Prelim Drain & Erosion Controlr
BEEHIVE MANAGEMENT
GROUP, INC.
EASTHAVEN VILLA ADDITION
311 CULLENS ROAD, NORTHWEST
YELM, WA 98597
DRAINAGE AND EROSION CONTROL
PRELIMINARY REPORT
JULY 11, 2002
~ Easthaven Assisted Care Facility Addition, Yelm, WA PRELIMINARY REPORT
PROJECT INFORMATION
Project: Easthaven Assisted Care Facility Addition
Prepared: 7-10-02
Prepared For: Easthaven Villa, LLC
311 Cullens Road NW
Yelm, WA 98597
503-357-3793
Contact: Marvin Pratt
REVIEWING AGENCY
Jurisdiction: City of Yelm
Project Number: []
Project Contact: Dave Gibson
PROJECT ENGINEER
Prepared By: MC Squared, Inc.
1235 E. 4~' Avenue Suite 101
Olympia, WA 98506
PH. 360-754-9339
FAX 360-352-2044
Project Contact: Mark J. Leingang, PE
Project Number: 22234-C
File Name/Number: m:projects/falter architecture/easthaven/documents
PROJECT ENGINEER'S CERTIFICATION
I hereby certify that this Preliminary Drainage Report for the Easthaven Assisted Care Facility
Addition in Yelm, WA has been prepared by me or under by supervision and meets the intent of
the City of Yelm Development Guidelines unless noted otherwise, and normal standards of
engineering practice. I understand that the City of Yelm does not and will not assume liability for
the sufficiency, suitability, or performance of drainage facilities designed for this development.
MC Squared, Inc.
j•a~~
c~ ~-
~~L
pig -11
1
~ Ea~thaven Assisted Care Facility Addition. Yelm. WA PRELIMINARY REPORT
Table of Contents
Part I Drainage Report
SECTION 1 - EXISTING CONDITIONS 3
SECTION 2 - PROJECT DESCRIPTION 4
SECTION 3 - INFILTRATION RATES/SOILS REPORT (>
SECTION 4 - WELLS & SEPTIC SYSTEMS
SECTION 5 - FUEL TANKS
SECTION 6 - SUB-BASIN DESCRIPTION
SECTION 7 - ANALYSIS OF 100-YEAR FLOOD '7
SECTION 8 - AESTHETIC CONSIDERATIONS FOR STORMWATER FACILITIES 7
SECTION 9 - DOWNSTREAM CONSIDERATIONS 7
SECTION 10 - COVENANTS, DEDICATIONS, EASEMENTS 7
SECTION 11 - PROPERTY OWNERS ASSOCIATION ARTICLES OF INCORPORATION 7
Part II Erosion Control Report
SECTION 1 - CONSTRUCTION SEQUENCE AND PROCEDURE 8
SECTION 2 - TRAPPING SEDIMENT g
SECTION 3 - PERMANENT EROSION CONTROL & SITE RESTORATION 9
SECTION 4 - GEOTECHNICAL ANALYSIS AND REPORT 9
SECTION 5 - INSPECTION SEQUENCE 9
SECTION 6 - CONTROL OF POLLUTANTS OTHER TRAN SEDIMENTS 10
Part III Maintenance Plan
SECTION 1 - REQUIRED MAINTENANCE 13
SECTION 2 - RESPONSIBLE ORGANIZATION x
SECTION 3 - VEGETATION MANAGEMENT PLAN x
SECTION 4 - SOURCE CONTROL x
Appendices
Appendix I Drainage Calculations Pending
Appendix II Soils Report/SCS Soils Map and Description
Appendix III Vicinity Map
Appendix IV STORMFILTER® Product/Maintenance Information
Appendix V Thurston County GeoData Query Results (Excerpt)
Appendix VI Prelimary Drainage and Erosion Control Plan
MC Squared, Inc. 2
~, Ea~thaven Assisted Care Facility Addition, Yelm, WA PRELIMINARY REPORT
The format of this report follows the outline provided in the Drainage Design and Erosion
Control Manual (DDECM) for Thurston County. DOE Standards have been used for the design,
however.
