99-8237 Project Review & Correspondence
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To: Tami
From' Steph
CC' File
Date: 12/18/01
Re Recorded Waiver of Protest and Special Power of Attorney
Enclosed are copies of the recorded Waiver of Protest and Special Power of Attorney
regarding City of Yelm and Harry B Lewis for your records.
Steph
(C(Q)l}?>Y
Return Address
City Of YelmfPublic Works
P.O Box 479
Yelm, W A 98597
Document Title( s)
Waiver of Protest and Special Power of
Attorney (LIDfULIDfLA TECOMER)
Reference Numbers(s) of related documents
None
Grantor( S) (Last, First and Middle Initial)
City of Yelm
Harry B Lewis
Grantee(s) (Last, First and Middle Initial)
City of Yelm
Legal Description (abbreviated form: i.e. lot, block, plat or section, township, range, quarter/quarter)
That Part of the Northeast quarter of the Northwest quarter of Section 19, Township 17
North, Range 2 East, W.M., being Lot 4 of City of Yelm Short Plat No. SS-8036 as
recorded under the Auditor's File No. 9111260271 in Vol. 25 of Short Plats, page 408.
Assessor's Property Tax Parcel/Account Number
22719210404
The AuditorfRecorder will rely on the information provided on this form. The staff will not read the document to verify the
accuracy or completeness of the indexing information provided herein.
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AGREEMENT
WAIVER OF PROTEST
AND SPECIAL POWER OF ATTORNEY
(lID/UlID/lA TECOMER)
THIS INSTRUMENT is entered into this ~1t\- day of February, 2000, by and
between the CITY OF YELM, a municipal corporation, (acting in its regulatory capacity)
hereinafter referred to as the "CITY", and HARRY B LEWIS and CITY OF YELM
(acting in its proprietary capacity) hereinafter collectively sometimes referred to as the
"OWNER", WITNESSETH
WHEREAS, the Owner holds record title to the following described property
located within Thurston County, Washington
That part of the Northeast quarter of the Northwest quarter of
Section 19, Township 17 North, Range 2 East, W M , being Lot 4 of
City of Yelm Short Plat No SS-8036 as recorded under the
Auditor's File No 9111260271 in Vol 25 of Short Plats, page 408
Records of Thurston County, Washington
and WHEREAS, the City has required as a condition of approval of the Owner's
site plan/subdivi~ion for said property that the Owner participate in the construction of
certain utilities and/or street improvements as they directly relate to said property and
the Owner desires that said requirement be delayed until projects are formulated for the
joint participation of other affected owners
and WHEREAS, the term Owner as used hereafter shall mean the City of Yelm
acting In its proprietary capacity, so long as City of Yelm remains in title to the said
described real property subject to the existing Deed of Trust covering said real property
and securing the debt to Harry B Lewis and shall mean Harry B Lewis at such time (if
at all) as Harry B Lewis shall acquire title to the said real property free and clear of the
said Deed of Trust.
NOW, THEREFORE, IT IS HEREBY AGREED BETWEEN THE PARTIES as
follows
1 The City will delay its requirement for the immediate partIcipation by the
Owner in the construction of certain utilities and/or street improvements, subject to the
conditions set forth hereinafter
2 The Owner will financially participate in the following utility and/or street
projects on an equitable basis with other affected property owners
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12,'18/2~Sl S9 19A
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Sanitary sewer system improvements,
Water system improvements,
X Storm water system improvements,
X Street improvements,
X Street lighting improvements,
X Sidewalk improvements,
X Other Planter Strip landscaping and irrigation,
which improvements are more specifically described as follows
The owner agrees to participate in site frontage improvements to Rhoton Road
Improvements shall be built to the standard of a Commercial Collector Improvements
shall be built from centerline along the property frontage and include a traffic lane,
shoulder, curb and gutter, planter strip and sidewalk The applicant shall provide
stormwater treatment, landscaping and street lighting as required by the City of Yelm
The property owner shall also provide a 10' utility easement behind the public right-of-
way
3 The Owner hereby waives all rights to protest against future Local
Improvement District (LID), Utility Local Improvement District (ULlD), or Latecomer
Ordinance and Agreement proceedings for the construction of said improvements
described in Section 2 herein For purposes of this Instrument, "rights of protest" shall
mean only those formal rights to protest contained within the LID, ULlD or Latecomer
Ordinance and Agreement statutes, except, however, nothing herein shall constitute a
waiver by the Owner or the Owner's heirs, assigns or successors in interest, of the right
to object to the Owner's individual assessment amount or latecomer charge or to appeal
to the Superior Court the decision of the Council affirming the final assessment roll or
latecomer ordinance and agreement, which rights are specifically preserved
4 The Owner hereby grants and conveys to the City Engineer of the City of
Yelm, or his successor in interest or designee, a Special Power of Attorney to exercise
any and all rights of the Owner, including any purchasers, mortgage holders, lien
holders or other person who may claim an interest in the property descnbed herein,
above, to accomplish the following At such time as a Local Improvement District, Utility
Local Improvement District, or Latecomer Ordinance and Agreement is proposed that
would cause said improvements to be made available to the Owner's property described
herein above, to execute a Petition on behalf of the Owner for the creation of such LID,
ULlD or Latecomer Ordinance and Agreement. This Special Power of Attorney is
granted in consideration of the City executing this Instrument, and shall be a power
coupled with an interest which may not be terminated This Special Power of Attorney
shall not be affected by the disability of the Owner
5 If the Owner fails to perform in good faith in accordance with this
Instrument, it is agreed that the City may discontinue utility service to the property
described herein, after giving 20 days notice thereof and an opportunity for hearing
thereon, or may pursue other eqUitable or legal remedies
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6 The Owner hereby declares that the City of Yelm and Harry Lewis are the
sole owner(s) of the property described herein and has/have full power to commit said
property to this Agreement, Waiver of Protest and Special Power of Attorney
7 This Instrument constitutes a covenant running with the land and shall be
binding on all heirs, assigns, transferees and successors in interest.
8 For purposes of RCW 3543 182, and any LID or UUD thereunder, the
effective term of this Instrument shall be a period of ten years from the date hereof For
purposes of RCW 35 72 and RCW 3591, and any Latecomer Ordinance and
Agreement thereunder, the effective term of this Instrument shall be a period of fifteen
years from the date such an Ordinance and Agreement becomes effective
IN WITNESS WHEREOF the parties hereto have caused this Instrument to be
executed the day and year first above written
By
CITY OF YELM
STATE OF HAWAII )
1\ J (). I. ; ) ss
County of \~\U-U-^- )
On this ~ day of P.bVI.I~ ' 2000, personally appeared
before me Harry B Lewis, to me know to be the IndiVidual deSCribed In and who
executed the within and foregoing instrument and acknowledged that he signed the
same as his free and voluntary act and deed, for the uses and purposes herein
mentioned
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NOTARY UBLlC in an or t~e f?tate of
Hawaii residing at \4"'-ti \-{QW Hcu.u(1lJ
}
My commission expires 1Qllj 1 d<OO\
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STATE OF WASHINGTON)
) ss
County of Thurston )
On this ~ day of February, 2000, personally appeared before me Kathryn M
Wolfe, to me known to be the Mayor of the City of Yelm who executed the within and
foregoing instrument and acknowledged that she signed the same as the free and
voluntary act and deed of the City of Yelm, with the full authority, for the uses and
purposes herein mentioned
______....-.-~~"V'<....
STEPHANIE A. CONNERS
COMMISSION EXPIRES
06-15-2003
NOTARY PUBLIC
STATE OF WASHINGTON
NOTA PUBLIC 'n an~ the State of
Washington residing at ~/O)
My commission expires &, / S- 20n.3
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AGREEMENT
WAIVER OF PROTEST
AND SPECIAL POWER OF ATTORNEY
(L1D/ULlD/LA TECOMER)
THIS INSTRUMENT is entered into this ~ day of February, 2000, by and
between the CITY OF YELM, a municipal corporation, (acting in its regulatory capacity)
hereinafter referred to as the "CITY", and HARRY B LEWIS and CITY OF YELM
(acting in its proprietary capacity) hereinafter collectively sometimes referred to as the
"OWNER", WITNESSETH
WHEREAS, the Owner holds record title to the following described property
located within Thurston County, Washington
That part of the Northeast quarter of the Northwest quarter of
Section 19, Township 17 North, Range 2 East, W M , being Lot 4 of
City of Yelm Short Plat No SS-8036 as recorded under the
Auditor's File No 9111260271 in Vol 25 of Short Plats, page 408
Records of Thurston County, Washington
and WHEREAS, the City has required as a condition of approval of the Owner's
site plan/subdivi~ion for said property that the Owner participate in the construction of
certain utilities and/or street improvements as they directly relate to said property and
the Owner desires that said requirement be delayed until projects are formulated for the
joint participation of other affected owners
and WHEREAS, the term Owner as used hereafter shall mean the City of Yelm
acting in its proprietary capacity, so long as City of Yelm remains in title to the said
described real property subject to the existing Deed of Trust covering said real property
and securing the debt to Harry B Lewis and shall mean Harry B Lewis at such time (if
at all) as Harry B Lewis shall acquire title to the said real property free and clear of the
said Deed of Trust.
