Preliminary Drainage
Cullens Road Plat Preliminary
Drainage Report
Prepared for
D & D Associates, LLC
Donald Findlay
PO Box 310
Gig Harbor, WA 98335
(253) 851-3600
Prepared by
Parametrix
8770 Talton Lane NE
Lacey, WA 98516-6641
(360) 459-3609
www.parametrix.com
December, 2004
Project No. 257-4520-002
Cullens Road Plat Preliminary
Drainage Report
Prepared for
D & D Associates, LLC
Donald Findlay
PO Box 310
Gig Harbor, WA 98335
(253)851-3600
Prepared by
Parametrix
8770 Tallon Lane NE
Lacey, WA 98516-6641
(360) 459-3609
www.parametrix.com
December, 2004
Project No. 257-4520-002
CERTIFICATE OF ENGINEER
The technical material and data contained in this document were prepared under the supervision and
direction of the undersigned, whose seal, as a professional engineer licensed to practice as such, is affixed
below.
~~
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SIpNRl.. ~CC'
ex~-~~s QB/06/nS
Approved by~ arc Gusta son, P.E.
D & D Associates, LLC 257-4520-002
Cullens Road Plat DecemGer, 2004
Preliminary Drainage Report
Prepared by Daniel J. Osier, P.E.
TABLE OF CONTENTS
1. STORM DRAINAGE REPORT .........................................................................................................1-1
1.1 PROPOSED PROJECT DESCRIPTION ............................................................................1-1
1.1.1 Stormwater Treatment ............................................................................................1-2
1.1.2 Stormwater Storage :............................................................................................... l-2
1.1.3 Roof Runoff :........................................................................................................... l -2
1.2 EXISTING CONDITIONS ................................................................................................. l-3
1.3 INFII,TRATION RATES/SOILS REPORT .......................................................................1-3
1.4 WELLS AND SEPTIC SYSTEMS .....................................................................................1-3
1.5 FUEL TANKS .....................................................................................................................1-3
1.6 SUB-BASIN DESCRIPTION .............................................................................................1-3
1.7 ANALYSIS OF 100 YEAR FLOOD ..................................................................................1-4
1.8 AESTHETIC CONSIDERATIONS FOR STORMWATER FACILITIES ........................1-4
1.9 DOWNSTREAM ANALYSIS AND FACILITY SIZING .................................................1-4
1.10 COVENANTS, DEDICATIONS, EASEMENTS ...............................................................1-4
1.11 PROPERTY OWNERS ASSOCIATION ARTICLES OF INCORPORATION ................ l-4
2. EROSION CONTROL REPORT ...................................................................................................... 2-1
2.1 CONSTRUCTION SEQUENCE AND PROCEDURE ...................................................... 2-1
2.2 TRAPPING SEDIMENT .................................................................................................... 2-1
2.3 PERMANENT EROSION CONTROL & SITE RESTORATION .................................... 2-2
2.4 GEOTECHNICAL ANALYSIS AND REPORT ................................................................ 2-2
2.5 INSPECTION SEQUENCE ................................................................................................ 2-2
2.6 CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS ........................................ 2-3
3. MAINTENANCE PLAN .................................................................................................................... 3-1
3.1 REQUIRED MAINTENANCE ........................................................................................... 3-I
3.2 RESPONSIBLE ORGANIZATION ................................................................................. 3-15
3.3 VEGETATION MANAGEMENT PLAN ........................................................................ 3-15
3.4 SOURCE CONTROL ........................................................................................................3-15
APPENDICES
I Preliminary Drainage Calculations
II SCS Soils Map & Soils Report
III Vicinity Map
N FEMA Firm Map
V Facility Summary Forms
VI Residential Maintenance Agreement
VII Preliminary Grading, Storm Drainage and Erosion Control Plan
D & D Associates, LLC 257-4520-002
Cullens Roa~f Plat 1 DecemGer, 2004
Preliminary Drninage Report
1. STORM DRAINAGE REPORT
1.1 PROPOSED PROJECT DESCRIPTION
The format of this report follows the outline provided in the Thurston County Drainage Design and
Erosion Control Manual (DDECM), 1994 Edition.
Project Proponent: Don Findlay
DND Associates
POBox310
Gig Harbor, WA 98355
(253) 851-3600
Parcel Numbers: 21724110100 and 21724110101
Total Site Area: 6.58 ac
Zoned: Medium Density Residential (R-6)
Site Address: 9301 and 9329 SE Cullens Road
Required Permits: Grading, Utility, Building, Plumbing, Electrical,
Preliminary Plat and Final Plat approval
Section, Township, Range: Section 24, Township 17, Range 1 East, W.M.
Thurston County, Washington
The site is located in the City of Yelm and is bordered on the east by Cullens Road SE, and to the south,
west, and north by single family homes and vacant land.
The proposal is to develop a 30-lot single family residential subdivision. The development will be
constructed in one phase and will be served by the City of Yelm water and S.T.E.P. sewer.
One access is proposed from Cullens Road. An additional temporary emergency vehicle access will be
provided along the south property line. New internal roads will be constructed to City of Yelm's
standards to serve the new residences.
D & D Associates, LLC 257-4520-OD2
Cullens Road Plat 1-1 December, 2004
Preliminary Drainage Report
For Stormwater design purposes, the entire proposed development is considered one drainage basin.
Table 1-1. Table 1-1. Post Development Basin Summary
Basin 1
Impervious Road and Sidewalk 1.80 ac
Disturbed Pervious 3.01 ac
Off-site Impervious Road and Sidewalk 0.22 ac
Off-Site Disturbed Pervious 0.35 ac
Total 5.3 8 ac
1.1.1 Stormwater Treatment
Stormwater runoff from the roadways and sidewalks will collect in a series of catch basins and will be
piped to two wetponds in series. The wetponds are designed to exceed the 1992 DOE minimum treatment
requirements. See Appendix I for Preliminary Drainage Calculations.
Table 1-2. Treatment Area Summary
Basin ID Impervious Area Disturbed Pervious Treatment Volume Treatment Volume
Area Required Provided
Basin 1 2.02 ac 3.36 ac 11,572 cf 12,174 cf
1.1.2 Stormwater Storage:
Treated stormwater will flow from the wetponds into an infiltration pond. The infiltration pond is sized
to store the 100-year storm event and infiltrate the 100-year storm volume within 48 hours. The
infiltration pond is designed to exceed the 1992 DOE minimum storage requirements. See Appendix I for
Preliminary Drainage Calculations.
Table 1-3. Storage Capacity Summary
Basin ID Im ervious Area Disturbed Pervious Storage Required
p Area "DOE" Storage Provided
Basin 1~'~ 2.02 ac 3.36 ac 8,139 cf 8,858 cf
(~~ Based on infiltration rate of 20 inches/hour
1.1.3 Roof Runoff:
Roof runoff from each of the proposed single family residences will be tightlined to a drainrock
infiltration gallery located on each lot. The roof galleries will be installed by the builder as each home is
constructed. Each roof gallery shall be sized per Section III-3.6.6 of the 1992 DOE.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 1-2 December, 2004
Preliminary Drainage Report
1.2 EXISTING CONDITIONS
The site is located between Killion Road and Cullens Road, approximately %2 mile north of Yelm Avenue.
It is predominately an open pasture with a few clumps of large trees. There are two existing residential
houses and about ahalf--dozen outbuildings. The house located in the northwestern corner of the site is
proposed to remain, and the second house will be removed. As shown on the plan in Appendix VII,
overall site relief is about 16 feet. On-site elevation ranges from a low of 337 feet in the central area of
the property to a high of 353 feet in the northwest corner. The western third of the site lies approximately
12 feet higher than a central valley and the areas are separated by slopes approaching 20%.
Yelm Creek is located approximately 600 feet east of the site. This project is located in an aquifer
sensitive area per Thurston County comprehensive plan M-8.
1.3 INFILTRATION RATES/SOILS REPORT
The Soil Conservation Service (SCS) Soil Survey of Thurston County maps the on-site soils as Spanaway
gravelly sandy loam (0-15% slope) and Spanaway stony sandy loam (0-3% slope). This soil type features
Hydrologic Group B characteristics. Refer to Appendix II for the SCS Soils Map.
On-site soils tests completed by Pacific Rim Soil & Water confirm the SCS soils classification and
characteristics. Three on-site test pits were excavated to a depth of 13 feet.
Refer to Appendix II for the complete soils investigation, including locations of test pits.
1.4 WELLS AND SEPTIC SYSTEMS
Each of the existing residences are served by on-site wells and septic systems. The wells will be
decommissioned per Washington State Department of Ecology requirements. The on-site septic systems
shall be removed in accordance with Thurston County Department of Health Standards.
The proposed development, including the remaining existing house, will be connected to the City of Yelm
water system and STEP sewer system.
1.5 FUEL TANKS
No fuel tanks were located on site during the soils investigation. Based on information provided by the
project developer, no buried fuel tanks are known to exist. Additionally, a review of the DOE's Leaking
Underground Storage Tanks (LUST) list did not indicate any existing or abandoned fuel tanks on the
project site.
