should be harrowed at least once a year.
This unit is well suited to homesites. Pebbles and
cobbles should he removed, particularly in areas used
for lawns. In summer, irrigation is needed for lawn
grasses. shrubs, vines, shade trees, and ornamental
trees. Mulch, fertilizer, and Irrigation are needed to
establish lawn grasses and other small-seeded plants.
The main limitation affecting septic tank absorption
fields is a poor filtering capacity, If the density of
housing is moderate or high, community sewage
systems are needed to prevent the contamination of
wat=_r supplies caused by seepage from onsite sewage
disposal systems. Cutbanks are not stable and are
subject to sloughing.
Douglas-fir is the main woodland species on this unit.
Among the trees of limited extent are Oregon white oak,
lodgepole pine. and red alder. Douglas-fir and Scotch
pine are drown on Christmas tree pL-ntations. On the
basis of a 100-year sae curve, the mean site index for
Douclas-fir Is 140- On the bads of a 50-year site curve,
it is 108. The hiohest average growth rateof an
unmanaged, even-aged stand of Douglas-fir is 145
cubic feet per acre per year at 65 years of age.
This soil is suited to year-round logging. Unsurfaced
roads and skid trails are slippery when wet. Logging
roads require suitable surtacing material for year-round
use. Rounded pebbles and cobbles for road
construction are readily available on this unit.
Disturbance of the protective layer of duff can be
minimized by the careful use of wheeled and tracked
equipment.
Seedling establishment and seetlling mortality are the
main concerns in the production of timber. Reforestation
can be accomplished by planting Douglas-fir seedlings.
If the stand includes seed trees, natural reforestation by
Douglas-fir, Oregon white oak, and lodgepole pine
occurs periodically in cutover areas. Droughtiness in the
surface layer reduces the seedling survival rate. When
openings are made in the canopy. invatling brushy
plants can delay the establishment of planted Douglas-
fir seedlings.
Common forest understory plants are cascade
Oregon-grape, salal, western brackenfern, western
swordfern, Indian plum, and Scotch-broom.
Soil Survey
This map unit is in capability su bclzss IVs.
111-Spanaway gravelly sandy loam, 3 to 15
p rcent slopes. This very deep, somewhat excessiv
dr ned soil is on terraces. It formed in glacial outw h
and volcanic ash. The native vegetation is mainly
gras s, ferns, and a few conifers. Elevation is 10 [o
400 f t. The average annual precipitation is 45 55
inches, the average annual air temperature is a out 51
degrees F, and the average frost-free period is 150 to
200 days
Typical ,the surface layer is black gravel sandy
loam about 15 inches thick. The subsoil is ark
yellowish br wn very gravelly sandy loam bout 5
inches thick. he substratum to a depth 60 inches or
more is dark y Ilowish brown extremely ravelly sand.
Included in t is unit are small areas f Aldenvood
soils on till plain and Everett, Indian a, and Nisqually
soils on terraces. Iso included are all areas of
Spanaway soils th t have a stony s ndy loam surface
layer and small are s of Spanawa gravelly sandy loam
that have slopes of to 3 percen .Included areas make
up about 20 percent [he total creage.
Permeability is mod rately r id in the subsoil of the
Spanaway soil and ve rapid n [he substratum.
Available water capacity ~s to .Effective rooting depth
is 60 inches or more. Ru is slow, and the hazard of
water erosion is slight.
This unit is used main) hayland or pasture, as a
site for homes, or as a s urc of gravel. It is also used
as woodland.
The main limitation ffecling hay and pasture is the
low available water c pacify dur g [he growing season.
Proper grazing prat ces, weed c nVOI, and fertilizer are
needed to ensure aximum qualit of forage. Rotation
grazing helps to aintain the quoit of forage. Periodic
mowing helps to aintain uniform g wth, discourages
selective grazin ,and controls weed Animal manure
can be applie periodically during the rowing season.
Areas that re eive heavy applications s ould be
harrowed at east once a year. In summ r, irrigation is
needed for aximum production of most rage crops.
Sprinkler ~ rigation is the best method of a plying water.
The am nt of water applied should be su -cient to wet
the rod zone but small enough to minimize e leaching
of pia nutrients.
Th~ unit is suited to homesites. The main li nation
is (h slope. Cutbanks are not stable and are s bled to
slo ghing. A plant cover can be established and
m intained through proper fertilizing, seeding. m thing,
d shaping of the slopes. Pebbles and cobbles s ould
e removed, particularly in areas used for lawns. In
Thurston County. Washington
sr, Irrigation is needed for lawn grasses, shrubsJJJJ
shade trees, and ornamental trees. Mulch,
¢r, and irrigation are needed to establish law
s and other small-seeded plants. Topsoil ca be
tied and used to reclaim areas disturbed d nog
The gin limitation affecting septic tank ohs rption
fields is poor filtering capacity in the su bstr um. If the
density of ousing is moderate or high, tom unity
sewage sy ems are needed to prevent th
contaminatio of water supplies caused b seepage
from onsite s age disposal systems. T e slope
hinders the ins Ration of the absorptio fields.
Absorption lines hould be installed o the contour.
Douglas-fir is t main woodland pecies on this unit.
Among the trees o limited extent e Oregon white oak,
lodgepole pine, and ed alder. Do gigs-fir and Scotch
pine are grown on Ch istmas tre plantations. On the
basis of a 100-year sit curve, a mean site index for
Douglas-fir is 140. On t ba of a 50-year site curve,
it is 108. The highest ave g growth rate of an
unmanaged, even-aged st dot Douglas-fir is 145
cubic feet per acre per ye r t 65 years of age.
This soil is suited toy ar-r and logging. Unsurfaced
roads and skid trails ar slippe when wet. Logging
roads require suitable urfacing aterlal for year-round
use. Rounded pehbl and cobbl s for road -
construction are re ily available this unit.
Disturbance of the rotective layer duff can be
minimized by the areful use o' whe ed and tracked
equipment.
Seedling es' blishment and seedling ortality are the
main tooter in the production of timbe Reforestation
can be act pushed by planting Douglas- it seedlings.
If the stan includes seed trees, natural ref restation of
cutover a eas by Oregon white oak and lodg pole pine
occurs i frequently. Droughtiness in the surta layer
reduce the seedling survival rate. When openi s are
made in the canopy, invading brushy plants can elay
the stablishment of planted Douglas-fir seedlings.
ommon forest understory plants are cascade
O egon-grape, salal, western brackenfern, western
ordfern, Indian plum, and Scotch-broom.
This map unit is in capability subclass IVs.
112-Spanaway stony sandy loam, 0 to 3 percent
slopes. This very deep, somewhat excessively drained
soil is on terraces. It formed in glacial ou[wash and
volcanic ash. The native vegetation is mainly grasses,
ferns, and a few conifers. Elevation is 200 to 400 fee[.
The average annual precipitation is 40 to 50 inches, the
average annual air temperature is about 51 degrees F,
and the average frost-free period is 150 to 200 days.
Typically, the surface layer is black stony sandy loam
about i6 inches thick. The subsoil is very dark brown
gravelly sandy loam about 6 inches thick. The
substratum to a depth of 60 inches or more is grayish
brown extremely gravelly sand.
Includetl in this unit are small areas of Alderwood
soils on till plains, Baldhlll soils on terminal moraines,
and Everett. Indianola, and Nisqually soils on terraces.
Also included are small areas of Spanaway soils that
have a gravelly sandy loam surface layer and small
areas of Spanaway stony sandy loam that have slopes
of 3 to 16 percent. Included areas make up about 16
percent of the total acreage.
Permeability is moderately rapid in the subsoil of the
Spanaway soil and very rapid in the substratum.
Available water capacity is low. Effective rooting depth
is 60 inches or more. Runoff is slow, and the hazard of
water erosion is slight.
This unit is used mainly for hayland, pasture, or
homesites. The main limitations affecting hay and
pasture are the low available water capacity and the
stones on the surface. Proper grazing practices, weed
control, and fertilizer are needed to ensure maximum
quality of forage. Rotation grazing helps to maintain the
quality of the forage. Because of the surface stones,
spreading animal manure, mowing, and seeding are
difficult In summer, irrigation is needed for maximum
production of most forage crops. Sprinkler irrigation is
the best method of applying water. The amount of water
applied should be sufficient to wet the root zone but
small enough to minimize the leaching of plant
nutrients.
This unit is well suited [o homesites. Pebhles,
cobbles, and stones should be removed, particularly in
areas used for lawns. In summer, irrigation is needed
for lawn grasses, shrubs, vines, shade trees, and
ornamental trees. Mulch, fertilizer, and irrigation are
needed to establish lawn grasses and other small-
seeded plants. Cutbanks are not stable and are subject
to sloughing.