NOW, THEREFORE, IT IS HEREBY AGREED BETWEEN THE PARTIES as
follows
1 The City will delay its requirement for the immediate participation by the
Owner in the construction of certain utilities and/or street improvements, subject to the
conditions set forth hereinafter
2 The Owner will financially participate in the following utility and/or street
projects on an equitable basis with other affected property owners
- 1 -
Sanitary sewer system improvements,
Water system improvements,
X Storm water system improvements,
X Street improvements,
X Street lighting improvements,
X Sidewalk improvements,
X Other Planter Strip landscaping and irrigation,
which improvements are more specifically described as follows
The owner agrees to participate in site frontage improvements to Rhoton Road
Improvements shall be built to the standard of a Commercial Collector Improvements
shall be built from centerline along the property frontage and include a traffic lane,
shoulder, curb and gutter, planter strip and sidewalk. The applicant shall provide
stormwater treatment, landscaping and street lighting as required by the City of Yelm
The property owner shall also provide a 10' utility easement behind the public right-of-
way
3 The Owner hereby waives all rights to protest against future Local
Improvement District (LID), Utility Local Improvement District (ULlD), or Latecomer
Ordinance and Agreement proceedings for the construction of said improvements
described in Section 2 herein For purposes of this Instrument, "rights of protest" shall
mean only those formal rights to protest contained within the LID, ULlD or Latecomer
Ordinance and Agreement statutes, except, however, nothing herein shall constitute a
waiver by the Owner or the Owner's heirs, assigns or successors in interest, of the right
to object to the Owner's individual assessment amount or latecomer charge or to appeal
to the Superior Court the decision of the Council affirming the final assessment roll or
latecomer ordinance and agreement, which rights are specifically preserved
4 The Owner hereby grants and conveys to the City Engineer of the City of
Yelm, or his successor in interest or designee, a Special Power of Attorney to exercise
any and all rights of the Owner, including any purchasers, mortgage holders, lien
holders or other person who may claim an interest in the property described herein
above, to accomplish the following At such time as a Local Improvement District, Utility
Local Improvement District, or Latecomer Ordinance and Agreement is proposed that
would cause said improvements to be made available to the Owner's property described
herein above, to execute a Petition on behalf of the Owner for the creation of such LID,
ULlD or Latecomer Ordinance and Agreement. This Special Power of Attorney is
granted in consideration of the City executing this Instrument, and shall be a power
coupled with an interest which may not be terminated This Special Power of Attorney
shall not be affected by the disability of the Owner
5 If the Owner fails to perform in good faith in accordance with this
Instrument, it is agreed that the City may discontinue utility service to the property
described herein, after giving 20 days notice thereof and an opportunity for hearing
thereon, or may pursue other equitable or legal remedies
- 2 -
6 The Owner hereby declares that the City of Yelm and Harry Lewis are the
sole owner(s) of the property described herein and has/have full power to commit said
property to this Agreement, Waiver of Protest and Special Power of Attorney
7 This Instrument constitutes a covenant running with the land and shall be
binding on all heirs, assigns, transferees and successors in interest.
8 For purposes of RCW 3543 182, and any LID or ULlD thereunder, the
effective term of this Instrument shall be a period of ten years from the date hereof For
purposes of RCW 35 72 and RCW 35 91, and any Latecomer Ordinance and
Agreement thereunder, the effective term of this Instrument shall be a period of fifteen
years from the date such an Ordinance and Agreement becomes effective
IN WITNESS WHEREOF the parties hereto have caused this Instrument to be
executed the day and year first above written
By'
I.~
CITY OF YELM
STATE OF HAWAII )
\\. J f\ I. ~ ) ss
County of ,\.~ )
On this l day of K1vu~ . 2000, personally appeared
before me Harry B Lewis, to me know to be the IndiVidual described In and who
executed the within and foregoing instrument and acknowledged that he signed the
same as his free and voluntary act and deed, for the uses and purposes herein
mentioned
LiJ
NOTARY UBLlC in an r t~e ~tate of
Hawaii residing at \4~.u) \-\aw tiOJ.U(lU
My commission expires ~
- 3 -
. .
STATE OF WASHINGTON)
) ss
County of Thurston )
On this .2!l day of February, 2000, personally appeared before me Kathryn M
Wolfe, to me known to be the Mayor of the City of Yelm who executed the within and
foregoing instrument and acknowledged that she signed the same as the free and
voluntary act and deed of the City of Yelm, with the full authority, for the uses and
purposes herein mentioned
STEPHANIE A. CONNERS
COMMISSION EXPIRES
06-15-2003
NOTARY PUBLIC
STATE OF WASHINGTON
NOT PUBLIC 'n anCJfh the State of
Washington residing at ~/ (J4
My commission expires (p /!j'.20a3
- 4 -
ME~<9RANVU~
To:
From:
Date:
Subject:
SIte Plan RevIew CommIttee (SPRC)
CathIe Carlson
June 29, 1999
Pubhc Works Yard
Attached IS the project reVIew mformatIOn for the Pubhc Works FacIhty and Pubhc Safety
Complex, I have scheduled the SPRC to review the envIronmental checklIst on Wednesday, July
14 and the SIte Plan on July 21
The project IS on a tIght tIme hne and permIts can not be Issued untIl the SPRC completes ItS
reVIew of the project. Please have written comments completed for each of the above referenced
meetmg dates.
If you have any questIOns or need addItIonal mformatIOn please let me know
Thanks!
YELM PLANNING DEPARTMENT
(x) PWDir
(x) City Admin.
(x) City Planner
{x)PWSupervi$()r
{x)BuildingQff.
(>() Mayor
(x) Applicant (x) Posted
THE FOLLOWING CASES WILL BE CONSIDERED AT YELM CITY HALL, 105
YELM AVE WEST, IN COUNCIL CHAMBERS
MEETING DATE Wednesday, July 21.1999
10:30 p.m
Conversion of Jolly Roger's Building to a Church
Approx. congregation of 30 people - meets 2x a
week. PLEASE NOTE MEETING TIME
11'00 p.m.
1 00 p m
1 30 P m
200 m
2.30 m
Public Works Yard
Pre-submission meetings: Applicants and/or representatives are required to attend meeting
Environmental Review/Site Plan Review. Staff review only, applicants and/or representatives are
not required to attend If you plan to attend, please notify the Planning Department at 458-8408
C .IMyFiles IPlandeptcclWEE KSPR
}vfElvlcYRANVUlvl
ARLSON
CA 1"\-\\E ~ PLANNER
'(ELM C\
To:
From:
Date:
Subject:
SIte Plan RevIew CommIttee (SPRC)
CathIe Carlson
June 29, 1999
PublIc Works Yard
Attached IS the project reVIew mformatIOn for the PublIc Works FacIlIty and PublIc Safety
Complex. I have scheduled the SPRC to reVIew the envIronmental checkltst on Wednesday, July
14 and the SIte Plan on July 21
The project IS on a tight time lme and permIts can not be Issued until the SPRC completes ItS
reVIew of the project. Please have wntten comments completed for each of the above referenced
meetmg dates.
If you have any questIOns or need addItional mformatIOn please let me know
Thanks!
,< '"
City of Yelm
105 Yelm Avenue West
POBox 479
Yelm, Washington 98597
(360) 458-3244
r---------.--n
,
t..._~________
.___J
PLANNING DEPARTMENT
DATE .June 29 1999
APPLICANT City of Yelm Public Works Department CASE NUMBER. SPR-99-8237-YL
PROJECT LOCATION West side of Rhoton Road, north of Rhoton Road and NP Road
PROJECT SUMMARY Public Works Yard and Public Safety Building constructed in three pnases
The enclosed project information is for your review Please provide written comments or recommendatIons to Cathie Carlson
by Fri~.t~L~J.Y 16. 1999 Your comments will become part of the record and utilized in the decision-making process by staff,
Planrllngcommlsslon or City Council
TYPE OF APPLICATION.
r~'-
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1--
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PROPOSED X Site Plan Review Planned Residential Developme;--1
FINAL Preliminary Plat Mixed Use Planned Development
- Master Planned Development 1
ADMINiSTRATIVE Final Plat
--. --1
i='LAhlNING COMMISSION Short Plat Home Occupation(s)
- -'
j- eln COUNCIL Conditional Use Short Subdivision or Boundary Line Adj
~ Variance Mobile Home f'=>ark -3
TO'
Fir
'.y Administrator X Thucston County As'e~
ector of Public Works WSDOT
-
iiding Department Intercity Transit
y Planner School District
.------
y Clerk X Yelm Telephone
--
lice Department X LeMay Garbage Service
,-
e Department X Puget Sound Energy
wston County CapCom X Viacom Cable
.
jacent .Jurlsdiction )( Adjacent Property Owners
.~,---- .-
1m Municipal Court X US Post Office - Yelm
----'_.__._-_.----~
~rstol1 County Environmental Health Department of Ecology
-" -
_ mpic Air Pollution Control Authority X Yelm Cr,amber of Commerce
-------- --
liT; Parks Advisory Committee X Engineer
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CITY OF YElM
PO Box 479
Yelm WA 98597
360-458-3244
) LM
\Nt'\, H NQTOK;
NOTICE OF APPLICATION
Mailed on June 29, 1999
PROJECT NAME AND LOCATION City of Yelm Public Works Yard and Public Safety Building located
on the west side of Rhoton Road, north of the Rhoton Road and NP Road intersection
LAND USE CASE. SPR-99-8237-YL
An application submitted by Ken Garmann, Public Works Director, for the above referenced project was
received by the City of Yelm on June 28, 1999 The City has determined the application to be complete
on June 29, 1999 The application and any related documents are available for public review during
normal business hours at the City of Yelm, 105 Yelm Avenue W , Yelm WA. For additional information,
please contact Cathie Carlson at 458-8408
PROJECT DESCRIPTION The project proposal consist of a City Public Works Facility on 4 9 acres with
a 10,000 square foot building of which 2,000 square feet is for administrative offices and 8,000 square
feet for vehicle maintenance, repair and storage The Public Works Facility will be constructed in two
Phases Phase I consists of the infrastructure and stormwater facilities Phase II is the construction of
the building Phase III is a Public Safety Complex on approximately 1,2 acres and would house the
Yelm Police Department and Municipal Court.
ENVIRONMENTAL and OTHER DOCUMENTS SUBMITTED WITH THE APPLICATION The applicant
has submitted an environmental checklist and Preliminary Drainage Report.
Additional Information or Project Studies Requested by the City' The City has not requested
additional information at this time
No preliminary determination of consistency with City development regulations has been made.
At minimum, this project will be subject to the following plans and regulations City of Yelm
Comprehensive Plan, Zoning Title (17), Critical Areas Ordinance (14 08), Storm water Drainage Design
and Erosion Control Manual (DOE), Uniform Building Code, State Environmental Policy Act (SEPA) Title
(14), Road Design Standards, Platting and Subdivision Title (16), and the Shoreline Master Program
The City of Yelm invites your comments early in the review of this proposal Comments should be
directed to Cathie Carlson at Yelm City Hall, PO Box 479, Yelm WA 98597
THE 15-DAY PUBLIC COMMENT PERIOD ENDS AT 500 PM ON JULY 16,1999
This notice has been provided to appropriate local and state agencies, sub-area project list subscribers,
and property owners within 300 feet of the project site These recipients, and any others who submit a
written request to be placed on the mailing list, will also receive the following items when available or if
applicable Environmental Threshold Determination, Notice of Public Hearing and Notice of Final
Decision If the proposed project requires a City Council decision, it will be mailed to all those who
participate in the public hearing and to anyone else requesting the decision in writing Additionally, there
will be a 15-day public comment period when the environmental determination is issued Opportunities
for appeal occur within twenty one (21) days after the date the environmental determination is issued
City Council decision can be appealed through Superior Court,
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PO BOX 479
llliI WA 98597
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PRELIMINARY
SITE PLAN
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YELM PUBLIC WORKS YARD AND
PUBLIC SAFETY BUILDING
Rhoton Road, Yelm
N W Quarter of Section 19, Township 17N, Range 2E, W.M.