1.6 SUB-BASIN DESCRIPTION
The project is located in the Yelm Creek Basin. However, there will be no runoff from the project site for
storm events up to and including the 100-year, 24-hour storm.
Handling of hazardous materials is not anticipated on the site.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 1-3 DecemGer, 2004
Preliminary Drainage Report
1.7 ANALYSIS OF 100 YEAR FLOOD
The project does not lay adjacent to or contain a major stream on-site, therefore it has not been identified
as a flood hazard area. The FEMA Firm Map for the City of Yelm classifies the site as Zone X, which is
outside the 500-year flood plain. Refer to the FEMA Firm Map in Appendix IV.
1.8 AESTHETIC CONSIDERATIONS FOR STORMWATER FACILITIES
All stormwater tracts will be landscaped in accordance with City of Yelm standards. The stormwater
ponds have been designed to allow both aesthetic and functional characteristics.
1.9 DOWNSTREAM ANALYSIS AND FACILITY SIZING
Preliminary calculations for the project stormwater storage and treatment systems are included in
Appendix I. All stormwater runoff generated by site development will be treated, stored, and infiltrated
onsite. Therefore, a downstream analysis was deemed unnecessary.
1.10 COVENANTS, DEDICATIONS, EASEMENTS
The on-site storm drainage system, including treatment and infiltration ponds, catch basins, and pipes will
require occasional maintenance. These activities will be addressed in the plat covenants and funded
through Homeowners Association dues. A copy of the covenants will be provided by the owner to the
City of Yelm at final platting. The drainage facilities and open space areas will be maintained by the
developer until the Homeowners Association is established and can provide proper maintenance of the
facilities. Site development provides the City access to the stormwater facilities for the purposes of
inspection, maintenance, water quality monitoring and other activities as required by ordinance.
Appendix K of the DDECM will be submitted to the City prior to plan approval.
1.11 PROPERTY OWNERS ASSOCIATION ARTICLES OF INCORPORATION
A Homeowners Association shall be established to insure proper maintenance of common facilities. To
insure proper responsibility and authority to carry out necessary maintenance activities, the Homeowners
Association shall at a minimum include the following provisions:
1. Membership in the Homeowners Association will be mandatory for all lot owners.
2. The Homeowners Association shall have the power to levy fees and dues necessary to
successfully accomplish necessary activities.
3. The Homeowners Association shall have provision for the collection of attorney fees
extended in collecting delinquent assessments from lot owners.
4. Responsibility of the Homeowners Association in maintenance of common areas shall be
specifically detailed.
Assessment of Association dues.
The Covenants, Conditions and Restrictions (CC&R's} are not completed at this time and thus are not
enclosed in this report.
D & D Associates, LLC 257-9520-002
Cullens Road Plnt 1-4 December, 2004
Preliminary Drainage Report
The contractor will not be allowed to leave disturbed areas greater than 5,000 sf (that are to be left
unworked for more than twelve (12) hours) 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.
During construction, the contractor will be required to install filter fabric fencing as needed and limit site
access to one location. A rock construction entrance shall be installed. Catch basin protection shall be
provided by installing filter fabric under grates of all inlets to drainage system. All disturbed/exposed
soils shall be covered with straw or mulch to prevent erosion in these areas.
2.3 PERMANENT EROSION CONTROL & SITE RESTORATION
All disturbed areas will be landscaped with grass, natural vegetation or trees per the builder's landscaping
plans.
2.4 GEOTECHNICAL ANALYSIS AND REPORT
The proposed infiltration facilities are not located within 50' of a slope 15% or greater; therefore, a
Geotechnical Analysis and report addressing slope stability was not deemed necessary.
2.5 INSPECTION SEQUENCE
In addition to 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:
1. 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
b. Filter Fabric Fences
c. Catch Basin Filters
2. The conveyance systems will be inspected after construction of the facility, but before the
project is completed to ensure the following are in working order:
a. Road drainage
b. Catch Basins
c. Infiltration Ponds and Wet Pond
3. The permanent site restoration measures shall be inspected after landscaping is completed.
A final inspection will be performed to check final grades, settings of control structures and all necessary
information to complete Engineer's Construction Inspection Report to meet City of Yelm's requirements
for inspection and reporting.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 2-2 December, 2004
Preliminary Drainage Report
2.6 CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS
Washout from concrete trucks shall not be dumped into the storm drain, or onto soil and pavement, which
carries stormwater runoff. It will 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 washdown area for
equipment and concrete trucks.
D c~ D Associates, LLC 257-4520-002
Cullens Road Plat 2-3 December, 2004
Preliminary Drainage Report
3. MAINTENANCE PLAN
3.1 REQUIRED MAINTENANCE
The following pages contain maintenance needs for most of the components that are part of your drainage
system, as well as for some components that you may not have. Let us know if there are any components
that are missing from these pages. Ignore the requirements that do not apply to your system. You should
plan to complete a checklist for all system components on the following schedule:
M. Monthly from November through April.
A. Once in late summer (preferably September).
S. After any major storm (use 1" in 24 hours as a guideline) items marked "S" only.
Using photocopies of these pages, check off the problems you looked for each time you did an inspection.
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 suggest frequency at the left of each item as a guideline for your
inspection. You may call the jurisdiction for technical assistance. Please do not hesitate to call,
especially if you are unsure whether a situation you have discovered may be a problem.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 3-! DecemGer, 2004
Preliminary Drainage Report
Attachment `A': Maintenance Program
Inspection Period:
Number of Sheets Attached:
Date Inspected:
Inspector's Signature:
Cover Sheet
D & D Associates, LLC 257-4520-002
Cullens Road Plnt 3-2 December, 2004
Preliminary Drninnge Report
Maintenance Checklist for Conveyance Systems (Pines and Cwatesl
Frequency Drainage ~ Problem Conditions to Check For Conditions That
System Should Exist
Feature
M.S. Pipes ~ Sediment & Accumulated sediment that Pipe cleaned of all
debris exceeds 20% of the sediment and debris.
diameter of the i e.
M ~ Vegetation Vegetation that reduces free All vegetation removed
movement of water through so water flows freely.
i es.
A Damaged Protective coating is Pipe repaired or
(rusted, bent damaged, rust is causing replaced.
or crushed) more than 50%
deterioration to any part of
pipe.
M ~ Any dent that significantly Pipe repaired or
impedes flow (i.e., replaced.
decreases the cross section
area of pipe by more then
20%).
M Pipe has major cracks or Pipe repaired or
tears allowing groundwater replaced.
leakage.
M.S. Swales Trash & Dumping of yard wastes Remove trash and debris
debris such as grass clippings and and dispose as
branches into swale. prescribed by County
Unsightly accumulation of Waste Management
non-degradable materials Section.
such as glass, plastic, metal,
foam and coated paper.
M Sediment Accumulated sediment that Swale cleaned of all
buildup exceeds 20% of the design sediment and debris so
depth. that it matches design.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 3-3 December, 2004
Preliminary Drainage Report
M Vegetation. Grass cover is sparse and Aerate soils and reseed
not growing weedy or areas are and mulch bare areas.
or overgrown overgrown with woody Maintain grass height at
vegetation. a minimum of 6" for
best stormwater
treatment. Remove
woody growth,
recontour and reseed as
necessary.
M,S Erosion See ponds checklist See ponds checklist
damage to
slopes
M Conversion by Swale has been filled in or If possible, speak with
homeowner to blocked by shed, woodpile, homeowner and request
incompatible shrubbery, etc. that Swale area be
use restored. Contact City
to report problem if not
rectified voluntarily.
A Swale does Water stands in Swale or A survey maybe needed
not drain flow velocity is very slow. to check grades. Grades
Stagnation occurs. need to be in 1 % range
if possible. If grade is
less than 1%,
underdrains may need to
be installed.
If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance.
Comments:
Key: A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storms
D & D Associates, GLC 257-4520-002
Cullens Road Plnt 3-4 December, 2004
Preliminary Drainage Report
Maintenance Checklist for Catch Basins and Tnlets
Feature Drainage ~l Problem Conditions to Check Conditions That
System For Should Exist
Feature
M.S. General ~ Trash, debris Trash or debris in front of No trash or debris
and sediment in the catch basin opening is located immediately in
or on basin blocking capacity by more front of catch basin
than 10%. opening. Grate is kept
clean and allows water to
enter.
M ~ Sediment or debris (in the No sediment or debris in
basin) that exceeds 1/3 the the catch basin. Catch
depth from the bottom of basin is dug out and
basin to invert of the lowest clean.
pipe into or out of the
basin.
M.S. ~ Trash or debris in any inlet Inlet and outlet pipes
or pipe blocking more than free of trash or debris.
1/3 of its height.
M ~ Structural Corner of frame extends Frame is even with. curb.
damage to more than 3/4" past curb
frame and/or face into the street (if
top slab applicable).
Top slab is free of holes
M ~ Top slab has holes larger and cracks.
than 2 inches or cracks
wider than 1/4" (intent is to
make sure all material is
running into the basin).