The main limitation affecting septic tank ahsorpiion
fields is a poor filtering capacity in the substratum. If the
density of housing is moderate or high, community
sewage systems are needed to prevent the
contamination of water supplies caused by seepage
from onsite sewage disposal systems.
This map unit is in capability subclass IVs.
113- p stony sandy to percent
slopes. This very tl excessively drained
soil i ces. It formed in glacial ou d
t6a
Spanaway Series
The Spanaway series consists of very deep.
somewhat excessively drained sails on terraces. These
soils formed in glacial outwash and volcanic ash. Slope
is 0 to 16 percent. Elevation is 100 fo 400 feet. The
average annual precipitation is 40 to 0'S inches. the
average znnual air temperature Is about 51 degrees F,
and the average frost-free season is 150 to 200 days.
These soils are sandy-skeletal, mixed, mesic Andic
Xerumbrepts.
Typical pedon of Spanaway gravelly sandy loam, 0 to
3 percent slopes. 4 miles southeast of Lacey; about 250
feet west and 400 feet south of the northeast corner of
sea 25. T. 36 N.. R. 1 W.
A-0 to 15 Inches'. black (10VR 2/1) gravelly sandy
loam. very dark grayish brown (10YR 3/2) dry', weak
fine granular structure: loose, very friable, nonsticky
and nonplastic: many fine. medium, and coarse
roots: 25 percent pebbles: strongly acid: clear
smooth boundary.
Bw-15 to 20 inches; dark yellowish brown (10YR 3/4)
very gravelly sandy loam, light olive brown (2.SY
5:'4) dry: weak fine subangular blocky structure;
loose. very friable, nonsticky and nonplastic, many
fine, medium. and coarse roots', 55 percent pebbles:
metlium acid, clear smooth boundary.
C-20 to 60 inches', tlark yellowish brown (10VR 414)
extremely gravelly sand. yellowish brown (10YR
5;4) dry; single grained; loose; few fine roots; 80
percent pehbles, 10 percent cobbles; slightly acid.
The thickness of the solum ranges from 15 to 26
inches. The content of coarse fragments in the control
section ranges from 50 to~85 percent. The weighted
average texture of this section is very gravelly sand or
extremely gravelly sand. The umbric epipedon is 10 to
20 inches thick.
The A horizon has hue of 10YR or 7.SYR, value of 3
or 4 when dry, and chroma of 1 or 2 when moist or dry.
It is medium acid or strongly acid. The Bw horizon has
value of 4 or 6 when dry and 3 or 4 when moist. Il is
very gravelly sandy loam, very gravelly loam, or
extremely gravelly sandy loam. The C horizon has hue
of 10YR or 2.SV, value of 5 or 6 when dry and 4 or 5
when moist, and chroma of 3 or 4 when dry or moist. II
is extremely gravelly sand or extremely gravelly loamy
sand and is slightly acid or neutral.
Sulta
The Sultan se eo mo
Soil Survey
tlrained soils on flood plains. These soils formed it
ium. Slope is 0 to 3 percent. Elevation is 20 to 75
The average annual precipitation is 40 to 50
,s, the average annual air temperature is about 0
ees F, and the average frost-free season is 75 to
soils are fine-silty, mixed, nonacid,
200
Aquic erofluvents.
Typi I pedon of Sultan silt loam, 7 miles e t of
Lacey', a out 1,000 feet east and 1,975 feet rth of the
southwes corner of sec. 16, T. 18 N., R. 1
Ap-0 to 7 chest dark yellowish brown (1 YR 3/4) silt
loam, br wn (tOYR Sri) dry; moderat fine and
medium g anular structure; slightly h rd, very
friable. slag fly sticky and slightly pl slit; many fine,
medium, an coarse roots; many ry fine and fine
tubular pore ~ slightly acid; abrup smooth
boundary.
BA-7 to 20 inche ~ dark yellov
silt loam, brown (10YR 6/3)
medium subang ar blocky
very triable, slight sticky a
very fine, fine, and
and fine tubular par
boundary.
Bw1-20 to 25 inches; d~
grayish hrown (2.SY
prominent red (2.SYF
and medium suban
hard, very friable, is
common fine and e
and fine tuhular ore
boundary.
ash rown (10YR 4/4)
dr moderate fine and
ucture; silghtly hard,
d slightly plastic; many
roots; many very fine
Ily acid; clear wavy
mown (10YR 3/3) silt ;oam,
dry; common fine
mottles; moderate fine
locky structure; slightly
tacky and sllghUy plastic;
i ots; common very fine
gh y acid; gradual wavy
Bw2-25 [0 45 in es; dark brow (tOYR 4!3) silt loam,
light brownis gray (tOYR 6/2) ry; common
medium pro anent red (25YR 5 B) mottles;
moderate edium and coarse su angular blocky
structure; lightly hard, very friabl slightly sticky
and slag ly plastic; few very fine a fine roots; few
very fin and fine tubular pores; slag fly acid;
gradu wavy boundary.
C-45 to 0 inches; grayish brown (10YR /2) silt loam,
ligh gray (10YR 7/2) dry; common me 'um
pr inen[ dark brown (7.SYR 4/4) mottl ;massive;
sf Mly hard, very friable, slightly sticky a d slightly
astic; slightly acid.
~7he soils are slightly acid or neutral in the a
coon and range from slightly acid to strongly
low a depth of 40 inches. Mottles that have e
3 or more are at a depth of more than 20 in<
26o Soil Survey
THOLE 14.--ENGINEERING INDEX FROPERTIEE--Continued
Classification ,Frag- Percentage passing
Sail name and ,Depth', USDA texture '~Iments ~ sieve number-- ;Liquid ~ Plzs-
map symbol i Unified ~ AASHTO ~ > 3 i limit i ticity
',Snches~ 4 l0 40 200 index
In Pc[ Pct
, , ,
i
, - , , , , , ,
-~- 110, 833---------i 0-16iGravelly sandy ', GM, SM iA-1, A-2 i 0-5 ifs-85 'S0-]5 ,30-50 115-25 i 35-50 ~ NF-10
Spanaway i loam.
X15-20~Very gravelly ii GM ',A-1, A-2 ', 0-10 135-55 ,25-50 ,15-45 X10-35 ~ 35-50 ~ NP-10
loam, very
gravelly sandy
loam, extremely
gravelly sandy
1i loam.
20-60~Ex tremely iGP, GW iA-1 110-25 i2f-35 ,20-30 110-20 ~ 0-5 --- NP
gravelly sand,
extremely
gravelly loamy
sand.
-~ 112, 333---------i 0-16~Stony sandy loam ,SM ,A-2 ' 5-20 i]0-90 ,60-BO ,40-50 i25-35 i 35-SD ~ NP-10
Spanaway 116-22 ,Very gravelly iGM ,A-1, A-2 ~ 0-10 ,35-55 i25-50 120-40 ,10-30 i 35-50 i NP-10
loam, very
gravelly sandy
loam, extremely
gravelly sandy
loam.
122-60~Extremely ,GP, GW iA-1 110-25 i25-35 '20-30 110-20 i 0-5 --- NP
~ gravelly sand,
extremely
gravelly loamy
sand.
, , , i
,
, , , , ,
119*: , ~ , i , , ~
Spanaway--------~ 0-15~G: avelly sandy ,GM, SM ,A-1, A-2 i 0-5 153-85 ,50-]5 130-50115-25 i 35-50 ~ NF-30
loam.
115-20~Very gravelly 'GM ,A-1, A-2 i 0-10 ,35-55 '25-50 X15-46 ,10-35 ~ 35-50 ~ NP-10
loam, very
gravelly sandy
loam, eztremely
gravelly sandy
loam.
X20-60~EZ treme ly ,GP, GW iA-1 ,30-25 i25-36 ,20-30 110-20 i 0-5 --- NR
gravelly sand,
~• extremely
gravelly loamy
~ sa d.
, r i , i , i ,
Nisqually-------i 0-5 ,Loamy Eine sand ,SM iA-2 i 0 i 100 ~ 100 150-00 115-30 i --- i NP
~ 5-31iLOamy sand, loamyiSM iA-2 0 ~ lOD i 100 ,60-80 ,20-3D , --- NP
~ fine sand.
31-60 iLoamy Eine sand, ~iSP-SM, SM ,A-3, A-2 i 0 i 100 i 100 ~i66-05 i 5-20 , --- NP
loamy sand,
sand.
115--------------i 0-] ,Silt loam--------,ML ,A-4 i 0 i 100 i 100 i8D-90 ,70-60 i 20-30 i NP-5
Sultan i ]-60~Silt loam, silty iCL-ML, CL iA-4, A-6 , 0 i 100 ~ 100 195-100,00-90 ~ 25-35 ~ 5-15
clay loam.