City ofYel'm,. WA
Preliminary Drainage Report
June 1999
JKA
John Knowles & Associates. Inc.
Civil Engineering
Project Management
Construction Management
Ph. (253) 539-1400
Fax: (253) 539-1500
E-mail: jkacivil@nwrain.com
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YELM PUBLIC WORKS YARD
AND PUBLIC SAFETY BUILDING
Preliminary Drainage Report
Prepared foro
City of Yelm
PO Box479
Yelm, WA 98597
(360) 458-8499
Date
June 1999
Prepared by'
John Knowles & Associates, Inc.
POBox 1328
Puyallup, WA 98371-0197
(253) 539-1400
(253) 539-1500 - Fax
jkacivil@nwrain com
Date of Submittal
June 1999
JKA Project No
JKA File No
98006
C \winword\JEKfiles\7041 DR
Project Engineer's Certification
I hereby state that this Drainage and Erosion/Sediment Control Plan for Yelm Public Works
Yard and Public Safety Building has been prepared by me and under m supervision and meets
minimum standards of the City of Yelm
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Table of Contents
Part I Project Description
SECTION 1 - PROPOSED PROJECT DESCRIPTION
SECTION 2 - EXISTING CONDITIONS
SECTION 3 - INFILTRATION RATES/SOILS REPORT
SECTION 4 - WELLS
SECTION 5 - FUEL TANKS
SECTION 6 - SUB-BASIN DESCRIPTION
SECTION 7 - ANALYSIS OF 100- YEAR FLOOD
SECTION 8 - AESTHETIC CONSIDERATIONS FOR STORMWATER FACILITIES
SECTION 9 - DOWNSTREAM ANALYSIS AND FACILITY SIZING
SECTION 10 - COVENANTS, DEDICATIONS, EASEMENTS
Part /I Erosion Control Report
SECTION 1 - CONSTRUCTION SEQUENCE AND PROCEDURE
SECTION 2 - TRAPPING SEDIMENT
SECTION 3 - PERMANENT EROSION CONTROL & SITE RESTORATION
SECTION 4 - GEOTECHNICAL ANALYSIS AND REPORT
SECTION 5 -INSPECTION SEQUENCE
SECTION 6 - CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS
Part 11/ Maintenance Plan
SECTION 1 - REQUIRED MAINTENANCE
SECTION 2 - RESPONSIBLE ORGANIZATION
SECTION 3 - VEGETATION MANAGEMENT
SECTION 4 - SOURCE CONTROL
Appendices
I Preliminary Drainage Plan
II Soils Information
III Preliminary Drainage Calculations
IV WaterWorks Data Output - Basins A, B, and D
V WaterWorks Data Output - Basin C (Rhoton Road)
(c:\winword/JEK files\8006,PDR)
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The format of this report follows the outline provided in the Washington State
Department of Ecology Stormwater Management Manual for the Puget Sound
Basin (DOE SWMM)
PART I PROJECT DESCRIPTION
SECTION 1 - PROPOSED PROJECT DESCRIPTION
The approximate 7 6-acre site is located in the City of Yelm, just northeast of the
Yelm Avenue and Hwy 507 intersection The site is located in the northwest
quarter of Section 19, Township 17N, Range 2E, W M Access to the site is via
Hwy 507 and N W Rhoton Road
The site is currently used for pasture grazing for horses and has a small clump
of Douglas Fir trees, ranging from 14" to 20" in diameter A vicinity map is
included on the Preliminary Drainage Plan in Appendix I of this report.
The project proponent is the City of Yelm
Current zoning is Industrial. Setback requirements for industrial zoning include a
front setback of 15 feet, side setback of 15 feet, and a rear setback of 15 feet.
The proposal is to develop the site for the City of Yelm Public Works
maintenance yard and facilities building A public safety building may also be
located at the 7 6-acre site The development would encompass approximately
5 2 acres of the 7 6-acre site
A 2.4-acre portion of the site has not been identified for a particular use, it is
located in the southwest corner of the property However, the storm drainage
ponds have been sized assuming this portion of the property will be developed in
the future
Access to the site is off of Hwy 507, just northeast of Yelm Avenue and Hwy
507 intersection From Hwy 507, access is along N W Rhoton Road The site
access off Rhoton Road is from the west, just beyond NP Road and prior to
Rhoton Court N W Roadway widening, curb, gutter, and sidewalk
improvements are proposed along the frontage of the project site These access
improvements should provide safe ingress and egress for the proposed project.
Water service will be provided by City of Yelm water system
The project site sanitary sewer service will be provided by the City of Yelm STEP
system The City STEP system currently extends past the proposed project site
and is located on the east side of Rhoton Road
John Knowles & Associates, Inc.
June 1999
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PROPOSED STORMWATER SYSTEM -
Development Coverage Summary
Area Tributary to Proposed Retention Facility
Description Acres Acres
(Post Dev) (Existina\
Asphalt roadway 3 13 AC (includes OAC
Rhoton Road)
Roof area o 41 AC OAC
Pervious area 4 42 AC 76AC
Total 7 96 AC 76AC
Stormwater Collection The majority of runoff generated by development of
roadway improvements will be collected in the grass-lined swales and site catch
basins Roof runoff will be tightlined to the swale and storm pipe system Catch
basins and underground piping will be installed within the roadways where
conveyance swales are not practical for collection and conveyance of runoff
The future-development portion of the site represented by Basin "0" will be
infiltrated within the upper horizons of the native soils of Basin "0" until future
development by the City of Yelm
Stormwater Treatment: Stormwater runoff from the new impervious roadways,
roof tops, and sidewalks will be tributary to the proposed onsite wet pond
treatment facility In addition to the wet pond facility, the grass-lined biofiltration
swale should provide additional treatment and collection of sediment for runoff
from the Public Works Yard facility The Public Safety Building portion of the
project will utilize catch basin and storm pipe for conveyance of stormwater
runoff from the impervious surfaces. All catch basins will be equipped with silt
trap TEEs to further oil/water separation and trapping of sediments within the
catch basin sumps for this project area.
Stormwater runoff from Rhoton Road will be collected via concrete curb and
gutter and discharged into one of three proposed catch basin inlets These
gutter catch basin inlets will be equipped with oil trap TEEs to provide oil/water
separation of stormwater runoff Stormwater discharges from these catch basins
to a second catch basin located at the entrance to the water quality infiltration
trenches The second catch basin will also incorporate silt trap TEEs to provide
additional separation of oil/water and sediments from entering the water quality
trench. The water quality trench will incorporate a 6" lining of sand providing
additional treatment of the stormwater runoff
John Knowles & Associates, Inc.
June 1999
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Yelm Public Works Yard and Public Safety Building
Stormwater Storage. Ultimately, road, roof, and yard area runoff will be directed
to the proposed wet pond and retention pond The retention pond is an open-air
pond which will allow stormwater runoff to infiltrate into the underlying soils The
bottom of the retention pond will be set at elevation 320 A berm will be
constructed between the two ponds, allowing the wet pond stormwater to crest
and flow into the retention pond at elevation 323 The retention pond has the
capacity to store 13,836 cubic feet, at an elevation of 323 This exceeds the
required storage volume of 9,100 cf per our WaterWorks hydrology software
modeling and an infiltration rate of 13"/hr Both the wet pond and retention pond
interior side slopes shall be no steeper than 3 1 Conveyance of stormwater
from the wet pond to the retention pond will be via a 10' wide rock-armored
spillway
Stormwater storage for Basin C, which consists of the offsite stormwater runoff
from Rhoton Road, will be collected, stored, and infiltrated using 3' wide x 3'
deep x 50' long water quality infiltration trenches The storage capacity provided
by the three individual water quality infiltration trenches and associated piping is
523 cubic feet. The required storage volume resulting from the WaterWorks
modeling of the basin is 490 cubic feet. Therefore, the infiltration trenches can
provide adequate storage for the 1 OO-year storm event.
Please refer to the Preliminary Drainage Plan in Appendix I of this report for
depiction of onsite drainage improvements
The project will be constructed in phases, including erosion control measures,
further site clearing, grading, storm drainage improvements, utility installations,
and roadway construction.
SECTION 2 - EXISTING CONDITIONS
The site is bordered by industrial-type uses on the south, an abandoned
industrial site to the north and residential areas to the west. The east side of the
site is bordered by Rhoton Road S E.
The project site is defined as that part of the northeast quarter of the northwest
quarter of Section 19, Township 17N, Range 2E, W M being Lot 4 of City of
Yelm Short Plat No SS-8036 as recorded in Auditor's File No 9111260271 in
Volume 25 of Short Plats, Page 408, Records of Thurston County, Washington
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Site topography consists of a gradual slope from southwest to northeast for the
entire property The highest elevation is in the southwest corner of the site, with
an approximate elevation of 334 feet. The property slopes northeast at an
average slope of 2% The lowest portion of the site is located at the location of
the proposed stormwater facilities. The lowest elevation on the site is located on
the northeast corner of the property, with an approximate elevation of 324 feet.
The site consists of a small group of Douglas Fir trees in the northeast portion of
the site and additional scattered 16" to 24" Douglas -Fir trees throughout the
south half of the project site The site is currently used as pasture for horses
and stockpiling of City of Yelm topsoil and sod
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June 1999
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There are no manmade drainage features on the site. The vast majority of
onsite runoff is likely to be infiltrated within the upper horizons of the onsite soils
with excess overflow to the northeast.
No significantly steep slopes exist on the site The steepest slopes appear to be
in the southwest corner, with an approximate slope of 5% There are no
significant ravines, gullies, or environmentally sensitive areas onsite
Vegetation consists generally of coniferous trees and pasture land
The site is located in an aquifer-sensitive area based on review of Thurston
County Comprehensive Plan Map M8 This project will comply with the
stormwater treatment requirements of the DOE SWMM to mitigate its potential
impacts on the aquifer
Offsite runoff from the northwest and south sides of the site is limited to relatively
small areas immediately adjacent to the property Offsite runoff that would affect
development portions from these areas is minimal The storm water runoff from
Rhoton Road will have a small impact to the project and will be controlled using
the water quality infiltration trenches, as discussed above Stormwater runoff
from Rhoton Road will not be directed to the onsite stormwater facility ponds
SECTION 3 - INFilTRATION RATES/SOilS REPORT
The Soil Conservation Service (SCS) Soil Survey of Thurston County maps the
onsite soils as #110 - Spanaway Gravelly Sandy Loam, 0-3% slopes,
Site-specific soil test pits were logged by RB Engineering (at the direction of
JKA) in the location of the proposed retention pond Two soil test pits were dug
to an approximate depth of eight feet for the soils analysis, From the soils
analysis by RB Engineering, it appears an infiltration rate for the Horizons
targeted by the bottom of the retention pond would well exceed 20" per hour
However, we have decided to use a 20" per hour design infiltration rate with a
factor of safety of 1 5 This resulted in a design infiltration rate of 13" per hour
Copies of the soil logs and excerpts from the SCS mapping are enclosed in
Appendix II
SECTION 4 - WEllS
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The project will be served by City of Yelm water system An offsite well exists
near the site's southwest corner; proposed development will not adversely affect
this well
The project will be served by City of Yelm STEP sewage disposal system
SECTION 5 - FUEL TANKS
No fuel tanks are known to exist on the site, nor were observed during our site
visits Review of the DOE LUST list did not reveal the existence of any tanks in
the vicinity of the project site
John Knowles & Associates, Inc.