SECTION 1 -EXISTING CONDITIONS
The 0.61-acre site is located within the City of Yelm, immediately southwest of the existing
Easthaven Villa Site. The site is currently used for growing Christmas trees and has recently
been surveyed for this addition.
There is no significant off-site flow tributary to the site; a minor portion of the land to the west
gently slopes to the site, and surface water can be assumed to sheet flow onto the property. The
amount of surface water is limited however because the soils are very well drained gravels and
sands. Soils on site are Spanaway gravelly sandy loam according to the Thurston County Soil
Survey published by the Soils Conservation Service.
There is an existing pond that serves as an infiltration facility for the existing assisted living
facility. It is not adequately sized to handle the addition. The conveyance system to the pond
will not handle the additional flows from the new addition.
A new system will be designed.
The project site is located in an aquifer sensitive area. We will need to provide treatment of the
runoff prior to infiltration. This project will comply with the intent of the stormwater treatment
requirements of the City of Yelm development guidelines.
MC Squared, Inc. 3
Eacthaven Assisted Care Facility Addition Yelm WA PRELIMINARY REPORT
SECTION 2 -PROJECT DESCRIPTION
Project Proponent: Easthaven Villa, LLC
311 Cullens Road NW
Yelm, WA 98597
Marvin Pratt 503-357-3793
Total Project Area: ±0.61 Acres
Site Address: 311 Cullens Road NW
Yelm, WA 98597
Required Permits: Grading, utility, paving, building, plumbing, mechanical,
electrical, etc.
Sec/Township/Range: NE '/a Section 24, Township 17 North, Range 1 East, W.M.,
Thurston County, WA
Zoning: Commercial
The proponent proposes to add a 12,600 sf addition to an existing assisted care facility and
parking for approximately 11 cars. Frontage improvements on Cullens Road are to be included
for this project.
The owner proposes to add a stormwater system for collection, conveyance, treatment and
discharge of runoff to an underground infiltration gallery in the new drive on the developed
project site. The system will be enhanced to accommodate landscape islands and new drain lines
for roof and courtyard runoff.
Site development will be constructed in two phases. The first phase will include erosion control
measures, site clearing, and demolition of asphalt, grading, storm drainage improvements, and
underground utilities such as power, cable, water, sewer and telecommunications. The second
phase will include construction of the building, paving, site concrete work, landscaping,
pavement restoration, seal coating, and striping.
Site development will increase the total impervious area. Currently, small trees, with trunk
diameter less than 12 inches, cover the entire site. Development will include creation of
approximately 0.22 acres of access road and parking, which is treatable impervious surface.
There will be approximately 0.10 acres of perimeter landscaping, and building area landscaping.
The building will add approximately 0.29 acres of clean impervious surface. This will increase
the site's impervious area to approximately 0.51 acres.
MC Squared, Inc. 4
j Ea~thaven Assisted Care Facility Addition, Yelm, WA PRELIMINARY REPORT
Development Coverage Summary
Impervious Roof Area:
Impervious Paved/Concrete Area:
Landscaped or Pervious Area:
Totals
A. Stormwater Treatment
Existing Proposed
0 ac ±0.29 ac
0 ac ±0.22ac
0.61 ac ±0.10 ac
±0.61 ac ±0.61 ac
The effect of lack of relief, lack of area and tight setbacks combine to eliminate several
treatment BMPs; the following systems have been considered for this site:
Bioswale Option: The proposed site layout and lack of topographic relief across
The site makes it difficult to achieve significant success with biofiltration swales
or filter strips. This BMP was not explored for the project.
Wet Pond Option: This is not a feasible treatment measure for this site, because a
suitable area is not available to accommodate the pond's 3-foot permanent pool
depth, 3:1 length to width ratio, 3:1 side slopes, and the depth required for site
drainage. This BMP was not explored for the project.
Stormfilter®Option: This product, distributed by Stormwater Management, Inc.
is an appropriate treatment BMP for this project.