116--------------. 0-0 Silt loam--------,ML, OL ,A-4 i 0 i 100 ~ 100 190-100 170-90 i 30-40 i NP-10
Tacoma ~ ]-50i5f1t loam, very ,ML ,A-9 0 ~ 100 i 100 i95-IOOiES-95 i 25-36 i NP-10
fine sandy loam.
X50-60~6i1t loam, silty iCt ,A-6, A-] i 0 ~ 100 i 100 195-100190-1001 30-50 i 10-25
clay loam, clay.
See footnote at end of table.
Thur,:Dn County. Washington
TABLE 15.--PHYSICAL AND CHEMICAL PROPERTIES OF THE SOILS--Continued
Soil name and ,Depth, Clay ', Permeability Available Soil ~ Shrink-swell
map symbol i i i ~ water capacity ,reaction, potential
27:
109--------------i 0-221 7-15 i 2.0-6.0 i 0.12-0 .14 15.6-6.0 iLOw------------10.241 5 1 5-15
Spa a ,22-26, 5-15 i 2.0-6.0 ~ 0.19-0 .1] 15.6-6.0 ,Low------------,0.1], '
126-381 5-15 ~ 2.0-6.0 ~ 0.09-0 .12 ,5.6-6.0 ,Low------------10.101 ~
3&-60, 2-5 ~ 6.0-20 , OAS-0 .08 15.6-6.0 ,Lox------------i0.05~
i i i i i i ~
i
~ 110,-F33---------i 0-15~ --- i 2.0-6.0 ~ 0.11-0 .13 15.1-6.0 ~LOx------------~O.15i 2 i 5-15
_ Hpanaway ,15-201 -- i 2.0-6.0 ~ 0.09-0 .12 ,5.1-6.5 ,Low------------10.101 '
120-60, 0-5 ~ >20 ~ 0.03-0 .05 ,6.1-7.3 ,Low------------i0.02~
112,-kkJ---------i 0-161 --- i 2.0-6.0 ~ 0.11-0 .13 X5.1-6.0 ~LOw------------'0.15
~ 2
5-15
i
8panaway 116-22, ---
i 2.0-6.0
i 0.09-0 .12
15.1-6.5
Low------------,0.10,
i
'
i
22-60, 0-5 i >20 i 0.03-0 .05 16.1-].3 ,Low------------, O. W, ~
119*:
8panaway--------i 0-151 --- i 2.0-6.0 ~ 0.11-0 .13 15.1-6.0 iLOw------------~O.15i 2 1 5-15
15-201 -'- i 2.0-6.0 ~ 0.09-0 .12 ,5.1-6.5 iLOw------------10.101
20-601 0-5 ~ >20 i 0.03-0 .05 16.7-].3 ,Low------------, 0.@, ~
i
Niscually-------. 0-5 ~ i
0-5 i i
2.0-6.0 i
0.09-0
.12 i
,5.6-6.5 i i i
iLOw---------~--~0.20i i
5, 3-10
~ 5-311 0-5 i 2.0-6.0 ~ 0.08-0 .12 15.6-6.5 ,Low------------i0.28~ ~
31-601 0-5 ~ )20 ~ 0.04-0 .0] ,6.1-73 iLOw------------i0.24~ ~
115--------------i 0-] ~ 15-20 ~ 0.6-2.0 ~ 0.18-0. 20 ,6.1-].3 iLOw------------,0.3 ], 5 ~ 5-10
Sultan i ]-601 20-30 ~ 0.6-2.0 ~ 0.18-0 .20 ,6.1-73 ~Pioderate-------,0.32, ~
116-------------i 0-7 ', 5-18 ~ C.6-2.0 ~ 0.25-0 .35 13.6-5.5 iLOw------------,0.28, 5 i 10-20
Tacoma , 7-50; 5-18 ~ 0.2-0.6 ~ 0.20-0. 30 ,3.6-5.5 ,Law------------10.321 '
50-50, 2G-50 ~ 0.2-0.6 ~ 0.19-0. 21 ,3.6-5.0 ,Moderate-------i0.32~ ~
11], 118, 115----~ 0-11, 10-15. ~ -0.6-2.0 i 0.12-0. 14 ,5.1-6.0 ~LOw-----------~0.20i 2 i 5-10
Tenino ill-36, 10-15 ~ 0.6-2.0 ~ 0.12-0. 14 ,5.1-6.0 ,Low------------i 0.20, ~
136-401 i
---
i
---
i ___ ~ ___
i i_______________i____i
i ~
i
140-60, 2-10 ~ >20 ~ 0.06-0. 0] ,5.1-6.0 ,Low------------i 0.021
120--------------~ 0-11, --- ~ 0.6-2.0 , 0.25-0. 35 ,5.6-].3 ~LOw------------i0.28~ 5 ~ 3-10
Tisch ill-50, --- i 0.2-D.6 i 0.25-0. 35 ,5.6-].3 ,Low------------,0.28,
50-601 --- i 0.6-2.0 i 030-0. 40 15.6-].3 ,Low------------10.001
121, 122---------i 0-f0, --- ~ 0.6-2.0 i 0.25-0. 35 15.1-6.0 ,Low------------,0.24, 3 i 5-10
Vailton 110-15, --- i 0.6-2.0 i 0.25-0. 35 ,5.1-6.0 ,Low------------,0.24,
15-481 --- i 0.6-2.0 , 0.20-0. 30 ,5.1-6.0 ,Low------------,0.15, ~
~ g8 i
i
i
i ___
i i_______________~____i
i i i
~
123, 124---------i 0-11, 10-25 ~ 0.6-2.0 ~ 0.1]-0. 20 ,5.1-6.0 iLOw------------i0.32~ 5 i 5-10
Wilkes on ,11-4]i 25-35 ~ 0.6-2.0 ~ 0.12-0. 1] ,5.1-6.0 ,Moderate-------,0.20,
4]-60, 18-35 ~ 0.6-2.0 ~ 0.15-0. 20 15.1-6.0 iMOderate-------0.20
125.
%eror[hen is '
126, 12], 128----i 0-8 ~ --- ~ 2.C-6.0 ~ 0.25-0. 35
5.6-6.5
.Lax------------i032~
5 ~ 3-9
Ye 1m i e-461 --- . 2.0-6.0 0.15-0. 25 ,5.6-6.5 ,Low------------,0.321
146-60'1 0-5 i 6.0-20 ~ 0.04-0. 09 ,5.6-6.5 ,Low------------,0.10, ~
* See description of the map unit Eor composition and behavior characteristics of the map unit
Thurston County, lNZShingtOn
Soil name and
mop symbol
277
TABLE 16.--WATER FEATURES--Continued
Flooding Hiqh water table
Hydrologic
group Frequency Duration ~ Months Depth Kind ~ I9onths
:
100r 101 ________________i
p
Scamman
102, 103________________i B
Schneider
109_____________________i C
Sem iahmoo
:
:
105_____________________i
p
Shalcaz
306_____________________i D
Shalcaz Variant
107, lOB----------------i D
Skipopa
109_____________________i D
Spana
~ uD,~r,~ uz, 1i3------~ a
Spanaway
:
119*:
:
:
SPanawaY_______________i
g
9 Y____________
Nis call --. 6
115_____________________i C
Sultan
116_____________________i D
Tacoma
117, 118, 119-----------i C
Ten ino
120_________________~___i D
Tisch
121, 122________________i 8
Vailton
123, lI9________________i B
Wil kwon
125_____________________i C
Xeror [hoots
126, 127, 12E----------i C
Yelm
Ft
--- --- 0.5-1.6 liPerched
: :
: : :
___ ' ___ ' >6 0 i ___
--- --- i 1.5-3.0 iAppazent
--- --- +1-0 iApparent
: ~ ~
: i :
ig----------i Nov-May ~ +1-0 iAPParent
--- --- ~ 1.0-2.0 ~~Perched
--- --- i 1.0-3.0 ~AppazenY
: :
: : :
___ ___ ~ )6.0 ~ ___
___ : ___ i >6 0 i ___
: :
: :
___ ' ___ ' )6 0 i ___
: :
: : :
---------i Nov-Apr ~ 2.0-9.0 ,Apparent
: i ~
: i :
---------~ Nov-Jun ~ +1-0 ~Appazent
i
: ~
___ i ___ i )6.0 i ___
--- --- 0-1.0 ~Appazent
___ ___ )6.0 ___
: :
: : :
-- i --- i >6.0 i ---
--- --- >2.0 iApparent
--- : --- i 1.5-3.0 ~Appazenf
* See description of the map unit Eor composition and behavior characteristics of the map mit.