June 1999
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SECTION 6 - SUB-BASIN DESCRIPTION
Based on available topography and site visits, no significant offsite runoff is
tributary to the development portion of the site Therefore, there is no need to
oversize the proposed storm drainage facilities to accommodate offsite runoff
SECTION 7 - ANALYSIS OF 100-YEAR FLOOD
The site is mapped as flood zone "C" by FEMA. FEMA defines Zone "C" as
"areas of minimal flooding"
SECTION 8 - AESTHETIC CONSIDERATIONS FOR STORMWATER
FACILITIES
Stormwater facilities will be landscaped in accordance with City of Yelm
requirements, The retention pond and wet pond facilities will have irregular
shapes and side slopes will be vegetated and landscaped. The conveyance
swale along the access road will be hydroseeded.
SECTION 9 - DOWNSTREAM ANALYSIS AND FACILITY SIZING
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Calculations for project retention and treatment systems are described in
Appendix III of this report. All project runoff will be treated and stored onsite
within the proposed stormwater system Therefore, a downstream analysis was
deemed unnecessary
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SECTION 10 - COVENANTS, DEDICATIONS, EASEMENTS
Drainage facilities, including the conveyance swale, wet pond, and retention
pond facilities, will require occasional maintenance The drainage facilities will
be maintained by the City of Yelm Site development will allow City access to the
stormwater facilities for the purposes of inspection, maintenance, water-quality
monitoring, ana other activities as allowed by ordinance
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June 1999
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PART II EROSION CONTROL REPORT
SECTION 1 - CONSTRUCTION SEQUENCE AND PROCEDURE
Final design 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 shall be
achieved by a combination of structural/vegetative cover measures and
construction practices tailored to fit the site
Best Construction Management Practices (BMP's) will be employed to properly
clear and grade the site and to schedule construction activities Before any
construction begins on-site, erosion control facilities shall first be installed The
planned construction sequence may be as follows
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1 Install rock construction entrance Use quarry spalls or rip rap with 12"
minimum depth
2. Install filter fabric fencing, if needed
3 Construct temporary sedimentation basins, if necessary
4 Clear site (grubbing and rough grading)
5 During October 1 st through April 30th, all disturbed areas greater than 5,000
sf that are subject to erosion should be stabilized by one of the following
mulch, sodding, or plastic covering
6 Install underground utilities (storm, water, power, etc.)
7 Provide catch basin protection by installing filter fabric between frame and
grate of all inlets to drainage system
8 After paving is complete, install landscape, sod and/or seed, and mulch all
disturbed areas
9 Maintain all erosion control facilities until the entire site is stabilized and silt
runoff ceases.
10 Designate an area for washing of equipment and concrete trucks to control
the runoff and eliminate entry into storm drainage systems
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SECTION 2 - TRAPPING SEDIMENT
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The onsite soils belong to the Spanaway soil group and have a slight erosion
potential according to the SCS Filter fabric fencing shall be installed where
appropriate, to control erosion from disturbed areas A stabilized construction
entrance shall be installed 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 the paved surface prior to washing down pavement.
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SECTION 3 - PERMANENT EROSION CONTROL & SITE RESTORATION
All disturbed areas will be paved, covered with gravel surfacing, covered with a
building or landscaped with grass, shrubbery or trees per the landscaping plans,
or as specified on the final development plans
John Knowles & Associates, Inc,
June 1999
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SECTION 4 - GEOTECHNICAL ANALYSIS AND REPORT
Slopes exceeding 15% do not exist onsite. Therefore, a geotechnical analysis
was deemed unnecessary
SECTION 5 - INSPECTION SEQUENCE
In addition to the normal City inspections, the Project Engineer must inspect the
facilities related to stormwater treatment, erosion control, storage and
conveyance during construction At a minimum, the following items should be
inspected at the time specified
1 The erosion control facilities should be inspected before the start of clearing
and grading to ensure the following structures are in place
-- ~--_.- a. Construction Entrance
b Filter Fabric Fences (if needed)
c. Inlet Protection
2, The drainage systems will be inspected after construction of the facility, but
before the project is completed to ensure the following are in working order'
a Retention pond and wet pond
b Conveyance swale
c. Catch basins
3 The permanent site restoration measures should be inspected after
landscaping is completed
It is the responsibility of the owner/developer to inform the engineer of the timing
of the above construction phases. A final inspection shall be performed to verify
final grades, drainage construction, and all necessary information to complete
Engineer's Construction Inspection Report Form This form must be completed
prior to final public works construction approval
SECTION 6 - CONTROL OF POLLUTANTS OTHER THAN SEDIMENTS
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Washout from a concrete truck shall not be dumped into the storm drain, or onto
soil and pavement, which carries stormwater runoff It can be dumped into a
designated area to be later back-filled or hardened and broken up for disposal
into a dumpster The owner shall designate a washdown area for equipment and
concrete trucks
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June 1999
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PART III MAINTENANCE PLAN
SECTION 1 - REQUIRED MAINTENANCE
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The drainage facilities will require occasional maintenance The following
general requirements are the minimum requirements. Yearly maintenance costs
can be estimated as
TASK DESCRIPTION
COST
Maintain grass within conveyance swale @ $40 DO/week
x 13 weeks
Remove silt from catch basins @ $200 DO/year
Pruning/landscaping @ $200 DO/year
$520 00
$200 00
$200.00
TOTAL
$920 00
The required maintenance for the proposed storm drainage facilities and
frequency of maintenance are as described in the following checklists
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June 1999
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ATTACHMENT "An (CONTINUED)
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Maintenance Checklist for Catch Basins and Inlets
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Frequency Drainage .J Problem Conditions to Check For Conditions That Should
System Exist
Feature
M,S General Trash, debris, Trash or debris in front of the No trash or debris is
and sediment in catch basin opening is blocking located immediately in
or on basin, capacity by more than 10%, front of catch basin
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 basin is dug out and clean.
to invert of the lowest pipe into
or out of the basin.
M Trash or debris In any inlet or Inlet and outlet pipes free
pipe blocking more than 1/3 of of trash or debris.
its height.
M Structural Comer of frame extends more Frame is even with curb.
damage to than 3/4 inch past curb face
frame and/or top into the street (if applicable)
slab
M Top slab has holes larger than Top slab is free of holes
2 square inches or cracks and cracks.
wider than 1/4 inch (intent is to
make sure all material is
running into the basin).
M Frame not sitting flush on top Frame is sitting flush on
slab, Le., separation of more top slab.
than 3/4 Inch of the frame from
the top slab.
A Cracks in basin Cracks wider than 1/2 inch and Basin replaced or repaired
walls/bottom longer than 3 feet, any to design standards.
evidence of soil particles Contact a professional
entering catch basin through engineer for evaluation.
cracks, or maintenance person
judges that structure is
unsound.
A Cracks wider than 1/2 inch and No cracks more than 1/4
longer than 1 foot at the joint of inch wide at the joint of
any inleVoutlet pipe or any inleVoutlet pipe. Contact a
evidence of soil particles professional engineer for
entering catch basin through evaluation,
cracks.
A SettlemenVmis- Basin has settled more than 1 Basin replaced or repaired
alignment inch or has rotated more than 2 to design standards.
Contact a professional
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inches out of alignment. engineer for evaluation.
M,S Fire hazard or Presence of chemicals such as No color, odor, or sludge.
other pollution natural gas, oil, and gasoline. Basin is dug out and clean.
Obnoxious color, odor, or
sludge noted.
M,S Outlet pipe is Vegetation or roots growingin No vegetation or root
clogged with Inlet/outlet pipe joints 'that is growth present.
vegetation more than 6" tall and less than
6" apart.
If you are unsure whether a problem exists, please contact a professional engineer
Comments:
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KEY
A = Annual (March or April preferred)
M = Monthly (see schedule)
S = After major storms (use 1-inch in 24 hours as guideline)
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Ponds
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Frequency Drainage .J Problem Conditions to Check For Conditions That
System Should Exist
Feature -.,
M.S General Trash & debris Dumping of yard wastes Remove trash and
buildup in pond such as grass clippings debris and dispose as
and branches into basin. prescribed by the
Unsightly accumulation of County
nondegradable 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 the
County
M Poisonous Any poisonous vegetation Remove poisonous
vegetation which may constitute a vegetation. Do not
hazard to the public. spray chemicals on
Examples of poisonous vegetation without
vegetation include: tansy obtaining guidance from
ragwort. poison oak, the Cooperative
stinging nettles, Extension Service and
devilsclub. approval from County
M,S Fire hazard or Presence of chemicals Find sources of
pollution such as natural gas, oil, pollution and eliminate
gasoline, obnoxious color, them. Water is free
odor, or sludge noted. from noticeable color,
odor, or contamination
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, plants ponds. Grass cutting
are sparse or invasive unnecessary unless
species are present. dictated by aesthetics
For wetland ponds,
hand-plant nursery-
grown wetland plants in
bare areas. Contact the
Cooperative Extension
Service for direction on
invasive species such
as purple loosestrife
and reed canary grass.
Pond bottoms should
- - bave uniform coverage
of designed plant
species.
M Rodent holes Any evidence of rodent Rodents destroyed and
holes if facility is acting as dam or berm repaired,
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a dam or berm, or any Contact the T acoma-
evidence of water piping Pierce 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 maintenance Contact Cooperative
activities or when Extension Service for
mosquitoes become a guidance.
nuisance.
A Tree growth Tree growth does not Trees do not hinder
allow maintenance access maintenance activities.
or interferes with Selectively cultivate
maintenance activity (e.g., trees such as alders for
slope mowing, silt firewood.
removal, or equipment
movements). If trees are
not Interfering with
access, leave trees alone.