M ~ Frame not sitting flush on Frame is sitting flush on
top slab, i.e., separation of top slab.
more than 3/4" of the frame
from the to slab.
A ~ Cracks in basin Cracks wider than 1/2" and Basin replaced or
walls bottom longer than 3', any repaired to design
evidence of soil particles standards. Contact a
entering catch basin professional engineer for
through cracks or evaluation.
maintenance person judges
that structure is unsound.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 3-5 December, 2004
Preliminnry Drainage Report
A ~ Cracks wider than 1/2" and No cracks more than
longer than 1' at the joint of 1/4" wide at the joint of
any inlet/outlet pipe or any inlet/outlet pipe.
evidence of soil particles
entering catch basin
throw h cracks.
A ~ Settlement/mis- Basin has settled more than Basin replaced or
alignment 1" or has rotated more than repaired to design
2" out of alignment. standards. Contact a
professional engineer for
evaluation.
M.S. ~ Fire hazard or Presence of chemicals such No color, odor or sludge.
other pollution as natural gas, oil and Basin is dug out and
gasoline. Obnoxious color, clean.
odor or sludge noted.
M.S. ~ Outlet pipe is Vegetation or roots No vegetation or root
clogged with growing in inlet/outlet pipe growth present.
vegetation joints that is more than 6"
tall and less than 6" apart.
]f you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance.
Comments:
Key: A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storms
D & D Associates, LLC 257-4520-002
Cullens Rond Plnt 3-6 December, 2004
Preliminary Drainage Report
Maintenance Checklist fnr Grnunrls (T,anrl.ccaninvl
Frequency Drainage ~I Problem Conditions to Check Conditions That
System For Should Exist
Feature
M General ,~ Weeds Weeds growing in more Weeds present in less
(nonpoisonous) than 20% of the than 5% of the
landscaped area (trees landscaped area.
and shrubs only).
M ~ Safety hazard Any presence of poison No poisonous vegetation
ivy or other poisonous or insect nests present in
vegetation or insect nests. landscaped area.
M.S. ~ Trash & debris Dumping of yard wastes Remove trash and debris
buildup in such as grass clippings and dispose as prescribed
open space and branches. Unsightly by City Waste
accumulation of non- Management Section.
degradable. materials such
as glass, plastic, metal,
foam and coated paper.
M ~ Missing or Any defect in the fence or Fence is mended or
broken screen that permits easy shrubs replaced to form a
parts/dead entry to a facility. solid barrier to entry.
shrubbery
M.S. ~I Erosion Erosion has resulted in an Replace soil under fence
opening under a fence so that no opening
that allows entry by exceeds 4" in height.
people or pets. Causes of erosion
identified and steps taken
to slow down and/or
spread out the water.
Eroded areas are filled,
contoured, and seeded.
M ~ Unruly Shrubbery is growing out Shrubbery is trimmed and
vegetation of control or is infested weeded to provide
with weeds. appealing aesthetics. Do
not use chemicals to
control weeds.
Limbs or parts of trees or
A Trees and ,~ Damage shrubs that are split or Trim trees/shrubs to
shrubs
broken which affect more restore shape. Replace
pees/shrubs with severe
than 25% of the total damage.
foliage of the tree or
shrub.
D & D Associates, LLC 257-4520-002
Cullens Road Plnt 3-7 DecemGer, 2004
Preliminary Drainage Report
M ~ Trees or shrubs that have Replant tree, inspecting
been blown down or for injury to stem or
knocked over. roots. Replace if severely
damaged.
A ~ Trees or shrubs which are Place stakes and rubber-
not adequately supported coated ties around young
or are leaning over, trees/shrubs for support.
causing exposure of the
roots.
If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance.
Comments:
Key: A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storms
D & D Associntes, LLC 257-4520-002
Cullens Road Plat 3-8 December, 2004
Preliminary Drainage Report
Maintenance Checklist for Ponds
Frequency Drainage ~ Problem Conditions to Check Conditions That
System For Should Exist
Feature
M,S General ~ Trash & debris Clumping of yard wastes Removed trash and
buildup in such as grass clippings debris and dispose as
pond. and branches into basin. prescribed by City
Unsightly accumulation Waste Management
of nondegradable Section
materials such as glass,
plastic, metal, foam and
coated paper..
M,S ~ Trash rack Bar screen over outlet Replace screen.
plugged or more than 25% covered Remove trash and
missing by debris or missing. debris and dispose as
prescribed by City
Waste Management
Section.
M ~ Poisonous Any poisonous Remove poisonous
vegetation vegetation which may vegetation. Do not
constitute a hazard to the spray chemicals on
public. Examples of vegetation without
poisonous vegetation obtaining guidance
include: tansy ragwort, from the Cooperative
poison oak, stinging Extension Service and
nettles, devilsclub. approval from the City.
M,S ~ Fire hazard or Presence of chemicals Find sources of
pollution such as natural gas, oil pollution and eliminate
and gasoline, obnoxious them. Water is free
color, odor or sludge from noticeable color,
noted. odor or contamination.
D & D Associates, LLC 257-4520-002
Cullens Roarl Plat 3-9 DecemGer, 2004
Preliminary Drainage Report
M ~ Vegetation not For grassy ponds, grass For grassy ponds,
growing or is cover is sparse and selectively thatch,
overgrown weedy or is overgrown. aerate, and reseed
For wetland ponds, ponds. Grass cutting
plants are sparse or unnecessary unless
invasive species are dictated by aesthetics.
present. For wetland ponds,
handplan nursery-
. grown wetland plants
in bare areas. Contact
the Cooperative
Extension Service for
direction on invasive
species such as purple
loosestate and reed
canary grass. Pond
bottoms should have
uniform dense
coverage of desired
plant species.
M ~ Rodent holes Any evidence of rodent Rodents destroyed and
holes if facility is acting dam or berm repaired.
as a dam or berm, or any Contact the Thurston
evidence of water piping County Health
through dam or berm via Department for
rodent holes. guidance.
M ~ Insects When insects such as Insects destroyed or
wasps and hornets removed from site.
interfere with Contact Cooperative
maintenance activities, Extension Service for
or when mosquitoes guidance.
become a nuisance.
A Tree growth Tree growth does not Trees do not hinder
allow maintenance maintenance activities.
access or interferes with Selectively cultivate
maintenance activity trees such as alders for
(i.e., slope mowing, silt firewood.
removal, or equipment
movements). If trees are
not interfering with
access, leave trees alone.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 3-10 December, 2004
Preliminary Drninage Report
M Side slopes ~ Erosion on Check around inlets and Find causes of erosion
of pond berms or at outlets for signs of and eliminate them.
entrance/exit. erosion. Check berms Then slopes should be
for signs of sliding or stabilized by using
settling. Action is appropriate erosion
needed where eroded control measure(s);
damage over 2 inches e.g., rock
deep and where there is reinforcement, planting
potential for continued of grass, compaction.
erosion.
M Storage area ~ Sediment Accumulated sediment Sediment cleaned out
buildup in pond that exceeds 10% of the to designed pond shape
designed pond depth. and depth; pond
Buried or partially reseeded if necessary to
buried outlet structure control erosion.
probably indicates
significant sediment
deposits.
A Pond dikes Settlements Any part of dike which Dike should be build
has settled 4 inches back to the design
lower than the design elevation.
elevation.
A Emergency ~ Rock missing Only one layer of rock Replace rocks to design
overflow/ exists above native soil standards.
spillway in area 5 square feet or
larger, or any exposure
of native soil.
One Time Emergency Overflow Side of pond has no area Contact City for
overflow/ missing with large rocks to guidance.
spillway handle emergency
overflows.
If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance.
Comments:
Key: A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storms
D & D Associates, LLC 257-4520-002
Cullens Road Plat 3-11 December, 2004
Preliminary Drainage Report
Maintenance C"herklict fnr Tnfiltrat;nn Cvcfame
Frequency Drainage ~ Problem Conditions To Conditions That
System Req'd Check For Should Exist
Feature
M,S General ~ Trash & See Maintenance See Maintenance Checklist
debris Checklist for Ponds. for Ponds.
buildup in
pond
M ~ Poisonous See Maintenance See Maintenance Checklist
ve etation Checklist for Ponds. for Ponds.
M,S ~ Fire hazard See Maintenance See Maintenance Checklist
or ollution Checklist for Ponds. for Ponds.
M - ~ Vegetation See Maintenance See Maintenance Checklist
not Checklist for Ponds. for Ponds.
growing or
is
over rown
M ~ Rodent See Maintenance See 1Vlaintenance Checklist
holes Checklist for Ponds. for Ponds.
M '~ Insects See Maintenance See Maintenance Checklist
Checklist for Ponds. for Ponds.
A Storage ~ Sediment A soil texture test Sediment is removed
area buildup in indicates facility is and/or facility is cleaned so
system not working at its that infiltration system
designed capabilities works according to design.
or was incorrectly A sediment trapping area is
designed. installed to reduce
sediment transport into
infiltration area.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 3-12 December, 2004
Preliminary Drainage Report
A ~ Storage A soil texture test Additional volume is added
area drains indicates facility is through excavation to
slowly not working at its provide needed storage.