APPENDIX D - BMPs
SK/LL/NGS CONNOLLY, INC. a Velm Property Development LLC
Hytlmlogy Report
THE HUTCH
SOIL TEST HOLES
April 2006
Test Hole 1
0" - 12" Loam
12" - 78" Brown Sandy Gravel w/ Cobbles
8" - 138" Gray Sandy Gravel w/ Cobbles
Test Hole 2
0" - 30" Loam w/ Cobbles
30" - 96" Med Sand w/ Cobbles
96" - 126" Sandy Gravel
Test Hole 3
0" - 30" Loam w/ Cobbles
30" - 78" Brown Med Sand w/ Cobbles
78" - 120" Gray Med Sand /Cobbles
Test Hale 4
0-42" Loam w/ Cobbles
42" - 108" Brown Med Sand
108" - 144" Gray Sandy Gravel
Test Hole 5
0"-28" Loam w/ Cobbles
28"-90" Brown Sandy Gravel w/ Cobbles
90"-128" Gray Sandy Gravel w/ Cobbles
Test Hole 6
0" - 20" Loam
20" - 105" Brawn Med Sand Gravel w/ Cobbles
Test Hole 7
0" - 30" Loam
30" - 96" Brown Med Sandy Gravel
Test hole 8
0"-20" Loam w/ Cobbles
20"-75" Brown Sandy Gravel w/ Cobbles
75"-120" Gray Sandy Gravel w/ Cobbles
Stormwater Program Guidance Manual
Volume l1
PURPOSE
Many products and practices commonly used in and around our houses are hazardous to
both ourselves and the environment. The purpose of this chapter is to give alternatives,
where possible, for those types of products and practices. There are two categories of
BMPS in this chapter. The first category of BMPS includes "goad housekeeping" practices
that everyone should use. The second category of BMPS deals with erosion and pollution
control practices for people who raise large animals.
RECOMMENDED POLLUTION CONTROL PRACTICES FOR HOMEOWNERS
It has been said that the average home today contains more chemicals than the average
chemical lab of .100 years ago. When many of these chemicals are used industrially, they
can be subject to various health and safety standards; yet these same substances are used
freely and often carelessly in homes across the nation.
The BMPS in this section are divided into four categories: Household Hazardous Wastes,
Pesticides, Remodeling, and Septic Maintenance. Each section includes information on
available alternatives.
Household hazardous wastes
Many of the cleaning agents, solvents, polishes, etc. used commonly in the home are
considered hazardous wastes. Theseproducts may be toxic, corrosive, reactive,
flammable, and/or carcinogenic.. It is critical that these products are disposed of properly.
A list of some common household hazardous wastes is presented in Table 1.
In addition, many hazardous household chemicals persist for long periods of time in the
environment. Manufacturers may truthfully state that a product is "biodegradable"; most
products are biodegradable, but what is important is the r eat which they are broken
down and the r uc they. are6roken down into. The term "hiodegradable" on its own
is thus rather meaningless unless the product is rapidly degraded into harmless breakdown
products.
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It is important to note here that the term "biodegradable" currently has no legal definition
in this state. This means that any product can use this term according to the
manufacturer's own definition. This definition may not be at all similar to the consumer's
perception.
Household oroduct manacement
Buy only those detergents that contain little or no phosphorus. Phosphorus can
cause algae blooms if it is washed into lakes, streams, bays ar from septic systems
into ground water. Most detergents which are low or phosphate free are labeled as
such.
2. Use only the manufacturer's suggested amount of any cleaner. More is not
necessarily better. .
3. Products such as oven cleaner, floor wax, furniture polish, drain cleaners, and spot
removers often contain chemicals that are toxic.. Buy the least toxic product
available, and use anon-toxic substitute if one can be fountl. Ovens, for example
can be cleaned by applying table salt to spills, then scrubbing with a solution of
washing sodaand water. Table 2 lists some substitutes for commonly used
household cleaners.
If it is necessary to use a product that contains toxic chemicals, then use the
product only as directed. Do not combine products, as they may become more
dangerous when mixed (such as chlorine bleach and ammonia). Use protective
clothing and rubber gloves.
Contact the Hazardous Substance Hotline at 1-300-633-7585 if you have any
Questions regarding how to dispose of a product or empty container. Many areas
now have either hazardous waste collection days, or permanent facilities where
residents can bring hazardous wastes. Call your county's environmental health
department for further information.
4. Chemicals left over from such hobbies as photography era hazardous and should
not be flushed down the sink. This is especially important if your home is hooked
up to a septic system. Toxic chemicals can kill the bacteria in the tank that treat
sewage.
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5. Buy toxic products in small quantities. If you cannot use all of the product, try to
give it away instead of disposing of it.
6. Be sure that the contents of all containers are clearly marked.
Common (not automobile) batteries are one of the worst sources of heavy metals
found in landfills: Instead of throwing them away, dispose of them at a hazardous
waste collection site.
AUTOMOTIVE USAGE, CARE AND MAINTENANCE
1. Cars should be serviced regularly. Any leaky lines or valves should be replaced.
Dumping oil, degreasers, antifreeze, and other automotive liquids into a stream or a
storm drain is illecal. Do not dump them onto the ground because they will'end up
in stormwater runoff once it rains. Do not use oil to reduce dust levels on unpaved
areas.
2. If possible, recycle used oil and antifreeze. Keep them in separate containers. Call
the Recycling Hotline at 1-B00-RECYCLE for the location of the nearest recycling
center or call your local gas stations.
3. Wrap empty oil or antifreeze containers in several layers of newspaper, Yie securely
and place in a covered trash can. Antifreeze is sweet-tasting, but poisonous to
people, fish, pets and wildlife.
4. Sweep your driveway instead of/or before hosing it down. Many toxicants and
heavy metals associated with automobiles can build up on driveway surfaces and
be washed into local surface water when driveways are hosed down.
5. When washing vehicles, direct soapsuds onto the lawn or another vegetated area to
keep the soap from washing into the local surface water.
6. Small spills of oil and other fluids can be absorbed by using materials such as kitty
litter or sawdust. Wrap the used kitty litter and any contaminated soil in a plastic
bag and then place it in the garbage. If a spill reaches surface water, you must
notify the nearest regional office of the Department of Ecology:
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Northwest Region -Redmond 867-7000 (24-hour)
Southwest Region -Olympia 753-2353 124-hour)
There are fines for failure to notify the appropriate agency when a spill occurs
Deicing chemicals (most commonly salt) are often used on private sidewalks and
driveways during cold winter weather. These chemicals can harm concrete less
than three years in age, and burn vegetation. They are also corrosive to cars and
other metal objects. Not only are the deicing chemicals pollutants, but the
additives are often pollutants as well. Cyanide is formed from the breakdown of a
common anti-caking agent used in deicing chemicals:
Urea salts have been proposed as an alternative to other types of salt deicers, but
great care must be used in applying them. These salts contain large quantities of
nitrogen, which can severely burn plants if over-applied. '
The use of these chemicals should be minimized or avoided if possible. While
deicing chemicals are more effective in removing snow from roads than are grits
such as sand, they cause much worse pollution and if used at all should be used in
moderation.
SMALL BOAT USAGE, CARE AND MAINTENANCE
In narrow creeks and coves boat wakes can contribute to shoreline erosion. To
minimize erosion, boats should not produce wakes within 500 feet of shore. A
speed greater than 6 knots can cause a wake with great erosive force.
2. When washing a boat, use low phosphate or phosphate free detergent. Using a
brush and scrubbing the boat down after each use can minimize the need for
washing. When possible, avoid stain-removing products as they are generallytoxic.
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Table 1 Hazardous Household Substances List
Reoair and Remodelin
1. Adhesives, glues, cements.
2. Roof coatings, sealants.
3. Caulking and sealants.
4. Epoxy resins.
~ 5..Solvent-based paints.
~'~. 6. Solvents and thinners.
7. Paint removers and strippers.
Cleaning Agents
t. Oven cleaners
2. Degreasers and spot removers
3. Toilet, drain and septic tank cleaners
I 4. Polishes, waxes and strippers
5. Deck, patio and chimney cleaners
6. Solvent cleaning fluids
Pesticides
t. Insecticides
2. Fungicides
3. Rodenticides
4. Molluscicides
5. Wood preservatives
6. Moss retardants
7. Herbicides
8. Fertilizers
Auto,.BOat and Eouioment Maintenance
1. Batteries
2. Waxes and cleaners
3. Paints, solvents and thinners
4. Additives
5. Gasoline
6. Flushes
7. Auto repair materials
8. Motor oil
9. Diesel oil
10. Antifreeze
Hobbv and Recreation
1. Paints, thinners and solvents
2. Chemicals-(photo and poo!1
3. Glues and cements
4. Inks and dyes
5. Glazes
6. Chemistry sets
7. Bottled gas
8. White gas
9. Charcoal starter fluid
MiSCellane
1. Ammunition
2. Asbestos
3. Fireworks
Source: Guidelines for Local Hazardous
Waste Planning, Ecology, No. 87-78, 7987.