A single Stormfilter®catch basin CBSF-3-SD unit would treat the 6-month flow
rate of 0.20 cfs. The unit could be placed in-line with the proposed 8-inch storm
drain, just upstream of the infiltration gallery.
B.
C.
Preferred Treatment Alternative:
After considering the treatment options above, we have determined that the best option is
the Stormfilter®option. We recommend this to City of Yelm staff as the most practical
and environmentally beneficial option.
Stormwater Storage:
Due to the excessively drained soils, the infiltration gallery will be sized to serve as both
detention and disposal. Both will occur on site. All stormwater runoff will be infiltrated
on site. There will not be a release offsite.
Roof Runoff:
Roof runoff from the proposed addition will be tight lined to drywells for infiltration.
The roof leaders will not be combined with the proposed parking/asphalt treatable
infiltration system.
MC Squared, Inc. 5
Ea;thaven Assisted Care Facility Addition Yelm WA PRELIMINARY REPORT
D. Landscape Area:
In general, parking lot landscape area runoff will sheet flow to driveway and parking
areas for collection in the site's stormwater system. Some areas adjacent to the buildings
will require yard drains to collect runoff for discharge to the drywell system mentioned
above for roof drains.
SECTION 3 -INFILTRATION RATES/SOILS REPORT
The Soil Conservation Service (SCS) soil survey of Thurston County classifies the onsite soils as
"Spanaway Gravelly Sandy Loam, 0 to 3 percent slopes".
A typical soil profile is described by SCS as follows:
"These deep, somewhat excessively drained soils are on terraces. It formed in glacial outwash
and volcanic ash.
For the SCS soils description and map, see Appendix II.
SECTION 4 -WELLS & SEPTIC SYSTEMS
The owner is not aware of any abandoned or existing wells on-site. Water service for the
proposed project will be provided by the City of Yelm.
The existing building has a STEP system that serves its sanitary sewer needs. No abandoned or
existing septic systems were identified on-site for the property utilized for the addition during
MC Squared, Inc.'s site investigation. The addition's sanitary sewer needs will be handled by a
STEP system. Sewer service will be provided by the City of Yelm.
SECTION 5 -FUEL TANKS
No fuel tanks were located during our site inspection. The owner is not aware of any existing
tanks in the project area.
SECTION 6 -SUB-BASIN DESCRIPTION
The site is situated within the City of Yelm commercial district.
A minor amount of off-site runoff from the west is tributary to the site. However, given the
permeable soil, any runoff from the west is assumed to be negligible. The other existing drainage
conditions and systems are detailed in Section 1 -Existing Conditions and is shown on Sheet C-
2 ofthe project civil engineering drawings, (enclosed in Appendix I).
No hazardous materials are expected to be handled or transported within the site other than
cleaning/maintenance products associated with janitorial operations.
MC Squared, Inc. g
Easthaven Assisted Care Facility Addition Yelm WA PRELIMINARY REPORT
SECTION 7 -ANALYSIS OF 100-YEAR FLOOD
Preliminary research shows that the site is not in a 100-year flood hazard area.
SECTION 8 -AESTHETIC CONSIDERATIONS FOR STORMWATER FACILITIES
All pervious areas will be vegetated and landscaped to provide an aesthetically pleasing
environment per the requirements of the City. Landscaping plans have been prepared by the
landscape architectural design firm of [to be determined]
SECTION 9 -DOWNSTREAM CONSIDERATIONS
Runoff from the site will be infiltrated on site. There are not any downstream impacts
anticipated.
SECTION 10 -COVENANTS, DEDICATIONS, EASEMENTS
On-site storm lines, catch basins, and roof drains will require routine maintenance. A
maintenance schedule is included in Part III of this report. The owner's maintenance crews will
maintain parking lot storm piping systems and catch basins. The building owners will maintain
building roof drain lines.