(more than designed capabilities Soil is aerated and
48 hours) or was incorrectly rototilled to improve
or designed. drainage. Contact the City
overflows for information on its
requirements regarding
excavation.
M Sediment Any sediment and Clean out sump to design
trapping debris filling area to depth.
area 10% of depth from
sump bottom to
bottom of outlet pipe
or obstructing flow
into the connector
i e.
One Time Sediment Stormwater enters Add a trapping area by
trapping infiltration area conshucting a sump for
area not directly without settling of solids.
present treatment. Segregate settling area
from rest of facility.
Contact City for guidance.
M Rock filters Sediment By visual inspection Replace gravel in rock
and debris little or na water filter.
flows through filter
during heavy rain
storms.
S Infiltration Infiltration .Standing Water in Excavate bottom of trench
Trenches Failure Inspection Well as necessary but at least 3
After 48 hours after feet. Replace with crushed
storm or Overflow rock. Check pretreatment
during Storms systems for effectiveness.
Check tributary area for
sediment sources.
If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance.
Comments:
Key A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storms
D & D Associntes, LLC 257-9520-002
Cullens Road Plat 3-13 December, 2004
Preliminary Drainage Report
Maintenance Checklist fnr Access Rnarls/F,acements
Frequency Drainage ~1 Problem Conditions to Check Conditions That
System For Should Exist
Feature
One Time General ~ No access If ponds or other drainage Determine whether an
road exists system features needing easement to drainage
maintenance by feature exists. If yes,
motorized equipment are obtain City permits and
present, either an access construct gravel (or
road or access from equal) access road. If
public streets is required. not, report lack of
easement to City
attention.
M ~ Blocked Debris which could Roadway free of debris
roadway damage vehicle tires which could damage
(glass or metal). tires.
A Any obstructions which Roadway overhead
reduce clearance above clear to 14' high.
road surface to less than
14'.
A .Any obstructions Obstruction removed to
restricting the access to allow at least a 15' wide
less than 15' width. access.
A.S. Road surface ~ Settlement, When any surface defect Road surface uniformly
potholes, exceeds 6" in depth and 6 smooth with no
mush spots, sf in area. In general, any evidence of settlement,
ruts. surface defect which potholes, mush spots or
hinders or prevents ruts. Occasionally
maintenance access. application of
additional gravel or
pitrun rock will be
needed.
M ~ Vegetation in Remove woody growth at Shoulder free of
road surface early stage to prevent erosion and matching
vehicular blockage. Cut the surrounding road.
back weeds if they begin
to encroach on road
surface.
If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical assistance.
Comments:
Key: A =Annual (March or April preferred)
M =Monthly (see schedule)
S =After major storms
D & D Associntes, LLC 257-4520-002
Cullens Road Plnt 3-14 December, 2004
Preliminary Drainage Report
3.2 RESPONSIBLE ORGANIZATION
The Homeowners Association shall be responsible for the operation and maintenance of on-site drainage
facilities. The maintenance schedule outlined above shall be included in the articles of the property
owner's association.
3.3 VEGETATION MANAGEMENT PLAN
The open space will remain natural to the greatest extent possible. All disturbed areas within the open
space area will be landscaped. The developer shall be responsible for the protection of the open space
until the Homeowners Association is established and can provide proper protection.
3.4 SOURCE CONTROL
Warning signs (e.g., "Dump No Waste -Drains to Ground Water") will be painted or embossed on or
adjacent to all storm drain and Swale inlets and will be repainted periodically as necessary.
D & D Associates, LLC 257-4520-002
Cullens Road Plat 3-15 December, 2004
Preliminary Drainage Report
APPENDIX I
Preliminary Drainage Calculations
257-4520-002
Cullens Road Plat December, 2004
Preliminary Drainage Report
STORMWATER TREATMENT
CONVENTIONAL WET POND:
Description: Culiens Road Plat
Date: 11!12/2004
Job #: 257-4520-002
Reference: -1992 DOE Stormwater Management for Puget Sound Basin (Volume 3)
-Per section Itl-4.4.1 of the DOE:
1) Identify Required Wetpond Volume:
Total Tributary Impervious Area = 2.02 ac.
Total Tributary Disturbed Pervious Area = 3.36 ac.
Required Volume To Treat 6 Month, 24 Hour Storm Event = 11,572 c.f. From StormSHED
2) Determine Wetpond Dimensions (Table III-4.2):
Note: -Wetpond shall be divided into at least two cells, preferably three, approximately equal in size.
-First cell should be 3' deep.
-Cells should be approximately equal in size.
-Minimum depth is 3 feet, maximum depth is 6 feet.
-All ponds greater than 18" or steeper than 4:1 shall be fenced.
-Minimum length to width ratio shall be 3:1, preferably 5:1.
Permanent Pool Volume Provided:
CELL #1 CELL #2 CELL #3
Proposed Wetpond Length =
Proposed Wetpond Width =
Proposed Wetpond Bottom Area =
Proposed Length/Width Ratio =
Proposed Wetpond Bottom Elevation =
Proposed Wetpond Depth =
Proposed Wetpond Freeboard =
Proposed Wetpond Side Slope =
Proposed Wetpond Cell Volume =
Percentage of Cell Volume =
Total Volume = 12,174. cf > Required Volume =
104ft 94ft Oft
10 ft 10ft Oft
1,032 sf 932 sf 0 sf
10.4 :1 9.4 :1 #DIVl01- :1
330 ft 330 ft 0 ft
aft .aft Oft
1ft 1ft Oft
3 :1 3 :1 0 :1
6,371 cf 5,803 cf 0 cf
52% 48% 0%
11,572 cf, Therefore is Adequate.
STORAGE
INFILTRATION POND:
1)
Description: Cullens Road Plat
Date: 11!12!2004
Job #: 257-4520-002
Reference: 1992 DOE Stormwater Management for Puget Sound Basin (Section III-3.6.3)
SITE SUITABILITY CRITERIA PERTAINING TO STREAMBANK EROSION CONTROL ONLY:
GL-1 Soil Suitability
Min. infiltration rate of 0.5 inches per hour.
Infiltration systems shall not use fill material or be placed over fill material.
GL-2 Depth to Bedrock, Water Table, or Impermeable Layer
Bottom of facility shall be at least 3 feet above limiting layer.
GL-3 Setback requirements
Infiltration facilities should be at least 100 feet from drinking water wells, septic tanks or drainfields,
and springs used for drinking water supplies.
Infiltration facilities should be at least 20 feet downslope and 100 feet upslope from building foundations.
GL-4 Land Slope
Infiltration facilities can be located on slopes up to 15%.
Infiltration facilities should be at least 50 feet away from slopes greater than 15%.
GL-5 Drainage Area
Infiltration basins shall have a maximum drainage area of 50 acres.
GL-6 Control of Siltation
Final construction of infiltration trenches shall not be done until) after site construction is finished
and site is stabilized.
Infiltration facilities should not be used for temporary sediment traps.
2) SIZING INFILTRATION FACILITY:
Representative Site Infiltration Rate (f) = 40.00 inlhr Table III-3. Sandy Gravel >2'
Factor of Safety (FS) = 2,0
Design Infiltration Rate (Fd) = 20.00 in/hr = f / FS
0.000463 fps
Distance From Bottom to Bedrock, Till, or Water Level (L) = 5.0 ft
Bottom Surface Area of Pond (As) = 1,968 sf
Height of Water Above Bottom of Gallery (h) = Varies
Use Darcy's Law (equation 3) to Calculate Infiltration Rate in cubic feet per second. (See Following Table).
Q=[(Fd)x(h+L1)x(As)]/L1
Hydraulic Gradient (I)
h
ft I
(ft/ft) Q
(cfs S
cf)
0.0 t:00 -0.911 0
1.0 1:20 1.093'-' 2,281
2.0 1.40 ..1:276 2,934
3.0 1:60 1.458 3,643
Using StormSHED, model facility and check for complete infiltration of the 100-yr storm in 24 hours
STORAGE
Min. Storage Volume Required for 100 yr, 24 hr Storm = 8,139 cf
Maximum Depth of Water in Gallery = 2.80 ft
Time Required to Infiltrate Gallery After 100-yr Storm = `1.7 hr < 48 hours, Therefore is Adequate.
3) STORMWATER STORAGE VOLUME PROVIDED:
Infiltration Pand
Stage Elevation Stage Storage Volume Total Storage Volume
Pond Bottom 335.0 ft 0 cf 0 cf
336.0 2,281 cf 2,281 cf
337.0 2,934. cf 5,215 cf
Pond Top 338.0 ft 3,643 cf 8,858 cf
Freeboard 339.0 ft 4,411 cf 13,269 cf
Design Pond Storage Capacity = 8,858 cf
Total Pond Storage Capacity = 13,269 cf
Storage Volume = 8,858. c.f. > Required Volume = 8,139 c.f.