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Table 2 Non-Toxic or Less Toxic Alternatives to Toxic Products
Hazardous Product Alternative(s)
Air fresheners Set out a dish of vinegar or simmer
cinnamon and cloves or set out herbal
bouquets or potpourri in open dishes or burn
scented candles.
.Bleach Borax or oxygen bleaches or reduce bleach
by %, and add %. -'h C. baking soda, or let
clothes dry in the sun.
Brass polish - Worcestershire sauce.
Chrome polish Apple cider vinegar or a paste of baking
soda and water or a lemon peel.
Coffee stains Moist salt paste.
Coffee pot cleaner Vinegar.
Copper cleaner Mix lemon juice and salt or use tomato
catsup.
Drain cleaner Use a plunger followed by '/: C. baking soda
mixed in 'h C. vinegar. Let sit 15 minutes,
pour down 2 qts. boiling water.
Furniture polish Linseed, olive or almond oils or a mixture of
3 parts olive oil to 1 part white vinegar or a
mixture of 1 Tbsp. lemon oil and 1 pint
mineral oil.
Garbage disposal deodorizer Used lemon rind or baking soda.
Glass cleaner Mix 2 Tbsp. vinegar with 1 quart water.
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Grease remover Make a paste of borax on a damp cloth.
Ink stain remover - Spray with leftover non-aerosol hairspray
before washing.
Laundry soap Borax, baking soda or washing soda.
Linoleum floor cleaner 1 C. white vinegar in 2 gals. water.
Mildew remover Equal parts vinegar and salt. ~,.
Mothballs Cedar chips or blocks, or use dried tansy,
lavender or peppercorns in drawers and
closets.
Oil spills Kitty litter, sawdust.
Oil stain removal White chalk rubbed into the stain prior to
washing.
Over cleaner Pour lots of salt on fresh spills and scrape
off after the oven cools. A. soda water
solution will cut grease. Paint ammonia on
spills with a paintbrush; then rinse off.
Paint brush softener Hot vinegar.
Paint/grease remover Wear gloves or use baby oil.
Paint stripper Use mechanical sanding instead of chemical
strippers.
Pet odor removal Cider vinegar.
Pitch or sap remover Butter, margarine or vegetable shortening.
Porcelain stain remover Baking soda.
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Refrigerator deodorizer
Rug/carpet cleaner (general)
Rug/carpet cleaner (spots)
~, Rust removal
Rusty bolt remover
Scorch mark remover
Spot remover
Scouring powder
Silver polish
Stainless steel polish
'i, Toilet bowl cleaner
Tub and file cleaner
Upholstery spot remover
Water mark remover
Water softener
Open box of baking soda.
Use asoap-based non-aerosol rug shampoo,
vacuum when dry.
Pour on club soda or sprinkle cornmeal or
cornstarch on the rug, let sit at least 30
mins. then vacuum.
Lemon juice plus salt plus sunlight.
Carbonated beverage.
Grated onion.
Club soda, lemon juice or salt or rub with a
cornstarch paste, brush off when dry.
Baking soda or anon-chlorine scouring
powder.
Soak silver in warm water with 7 Tbsp.
soda, 1 Tbsp. salt and a piece of aluminum
foil.
Mineral oil.
Past of borax and lemon juice.
'/. C. soda and %, C. white vinegar mixed
with warm water.
Club soda.
Toothpaste.
%. C. vinegar.
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Boat hulls may have been repainted with tributyltin (a paint) to prevent fouling. This
type of paint is eMremely toxic to marine life. When scraping the boat bottom,
catch the scrapings with a drop cloth. Compress the scrapings into as small a can
as possible, label the can and turn it in to the nearest household hazardous waste
collection center. Repaint the hull using acopper-based paint. Copper-based paints
are less toxic (although not non-toxic) to marine life.
PESTICIDES' AND FERTILIZERS
Pesticides (such as insecticides and herbicides) and fertilizers are commonly used by
homeowners in their quest for bigger, healthier plants. These chemicals are easily
overused. Homeowners often do not know just how much fertilizer is necessary in their
soil. Often, people assume that more is better. These chemicals are easily introduced into
stormwater runoff and can cause algae blooms (fertilizers) or kill off aquatic organisms
Ipesticidesl.
Fertilizer management
1. Before fertilizing, test your soil. This can be easily done by using kits that are
available, or through tests provided by the County Cooperative Extension office in
your area. Use only the recommended amount of fertilizer. -
2. Use fertilizers that are appropriate for your area, and for fhe type of plants you are
growing. Work the fertilizer into the soil directly around the plant's drip line. By
incorporating the fertilizer into-the soil, there will be less likelihood of contaminated
runoff.
3. Water before fertilizing. Water enough to dampen the ground thoroughly, but not
enough to cause surface runoff.
4. Many soils can benefit from the use of organic fertilizers such as compost or peat.
Not only do these substances add nutrients to soil, they also increase the porosity of
the soil and increase its ability to hold water.
' As used here, the word pesticide can mean any herbicide, insecticide, rodenticide, miticide or other types
of chemicals used in the same manner.
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5. Slow release fertilizers (which are generally resin-coated) can be used in addition to
organic fertilizers. They are not mobile in the soil, and are only applied once, which
saves work.
Integrated nest manacement
Rather than bringing out the sprayer whenever a pest infestation occurs in the garden,
consider using Integrated Pest Management (also known a5 IPM). IPM emphasizes the
•evaluation of all factors including environmental effects before chemicals are applied.
Pesticides should only be used as a last resort. IPM maximizes the use of natural pest
controls. Some of the tactics that can be used to decrease or eliminate the use of
pesticide sprays include:
tr~n of Natural Predators. Pathocens: Because sprays generally kill many
beneficial insects instead of just the target pest, it may be necessary to
introduce natural predators back into the garden. Ladybugs, lacewings,
predatory wasps, and nematodes are all commercially available. Gartersnakes
and toads are also predators and should not be eliminated from the garden. ~.
There are some bacteria, viruses, and insect parasites that are specific to pests
and will not harm other insects or animals. A commonly used bacterium in the
Puget Sound area is Baci/!us thuringiensis IBtI, which is intended to control
infestations of tent caterpillars.
Habitat Chances: Many times a change of habitat can control pest
infestations. Removal of old tires can cut down on the mosquito population by
removing a convenient water-filled location that they can breed in. Crop
rotation, even in a small garden can reduce the number of pest infestations.
Removing last year's leaves from under rose bushes can cut down on the
incidence of mildew and blackspot, as these Tungi overwinter in tlead leaves.
Timinc: Craps that can overwinter Isuch as leeks or carrots) should be planted
in the fall. This gives them,the time to become established before pests
appear in the spring.
Mechanical: Many eggs, larvae, cocoons, and adult insects can be removed by
hand. Be sure that the insect is properly identified prior to removing it so that
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4. Never apply pesticides near streams, ponds, or wetlands. Do not apply them to bare
or eroded ground. Many pesticides bind to soil particles and can be easily carried
into a stream or storm drain.
5. Pesticides should be stored well away from living areas. Ideally, the storage area
should have a cement floor and be insulated from temperature extremes. Always
keep pesticides in their original containers with labels intact. Labels often corrode
and become illegible in this climate and may have, to be taped onto the container.
6. Federal law now requires that all pesticides be labelled with the appropriate disposal
method. Leftovers should never be dumped anywhere, including a landfill. Many
counties in this area conduct hazardous waste collection days or collect waste
regularly at the landfill. Contact the county environmental health department for
more information.
7. Empty containers should be triple-rinsed and the leftover rinse water used as spray.
Once containers are triple-rinsed, they are not considered hazardous waste and may
be disposed of in most landfills. However, call your local landfill before putting the
container in the garbage.
8.' If a pesticide is spilled onto pavement, it can be absorbed using kitty litter or
sawdust. The contaminated absorhent should be bagged and labeled and taken to a
hazardous waste collection site. If the pesticide is spilled onto dirt, dig up the dirt,
place it in a Dlastic bag and take it to a hazardous waste collection center.
9. Many pest control companies and licensed applicators have access td pesticides that
are more toxic than those available to the consumer. Check with the company
before they spray indoors or outdoors to find out what spray they will be using and
what precautions, if any, are necessary after the operator leaves.