SECTION 11-PROPERTY OWNERS ASSOCIATION ARTICLES OF
INCORPORATION
In light of the commercial nature of this project, special covenants covering landscape,
maintenance, signage, stormwater and site maintenance will not be applicable. The building
owner will perform maintenance of storm drainage facilities. The building owners will perform
maintenance of the roof drain lines and courtyard drains adjacent to the building.
MC Squared, Inc. 7
Easthaven Assisted Care Facility Addition. Yelm WA PRELIMINARY REPORT
SECTION 1 -CONSTRUCTION SEQUENCE AND PROCEDURE
Development of the property will include site grading and erosion control measures designed to
contain silt and soil within the project boundaries during construction until permanent erosion
control is in place. Erosion sedimentation control will be achieved by a combination of
structural/vegetative cover measures and construction practices tailored to fit the site.
Best Construction Management Practices (BMPs) will be employed to properly demolish, clear
and grade the site and to schedule construction activities. Before any construction begins on-site,
erosion control facilities shall first be installed. The contractor shall refer to the erosion control
plans. The planned construction sequence is as follows:
1. Schedule preconstruction meeting with City..
2. Install temporary gravel construction entrance (as needed).
3. Install inlet protection for existing catch basins per Thurston County DDECM details 38
and 139 as shown on civil plans.
4. Install filter fabric fence (as needed).
5. Perform asphalt demolition, clearing, earthwork operations, and foundation excavation.
6. Install storm drainage improvements; install or relocate other utility lines.
7. Install inlet protection for all new on-site catch basins.
8. Hydroseed or cover all exposed areas subject to erosion, i.e., steep slopes, landscape
islands, etc.
9. Designate an area for washing of equipment and concrete trucks to control wash down
runoff and eliminate entry into storm drainage systems.
10. Complete building and site improvements.
11. Remove temporary erosion control facilities once site landscaping is stabilized.
SECTION 2 -TRAPPING SEDIMENT
The on-site soils belong to the Spanaway soil group and have slight erosion potential according
to the SCS. If necessary, a stabilized construction entrance shall be installed at a single entry
point to the site to prevent vehicles from tracking soil away from the disturbed areas. If sediment
is tracked off-site, sediment shall, on a daily basis, be swept or shoveled from paved surfaces and
not washed into the storm system.
Unless the City inspector approves otherwise, the contractor shall not be allowed to leave
disturbed areas greater than 5,000 sf, that are to be left unworked for more than 30 days
uncovered during the rainy season from November 1 through March 31. Mulch, sodding or
plastic covering will be used to prevent erosion in these areas.
MC Squared, Inc. g
Easthaven Assisted Care Facility Addition, Yelm, WA PRELIMINARY REPORT
During construction, the contractor may also be required to install filter fabric fencing, as
needed, and/or as directed by the engineer, or city inspector.
SECTION 3 -PERMANENT EROSION CONTROL & SITE RESTORATION
All disturbed areas will be paved, covered with a building or landscaped with ground
cover, shrubbery or trees.
SECTION 4 - GEOTECHNICAL ANALYSIS AND REPORT
A geo-technical engineering study was not prepared to address site work issues. No on-
site slopes exceed 15%. An infiltration test is pending for stormwater infiltration system design.
SECTION 5 -INSPECTION SEQUENCE
In addition to the normal City inspections, the Project Engineer shall inspect the facilities related
to stormwater treatment, erosion control, storage and conveyance during construction. At a
minimum, the following items shall be inspected at the time specified:
The erosion control facilities shall be inspected before the start of clearing and grading to
ensure the following structures are in place:
a. Construction Entrance (if installed)
b. Filter Fabric Fences (if installed)
c. Catch Basin Inlet Protection
2. The conveyance systems shall be inspected after construction of the facility, but before
the project is completed to ensure the following are in working order:
a. Parking Lot Surface Drainage
b. Storm Lines, Catch Basins and Yard Drains
3. The permanent site restoration measures shall be inspected after landscaping is
completed.
A final inspection shall be performed to verify final grades, setting of control structures and all
necessary information to complete Thurston County's Engineer's Construction Inspection Report
Form and Commercial Agreement To Maintain Stormwater Facilities. These documents must
be completed prior to final City construction approval.