M Side slopes of Erosion on Check around inlets and Find causes of erosion
pond berms or at outlets for signs of and eliminate them.
entrance or erosion. Check berms for Then slopes should be
exit signs of sliding or settling, stabilized by using
Action is needed where appropriate erosion
eroded damage over 2 control measures(s);
inches deep and where e,g., rock reinforcement,
there is potential for planting of grass,
continued erosion. compaction.
M Storage area Sediment Accumulated sediment Sediment cleaned out to
build-up in that exceeds 10% of the designed pond shape
pond. designed pond depth, and depth; pond
Buried or partially buried reseeded if necessary
outlet structure probably to control erosion.
indicates significant
sediment deposits.
A Pond dikes Settlements Any part of dike which has Dike should be built
settled 4 inches lower back to the design
than the design elevation. elevation.
A Emergency Rock missing Only one layer of rock Replace rocks to design
overflow/spill- exists above native soil in standards.
way area 5 square feet or
larger, or any exposure of
native soil.
One time Emergency Overflow Side of pond has no area Contact the County for
overflow/spill- missing with large rocks to handle guidance.
way emergency overflows.
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If you are un;;ure whether a problem exists, please contact the Jurisdiction and ask for technical
assistance.
Comments.
Key' A = Annual (March or April preferred)
M = Monthly
S = After major storms
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ATTACHMENT "A" (CONTINUED)
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Maintenance Checklist for Infiltration Systems
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Frequency Drainage .J Problem Conditions to Check For Conditions That Should
System Exist
Feature
M,S General Trash & See Maintenance Checklist for See Maintenance Checklist
debris buildup Ponds. for Ponds,
in pond
M Poisonous See Maintenance Checklist for See Maintenance Checklist
vegetation Ponds. for Ponds.
M,S Fire hazard or See Maintenance Checklist for See Maintenance Checklist
pollution Ponds. for Ponds.
M Vegetation See Maintenance Checklist for See Maintenance Checklist
not growing or Ponds. for Ponds.
is overgrown
M Rodent holes See Maintenance Checklist for See Maintenance Checklist
Ponds. for Ponds.
M Insects See Maintenance Checklist for See Maintenance Checklist
Ponds. for Ponds.
A Storage area Sediment A soil texture test indicates Sediment is removed
buildup in facility is not working at its and/or facility is cleaned so
system designed capabilities or was that infiltration system
incorrectly designed, works according to design,
A sediment trapping area is
installed to reduce
sediment transport into
infiltration area.
A Storage area A soil texture test Indicates Additional volume is added
drains slowly facility is not working at its through excavation to
(more than 40 designed capabilities or was provide needed storage.
hours) or incorrectly designed. Soil is aerated and
overflows rototilled to improve
drainage. Contact the
County for information on
its requirements regarding
excavation.
M Sediment Any sediment and debris filling Clean out sump to design
trapping area area of 10% of depth from depth.
sump bottom to bottom of
outlet pipe or obstructing flow
into the connector pipe.
One time Sediment Stormwater enters Infiltration Add a trapping area by
trapping area area directly without treatment. constructing a sump for
not present settling of solids,
Segregate settling area
from rest of facility
Contact the County for
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Frequency Drainage .J Problem Conditions to Check For Conditions That Should
System Exist
Feature
guidance.
M Rock filters Sediment and By visual Inspection little or no Replace gravel in rock
debris water flows through filter filter
during heavy rain stanns.
If you are unsure whether a problem exists, please contact the Jurisdiction and ask for technical
assistance.
Comments.
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Key' A = Annual (March or April preferred)
M = Monthly
S = After major storms
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ATTACHMENT" (CONTINUED)
Mamtenance ChecklIst for Conveyance Systems (Pipes, DItches, and Swales)
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 pipe.
M Vegetation Vegetation that reduces free All vegetation removed
movement of water through so water flows freely
pipes. through pipes
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 (Le , 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 Open Trash & Dumping of yard wastes Remove trash and
ditches debris such as grass clippings and debris and dispose as
branches into basin. prescribed by the
Unsightly accumulation of County
non-degradable materials
such as glass, plastic,
metal, foam and coated
paper
M Sediment Accumulated sediment that Ditch cleaned of all
buildup exceeds 20% of the design sediment and debris so
depth that it matches design
A Vegetation Vegetation (e.g., weedy Water flows freely
shrubs or saplings) that through ditches Grassy
reduces free movements of vegetation shall be left
water through ditches, alone,
M Erosion See Ponds Checklist. See Ponds Checklist.
damage to
slopes
A Rock lining Maintenance person can Replace rocks to design
out of place see native soil beneath the standard.
or missing (if rock lining.
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Frequency Drainage '" Problem Conditions to Check For ~ondltlons That
System Should Exist
Feature
applicable)
Varies Catch See Catch Basins Checklist. See Catch Basins
basins Checklist.
M,S Swales Trash & See above for Ditches. See above for Ditches.
debris
M Sediment See above for Ditches. Vegetation may need to
buildup be replanted after
cleaning.
M Vegetation Grass cover is sparse and Aerate soils and reseed
not growing seedy or areas are and mulch bare areas.
or overgrown with woody Maintain grass height at
overgrown vegetation. a minimum of 6 inches
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 Swale has been filled in or If possible, speak with
by blocked by shed, woodpile, homeowner and request
homeowner shrubbery, etc. that swale area be
to restored. Contact the
incompatible County to report problem
use if not rectified voluntarily
A Swale does Water stands in swale or A survey may be needed
not drain flow velocity is very slow to check grades.
Stagnation occurs. Grades need to be in 1-
5% 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
S = After major storms
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Fencing/Shrubbery Screen/Other Landscaping
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Frequency Drainage ..J Problem Conditions to Check Conditions That
System For Should Exist
Feature
M General Missing or Any defect in the fence Fence is mended or
broken or screen that permits shrubs replaced to form
parts/dead easy entry to a facility a solid barrier to entry
shrubbery
M,S Erosion Erosion has resulted in Replace soil under
an opening under a fence so that no
fence that allows entry by opening exceeds 4
people or pets. inches in height.
M Unruly Shrubbery is growing out Shrubbery is trimmed
vegetation of control or is infested and weeded to provide
with weeds. appealing aesthetics.
Do not use chemicals to
control weeds.
A Wire fences Damaged parts Posts out of plumb more Post plumb to within 1-
than 6" 1/2 inches of plumb.
A Top rails bent more than Top rail free of bends
6 inches. greater than 1 inch,
A Any part of fence Fence is aligned and
(including posts, top meets design
rails, and fabric) more standards.
than 1 foot out of design
alignment.
A Missing or loose tension Tension wire in place
wire. and holding fabric.
A Missing or loose barbed Barbed wire in pla<:e
wire that is sagging more with less than 3/4 sag
than 2-1/2" between between posts.
posts.
A Extension arm missing, Extension arm in place
broken, or bent out of with no bends larger
shape more than 1-1/2 than 3/4 inch,
inches.
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Grounds (Landscaping)
Frequency Drainage v Problem Conditions to Check For Conditions That
System Should Exist
Feature
M General Weeds (non- Weeds growing in more than Weeds present in less
poisonous) 20% of the landscaped area than 5% of the
(trees and shrubs only). landscaped area.
M Insect hazard Any presence of poison ivy No poisonous
or, other poisonous vegetation or insect
vegetation or insect nests. nests present in
landscaped area.
M,S Trash or litter See Ponds Checklist. See Ponds Checklist.
M,S Erosion of Noticeable rills are seen in Causes of erosion are
ground landscaped areas. identified and steps
surface taken to slow
down/spread out the
water Eroded areas
are filled, contoured, and
seeded.
A Trees Damage Limbs or parts of trees or Trim trees/shrubs to
and shrubs that are split or restore shape, Replace
shrubs broken which affect more trees/shrubs with severe
than 25% of the total foliage damage.
of the tree or shrub.
M Trees or shrubs that have Replant tree, inspection
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
not adequately supported or rubber-coated ties
are leaning over, causing around young
exposure of the roots, trees/shrubs for support.
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
S = After major storms
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A Deteriorated Part or parts that have a Structurally adequate
paint or rusting or scaling posts or parts with a
protective condition that has uniform protective
coating. affected structural coating.
adequacy
M Openings in Openings in fabric are No openings in fabric.
fabric such that an 8-lnch
diameter ball could fit
through.
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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
S = After major storms
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ATTACHMENT "A" (CONTINUED)
Maintenance Checklist for Access Roads/Easements
Frequency Drainage ..J Problem Conditions to Check Conditions That
System For Should Exist
Feature
One Time General No access If ponds or other Determine whether an
road exists drainage system easement to drainage
features needing feature exists. If yes,
maintenance by obtain County permits
motorized equipment and construct gravel
are present, either an (or equal) access
access road or access road. If not, report
from public streets is lack of easement to
required. the municipality
M Blocked Debris which could Roadway free of
roadway damage vehicle tires debris which could
(glass or metal). damage tires.
A Any obstructions which Roadway overhead
reduce clearance above clear to 14 feet high.
road surface to less
than 14 feet.
A Any obstructions Obstruction removed
" restricting the access to to allow at least a 15-
less than 15 feet width. foot wide access.
A,S Road Settlement, When any surface Road surface
surface potholes, irregularity exceeds 6" uniformly smooth
mush spots, in depth and 6 sf in wino evidence of
ruts. area. In general, any settlement, potholes,
surface defect which mush spots or ruts,
hinders or prevents Occasional
maintenance access. application of
additional gravel or
pitrun rock needed.
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M Vegetation in Woody growth that Remove woody
road surface could block vehicular growth @ early stage
access, Excessive to prevent vehicular
weed cover blockage. Cut back
weeds if they begin to
encroach on road
surface
M,S Shoulders Erosion Erosion within 1 foot of Shoulder free of
and ditches damage the roadway more than erosion and matching
8" wide and 6" deep the surrounding road
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
S = After major storms
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Yelm Public Works Yard and Public Safety Building
SECTION 2 - RESPONSIBLE ORGANIZATION
The City of Yelm shall be responsible for the operation and maintenance of all
onsite drainage facilities
SECTION 3 - VEGETATION MANAGEMENT PLAN
All disturbed pervious areas within the site will be landscaped to provide an
aesthetically pleasing environment.
SECTION 4 - SOURCE CONTROL
Warning signs (e g . "Dump No Waste - Drains to Groundwater") will be painted
or embossed on or adjacent to all storm drain inlets and shall be repainted
periodically as necessary
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John Knowles & Associates, Inc.
June 1999
Page 9
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APPENDIX I
Preliminary Drainage Plan
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Soils Information
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Date.
Soils Logged By'
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SIte DescrIptIOn.
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Soil Logs.