HOME REMODELING
Remodeling uses some of the most toxic substances found in the home. Paints,
preservatives, strippers, brush cleaners, and solvents all contain a wide range of
chemicals, some of which are suspected to be carcinogens (cancer-causing). These
products should never be dumped in a landfill or put down a sewer or septic system.
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1. When building a deck consider using wood instead of concrete. Wood decking
allows rainwater todrip onto the ground below, keeping it from becoming surface
runoff.
2. Decks and sidewalks can also be built out of brick interlocking pavers or modular
concrete. If these surfaces are placed on a bed of well-drained soil, gravel or sand,
rainwater can infiltrate into the ground through them.
3. To reduce disposal problems, buy only the amount you need. Used turpentine or
brush cleaner can 6e filtered and reused. Paint cans should be allowed to dry and
then be disposed of during a hazardous waste collection day or at a permanent
collection location.
4. Large amounts of .leftover paint canbe given away, for example to a theater group.
Currently, the City of Seattle is experimenting with recycling latex paint turneff in as
hazardous-waste. It is blended, cleaned, tinted, and is now being sold on a trial
basis as "Seattle Beige."
5. Roof downspouts cambe adapted to infiltrate runoff where the soil is well drained.
The runoff from them can enter a gravel bed where it can infiltrate into the ground.
"For design criteria, see BMP RI-15, Roof Downspout Systems in Volume III ofthe
Stormwater Management Manual for the Puget Sound Basin.
6. When gardening on slopes, reduce the potential for surface runoff by using terraces
across the face of the hill. These can be as simple as little soil "bumps" or can be
elaborate using such products as pressure-treated wood 4x4s or rock walls.
SEPTIC SYSTEM CARE AND MANAGEMENT
While septic systems do not seem to have a direct relationship with Stormwater runoff,
they can in some instances be related.
Roof drains and Stormwater runoff should be diverted away from drainfields. Excess
water reduces the capacity of the drainfield to absorb effluent from the septic tank.
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2. Water from hot tubs should not be drained into a septic system all at once. They are
not designed to handle large volumes of chlorinated water. Either use the water on
plants in the yard, or drain the hot tub slowly over a period of days.
Septic tank tanks should be pumped regularly. Ponded water, damp places in the
yard, foul odors and/or a dark gray or hlack soil color may indicate septic drainfield
failure. Effluent from a malfunctioning septic tank can cause disease and nitrate
problems in groundwater.
LARGE ANIMAL MANAGEMENT
People often own livestock in low-density residential areas. Horses are the most popular
animal, but goats, cows, sheep, llamas, pigs and chickens are also kept. Nearby streams
and lakes can be adversely affected by manure-contaminated Stormwater draining from
pastures. Overgrazing, a common problem, denudes pastures and allows excessive runoff
and erosion. Contamination frequently occurs when animals defecate directly info a lake
or stream. Streambanks can also be broken down.
It is essential for livestock owners to install BMPS similar to those described below. Not
only will they help in controlling water quality, but they willhelp maintain productive
pastures by increasing the grass cover and reducing erosion.
Pasture management
Pastures should be fenced to keep animals away from surface water. If stock must
be watered•at a stream, use cramp-and-fence system to keep them out of the water
(Figure 1). A minimum t0-foot strip of vegetation should be left between the fence
and the water.
2. If the buffer area around the water cannot be fenced., it should be planted with a
"living fence," vegetation that is impenetrable to livestock. The buffer strip should
6e at least 25 feet wide. Consult with local government for any other restrictions
and/or the restrictions contained in a Sensitive Areas Ordinance, if passed.
3. Avoid overgrazing. Restrict grazing during the winter months when grasses are
dormant and easily overgrazed. Grazing when the soil is wet can cause compaction
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of the soil and can result in reduced plant growth, erosion; and contamination of
surface water.
4. If animals must be kept in a pasture over the winter, a small "sacrifice" area should
be used for feeding and watering. This will limit the amount of land disturbed and
reduce the area of pasture that will need reseeding. The sacrifice area should be
located away from streams or standing water. Portahle electric fencing can 6e used
to keep the animals in this temporary area.
5. Always limit the number of animals pastured based on the amount of land available
and pasture productivity. The local Conservation District can offer advice on the
proper stocking rate for your land. The smaller the acreage grazed, the greater the
chance for vegetative destruction, even when hay is provided.
6. Intensive livestock use may necessitate reseeding of a pasture every two to three
years to optimize production and minimize the chance of erosion. Ideal renovation
entails plowing the pasture and sowing an annual crop such as corn, oats, or annual
rye grass for one year and reseeding again the following year. Animals should be
kept off the new seeding for the first year. Fields may be hayed towards the end of
the first growing year.
7. Ifplanting an alternate crop for one year is not possible, some coverage and plant
species improvement can be achieved by disking the pasture and reseeding.
6. Overgrazing can also be avoided by dividing the pasture into three or more units and
establishing a grazing rotation period that allows foliage three to four weeks of
regrowth between grazing periods. A portable electric fence can also be used in this
situation.
9. The Soil Conservation Service and the County Conservation District can provide
growers with details of these practices.
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Figure 1
zxy"aR onr~ sroy
DevrcE ~ P,cEV~r
CA7TtE /rOOVbS PPphl
SL/PPINrs IN1U 3'+XEAAl
Hof
~ _ i
ii ~ = ~
. "~ _~~
WIRE
~~/
RAMP // //
/% ~ /
Animal waste manacement
1. Manure should be collected regularly and stored. The storage site should be an area
well away from creeks, ditches, marshes, and ponded or flowing water, where off-
site runoff cannot mix with manure and where seepage from manure cannot enter
surface water.
2. Stored manure should be covered with either a roof~or plastic sheeting to prevent the
entry of rainwater.. Rooftop runoff from the manure storage area should be diverted
away from the storage area by using gutters and downspouts. This clean water can
be infiltrated back into the ground to recharge ground water. BMPs III-RI-t 5 and III-
RI-16 in Volume III of the Stormwater Management Manual for the Puget Sound
Basin give design criteria for roof downspout infiltration systems.
3. Small watercourses adjacent to the manure storage area should be redirected or
enclosed. To do any work in or on streambanks, a short-term water quality
modification permit or a hydraulic permit approval may be required.
1
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4. Concrete slabs with walls or curbs will provide the most control for manure storage.
The storage area should 6e designed so that liquid wastes are retained and directed
to a liquid storage area.
5. Manwe may be given away, or used as fertilizer on seeded pastures.
i
I
REFERENCES
Puget Sound Water Quality Authority, Manacinc Nonooint Pollution -
an Action Plan for Puaet Sound Watersheds, 88-81, June, 1989.
Washington State Dept. of.Ecology, Water Quality Guide -Recommended
Pollution Control Practices for Homeowners and Small Farm Operators 87-30,
revised June, 199E -
Washington State Dept. of Ecology, Hazardous Waste Pesticides, 89-41, August, 1989.
Washington State Dept. of Ecology, Turnino the Tide on Toxics in the Home 1989.
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17 Besi Management Practices
BMPS for Description of Pollutant Sources: Landscaping can include grading, soil
Landscaping transfer, vegetation removal, pesticide and fertilizer applications, and
and Lawn/ watering. Stormwater contaminants include toxic organic compounds,
Vegetation heavy metals, oils, total suspended solids, coliform bacteria, fertilizers, and
Management pesticides.
Lawn and vegetation management can include control of objectionable
weeds, insects, mold, bacteria and other pests with chemical pesticides and
is conducted commercially at commercial, industrial, and residential sites.
Examples include weed control on golf course lawns, access roads, and
utility corridors and during landscaping; sap stain and insect control on
lumber and logs; rooftop moss removal; killing nuisance rodents;
fungicide application to patio decks, and residential lawn/plant core.
Toxic pesticides such as pentaehlorophenol, carbamates, and
organometallics can be released [o the environment by leaching and
dripping from treated parts, container leaks, product misuse, and outside
storage of pesticide contaminated materials and equipment. Poor
management of the vegetation and poor application of pesticides or,
fertilizers can cause appreciable s[ormwa[er contamination.
Pollutant Control Approach: Control of fertilizer and pesticide
applications, soil erosion, and site debris to prevent contamination of
stormwa[er.
Develop and implement an Integrated Pest Management Plan QPM) and
use pesticides only as a last resort. If pesticides herbicides are used they
must be carefully applied in accordance with label instructions on U.S.
Environmental Protection Agency (EPA) registered materials. Maintain
appropriate vegetation, with proper fertilizer application where
practicable, to control erosion and the discharge of s[ortnwa[er pollutants.
Where practicable grow plant species appropriate for the site, or adjust the
soil properties of [he subject site [o grow desired plan[ species.