MC Squared, Inc. g
Easthaven Assisted Care Facility Addition, Yelm, WA PRELIMINARY REPORT
SECTION 6 -CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS
Washout from concrete trucks shall not be dumped into the storm drain, or onto soil or
pavement, which carries stormwater runoff. It can be dumped into a designated area to be later
backfilled or hardened and broken up for disposal into a dumpster. The Contractor will be
required to designate a wash down area for equipment and concrete trucks.
MC Squared, Inc. 10
Easthaven Assisted Care Facility Addition. Yelm. WA PRELIMINARY REPORT
INSTRUCTIONS
The following pages contain maintenance needs for most of the components that aze part of the
site drainage system. Advise the City of Yelm if there are any components that are missing from
these pages. Ignore the requirements that do not apply to the system. Plan to complete a
checklist for all system components on the following schedule:
1) Monthly from November through April.
2) Once in late summer (preferable September).
3) After any major storm (use "1" in 24 hours as a guideline).
Using photocopies of these pages, check off the problems you looked for each time an inspection
was performed. Add comments on problems found and actions taken. Keep these "checked"
sheets in your files, as they will be used to write your annual report (due in May). Some items do
not need to be looked at every time an inspection is done. Use the suggested frequency at the left
of each item as a guideline for your inspection.
Call the City for technical assistance if needed.
MC Squared, Inc. 11
Easthaven Assisted Care Facility Addition, Yelm. WA PRELIMINARY REPORT
Inspection-Period:
MAINTENANCE PROGRAM COVER SHEET
Number of Sheets Attached:
Date Inspected:
Name of Inspector:
Inspector's Signature:
MC Squared, Inc. 12
Easthaven Assisted Care Facility Addition, Yelm, WA PRELIMINARY REPORT
SECTION 1-REQUIRED MAINTENANCE
The drainage facilities will require occasional maintenance. The following general requirements
are the minimum requirements as set forth in the Drainage Design and Erosion Control Manual
of Thurston County. The required maintenance for storm drainage facilities and frequency of
maintenance are as follows:
Maintenance Checklist for Conveyance Systems (Pipes and Swales)
MC Squared, Inc. 13
APPENDIX 1
DRAINAGE CALCULATIONS
(PENDING)
APPENDIX 11
BRADLEY-NOBLE SOILS/INFILTRATION
REPORT
(PENDING)
;ton County, Washington
jed areas make up about 10 percent of the total
ige.
rmeability is moderately rapid in the Spana soil.
able water capacity is moderate. Effective rooting
is 20 to 40 inches. A seasonal high water table is
lepth of about t 2 to 36 inches from November to
Runoff is slow, and the hazard of water erosion is
st areas are used as hayland and pasture. This
;suited to hay and pasture. The main limitations
e seasonal high water table and the moderate
ble water capacity. Proper stocking rates, pasture
~n, and restricted grazing during wet periods help
~p the pasture in good condition and protect the
om erosion. Rotation grazing helps to maintain the
~ of forage. Periodic mowing helps to maintain
m growth, discourages selective grazing, and
GIs weeds. In most years irrigation is needed for
ium production. Sprinkler irrigation is the best
~d of applying water. The amount of water applied
i be sufficient to wet the root zone but small
~h to minimize the leaching of plant nutrients.
'w areas are used as woodland. On the basis of a
gar site curve, the estimated site index for
as-fir is 144. On the basis of a 50-year site curve,
10. The estimated growth rate of an unmanaged,
aged stand of Douglas-fir is 150 cubic feet per
per year at 60 years of age.
main limitation affecting the harvesting of timber
muddiness caused by seasonal wetness. Use of
ad and tracked equipment when the soil is wet
in ruts and soil compaction. Unsurfaced roads
cid trails are soft and can be impassable when
ogging roads require suitable surfacing material
~r-round use. Rounded pebbles and cobbles for
onstruction are readily available on this unit. The
gal high water table limits the use of equipment to
rinds. Disturbance of the protective layer of duff
minimized by the careful use of wheeled and
d equipment.
idling establishment is the main concern in the
:tion of timber. Reforestation can be
plished by planting Douglas-fir seedlings. If the
includes seed trees, natural reforestation by red
occurs periodically in cutover areas. The seasonal
ater table inhibits root respiration and thus results
e seedling mortality. When openings are made in
ropy, invading brushy plants can prevent the
shment of planted Douglas-fir seedlings.
imon forest understory plants are cascade
~-grape, salal, vine maple, western brackenfern,
~egon white oak.