Appended on: 17:51:37 Tuesday, September 14, 2004
LPOOLCOMPUTE [LPN] SUMMARY using Puls
Event Match Q (cfs) [Peak Q (cfs) CPeak Stg (ft)
_ Vol (cf) [Vol (acft) Time to Empty'.
(100 year -
[ 4.3012
1.4221 ,--_
`2.8028
8139.49
'0.1869
24.50
11)0 year Hydrogra~l~ Rlat
~ __~._.~__~ _~ ~--
_ _ .
a --~--3 L. 1. -~--,__.
~ - -- ~--~
- ~~~ ®;C~allrn~~ Plat
~ _, ~ ~ Y~
, ~,~dIJ~'r'ryY f~i_If
1
~ 3
E
~
.
_
__~_ -a___,_ _.,_-_~_~__.___~___ _ _ _ -- _ _ _ -- -- _
', '~ 2 ,
', O ""'"?' __r _'C~
_
_
•""'f _. _ry _. of _. .9..' __1_..f'_____r _.~__Y_,
~
1 i
~I p _
.~
o ~,; u~ ~n o Yi ~n ua o ~„ i.,; u~ o u, v, ~n a va u, u~ u, o ~;? ~n u~ o u~ u-;
I, ~ N t`I N O F~ tom- F+: 1n N CV N O h-- Y~ Y~ in {'.I N N N O Y~ h- h- lrj N [V
i +~ r N (~'7 ~' ~ t!} t1} t-- CO Q? O f CJ S~7 xY 47 SD 1~- 90 Q? O] ~ r N { l S
~, ~ r t- ~ r ~ r N ~Y N N N
Time in Hr~urs
Running P:\\CAD\\4520 -Donald Findlay\\257-4520-002-Cullens Rd.
Plat\\02-Prelim Plat\\StormShed\\LPN Report.pgm on Tuesday,
September 14, 2004
Summary Report of all Detention Pond Data
~ Event ~Precip (in)
!~6 month 1.7900
r...~ ::._.::_
~2 year 2.8000 '--~--~
[___~
~5 year 3.7500
10 year 4.3500
_ _ _ _ _
~___
;~25 year 5.1000 ~~
~ 0 year ~6.1500~~
BASLIST2
[Cullens Plat] Using [TYPElA] As [100 year]
LSTEND
~BasinID Peak Q
(cfs) ~ Peak T
(hrs) Peak Vol (ac-
cf) Area~~
(ac) Method/Loss Raintype.
IIPI tlens .
I
4.3012 '
i
8 00 ~_
1.5973 ,
5.38 _~~
SCS/SCS
TYPEIA
BASLIST [TYPElA] AS [100 year] DETAILED
[Cullens Plat]
LSTEND
Record Id: Cullens Plat
:Design Method SCS Rainfall type ~ TYPEIA
~Hyd Intv ~ 15.00 min Peaking Factor [~ 484.00
~_ ' [- [Abstraction Coeff ~ 0.20
Pervious Area 3...36 ac ~ rDCIA 2.02 ac
Pervious CN ' ~ 61.00 [DC CN ~ 98.17
Pervious TC ____,_
5.00 min
~DC TC
S.OO min
HYDLIST SUMMARY
[ 100 year out]
LSTEND
HydID ' Peak Q (cfs) Peak T (hrs) Peak Vol (ac-ft); Cont Area (ac)!
100 year ouf X1.42 _~~.
9.25,., ~~1.5983
0.0000
STORLIST
[STO INF POND]
LSTEND
Record Id: STO INF POND
Descrip: Prototype Record Increment 0.10 ft
__ T
[Start El. l 00.0000 ft
~___._ ~~ ~ Stage Vo
Stage (ft) _
Max EL 103.0000 ft'
lume
Volume (cf)
100.00 _
-- ~~ 0.0000
-_ 101.00
~4
- --- ~ 2281.0000
102.00 [~ 5215.0000
103.00 ~ 8858.0000
DISCHLIST
[DIS INF POND]
LSTEND
Record Id: DIS INF POND
Descrip: Prototype Structure: Increment' 0.10 ft
Start El. 100.0000 ft Max El.104.0000 ft
r Stage (ft) ~ _ Discharge (cfs)
0.00 ~~~ 0.0000
- -_~_ - ~ __.~
100.00 _ .~_m
0.0000
100.10 ~ 0.9110
-- 101.00 ~ 1.0930
~~ 102.00 12760
_.
~~~ 103.00
~~ 1.4580
Licensed to: Parametrix Inc. -Olympia
Wetpond Cell #1
ELEV AREA (sq. ft.) AREA (ac.) VOLUME (cu.ft.)
335 1,032 0.024 0
336 1,727 0.040 1,380
337 2,482 0.057 2,105
337 3,292 0.076 2,887
6,371
Wetpond Cell #2
ELEV AREA (sg. ft.l AREA (ac.) VOLUME (cu.ft.)
335 932 0.021 0
336 1,569 0.036 1,251
337 2,262 0.052 1,916
338 3,012 0.069 2,637
5,803
Infiltration Pond
ELEV AREA Isg. ft.) AREA (ac.) VOLUME (cu.ft
335 1,968 0.045 0
336 2,593 0.060 2,281
337 3,274 0.075 2,934
338 4,012 0.092 3,643
339 4,809 0.110 4,411
13,268
APPENDIX II
SCS Soils Map & Soils Report
2s~-4s2o-oo2
Cullens Road Plat DecemGer, 2004
Preliminary Drainage Report
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_~ ~ CHARLES HERRMANN
k 1220 EAST 4'~' AvE
`;i~. OLYMPIA, WA, 98506
VOICE: (360)-236-1.899
- FAX' (360)-236-7813
The Shea Group
Cathy Carlson
PO Box 3427
Lacey, WA 98509-3427
June 22, 2004
Report File Number: 504-0023
Report Subject: Soils investigation for stormwater facility design.
Location: The study site is located in at 9301 & 9329 SE Cullens Road, in Yelm,
Washington. It is in the NE 1/4 of Section 24, Township 17N, Range lE
(Tax Parcel Numbers: 21724110100 and 21724110101).
INTRODUCTION
An onsite soils investigation was performed on May 19, 2004, by Charles Herrmann (soil
scientist). The intent of the work was to identify and characterize on-site soil conditions and how
they would affect storm water facility design. The purpose of this document is to report the
results of those investigations.
METHODS AND MATERIALS
Office Research
The Thurston County Soil Survey was consulted to determine how local soils are mapped and to
determine if some areas might be better suited than others for onsite stormwater infiltration.
Field Research
On May 19t`' , 3 soil pits were excavated with a backhoe to as much as 13 feet in depth on-site
(See site map, Appendix IV).
Soil profiles were evaluated in each pit with special emphasis on soil texture and structure in each
horizon. Soil pits were also evaluated for any sign of a long-term or seasonal water table.
Information obtained from the soil profile description was also used to predict potential soil
percolation or infiltration rates.
page 1
RESULTS AND DISCUSSION
Site Description
The study site (~6.5 acres) is located at 9301 & 9329 SE Cullens Road, in Yelm, Washington (See
vicinity map, Appendix IV). The site is predominately an open pasture with a few clumps of large
trees. There are two existing residential homes. One home is located in the northwestern portion
of the property and is proposed to remain (Lot #9) and the second home is in the southeastern
portion of the site and is proposed to be removed. It is proposed to develop the site into 33
additional single family home sites. The preliminary site layout map provided by the client
indicates the southeast corner of the site along Cullens Road as the potential location for
stormwater facilities.
According to the topography provided by the Thurston County GeoData (provided in Appendix
IV), overall site relief is about 14 feet. On-site elevation ranges from a low of 336 feet located in
the center of the property running north to south to a high of 350 feet in the northeast corner of the
property line. The elevation in the proposed stormwater facility area in the southeaster portion of
the site ranges from 338 to 342 feet.
The nearest natural body of water, according to Thurston County GeoData is Yelm Creek, located
about 600 feet east of the site with a surface elevation of about 320 feet. The lowest point onsite
is about 16 feet higher in elevation than the creek, however, it is expected to share the same
groundwater hydrology. The site is not mapped as a flood or high groundwater hazard area.
Mapped Soils Description
According to the Thurston County Soil Survey, the following soil series is mapped on the site:
Spanaway gravelly sandy loam, 0-3% and 3-15% slopes (classified as asandy-skeletal, mixed,
mesic Andic Xerumbrept'). The Spanaway gravelly sandy loams are very deep, somewhat
excessively drained soil on terraces formed in glacial outwash and volcanic ash.
For your information, standard characteristics of the mapped soil series are described in Appendix
II. Please note that the SCS soil series maps and descriptions characterize expected characteristics
in only the top 60 inches of soil. Furthermore, the map units can have extensive inclusions of
other soil types, and in some rare cases, can be entirely in error. Please refer to the individual pit
descriptions in Appendix I and to the discussion in the text below for specifics on observed site
soil conditions.