Applicable Operational BMPS for Landscaping
• Install engineered soil/landscape systems to improve [he infiltration
and regulation of s[ormwater in landscaped areas.
• Do not dispose of collected vegetation into waterways or storm
drainage systems.
Recommended Additional Operational BMPS for Landscaping:
• Conduct mulch-mowing whenever practicable
• Dispose of grass clippings, leaves, sticks, or other collected vegetation,
by composting, if feasible.
August 2001 Volume IV -Source Control BMPS 2-23
• Use mulch or other erosion control measures when soils are exposed
for more than one week during [he dry season or two days during [he
rainy season.
• If oil or other chemicals are handled, store and maintain appropriate oil
and chemical spill cleanup materials in readily accessible locations.
Ensure [hat employees are familiar with proper spill cleanup
procedures.
• Till fertilizers into the soil rather than dumping or broadcasting onto
the surface. Determine the proper fertilizer application for the types of
soil and vegetation encountered.
• Till a topsoil mix or composted organic material into [he soil [o create
a well-mixed transition layer that encourages deeper root systems and
drought-resis[an[plants.
• Use manual and/or mechanical methods of vegetation removal rather
than applying herbicides, where practical.
Applicable Operational BMPs for the Use of Pesticides:
• Develop and implement an IPM (See section on IPM at end of BMP)
and use pesticides only as a last resort.
• Implement a pesticide-use plan and include a[ a minimum: a list of
selected pesticides and [heir specific uses; brands, formulations,
application methods and quantities to be used; equipment use and
maintenance procedures; safety, storage, and disposal methods; and
monitoring, record keeping, and public notice procedures. All
procedures shall conform to the requirements of Chapter 17.21 RC W
and Chapter 16-228 WAC (Appendix IV-D R.7).
• Choose the leas[ toxic pesticide available that is capable of reducing
the infestation to acceptable levels. The pesticide should readily
degrade in the environment and/or have properties that strongly bind it
to the soil. Any pest control used should be conducted at the life stage
when the pest is most vulnerable. For example, if it is necessary to use
a Bacillus thurin iex ns is application [o control [en[ caterpillars, i[ must
be applied before the caterpillars cocoon or it will be ineffective. Any
method used should be site-specific and not used wholesale over a
wide area.
• Apply the pesticide according to label directions. Under no conditions
shall pesticides be applied in quantities that exceed manufacturer's
instructions.
• Mix the pesticides and clean the application equipment in an area
where accidental spills will no[ enter surface or ground waters, and
will not contaminate the soil.
2-24 Volume IV -Source Control BMPs August 2001
• Store pesticides in enclosed areas or in covered impervious
containment. Ensure that pesticide contaminated stormwater or
spills/leaks of pesticides arc not discharged to storm drains. Do not
hose down the paved areas to a storm drain or conveyance ditch. Store
and maintain appropriate spill cleanup materials in a location known to
all near the storage area.
• Clean up any spilled pesticides and ensure [hat the pesticide
contaminated waste materials are kept in designated covered and
contained areas.
• The pesticide application equipment must be capable of immediate
shutoff in the even[ of an emergency.
• Do not spray pesticides within 100 fee[ of open waters including
wetlands, ponds, and streams, sloughs and any drainage ditch or
channel that leads to open water except when approved by Ecology or
the localjurisdic[ion. All sensitive areas including wells, creeks and
wetlands must be flagged prior [o spraying.
• As required by the local government or by Ecology, complete public
posting of the area [o be sprayed prior to the application.
• Spray applications should only be conducted during weather
conditions as specified in [he label direction and applicable local and
state regulations. Do not apply during rain or immediately before
expected rain.
Recommended Additional Operational BMPs for the use of pesticides:
• Consider alternatives to the use of pesticides such as covering or
harvesting weeds, substitute vegetative growth, and manual weed
control/moss removal.
• Consider the use of soil amendments, such as compost, that are known
' to control some common diseases in plants, such as Py[hium root rot,
ashy stem blight, and parasitic nematodes. The following are three
possible mechanisms for disease control by compost addition (USEPA
Publication 530-F-9-044):
1. Successful competition for nutrients by antibiotic production;
2. Successful predation against pathogens by beneficial
microorganism; and
3. Activation ofdisease-resistant genes in plants by composts.
Installing an amended soilAandscape system can preserve both [he plant
system and the soil system more effectively. This type of approach
provides a soiUlandscape system with adequate depth, permeability, and
organic molter to sustain itself and continue working as an effective
stornnvater infiltration system and a sustainable nutrient cycle.
August 2001 Volume IV -Source Control BMPs 2-25
• Once a pesticide is applied, its effectiveness should be evaluated for
passible improvement. Records should be kept showing the
applicability and inapplicability of [he pesticides considered.
• An annual evaluation procedure should be developed including a
review of the effectiveness of pesticide applications, impact on buffers
and sensitive areas (including potable wells), public concerns, and
recent toxicological information on pesticides used/proposed for use.
)f individual or public potable wells are located in the proximity of
commercial pesticide applications contact the regional Ecology
hydrogeologist to determine if additional pesticide application control
measures are necessary.
• Rinseate from equipment cleaning and/or triple-rinsing of pesticide
containers should be used as product or recycled into product.
• The application equipment used should be capable of immediate
shutoff in the event of an emergency.
For more information, contact the WSUExtension Home Assist Program,
(253) 4#5-4556, or Bio-Integral Resource Center (BIRC), P.O. Dox 7414,
Berkeley, CA.94707, or the Washington Department of Ecology to obtain
"Hazardous Waste Pesticides" (Publication #89-41); and/or EPA to
abtnin a publication entitled 'Suspexded, Canceled and Restricted
Pesticides" which lists all restricted pesticides and the speck uses that
are n/Iowed. Ya/uable informationv from these sources may also be
available on the Internet.
Applicable Operational BMPs for Vegetation Management:
• Use at least an eight-inch "topsoil" layer with a[ least 8 percent organic
matter [o provide a sufficient vegetation-growing medium. Amending
existing landscapes and turf systems by increasing [he percent organic
matter and depth of topsoil can substantially improve the permeability
of the soil, the disease and drought resistance of [he vegetation, and
reduce fertilizer demand. This reduces the demand for fertilizers,
herbicides, and pesticides. Organic matter is [he least water-soluble
form of nutrients [hat can be added to the soil. Composted organic
matter generally releases only between 2 and 10 percent of its total
nitrogen annually, and this release corresponds closely to [he plant
growth cycle. If natural plan[ debris and mulch are re[umed to the
sail, this system can continue recycling nutrients indefinitely.
• Select the appropriate turfgrass mixture for your climate and soil type.
Certain tall fescues and tye grasses resist insect attack because the
symbiotic endophytic fungi found naturally in their tissues repel or kill
common Icaf and stem-eating lawn insects. They do no[, however,
repel root-feeding lawn pests such as Crane Fly larvae, and are toxic to
ruminants such as cattle and sheep. The fungus causes no known
2-26 Volume IV -Source Control BMPs Augusf 2001
adverse effects to the host plant or to humans. Endophytic grasses are
commercially available and can be used in areas such as parks or golf
courses where grazing does not occur. The local Cooperative
Extension office can offer advice on which types of grass are best
suited to the area and soil type.
• Use the following seeding and planting BMPs, or equivalent BMPs [o
obtnin information on grass mixtures, temporary and permanent
seeding procedures, maintenance of a recently planted area, and
fertilizer application rates: Temporary Seeding, Mulching and Malting,
Clear Plastic Covering, Permanent Seeding and Planting, and Sodding
as described in Volume II).
Selection of desired plant species can be made by adjusting the soil
properties of [he subject site. For example, a constructed wetland can
be designed to resist the invasion of reed canary grass by layering
specific strata of organic matters (e.g, compost forest product
residuals) and creating a mildly acidic pH and carbon-rich soil
medium. Consult a sail restoration specialist for site-specific ,
conditions.
Aerate lawns regularly in areas of heavy use where [he soil [ends [o
become compacted. Aeration should be conducted while [he grasses
in the lawn are growing most vigorously. Remove layers of thatch
greater than'/a-inch deep.
Mowing is astress-creating activity for [urfgrass. When grass is
mowed too short its productivity is decreased and there is less growth
of roots and rhizomes. The turf becomes Tess tolerant of
environmental stresses, more disease prone and more reliant on outside
means such as pesticides, fertilizers and irrigation to remain healthy.
Se[ [he mowing height at [he highest acceptable level and mow at
times and intervals designed [o minimize stress on [he turf. Generally
mowing only 1/3 of the grass blade height will prevent stressing the
turf.