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Depth
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0" to 20"
20"to 36"
36"to 50"
50"to 60"
60"to 102"
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Depth
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0" to 16"
16"to 32"
32"to 84"
84"to 96"
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Yelm Public Works Yard and Pubic Safety Building
JKA #98006
On-site Soils Analysis
June 18, 1999
RB Engllleerlllg
Robert Balmelh PE
CIty ofYelm
Rhoton Road
See sIte plan for soil log locatIOns
Test Hole #1
Texture and Color
Soil Type
Test PIt Surface ElevatIOn = 325 ft
/
Black Gravelly Sandy Loam
YellowIsh Brown Extremely Gravelly Sand
Grey Extremely Gravelly Sand
Extremely Gravelly Sand w/Clay Coatlllg on Gravel
Medmm Sand
Water Seeplllg @ 108"
Class 4
Class 1
Class 1
Class 1
Class 2
Test Hole #2
Texture and Color
Soil Type
Test PIt Surface ElevatIOn = 324 ft
Black Gravelly Sandy Loam
YellowIsh Brown Extremely Gravelly Sand
Grey Extremely Gravelly Sand
MedIUm Sand
Water Seeplllg @ 96"
Class 4
Class 1
Class 1
Class 2
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.-Q..~_': :;ro~
-..-.:.. .
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Thurston County Washington
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Included areas make up about 10 percent of the total
acreage
Permeability is moderately rapid in the Spana soil
Available water capacity IS moderate Effective rooting
depth is 20 to 40 inches A seasonal high water table is
at a depth of about 12 to 36 inches from November to
April Runoff IS slow and the hazard of water erosion is
Slight
Most areas are used as hayland and pasture This
unit is suited to hay and pasture The main limitations
are the seasonal high water table and the moderate
available water capacity Proper stocking rates, pasture
rotation and restricted grazing during wet periods help
to keep the pasture in good condition and protect the
soil from erosion Rotation grazing helps to maintain the
quality of forage Periodic mowing helps to maintain
uniform growth discourages selective grazing, and
controls weeds In most years irrigation is needed for
maximum production 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
A few areas are used as woodland On the basis of a
1 aO-year site curve the estimated site Index for
Douglas-fir IS 144 On the basis of a 50-year site curve,
it is 110 The estimated growth rate of an unmanaged
even-aged stand of Douglas-fir is 150 cubic feet per
acre per year at 60 years of age
The main limitation affecting the harvesting of timber
IS the muddiness caused by seasonal wetness Use of
wheeled and tracked equipment when the soil is wet
results in ruts and soil compaction Unsurfaced roads
and skid trails are soft and can be impassable when
O wet. Logging roads require suitable surfacing material
for year-round use Rounded pebbles and cobbles for
road construction are readily available on this unit. The
O seasonal high water table limits the use of equipment to
dry periods Disturbance of the protective layer of duff
can be minimized by the careful use of wheeled and
tracked equipment
O Seedling establishment is the main concern in the
production of timber Reforestation can be
accomplished by planting Douglas-fir seedlings If the
O stand Includes seed trees natural reforestation by red
alder OCcurs periodically in cutover areas The seasonal
high water table inhibits root respiration and thus results
Din some seedling mortality When openings are made in
the canopy invading brushy plants can prevent the
establishment of planted Douglas-fir seedlings
Common forest understory plants are cascade
Oregon-grape salal vine maple, western brackenfern,
and Oregon white oak
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This map unit is in capability subclass IlIw
r-- 11 O-Spanaway gravelly sandy loam, 0 to 3
percent slopes. This very deep, somewhat excessively
drained soil IS on terraces It formed in glacial outwash
and volcanic ash The native vegetation is mainly
grasses, ferns, and a few conifers Elevation is 100 to
400 feet. The average annual precipitation is 45 to 55
inches, the average annual air temperature is about 51
degrees F and the average frost-free period is 150 to
200 days
Typically, the surface layer is black gravelly sandy
loam about 15 inches thick The subsoil is dark
yellowish brown very gravelly loam about 5 inches thick
The substratum to a depth of 60 inches or more is dark
yellowish brown extremely gravelly sand
Included in this unit are small areas of Alderwood
soils on till plains, Everett, Indianola, and Nisqually soils
on outwash terraces, and Spana soils in depressions
Also included are small areas of Spanaway soils that
have a stony sandy loam surface layer and small areas
of Spanaway gravelly sandy loam that have slopes of 3
to 15 percent. Included areas make up about 20
percent of the total acreage
Permeability is moderately rapid in the subsoil of the
Span away soil and very rapid in the substratum
Available water capacity is low Effective rooting depth
is 60 inches or more Runoff is slow, and the hazard of
water erosion is slight.
This unit IS used mainly as hayland, pasture or
cropland, as a site for homes, or as a source of gravel
It is also used as woodland
The main limitation affecting hay and pasture is the
low available water capacity Proper grazing practices,
weed control, and fertilizer are needed to ensure
maximum quality of forage Rotation grazing helps to
maintain the quality of forage Periodic mowing helps 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
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. SprinklerS can be used but a slow application rate is
needed to minimize runoff The amount of water applied
should be sufficient to wet the root zone but small
enough to minimize the leaching of plant nutrients The
application rate should be adjusted to the available
water capacity the water intake rate, and the needs of
the crop Animal manure can be applied periodically
during the growing season Areas that receive heavy
applications should be harrowed at least once a year
This unit is well suited to homesites Pebbles and
cobbles should be removed, particularly in areas used
for lawns In summer irrigation is needed for lawn
grasses shrubs vines shade trees, and ornamental
trees Mulch fertilizer and irrigation are needed to
establish lawn grasses and other small-seeded plants
The main limitation affecting septic tank absorption
fields IS a poor filtering capacity If the density of
housing is moderate or high, community sewage
systems are needed to prevent the contamination of
water supplies caused by seepage from onsite sewage
disposal systems Cutbanks are not stable and are
subject to sloughing
Douglas-fir is the main woodland species on this unit.
Among the trees of limited extent are Oregon white oak,
lodgepole pine and red alder Douglas-fir and Scotch
pine are grown on Christmas tree plantations On the
basis of a 1 OO-year site curve, the mean site index for
Douglas-fir IS 140 On the basis of a 50-year site curve,
it is 108 The highest average growth rate of an
unmanaged even-aged stand of Douglas-fir is 145
cubic feet per acre per year at 65 years of age
This soil is suited to year-round logging Unsurfaced
roads and skid trails are slippery when wet. Logging
roads reqUire suitable surfacing material for year-round
use Rounded pebbles and cobbles for road
construction are readily available on this unit.
Disturbance of the protective layer of duff can be
minimized by the careful use of wheeled and tracked
equipment
Seedling establishment and seedling mortality are the
main concerns in the production of timber Reforestation
can be accomplished by planting Douglas-fir seedlings
If the stand includes seed trees, natural reforestation by
Douglas-fir Oregon white oak, and lodgepole pine
occurs periodically in cutover areas. Droughtiness in the
surface layer reduces the seedling survival rate When
openings are made in the canopy, invading brushy
plants can delay the establishment of planted Douglas-
fir seedlings
Common forest understory plants are cascade
Oregon-grape, salal, western brackenfern, western
swordfern Indian plum and Scotch-broom
Soil Survey
~hiS map unit is in capability subclass IVs
111-Spanaway gravelly sandy loam, 3 to 15
'percent slopes. This very deep, somewhat excessively
drained soil is on terraces It formed in glacial outwash
and volcanic ash The native vegetation is mainly
grasses, ferns, and a few conifers Elevation is 100 to
400 feet. The average annual precipitation is 45 to 55
Inches, the average annual air temperature is about 51
degrees F, and the average frost-free period is 150 to
200 days
TYPically, the surface layer is black gravelly sandy
loam about 15 inches thick. The subsoil is dark
yellowish brown very gravelly sandy 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 and Everett Indianola, and Nisqually
soils on terraces Also included are small areas of
Span away soils that have a stony sandy loam surface
layer and small areas of Spanaway gravelly sandy loam
that have slopes of 0 to 3 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 or pasture, as a
site for homes, or as a source of gravel It is also used
as woodland
The main limitation affecting hay and pasture is the
low available water capacity during the growing season
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 homesites The main limitation
is the slope Cutbanks are not stable and are subject to
sloughing A plant cover can be established and
maintained through proper fertilizing, seeding, mulching
and shaping of the slopes Pebbles and cobbles should
be removed, particularly in areas used for lawns In
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8
APp.ENDIX III
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Preliminary Drainage Calculations
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DRAINAGE CALCULA liONS
Yelm Public Works Yard
and Public Safety Building
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Proiect Information
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A.
References.
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1 Washington State Department of Ecology Stormwater Management Manual
for the Puget Sound Basin
2. WaterWorks analysis software program
3 SCS Soils Mapping for Thurston County
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Area Summary'
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'post-Development Basin Summa~
Basin A . Basin B Basin C Basin D Total
(Ac) (Ac) (1 )
Impervious Roof 0.24 017 00 00 041
Impervious 067 099 0.28 1 19 313
Roadwav
Disturbed Pervious 2.83 0.22 019 1 18 442
Undisturbed 000 000 00
Pervious (3)
Subtotal 3.74 138 047 2.37 796
Total
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Note (1) Basin D areas are assumed based on future development using a 50%
impervious surface area, including road and roof areas.
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Soil Classificationllnfiltration
1 SCS Soils Classification Spanaway Gravelly Sandy Loam
2. Hydrologic Group B
3 Site Infiltration Rate 20"/hr
4 Design Site Infiltration Rate. 13"/hr
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SCS Runoff Curve Number' (TR55 - Manual)
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Post-development (disturbed pervious area)
86 CN
Post-development (impervious area)
98 CN
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June 1999
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Detailed Calculations
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A.