Onsite Soil Descriptions
Three soil pits were excavated onsite. Pits # 1 and #2 were located along Cullens Road in the
southeastern corner of the site with approximate surface elevations of 340 and 342 feet,
respectively. Pit #3 was located 100 feet west of pits #1 and #2 with an approximate surface
' Sandy-skeletal, mixed, mesic Andic Xerumbrept, generally meaning the soil has minimal horizon development (ept), has adark-colored,
low base saturation surface horizon (umbr), has developed under conditions of winter precipitation and summer drought (xer), has chazacteristics
attributed to volcanic deposits (andic), has a mesic temperature regime (mean annual temperature ranges from 8° to 15° C (47° - 59° F), has no
specific mineralogic source (mixed), has 15-50% sand by weight and greater than 35% coarse fragments by volume (sandy-skeletal).
page 2
elevation of 339 feet. The preliminary site layout map provided by the client indicates this area as
a potential stormwater facility location. See the site map located in Appendix IV for approximate
pit locations.
The soils in all three pits were typical of the Spanaway gravelly sandy loam soil series. They all
had about 2 feet of black sandy loam with about 10% coarse fragments at the surface. In pit #l,
from about 2 to 4 feet depth, the soil was dark yellowish brown loamy medium sand with about
50% coarse fragments. Below 2 feet in pits #2 and #3, and below 4 feet in pit #l, to 12 to 13 feet
(maximum pit depths), the soil was olive brown medium sand with about 60-70% coarse
fragments. The coarse fragments in the lower soil strata had black Manganese stains on the
undersides of the rocks. However, Manganese stains on the undersides of the- rocks is not
typically a sign of long duration saturation, but rather is a result of Mn laden groundwater
condensing and then evaporating on rock bottoms.
In Pit #3 from 10 to 13 feet in depth, the coarse fragments had a moist silt loam coating. The silt
loam coatings did not have color indicators of long duration saturation. The presence of the silt
loam coating appears to indicate a groundwater hydrology that is subject to large, short duration
fluctuations in the water table. Please note that the presence of silt loam coatings may also be a
result of an ancient hydrologic conditions and may no longer persist in this area. In any case, this
does not appear to indicate a current, long-duration winter groundwater table. Please note that
detailed pit descriptions are located in Appendix I.
Below about 4 feet depth, the extremely gravelly medium sand soils observed onsite are expected
to infiltrate at rates much greater than 20 inches per hour. When we have tested similar soils,
rates of between 50 and 100 inches per hour were common. Special care will be need to insure
that all of the black sandy loam surface material is removed and not allowed to wash back into the
base of an infiltration facility.
We recommend that the base of the infiltration facilities be sited 4 feet below the existing grade.
This will allow for at least 9 feet of vertical separation to any possible layer that is restrictive or
saturated for a long duration and at least 6 feet of vertical separation to the possible short duration
watertable indicators observed in Pit #3. Due to the coarse textured nature of the material
observed onsite, effects from groundwater mounding are anticipated to be minimal.
We hope this report provides enough information to proceed with project planning. Please call if
you have any questions or require additional detail or clarification on any of these issues.
Thank You,
~~ .
~ ~ ,
~~~a- ~~--fig.,-°•---`'"
Pacific Rim Soil & Water, Inc.
Charles Hemnann
soil scientist
Lisa Palazzi, CPSS
ARCPACS certified soil scientist
page 3
APPENDIX I
SOIL PROFILE- DESCRIPTIONS
APPENDIX I
Pit 1
Horiz Dnth Col CF Txt Stnac Perc Tune Mott Roots OM %C
A 0-24 10YR3/2 10 SL WMG 0.6-Z - - MF 5 <10
B 24-48 10YR4/6 50 LMS WFSAB 6-20 - - FF <3 <10
C1 48-112 2.SY4/3 60 MS SG 20+ - * FF,FM <3 <10
C2 112-150 2.SY4/3 60 MS SG 20+ - * - <3 <10
Typical of the Spanaway series.
C1 and C2 have Mn stains on the b ottoms of the coarse fragments (not an indicator of long durati on saturation)
Well drained gravel and cobbles.
Pit 2
Horiz Dnth Col CF Txt Struc Perc Tvne Mott Roots OM %C
A 0-24 10YR3/2 10 SL WMG 0.6-2 - - MF 5 <10
C 24-142 2.SY4/3 60 MS SG 20+ - * MF,FM <3 <10
Typical of the Spanaway series.
*C has Mn stains on the bottoms of the coarse fragments (not an indicator of long duration saturation)
Well drained gravel and cobbles.
Pit 3
Horiz D th Col CF Txt Struc Perc Type Mott Roots OM %C
A 0-24 10YR3/2 10 SL WMG 0.6-2 - - MF 5 <10
C1 24-126 2.SY4/3 70 MS SG 20+ - * FF <3 <10
C2 126-156 2.SY4/3 70 MS** SG 20+ - * - <3 <10
Typical of the Spanaway series.
*C 1 and C2 has Mn stains on the bottoms of the coarse fragments (not an indicator of long duration saturation)
Well drained gravel and cobbles.
** moist
C2 SiL coating on the rocks. Still. well drained, but may have ground water flash up during periods of heavy rain for a
short duration..
page 4
APPENDIX. II
SOIL SERIES DESCRIPTIONS
APPENDIX II
SPANAWAY SERIES
The Spanaway gravelly sandy foams are very deep, somewhat excessively drained soil on terraces
formed in glacial outwash and volcanic ash. The top 20 inches are expected to be very dark-
colored gravelly to very gravelly foams and sandy foams. Subsoils are expected to be extremely
gravelly sands. In some areas, these soils can also be very stony (rocks larger than 10 inches in
diameter).
Soil percolation rates are expected to be moderately rapid (2-6 inches per hour) near the surface
and very rapid (greater than 20 inches per hour) in the extremely gravelly sand substratum.
These soils are used mainly as hayland, pasture, or cropland, as homesites, or as a gravel source.
The primary limitation for any vegetation-related use is the very low water holding capacity in the
subsoils.
The volcanic ash influence in these soils maybe evidenced by fine-textured soils in interstices
between coarse fragments. Furthermore, these soils may show an increased tendency to cement or
compact firmly in surface horizons when disturbed. The volcanic ash particles tend to break
down into amorphous clays -- a silica gel.
The main limitation for septic system (or stormwater pond) design is the gravelly subsoil's poor
filtering capacity -- a result of rapid percolation rates and relatively low silt and clay content.
Community sewer systems or alternative septic systems (usually sand filter and/or pressure
distribution) are encouraged to avoid contamination of groundwater or nearby wells. Grass-lined
swales or sand lined ponds may be encouraged for pretreatment of stormwater prior to infiltration.
page 5
APPENDIX III
DEFINITIONS
Column Headings:
Horiz =horizon: This word refers to the horizontal bands of soil that form at various depths from the surface as a result of either
accumulation of organic materials or leaching of clays and salts by water. "A" horizons generally have an accumulation of
organic materials. "B" horizons generally have an accumulation of clays or salts. "C" horizons are generally either
undifferentiated parent material or are below the zone of major biological activity. A small letter following the capital letter
provides additional information. "Bw" describes a "cambic" or barely developed B horizon; A "cw", "cs" or "ci" after a B or
C describes a horizon with weak cementation, strong cementation, and induration respectively. An "r" after a B or C indicates
that the horizon is dominated by saprolyte, which is rotten rock -- i.e. rock that is so decomposed that it is almost soil. An 'R"
after a C indicates that the C horizon is predominantly hard, undecomposed bedrock. A "2" in front of a B or C horizon
indicates that the subsoils have a different parent material than the overlying soils.
Dpth =depth: gives the distance from the surface for the top and bottom of each horizon.
Col =color: gives a Munsell Book color chip code. The Munsell color codes (example:lOYR 3/4) give information on the hue
(1 OYR), value (3), and chroma (4) of the soil. Soil color can be used to infer parent material, percent organic content, or soil
drainage characteristics. For example, soils with both low chroma and value (example: l OYR 2/2) are very dark-colored and
tend to have high organic matter contents; soils with a Munsell chroma code of 2 or less (example: l OYR 7/2) may be poorly
drained.