89
This map unit is in capability subclass Illw.
110-Spanaway gravelly sandv loam. 0 to 3 ~'a
percent sloops. 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 t 50 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 hav anti nact~ira is tha
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 to
maintain uniform growth, discourages selective grazing,
and 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 to 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.
;,
'i
r
~~SHINGTON - SHEET NUMBER 2~1
,.
. -.+'~+.5' ~' -..
nd
~r~
'~~Y
iI~
t
V
r~`t
~(
W~.
`
~i^IiYW
~'~ `'r
-
r y, , ;
~
._ y' ,k_tl
`Ck~
1
r ~ ,,
~
~ ~
.
,
G j'
j" Y '~' y
uw m.} Hf
~
~ :~
~~ e
~
rr
a
"
~ .. S.
4'!, :~
•~, .ran Eti
KIL~ME~EFtS
~ ,~E~:
t.S..~;;,,.
y ~.+
~~;~
P~J~~-r'
~ti ~
.~ , - dl l , ,rs ~
~fs
~`~
-.~~ =..'~Y, ~-.
.:.~~_
~t_ ::
105
r P.
G t
_ ~ ~
mow'
.:~•1 .4~! rc~~6
'~R. ."'~5`~~
i>.. s°
~~y #',.
~' .
APPENDIX 111
VICINITY MAP
APPENDIX IV
STORMFILTER CBSF-3-SD PRODUCT AND
MAINTENANCE INFORMATION
Selecting and Sizing your StormFilter
Catch Basin StormFilter
Overview
The Catch Basin StormFilterT"" (CBSF) consists of a
multi-chamber steel, concrete, or plastic catch basin
unit that can contain up to four StormFilter '
cartridges. The CBSF is offered both as a standard
and as a deep unit.
The CBSF is installed flush with the finished grade
and is applicable for both constrained lot and retrofit
applications. It can also be fitted with an inlet pipe
for roof leaders or similar applications.
The CBSF unit treats peak water quality design
flows up to 0.13 cfs, coupled with an internal weir
overflow capacity of 1.0 cfs for the standard unit and
up to 3.0 cfs for the deep unit.
'Design operation
The CBSF is installed as the primary receiver of
runoff, similar to a standard, grated catch basin. The
steel and concrete CBSF units each have atraffic-
bearing, H-20 lid that allows the filter to be installed
in parking lots, and for all practical purposes, take up
no land area. Plastic Catch Basin units can be used
in landscaped areas and for other non-traffic bearing
applications
The CBSF consists of a sumped inlet chamber and
a cartridge chamber(s). Runoff enters the sumped
inlet chamber either by sheet flow from a paved
surface or from an inlet pipe discharging directly to
the unit vault. The inlet chamber is equipped with an
internal baffle, which traps debris and floating oil and
grease, and an overflow weir. While in the inlet
chamber, heavier solids are allowed to settle into the
deep sump, while lighter solids and soluble
pollutants are directed under the baffle and into the
cartridge chamber through a port between the baffle
and the overflow weir. Once in the cartridge
chamber, polluted water ponds and percolates
horizontally through the media in the filter cartridges.
Treated water collects in the cartridge's center tube
from where it is directed by an under-drain manifold
~~
to the outlet pipe on the downstream side of the
overflow weir and discharged.
When flows into the CBSF exceed the water quality
design value, excess water spills over the overflow
weir, bypassing the cartridge bay, and discharges to
the outlet pipe.