Wet pond sizing calculations
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The Washington State Department of Ecology Stormwater Manual requires that
the 6-month storm event be used to size wet pond facilities Therefore, we have
calculated the volume of water generated by a 6-month storm using the
guidelines from the DOE SWMM To determine the 6-month storm event, we
multiplied the two-year rainfall event of 2" by a factor of 64 and used this as the
rainfall for the WaterWorks model This resulted in the following 6-month storm
event volumes for Basins A, B, and 0 The following table summarizes the
results of the WaterWorks modeling
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Wet Pond Sizing Summarv
Basin Impervious Area (1) Required
Volume (2) (cf)
A o 91 ac 3,400 cf Public Works Yard
B 1 16 ac 4,344 cf Public Safety BuildinQ
0 1 19 ac 4,456 cf Future Development
Total 3.26 ac 12,200 cf
(1) Includes roof area
(2) Volume for 6-month storm event using WaterWorks hydrology software
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Wet Pond Stage Storage -
Elevation
Volume
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Pond bottom
Permanent pool
l' freeboard
3190
3230
3240
o cf
12,900 cf
N/A
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The total required wet pond volume of 12,200 cf is less than the permanent pool
volume provided in the proposed wet pond of 12,900 cf The calculated volume
of 12,200 cf includes the future development of sub-basin 0 with a 50%
impervious surface assumption
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B
Minimum Stormwater Storage Volume Required'
For preliminary design purposes, a 13"/hr infiltration rate was used to determine
minimum storage requirements
Using an infiltration rate of 13"/hr and the WaterWorks modeling hydrology
software, the required storage volume for Basins A, B, and 0 was 9,100 cf
Storm runoff from Basin C (Rhoton Road) does not drain to the proposed
retention pond area,
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June 1999
11I-2
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Yelm Public Works Yard and Public Safety Building
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Retention Pond Volume Provided
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Pond bottom surface area @ EL 320 0 = 3,112 SF
Pond water surface area @ EL 323 ,0 = 6,112 SF
Volume between EL 320 and 323 = ((3,112 SF + 6112 SF)/2) x 3'
=13,836 SF > 9,100 CF OK!
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Conclusion. Drainage from basins A, B, and D can be stored and
infiltrated within the proposed retention pond utilizing 3 1 side slopes and
an infiltration rate of 13"/hr The pond design incorporates an excess of
4,800 cf that could be used if greater than 50% impervious surface is
used for future development of Basin D; or, the excess storage volume
potential can be applied toward the "correction factor" as required by
DOE.
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June 1999
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Yelm Public Works Yard and Public Safety Building
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IV.
Storm System Vertical Data:
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Retention Pond Bottom Elevation
= 3240
= N/A
= 3230
= N/A
= 3200
= 3190
= 3200
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Wet Pond and Retention Pond Crest Elevation
Retention Pond Secondary Overflow Spillway Elevation
Wet Pond Overflow Elevation
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Wet Pond Outlet Pipe IE
Wet Pond Bottom Elevation
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Water Quality Trench Bottom Elevation (at drainrock bottom)
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June 1999
11I-4
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-APPENDIX IV
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WaterWorks Data Output - Basin A, B, and D
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Q100 YR STORM EVENTS
YELM PW YARD
page
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---------------------------------------------------------------------
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BASIN ID: APT 100
SCS METHODOLOGY
TOTAL AREA........
RAINFALL TyPE....:
PRECIPITATION.....
TIME INTERVAL.. ..:
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BASIN SUMMARY
NAME. Q100 YR STORM EVENT
3.74 Acres BASEFLOWS: 0.00 cfs
TYPE1A PERV
4.00 inches AREA. . : 2.83 Acres
10.00 min CN . 86.00
. . . .
TC.... . 9.57 min
ABSTRACTION COEFF. 0.20
TcReach - Sheet L: 65.00
TcReach - Shallow L: 200.00
TcReach - Channel L: 275.00
PEAK RATE: 2.50 cfs VOL.
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BASIN ID: BPT 100
SCS METHODOLOGY
TOTAL AREA........
RAINFALL TYPE. ...:
PRECIPITATION... .:
TIME INTERVAL.....
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ns:0.1500 p2yr: 2.00
ks:27 00 s:0.0150
kc.17.00 s:0.0200
0.86 Ac-ft TIME:
s:0.0400
500 min
NAME' Q100 YR STORM EVENT
1.38 Acres
TYPE1A
4.00 inches
10.00 min
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ABSTRACTION COEFF: 0.20
PEAK RATE. 1 17 cfs VOL.
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BASIN ID CPT_100
SCS METHODOLOGY
TOTAL AREA.. .. .:
RAINFALL TYPE
PRECIPITATION.. '"
TIME INTERVAL... .
o
BASEFLOWS.
0.00 cfs
PERV
0.22 Acres
86.00
5 00 min
AREA. . :
CN.... :
TC.. .
0.40 Ac-ft TIME.
500 min
NAME' Q100 YR STORM EVENT
0.47 Acres
TYPE1A
4.00 inches
10.00 min
ABSTRACTION COEFF: 0.20
TcReach - Sheet L. 65.00
TcReach - Shallow L: 200.00
TcReach - Channel L: 275 00
PEAK RATE: 0.36 cfs VOL:
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BASEFLOWS.
0.00 cfs
PERV
0.19 Acres
86.00
5 00 min
AREA. :
CN.... :
TC. . . . :
ns:0.1500 p2yr: 2.00
ks:27 00 s'0.0150
kc'17 00 s'0.0200
0.12 Ac-ft TIME:
s:O 0400
500 min
IMP
0.91 Acres
98.00
9.57 min
IMP
1 16 Acres
98 00
5 00 min
IMP
0.28 Acres
98 00
5.00 min
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Q100 YR STORM EVENTS
YELM PW YARD
._~___,....... .~___ ,_.----0 _~--=-""'--.
page
2
====~================================================================
BASIN ID: DPT_100
SCS METHODOLOGY
TOTAL AREA.......:
RAINFALL TyPE....:
PRECIPITATION. ..:
TIME INTERVAL....:
BASIN SUMMARY
NAME: Q100 YR STORM EVENT
BASEFLOWS:
2.37 Acres
TYPE1A
4.00 inches
10.00 min
ABSTRACTION COEFF: 0.20
TcReach - Sheet L: 65.00
TcReach - Shallow L: 200.00
TcReach - Channel L: 275.00
PEAK RATE: 1.84 cfs VOL.
AREA. . :
CN. . . . :
TC. . . . :
0.00 cfs
PERV
0.95 Acres
86.00
10.00 min
s:0.04DO
ns:0.1500 p2yr: 2.00
ks:27.00 s:0.0150
kc:17.00 s:0.0200
0.63 Ac-ft TIME:
500 min
IMP
1.42 Acres
98.00
10.00 min
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6:52:55 pm
Q6 MONTHR STORM EVENTS
page
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YELM PW YARD
---------------------------------------------------------------------
---------------------------------------------------------------------
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BASIN ID: APT 6MNT
SCS METHODOLOGY
TOTAL AREA...... :
RAINFALL TYPE.. ..:
PRECIPITATION....:
TIME INTERVAL. ....
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BASIN SUMMARY
NAME: Q6 MONTH STORM EVENT
0.91 Acres BASEFLOWS' 0.00 cfs
TYPE1A PERV IMP
1. 28 inches AREA. . : 0.00 Acres 0.91 Acres
10.00 min CN. . . . : 0 00 98.00
TC. . . . : 0.00 min 5 00 min
ABSTRACTION COEFF: 0.20
TcReach - Sheet L: 2.00
TcReach - Shallow L: 200.00
TcReach - Channel L: 275.00
PEAK RATE: 0.24 cfs VOL.
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BASIN ID: BPT 6MNT
SCS METHODOLOGY
TOTAL AREA ......:
RAINFALL TYPE. ....
PRECIPITATION....:
TIME INTERVAL. ...:
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nS.0.1500 p2yr:65.00
ks:27.00 s:0.0150
kc:17.00 s:0.0200
o 08 Ac-ft TIME'
490 min
s.O 0400
NAME. Q6 MONTH STORM EVENT
1. 16 Acres
TYPE1A
1 28 inches
10 00 min
BASEFLOWS.
0.00 cfs
PERV
0.00 Acres
0.00
0.00 min
IMP
1 16 Acres
98 00
10 76 min
AREA.. :
CN.... :
TC... .
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ABSTRACTION COEFF' 0.20
TcReach - Sheet L. 60 00
TcReach - Channel L: 450.00
PEAK RATE: 0.30 cfs VOL:
ns.0.1500 p2yr: 2.00 s 0 0200
kc 42.00 s:0.0050
0.10 Ac-ft TIME. 500 min
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SCS METHODOLOGY
TOTAL AREA... . .:
RAINFALL TYPE. ....
PRECIPITATION. .:
TIME INTERVAL... .
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NAME: Q6 MONTH STORM EVENT
0.23 Acres
TYPE1A
1 28 inches
10 00 min
BASEFLOWS:
0.00 cfs
PERV
0.00 Acres
o 00
o 00 min
IMP
0.23 Acres
98.00
5 00 min
AREA.. :
CN. . . . :
TC... :
ABSTRACTION COEFF: 0.20
TcReach - Sheet L. 60 00
TcReach - Channel L: 450.00
PEAK RATE: 0.06 cfs VOL.
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ns:O 1500 p2yr 2.00 s.0.0200
kc 42.00 s:0.0050
o 02 Ac-ft TIME 490 min
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6:52.55 pm
Q6 MONTHR STORM EVENTS
YELM PW YARD
page
1
---------------------------------------------------------------------
---------------------------------------------------------------------
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BASIN ID: APT_6MNT
SCS METHODOLOGY
TOTAL AREA.......:
RAINFALL TYPE.. ..:
PRECIPITATION. ..:
TIME INTERVAL....:
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BASIN SUMMARY
NAME: Q6 MONTH STORM EVENT
0.91 Acres BASEFLOWS: 0.00 cfs
TYPE1A PERV
1. 28 inches AREA.. : 0.00 Acres
10.00 min CN. . . . : 0 00
TC.... : 0.00 min
ABSTRACTION COEFF: 0 20
TcReach - Sheet L: 2.00
TcReach - Shallow L. 200.00
TcReach - Channel L: 275.00
PEAK RATE: 0.24 cfs VOL:
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BASIN ID: BPT 6MNT
SCS METHODOLOGY
TOTAL AREA ......:
RAINFALL TYPE. ....
PRECIPITATION.. ..:
TIME INTERVAL. ....
ns:0.1500 p2yr:65.00
ks:27.00 s:0.0150
kc:17.00 s:0.0200
0.08 Ac-ft TIME:
s:0.0400
490 min
NAME: Q6 MONTH STORM EVENT
1. 16 Acres
TYPE1A
1. 28 inches
10 00 min
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ABSTRACTION COEFF: 0.20
TcReach - Sheet L. 60 00
TcReach - Channel L. 450.00
PEAK RATE: 0.30 cfs VOL:
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BASIN ID: CPT 6MNT
SCS METHODOLOGY
TOTAL AREA..... .:
RAINFALL TYPE. ...
PRECIPITATION.. ..:
TIME INTERVAL... .
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BASEFLOWS:
0.00 cfs
PERV
0.00 Acres
0.00
0.00 min
AREA.. :
CN . . . . :
TC.... :
ns:0.1500 p2yr: 2.00 s'O 0200
kc:42.00 s:0.0050
0.10 Ac-ft TIME. 500 min
NAME: Q6 MONTH STORM EVENT
0.23 Acres BASEFLOWS. 0.00 cfs
TYPE1A PERV
1. 28 inches AREA.. : 0.00 Acres
10 00 min CN. . . . : 0.00
TC . 0 00 min
. .