7rrisation:
The depth from which a plant normally extracts water depends on the
rooting depth of [he plan[. Appropriately irrigated lawn grasses
normally root in the [op 6 [0 12 inches of soil; lawns irrigated on a
daily basis often root only in [he top I inch of soil. Improper irrigation
can encourage pest problems, leach nutrients, and make a lawn
completely dependent on artificial watering. The amount of water
applied depends on the normal rooting depth of the [urfgrass species
used, the available water holding capacity of the soil, and the
efficiency of the irrigation system. Consult with the local water utility,
Conservation District, or Cooperative Extension office to help
determine optimum irrigation practices.
August 2001 Volume IV -Source Control BMPs 2-27
Fertilizer Management:
• Turfgrass is most responsive to nitrogen fertilization, followed by
potassium and phosphorus. Fertilization needs vary by site depending
on plant, soil and climatic conditions. Evaluation of sail nutrient
levels throu_h regular testing ensures the best possible efficiency and
economy of fertilization. For details on soils testing, contact [he local
Conservation District or Cooperative Extension Service.
• Fertilizers should be applied in amounts appropriate for the target
vegetation and a[ the time of year that minimizes losses [o surface and
ground waters. Do no[ fertilize during a drought or when the soil is
dry. Alternatively, do not apply fertilizers within three days prior to
predicted rainfall. The longer the period between fertilizer application
and either rainfall or irrigation, [he less fertilizer runoff occurs.
• Use slow release fertilizers such as methylene urea, IDBU, or resin
coated fertilizers when appropriate, generally in [he spring. Use of
slow release fertilizers is especially important in areas with sandy or
gravelly soils.
• Time the fertilizer application to periods of maximum plant uptake.
Generally fall and spring applications are recommended, although
WSU turf specialists recommend four fertilizer applications per year.
• Properly trained persons should apply all fertilizers. A[ commercial
and industrial facilities fertilizers should not be applied to grass
swales, filter strips, or buffer areas that drain [o sensitive water bodies
unless approved by [he localjurisdiction.
/ntegrated Pest Management
An IPM program might consist of the following steps:
Step l: Correctly identify problem pests and understand their life cycle
Step 2: Establish tolerance thresholds for pests.
Step 3: Monitor to detect and prevent pest problems.
Siep 4: Modify the maintenance program [o promote healthy plants and
discourage pests.
Step 5: Use cultural, physical, mechanical, or biological controls first if
pests exceed [he tolerance thresholds.
Step 6: Evaluate and record the effectiveness of [he control and modify
maintenance practices to support lawn or landscape recovery and prevent
recurrence.
For an elaboration of these steps refer to Appendix IV-F.
2_pg Volume IV -Source Control BMPs August 2007
BMPs for Description of Pollutant Sources: Common road debris including eroded
Maintenance of soil, oils, vegetative particles, and heavy metals can be sources of
Roadside Ditches stormwater pollutants.
Pollutant Control Approach: Roadside ditches should be maintained to
preserve the condition and capacity for which they were originally
constructed, and to minimize bare or thinly vegetated ground surfaces.
Maintenance practices should provide for erosion and sediment control
(Refer to BMP landscaping and Lawn/Vegetation Management).
Applicable Operational BMPs:
Inspect roadside ditches regularly, as needed, to identify sediment
accumulations and localized erosion.
Clean ditches on a regular basis, as needed. Ditches should be kept
fret of rubbish and debris.
Vegetation in ditches often prevents erosion and cleanses runoff
waters. Remove vegetation only when flow is blocked or excess
sediments have accumulated. Conduct ditch maintenance (seeding
fertilizer application, harvesting) in late spring and/or early fall, where
possible. This allows vegetative cover to be re-established by the next
wet season thereby minimizing erosion of [he ditch as well as making
the ditch effective as a biofilter.
In the area between the edge of the pavement and the bottom of [he
ditch, commonly known as the "bare earth zone," use grass vegetation,
wherever possible. Vegetation should be established from the edgc of
the pavement if possible, or at least from the rop of the slope of [he
ditch.
Diversion ditches on top of cu[ slopes that are constructed to prevent
slope erosion by intercepting surface drainage must be maintained to
retain [heir diversion shape and capability.
Ditch cleanings are no[ [o be left on [he roadway surfaces. Sweep dirt
and debris remaining on [he pavement at the completion of ditch
cleaning operations.
Roadside ditch cleanings, not contaminated by spills or other releases
and not associated with a stormwater treatment system such as a
bioswale, may be screened [o remove litter and separated into soil and
vegetative matter (leaves, grass, needles, branches, etc.). The soil
fraction may be handled as `clean soils' and the vegetative matter can
be composted or disposed of in a municipal waste landfill. For more
information, please see "Recommendations for Management of Street
Wastes," in Appendix IV-G of this volume.
Roadside ditch cleanings contaminated by spills or other releases
known or suspected to contain dangerous waste must be handled
following the Dangerous Waste Regulations (Chapter 173-303 WAC)
unless testing determines i[ is not dangerous waste.
2.38 Volume IV -Source Control BMPs August 2007
Examine culverts on a regular basis for scour or sedimentation a[ [he
inlet and outlet, and repair as necessary. Give priority [o [hose culverts
conveying perennial and/orsalmon-bearing streams and culverts near
streams in areas of high sediment load, such as those near subdivisions
during construction.
Recommended Treatment BMPs:
Install biofdtration swales and filter strips-See Chapter 9, Volume V) to
treat roadside runoff wherever practicable and use engineered topsoils
wherever necessary [o maintain adequate vegetation (CH2M Hill, 2000).
These systems can improve infiltration and stormwater pollutant control
upstream of roadside ditches.
August 2001 Volume IV -Source Control BMPs
BMPs for Description of Pollutant Sources: Facilities include roadside catch
Maintenance of basins on arterials and within residential areas, conveyance systems,
Storm Water detention facilities such as ponds and vnul[s, oil and water separators,
Drainage and biofilters, scttling basins, inFltration systems, and all other types of
Treatment stormwatec treatment systems presented in Volume V. Roadside catch
Systems basins can remove from 5 [o I S percent of [he pollutants present in
stormwatec. When catch basins are about 60 percent full of sediment, they
cease removing sediments. Oil and grease, hydrocarbons, debris, heavy
metals, sediments and contaminated water are found in catch basins, oil
and water separators, settling basins, etc.
Pollutant Control Approach: Provide maintenance and cleaning of
debris, sediments, and oil from stormwatec collection, conveyance, and
treatment systems to obtain proper operation.
Applicable Operational BMPs:
Maintain stormwatec treatment facilities according to the O & M
~
procedures presented in Section 4.6 of Volume V in addition to Ihe
following BMPs:
• Inspect and clean treatment BMPs, eonveynnce systems, and catch
basins as needed, and determine whether improvements in O & M are
needed.
• Promptly repair any deterioration threatening the structural integrity of
the facilities. These include replacement ofclean-out gates, catch
basin lids, and rock in emergency spillways.
• Ensure [hat storm sewer capacities are no[ exceeded and that heavy
sediment discharges to [he sewer system are prevented.
• Regularly remove debris and sludge from BMPs used for peak-rate
control, treatment, etc. and discharge to a sanitary sewer if approved
by the sewer authority, or truck to a local or state government
approved disposal site.
• Clean catch basins when the depth of deposits reaches 60 percent of
the sump depth as measured from the bottom of basin to the invert of
the lowest pipe into or out of the basin. However, in no case should
there be less than six inches clearance from the debris surface [o the
invert of the lowest pipe. Some catch basins (for example, WSDOT
Type IL basins) may have as little as 12 inches sediment storage
below the invert. These catch basins will need more frequent
inspection and cleaning to prevent scouring. Where these catch basins
are part of a stormwatec collection and treatment system, the system
owner/operator may choose to concentrate maintenance efforts on
downstream control devices as part of a systems approach.
2-40 Volume IV -Source Con(ra18MPS August 2001
• Clean woody debris in a catch basin as frequently as needed ro ensure
proper operation of the catchbasin.
• Post warning signs; "Dump No Waste -Drains to Ground Water,"
"Streams," "Lakes," or emboss on or adjacent to all storm drain inlets
where practical.
• Disposal of sediments and liquids from [he catch basins must comply
with "Recommendations for Management of Street Wastes' described
in Appendix IV-G of [his volume.
Additional Applicable BMPs: Select additional applicable BMPs from
this chapter depending on the pollutant sources and activities conducted at
[he facility. Those BMPs include:
• BMPs for Soil Erosion and Sediment Control at Industrial Sites
• BMPs for Storage of Liquid, Food Waste, or Dangerous Waste
Containers
• BMPs for Spills of Oil and Hazardous Substances
• BMPs for Illicit Connections to Storm Drains
BMPs for Urban Streets.
August 2001 Volume IV -Source Control BMPs 2-41