The following valuelchrome color codes correspond to the following soil color names for the two most commonly used HUE
pages l OYR and 2.SY:
lOYR HUE
COLOR NAME VALUE/CHROMA 2.SY HUE
COLOR NAME VALUE/CHROMA
white 8/1, 8/2 white N8/, 8/Z
light gray 7/l, 7/2 light gray N7/, 7/2
gray 6/1, 5/1 gray N6/, NS/
dark gray 4/l dark gray N4/
very dark gray 3/1 very dark gray N3/
black 2/l black N2/
very pale brown 8/3, S/4, 7/3, 7/4 pale yellow 8/4, 7/4
light brownish gray 6/2 light brownish gray 6/2
grayish brown 5/2 grayish brown 5/2
dark grayish brown 4/2 dark grayish brown 4/2
very dark grayish brown 3/2 very dark grayish brown 3/2
very dark brown 2/2 light brownish gray 6/2
yellow 8/6, 8/8, 7/6, 7/8 grayish brown 5/2
pale brown 6/3 dark grayish brown 4/2
brown 5/3 very dark grayish brown 3/2
dark brown 4/3, 3/3 pale yellow 8/4, 7/4
light yellowish brown 5/4 light yellowish brown 6/4
brownish yellow 6/6, 6I8 light olive brown 5/4, 5/6
yellowish brown 5/4, S/6, 5/8 olive brown 4/4
dark yellowish brown 4/4, 4/6, 3/4, 3/6 yellow 8/6, 8/8, 7/6, 7/8
olive ellow 616, 6/8
Txt =texture: describes the relative dominance in size of soil particles smaller than 2 mm diameter. Sand, silt, and clay are the three
size classes with sand being largest and clay being smallest. The textural names are applied based on the weight percentage of
sand (S), silt (Si), and clay (C). The field estimate of percent sand, silt and clay are given with the textural name.
CF =percent coarse fragments. Coarse fragments are defined as any mineral fragment in the soil greater than Zmm diameter. If
needed, coarse fragments are also described in terms of various size classes -- gravel, cobble, stone, etc. Abbreviations associated
with CF percentages will be: Co = cobbly (coarse fragments >3"diameter), Cn =concretions (small, round pebble-1 ike fragments
formed by soil minerals dissolving and then re-precipitating). If no abbreviation is included, assume that the percent CF is
describing gravels (coarse fragments >2mm and <3" in diameter).
-1-
If coarse fragment content is expressed as 15-35 percent, the fine fraction (soil particles less than 2 mm diameter) textural call
is modified and defined as gravelly (i.e. gravelly loam or gravelly silty clay); 35-65 percent is very gravelly; greater than 65
percent is defined as extremely gravelly.
Struc =structure: describes the shape and size of the natural soil clods. Soil with strong structure is generally considered to be stable
and well developed. Soils that are periodically disturbed generally have poor structure. Fine textured soils with weak structure
often have poor percolation capabilities.
OM =percent organic matter. In mineral soils, organic matter decreases with distance from the soil surface. Low percentages (3%
or less) at the surface can indicate erosion problems. Increased percentages below the surface can indicate a buried surface (fill
on the surface). Organic matter improves structure and fertility. Surface OM% in mineral soils ranges from 4 to 20%. When
OM% is greater than 20%, the soil may be classified as an organic rather than mineral soil. This is generally indicative of
saturated and/or cold conditions in the soil.
Root =rooting depth: can be used to locate layers in the soil that may restrict growth or water movement.
Mott =mottles: are an indication that the soil goes through alternating periods of extended saturation and drying.
Perc =percolation rate. The percolation rate is an estimate of inches per hour water percolation through the soil. The range in
percolation rates as devised by the SCS are as follows:
Class Estimated inches/hour
Very slow less than 0.06
Slow 0.06-0.2
Moderately slow 0.2-0.6
Moderate 0.6-2.0
Moderately rapid 2.0-6.0
Rapid 6.0-20
Very rapid more than 20
The field estimate is made based on soil texture, percent coarse fragments, and other soil features, such as indication of
cementing and the presence of mottles.
Type =soil type: as defined in Article IV, Rules and Regulations of the Thurston County Board of Health Governing Disposal of
Sewage (same as State definition). These groupings have been recently reviewed and revised at the State level, but in general
indicate soil texture and relative percent of coarse fragments with the Type 1 soils being the most coarse-textured with the
highest coarse fragment percentage and the Type 6 soils being the finest textued.
Similar to soil percolation rate estimates, the field typing estimate is based on interpretation of effects of soil texture, percent
coarse fragments, and other soil features, such as indication of cementing and the presence of mottles. In general, soil type
1 is too coarse textured to allow for a standard design. Some pre-treatmetn design is used, then the native soils are used for
disposal of the treatred effluent.; Soil types 3 and 4 are generally preferred, although some type 4's may be limited to some
degree by slow percolation; type 5 soils percolate very slowly and are generally less desireable due to how easily they are
hydraulically overloaded, but mound or pressure distribution systems can be used in some cases to compensate for these
limitations; type 6 soils are unsuited due to minimal percolation.
%C =Percent clay content as estimated using hand-texture techniques in the field.
FIELD DATA ABBREVIATIONS
Texture codes Roots Mottles
L =Loam(y) First letter First letter
Si =Silt(y) M =Many M =Many
S =Sand(y) C =Common C =Common
C = Clay(ey)* F =Few F =Few
F =Fine Second letter Second letter
Gr =Gravelly F -=Fine F =Fine
V =Very M =Medium M =Medium
X =Extremely C =Coarse L =Large
Co = Cobbly Third letter
(* C in front of F =Faint
LS or SL stands D =Distinct
Structure
SG =single grained or loose,
no structure
MS =Massive, meaning no
structure, but not single grained
First letter represents the
strength of the structure
W =Weak
M =Moderate
S =strong
Second letter represents the
size of the structural unit
-11-
APPENDIX IV
PROJECT MAPS
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File Reference Number: 504-0023
Thurston County Map Output Page
Page 1 of 1
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Disclaimer Thurston County makes every effort to ensure that this map is a tore and accurate
representation of the work of County guvemuren[. However, the County and all related personnel ~~ G~~Q
make no wanaury, expressed or implied, retarding the accurrcy, completeness or convenience of
any information disclosed on this snap. Nor does the County accept liability for any damage or ~~ Major Roads
injury caused by the use of this map.
To the ltrllest extent permissib{c pursuant. to applicable law. Thurston County disclaims all
warranties, express or implied, including, but not limited lo, implied wm'ranties of merchant. ability, fioads
data fitness for a partiadar purpose, and nou-infringements of proprietary' rights.
Under no circumstances, including, but not limited to, negligence, shall Thurston Cormty he liable Strazuns
for any direct, indirect, utcjetental, special rn cortsequeutial damages that result from the use of, or
the mnbdiry to use, Thursron County materials. Contours '~ .~
9 2003 - "Thurston County GeoUata Center Wetlands l
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Cullens Load Study Site
9301 & 9329 SE Cullens Rd., Yelm, Washington.
Section 24, Township 17N, Range IE (Tax Parcel Numbers: 217241.10100 & 21724].10101)
APPENDIX III
Vicinity Map
257-4520-002
Cullens Road Plat DecemGer, 2004
Preliminnry Drninnge Report
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FEMA Firm Map
257-4520-002
Cullens Raad Plat December, 2004
Preliminary Drninage Report
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PANEL NUMBER: 530310 0001 A
Parametrix DATE 11/30/0410:07am PILE: 0452D002P02F-04
Appendix IV
Cullens Place
N FEMA FIRM MAP
NO SCALE
APPENDIX V
Facility Summary Forms
2s~-4s2o-oo2
Cullens Road Plat December, 2004
Preliminary Drainage Report
CITY OF YELM REGION
FACILITY SUMMARY FORM
Complete one (1) for each facility (detention/retention, coalescing plate
filter, etc.) on the project site. Attach 8 1/2 x 11 sketch showing location
of facility.
Proponent's Facility Name or Identifier (e.g., Pond A) ..............: See Part 6
Name of Road or Street to Access Facility :...................... Cullens Road SE
Hearings Examiner Case Number :........................... .
Development Rev. Project No./Bldg. Permit No .:................ .
Parcel Number :........................................... 21724110100,21724110101
To be completed by Utility Staff:
Utility Facility Number
Project'Number (num)
Parcel Number Status: (num, lch)
O, Known; 1 Public; 2 Unknown;
3, Unassigned
Basin and Subbasin; (num, 6ch)
(2ch for basin, 2ch for subbasin, 2ch future
Responsible jurisdiction: (alpha, lch)
Part 1 - Proiect Name and Protionent
Project Name
Project Owner ...............................
Project Contact ..............................
Address ...................................
Phone .....................................
Project Proponent: (if different) ................. .
Address ....................................
Phone .......... ...........................
Project Engineer .............................
Firm .......................................
Cullens Road Plat
D & D Associates, LLC
Donald Findlay
P.O. Box 310, Gig Harbor, WA 98355
(253) 851-3600
Same
Same
Same
Daniel J. Osier, P.E.
Parametrix
360-459-3609
Part 2 -Project Location
Section(s) 24
Township 17 N
Range 1 E, Willamette Meridian
Part 3 -Type of Permit Application
Type of permit (e.g., Commercial Bldg.):
Other Permits (circle)
^DOF/W HPA
^COE Wetlands
^FEMA
^Shoreline Mgmt
^Encroachment
^NPDES
nOther
^COE 404
^DOE Dam Safety
^Floodplain
^Rockery/Retaining Wall
®Grading
Other Agencies (Federal, State, Local, etc.) that have had or will review this Drainage
Erosion Control Plan:
Part 4 -Proposed Project Description
What stream basin is this project in (e.g., Percival, Woodland):... .
Project Size, acres ..................................... .
Zoning ...............................................