Applications
The CBSF is particularly useful where small flows
are being treated or for sites that are flat and there is
little available hydraulic head to spare. The unit is
ideal for applications in which standard catch basins
are to be used. Both water quality and catchment
issues can be resolved with the use of the CBSF.
Retro-Fit
The retrofit market has many possible applications
for the CBSF. The CBSF can be installed by
replacing an existing catch basin without having to
"chase the grade," thus reducing the high cost of
re-piping the storm system.
Special Considerations
When designing the CBSF into your system, you
should consider the following:
• Additional information on the non-traffic bearing
plastic Catch Basin units is available from the
Stormwater Management Engineering
Department.
• If an inlet pipe is used, a deep unit is
recommended in order to minimize the effect of
standing water in the upstream system.
• Standing water in the inlet bay may lead to
standing water in the inlet pipe.
• Additional sorbent and oil treatment components
are available for the CBSF. See the "Other
Products' section for more information.
I SF
T 800.548.4667 F 800.561.1271 W stormwaterinc.com SF-33
Selecting and Sizing your StormFilter
Sizing the Catch Basin StormFilter
To determine the size of your Catch Basin StormFilter.
1. Determine the number of cartridges required to treat your water quality flow rate. See "Determining
the number of StormFilter cartridges" for instructions on how to calculate this value.
2. Determine the type of material that you want to use: steel, concrete, or plastic. Refer to Table 3 and
corresponding footnotes to determine the configurations offered for each material.
3. Locate the number of required cartridges in the Catch Basin configuration options table below.
4. Use the corresponding StormFilter model number, dimensions, and configuration option for your
Catch Basin size.
Important: Be sure to specify standard or deep unit.
Table 3. Catch Basin StormFilter configuration options'' °
StormFilter Number of Outside Approximate Configuration Options `
Model Cartridges Dimensions ~ Weight (Ibs)
Standard Deep
CBSF1' 1 L,R 4'9" x 2'S" 650 / 775 ~b b~
b b
~' R
CBSF2'~d 2 7'1" x 2'S" 950 / 1150
CBSF3 3 L,R 8'10" x 2'S" 1250 / 1500
b _
OO O O OO
b b
L R
CBSF4 4 10'8" x 2'S" 1550 / 1850 OO OO
b
' Concrete catch basin units are available in the CBSF1-L configuration only; plastic catch basin units are available
with 1 or 2 cartridges only; steel catch basin units are available in all configurations. If anther configuration or
more information is needed, contact the Stormwater Management Engineering Department.
b The "b" symbol on the configuration drawings denotes possible inlet pipe locations. Inlet pipes are recommended on deep units
only. The inlet pipe can o~ be attached to the grated chamber.
` Inlet pipes installed lower than 1 foot below the grade (standard units; 1'10', deep units) will be partially to completely
submerged.
° 2-cartridge catch basin units can be designed with a left or right configuration if needed. Contact the Stormwater Management
Engineering Department for details.
~F-34 T 800.548.4667 F 800.561.1271 W stormwaterinc.com
Using the flow-based method
To determine the number of StormFilter cartridges needed for a highly impervious site
(>_ 70% impervious):
1. Calculate the peak flow rate from the water quality storm (Q~a~) for your site using
the approved hydrologic models established by your local agency. If there are no
agency guidelines, we recommend using the Santa Barbara Urban Hydrograph
Method.
2. Calculate the number of cartridges required to treat the peak water quality flow rate
(Nn°r„) for your site. .
Know = Qveat (449 gpm/cfs / Qcart 9Pm/grt)
Notes:
• Assume Q~rt = 15 yprrvcan, which is the maximum flow rate that an individual
cartridge can treat. In some areas or situations, cartridges with a flow rate other
than 15 gPm may be required, resulting in a different Q~rt value.
• If the number of cartridges is not a whole number, round the number of cartridges
up to the next whole number.
APPENDIX V
THURSTON COUNTY GEODATA
QUERY RESULTS
EXCERPTS
Thurston GeoDATA Center/Interactive Map
Thurston GeoData Center
Click here to view results of search.