On-site:
Residential Subdivision:
Number of Lots :................................. .
Lot size (average), acres :......................... .
Building Permit /Commercial :......................... .
Building Footprint, acres :......................... .
Concrete Paving, acres ::...................... .
Gravel Surface, acres ::...................... .
Lattice Block Paving, acres :.:...................... .
Public Roads (including gravel shoulder), acres:.......... .
Private Roads (including gravel shoulder), acres :....... .. .
On-site Impervious Surface Total, acres :................ .
Part 5 -Pre-Developed Project Site Characteristics
Stream through site, y/n: ................................... No
Name: .......................................
DNR Type: ........................................
Type of feature this facility discharges to (i.e., lake,
stream, intermittent stream, pothole, roadside ditch,
sheetflow to adjacent private property, etc.):
Infiltration into ground, y/n:
Swales, Ravines, y/n::... .
Steep slopes (steeper than 15%) y/n :................ .
Erosion Hazard, y/n :............................ .
100 yr. Floodplain, y/n :..................... ..... .
Lakes or Wetlands, y/n :............................
Seeps/Springs, y/n ::............................. .
High Groundwater Table, y/n :..................... .
Wellhead Protection or Aquifer Sensitive Area, y/n:...... .
Groundwater
Y
N
Y
Slight
N
N
N
N
Y
Yelm Creek
6.58 ac
Medium Density
Residential (R-6)
30
0.11
1.27
1.80
Part 6 -Facility Description -Basin 1- Wetnond & Infiltration Pond
Total Area Tributary to Facility Including Off-site (acres):........ 5.38
Total On-site Area Tributary to Facility (acres) :................ 4.81
Design Impervious Area Tributary to Facility (acres) :............ 2.02
Design Landscaped Area Tributary to Facility (acres):........... 3.36
Design Total Tributary Area to Facility (acres) :................ 5.38
Enter a one (1) for the type of facility: ) :..................... .
Wet pond detention .................................. 1
Wet pond water surface area, acres ........... ......... 0.15
Dry pond detention ................................ .
Underground detention .............................. 1
Infiltration pond ................. ................... 1
Dry well infiltration ...................................
Coalescing plate separator ............................
Centrifuge separator ............................... .
Biofilter ...........................................
Other ..............................
Outlet type (Enter a one (1) for each type present)
Filter .............................................
Oil water separator ................................. .
Single orifice ...................................... .
Multiple orifice ..................................... .
Weir .............................................
Spillway ..........................................
Pump(s) ..........................................
Other .............................................
Part 7 -Release to Groundwater
Design Percolation Rate to Groundwater (if applicable) ............... 20 in./hour
APPENDIX VI
Residential Maintenance Agreement
257-4520-002
Cullens Roam Plnt December, 2004
Preliminary Drainage Report
RESIDENTIAL
AGREEMENT TO MAINTAIN
STORMWATER FACILITIES BY AND BETWEEN
D & D ASSOCIATES, LLC
THEIR HEIRS, SUCCESSORS, OR ASSIGNS
(HEREINAFTER "OWNER")
AND
City of Yelm
(HEREINAFTER "Jurisdiction")
The upkeep and maintenance of stormwater facilities is essential to the protection of
water resources. All property owners are expected to conduct business in a manner that promotes
environmental protection. This Agreement contains specific provisions with respect to maintenance of
stormwater facilities.
LEGAL DESCRIPTION:
Parcel Numbers 21724110100 and 21724110101 in the City of Yelm.
Whereas, OWNER as constructed improvements, including but not limited to, building,
pavement, and stormwater facilities on the property described above. In order to further the goals of the
Jurisdiction to ensure the protection and enhancement of .Turisdiction's water resources, the Jurisdiction
grid OWNER hereby enter into this Agreement. The responsibilities of each party to this Agreement are
identified below.
OWNER SHALL:
(1) Implement the stormwater facility maintenance program included herein as Attachment "A".
(2) Maintain a record (in the form of a logbook) of steps taken to implement the program referenced in (1)
above. The logbook shall be available for inspection by appointment at 4701 39th Court SE. The logbook
shall catalog the action taken, who took it, when it was done, how it was done, and any problems
encountered or follow-on actions recommended. Maintenance items ("problems") listed in Attachment
"A' shall be inspected on a monthly or more frequent basis as necessary. OWNER is encouraged to
photocopy the individual checklists in Attachment "A" and use them to complete its monthly inspections.
These completed checklists would then, in combination, comprise the monthly log book.
(3) Submit an annual report to the Jurisdiction regarding implementation of the program referenced in (1)
above. The report must be submitted on or before May 15 of each calendar year and shall contain, at a
minimum, the following:
(a) Name, address, and telephone number of the business, the person, or the firm responsible
for plan implementation, and the person completing the report.
(b) Time period covered by the report.
(c) A chronological summary of activities conducted to implement the program referenced in
(1) above. A photocopy of the applicable sections of the log book, with any additional
explanation needed, shall normally suffice. For any activities conducted by paid parties,
include a copy of the invoice for services.
(d) An outline of planned activities for the next year.
THE JURISDICTION SHALL:
(1) Maintain all stormwater system elements in the public rights-of--way, such as catch basins, oil-water
separators, and pipes.
(2) Provide technical assistance to OWNER in support of their operation and maintenance activities
conducted pursuant to its maintenance program. Said assistance shall be provided upon request, and as
Jurisdiction time and resources permit, at no charge to OWNER
(3) Review the annual report and conduct a minimum of one (1) site visit per year to discuss performance and
problems with OWNER
(4) Review this Agreement with OWNER and modify it as necessary at least once every three (3) years.
REMEDIES:
(1) If the Jurisdiction determines that maintenance or repair work is required to be done to the stormwater
facilities located in the subdivision, the Jurisdiction shall give OWNER notice of the specific maintenance
and/or repair required. The Jurisdiction shall set a reasonable time in which such work is to be completed
by the persons who were given notice. If the above required maintenance and/or repair is not completed
within the time set by the Jurisdiction, written notice will be sent to OWNER stating the Jurisdiction's
intention to perform such maintenance and bill OWNER for all incurred expenses.
(2) If at any time the Jurisdiction determines that the existing system creates any imminent threat to public
health or welfare, the Jurisdiction may take immediate measures to remedy said threat. No notice to the
persons listed in (1), above, shall be required under such circumstances. All other OWNER
responsibilities shall remain in effect.
(3) OWNER grants unrestricted authority to the Jurisdiction for access to any and all stormwater system
features for the purpose of performing maintenance or repair as may become necessary under Remedies
(1) and/or (2).
(4) OWNER shall assume all responsibility for the cost of any maintenance and for repairs to the stormwater
facility, except for those maintenance actions explicitly assumed by the Jurisdiction in the preceding
section. Such responsibility shall include reimbursement to the Jurisdiction within 90 days of the receipt
of the invoice for any such work performed. Overdue payments will require payment of interest at the
current legal rate for liquidated judgments. If legal action ensues, any costs or fees incurred by the
Jurisdiction will be borne by the parties responsible for said reimbursements.
This Agreement is intended to protect the value and desirability of the real property described above and
to benefit all the citizens of the Jurisdiction. It shall run with the land and be binding on all parties having
or acquiring any right, title, or interest in the property or any part thereof, of real property in the
subdivision. They shall inure to the benefit of each present or future successor in interest of said property
or any part thereof, or interest therein, and to the benefit of all citizens of the Jurisdiction.
Owner
STATE OF WASHINGTON )
ss
COUNTY OF THURSTON )
Owner
On this day and year above personally appeared before me,
and known to be the individual(s) described,
and who executed the foregoing instrument and acknowledge that they signed the same as their free and
voluntary act and deed for the uses and purposes therein mentioned.
Notary Public in and for the State
of Washington, residing in
My commission expires
Dated at Olympia, Washington, this day of day of , 200,
Director of Public Works
STATE OF WASHINGTON )
ss
COUNTY OF THURSTON )
On this day and year above personally appeared before me,
who executed the foregoing instrument and acknowledge the said
instrument to be the free and voluntary act and deed of said Municipal Corporation for the uses and
purposes therein mentioned and on oath states he is authorized to execute the said instrument.
Given under my hand and official seal this day of ,200
APPROVED AS TO FORM:
Notary Public in and for the State
of Washington, residing in
My commission expires
City Attorney
APPENDIX VII
Preliminary Grading, Storm Drainage and Erosion
Control Plan
257-4510-001
Cullens Rond Plat December, 2004
Preliminary Drainage Report
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Cullens Road Plat
Tree and Vegetation Plan
Trees on the site are primarily located along the ridge line and in the area of future subdivision
roads. In order to meet maximum slope requirements for the roads and to allow stormwater to
reach the storm ponds, it will be necessary to grade the area. No trees on the site are proposed for
retention.
The applicant proposes to plant street trees as required by the Yelm Development Standards for
the internal local access streets and the neighborhood collector along Cullens Road. Tracts A, B
and C will be landscaped in accordance with YMC, Chapter ,17.80, Landscaping Requirements.