Page 1 of 3
Click on Map to:
~' Zoam In
~' Zoom Out~~
Zoom Factor: t=___J
~ escribe a Parcel
~ !:;escnhe a 1_aver
~ N(easure Distance
~ A,leasure Area
~.: .
Search By:
.Address: Do not use road suffix (ie St. or Rd.}
~~Street Number (ie 921):
C __-Street Name (ie 5tn er Evergreen Park)
EOuadrant (ie NW cr SE):
11 digit Parcel Number:
Section (ie 05182w}:
~~~Survey Target#?Name:
~~CAPCOM Grid# (ie V-14)'
R~`~i~.~~, ~ i
~.:
Return to top of page
~ Display Aerial Photos
~ Display Parcel Text
Show other ma la ers?
none
v~,
Label Parcels With? Parcel Number
1~s~essor ~~ta
Thurston GeoDATA Center/Interactive Map
OWNER: EAST HAVEN VILLA LLC (Due to space restrictions
only 1 owner is listed)
Address: 311 CULLENS ST NW
City: YELM
State: WA, 98597
Parcel#: 21724140502
Site Address: 311 CULLENS ST NW
Site City: YELM
Site Zip: 98597
Section: s24171E
Legal Description: 24-17-1E SE NE BEG AT NE COR SE NE W
ALG NLN 335.86F TO POB 536-29 -30-W 364.21F S53-
Usecode: 17 - INST-LODGING
Tax Code Area: 170
Taxable: Y
Property Type: COM
Total Acres: 2.18
Land Value: 104900
Building Value: 1928700
Total Value: 2033600
Current Use: N
Exemptions: None
Last Sale Recorded #:
Last Sale Date: Unknown
Last Sale Price: Unknown
Transaction includes additional properties: Unknown
Last Sellers Name: Unknown
Return to top of page
Page 2 of 3
~l`el~ld~ ~dt~l
Thurston GeoDATA Center/Interactive Map
Wetlands: No
Floodzone: No
Flood of 1996: Unknown
Winter Flooding of 1996: No
High Groundwater Flood Hazards: Unknown
Salmon Creek Basin: No
1999 Carlyon Beach Landslide Hazard: None
Zoning: R-6 or C-1
Historic Site: No
Jurisdiction: YELM
Stormwater Rate: No
No Shooting Zone: No
Animal Control Zone: Yes
Weed Containment Area: No
Steep Slopes: No
Sensitive Areas: No
DNR Natural Heritage Data: No
Critical Buffers: 200' Wetland
Shoreline Management: No
Waterbody & Wetland Buffers: Yes
Wellhead Prot. Area: Unknown
Area of Groundwater Concern: No
Elevated Nitrates: No
Soil Type: Spanaway gravelly sandy loam, 0 to 3~ slopes
Hydric Soil: No
Watershed: YELM CREEK
Water Service Area: YELM, CITY OF
School Service District: YELM
Fire Response District: YELM
Planning Region: 3
Census Tract
Page 3 of 3
County Ordinances ~ Data Descriptions ~ Help ~ Whnt's New ~ TGC Home ~ Hel ful
Info ~ Assessor Questions
Ecology Shoreline Photographs ~ Thurston County GPS Bnsestntion
,~. . .
y..:
`~ °~
You are visitor 3fi5,55~ with map request 5,008,742 since. Apri124, 1998
~~.Af2~l~;~: ~'aircel 1):~ta was last updated on Sunda-, ,Aug 4, 2002
DISCLAIMER: Thurston GeoData Center makes no guarantee of data
accuracy and assumes no liability for the data represented here.
If questions arise regarding accuracy please contact Thurston County staff.
Please do not bookmark this page! Bookmark our home page instead!
Thurston GeoDATA Center/Interactive Map Page 1 of 1
• ~ .-
Scale: Approx. lInch = 100 Feet 8/7/2002 12:21:45 PM
Map Produced By: Thurston GEODATA Center's Internet Map Server
APPENDIX VI
PRELIMINARY DRAINAGE AND
EROSION CONTROL PLAN