ABSTRACTION COEFF: 0.20
TcReach - Sheet L. 60 00
TcReach - Channel L: 450 00
PEAK RATE: 0.06 cfs VOL'
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ns:O 1500 p2yr 2.00 s.0.0200
kc.42.00 s'0.0050
o 02 Ac-ft TIME 490 min
IMP
o 91 Acres
98.00
5 00 min
IMP
1 16 Acres
98 00
10 76 min
IMP
0.23 Acres
98 00
5 00 min
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6:52:55 pm
Q6 MONTHR STORM EVENTS
=====================================================================
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BASIN ID' APT 6MNT
SCS METHODOLOGY
TOTAL AREA..... .:
RAINFALL TyPE.....
PRECIPITATION. ..:
TIME INTERVAL.. ...
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YELM PW YARD
BASIN SUMMARY
NAME: Q6 MONTH STORM EVENT
o 91 Acres
TYPE1A
1.28 inches
10.00 min
ABSTRACTION COEFF: 0.20
TcReach - Sheet L. 2.00
TcReach - Shallow L: 200.00
TcReach - Channel L: 275.00
PEAK RATE. 0.24 cfs VOL.
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BASIN ID: BPT 6MNT
SCS METHODOLOGY
TOTAL AREA ......:
RAINFALL TYPE... .
PRECIPITATION....:
TIME INTERVAL..
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ABSTRACTION COEFF
TcReach - Sheet
TcReach - Channel
PEAK RATE: 0.30
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SCS METHODOLOGY
TOTAL AREA.. . ...
RAINFALL TYPE.
PRECIPITATION .. .
TIME INTERVAL .. .
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BASEFLOWS:
0.00 cfs
PERV
0.00 Acres
0.00
0.00 min
AREA.. :
CN. . . . :
TC. . . . :
ns:0.1500 p2yr:65.00
ks:27 00 s:0.0150
kc:17.00 s:0.0200
0.08 Ac-ft TIME:
s.0.0400
490 min
NAME: Q6 MONTH STORM EVENT
1 16 Acres
TYPE1A
1.28 inches
10.00 min
o 20
L. 60 00
L. 450.00
cfs VOL:
BASEFLOWS:
0.00 cfs
PERV
o 00 Acres
0.00
0.00 min
AREA. . :
CN. . . . :
TC.... :
ns:O 1500 p2yr: 2.00 s.0.0200
kc.42.00 s:0.0050
0.10 Ac-ft TIME. 500 min
NAME Q6 MONTH STORM EVENT
o 23 Acres
TYPE1A
1 28 inches
10 00 min
o
ABSTRACTION COEFF: 0 20
TcReach - Sheet L: 60.00
TcReach - Channel L: 450 00
PEAK RATE 0.06 cfs VOL.
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BASEFLOWS:
0.00 cfs
PERV
0.00 Acres
0.00
0.00 min
AREA.. :
CN... :
TC ...:
ns 0 1500 p2yr 2.00 s'0.0200
kc.42.00 s:0.0050
o 02 Ac-ft TIME. 490 min
page
1
IMP
0.91 Acres
98 00
5 00 min
IMP
1.16 Acres
98.00
10 76 min
IMP
0.23 Acres
98 00
5.00 min
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6:52:55 pm
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---------------------------------------------------------------------
---------------------------------------------------------------------
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BASIN ID: DPT 6MNT
SCS METHODOLOGY
TOTAL AREA.......:
RAINFALL TyPE.....
PRECIPITATION.....
TIME INTERVAL.. .:
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1.19 Acres
TYPE1A
1.28 inches
10.00 min
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ABSTRACTION COEFF: 0.20
TcReach - Sheet L. 60.00
TcReach - Channel L: 450.00
PEAK RATE: 0.31 cfs VOL
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YELM PW YARD
BASIN SUMMARY
NAME: Q6 MONTH STORM EVENT
BASEFLOWS:
0.00 cfs
PERV
0.00 Acres
0.00
0.00 min
AREA. . :
CN. . . . :
TC. . . . :
ns:0.1500 p2yr: 2.00 s:0.0200
kc:42 00 s:0.0050
0.10 Ac-ft TIME: 500 min
page
2
IMP
1.19 Acres
98 00
10.00 min
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6:53:41 pm
YELM PW YARD
Q100 YR STORM LEVEL POOL ANALYSIS
page
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---------------------------------------------------------------------
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STAGE STORAGE TABLE
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CUSTOM STORAGE ID No. STO
Description: INFILTRATION POND STORAGE
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STAGE (----STORAGE----) STAGE (----STORAGE----) STAGE (----STORAGE----) STAGE (----STORAGE----)
Cft) ---cf--- --Ac-Ft- Cft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft- (ft) ---cf--- --Ac-Ft-
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320 00
320 10
320.20
320.30
320 40
320 50
320 60
320.70
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0.0000
461. 20
922 40
1384
1845
2306
2767
3228
0.0000
o 0106
o 0212
o 0318
o 0424
o 0529
o 0635
o 0741
320 80
320 90
321 00
321 10
321 20
321.30
321 40
321 50
3690
4151
4612
5073
5534
5996
6457
6918
0.0847
o 0953
o 1059
o 1165
o 1271
o 1376
o 1482
o 1588
321 60 7379
321 70 7840
321 80 8302
321 90 8763
, .-.,---.-...-..-
1.~22 00._____..~.~~,4
322 10 9685
322 20 10146
322.30 10608
o 1694
o 1800
o 1906
0.2012
0.2118
o 2223
o 2329
o 2435
322 40 11069 0 2541
322 50 11530 0 2647
322 60 11991 0 2753
322 70 12452 0 2859
322 80 12914 0 2965
322 90 13375 0 3070
323--00"""',"38361 0 3176
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6:53:41 pm
page
2
YELM PW YARD
Q100 YR STORM LEVEL POOL ANALYSIS
=====================================================================
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STAGE DISCHARGE TABLE
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DISCHARGE LIST ID No. DIS 13
Description: 13"/HR INFILTRATION RATE
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STAGE (--OISCHARGE---) STAGE (--OISCHARGE---) STAGE (--OISCHARGE---) STAGE (--OISCHARGE---)
( ftl ---cfs-- ------- ( ftl ---cfs-- ------- ( ftl ---cfs-- ------- ( ftl ---cfs-- -------
320 00 1 8400 321.10 1 8400 322 20 1. 8400 323 30 1 8400
320 10 1 8400 321 20 1 8400 322 30 1 8400 323 40 1 8400
320 20 1. 8400 321 30 1 8400 322.40 1 8400 323 50 1 8400
320.30 1 8400 321 40 1 8400 322 50 1. 8400 323 60 1 8400
320 40 1 8400 321.50 1 8400 322.60 1 8400 323 70 1 8400
320.50 1 8400 321 60 1 8400 322 70 1 8400 323 80 1 8400
320 60 1 8400 321 70 1 8400 322 80 1 8400 323 90 1 8400
320 70 1 8400 321 80 1 8400 322 90 1 8400 324 00 1 8400
320.80 1 8400 321 90 1 8400 323 00 1 8400
320.90 1. 8400 322 00 1 8400 323.10 1 8400
321 00 1 ~oo 322 10 1 8400 323.20 1 8400
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6/7/99
6:53:42 pm
page
3
YELM PW YARD
Q100 YR STORM LEVEL POOL ANALYSIS
=====================================================================
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LEVEL POOL TABLE SUMMARY
MATCH INFLOW -STO- -OIS- (-PEAK-> STORAGE
(--------OESCRIPTION---------> (cfs) (ds) --id- --id- (-STAGE> id VOL (cO
0100 YR STORM
0.00 5.51 STO OIS_13 321 97 1 9100 42 cf
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APPENDIX V
c
WaterWorks Data Output - Basin C(Rhoton Road)
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C
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8:11:23 am
YELM PW YARD
Q100 YR STORM LEVEL POOL ANALYSIS
BASIN. C - OFFSITE ROADWAY FRONTAGE
c
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page
1
---------------------------------------------------------------------
--------.-------------------------------------------------------------
BASIN ID: CPT_lOa
SCS METHODOLOGY
TOTAL AREA. ..,
~_INFALL TyPE....:
PRECIPITATION....:
TIME INTERVAL ...:
rr
U
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c
c
c
ABSTRACTION COEFF:
TcReach - Sheet
TcReach - Shallow
TcReach - Channel
PEAK RATE' 0.36
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BASIN SUMMARY
NAME: Q100 YR STORM EVENT
0.47 Acres
TYPE1A
4 00 inches
10.00 min
BASEFLOWS:
0.00 cfs
PERV
0.19 Acres
86.00
5.00 min
AREA. . :
CN.... :
TC.... :
0.20
L: 65 00 ns:0.1500 p2yr: 2.00
L:~cr(J:ua-R s : 27 . 0 0 s: 0 . 0 15 0
L: 275.00 kc'17.00 s:0.0200
cfs VOL: 0.12 Ac-ft TIME'
s.0.0400
500 min
IMP
0.28 Acres
98 00
5 00 min
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8:11:23 am
page
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YELM PW YARD
Q100 YR STORM LEVEL POOL ANALYSIS
BASIN C - OFFSITE ROADWAY FRONTAGE
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=====================================================================
STAGE STORAGE TABLE
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CUSTOM STORAGE ID No. STO_c
Description. INFILTRATION TRENCH BASIN C
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STAGE (----STORAGE----) STAGE (----STORAGE----) STAGE (----STORAGE----) STAGE (----STORAGE---->
(ftl ---cf--- --Ac-Ft- (ftl ---cf--- --Ac-Ft- (ftl ---cf--- --Ac-Ft- (ftl ---cf--- --Ac-Ft-
321 00 o 0000 o 0000 322 10 191 77 0.0044 323.20 383 53 o 0088 324 30 1866 o 0428
321 10 17 433 o 0004 322 20 209 20 0.0048 323 30 400.97 o 0092 324 40 2314 o 0531
321 20 34.867 o 0008 322 30 226 63 o 0052 323 40 418 40 o 0096 324 50 2762 o 0634
321 30 52.300 o 0012 322 40 244 07 o 0056 323 50 435 83 o 0100 324 60 3209 o 0737
321 40 69 733 o 0016 322.50 261 50 o 0060 323 60 4.53 27 o 0104 324 70 3657 o 0840
321 50 87 T67 0.0020 322.60 278 93 o 0064 323 70 470 70 o 0108 324 80 4105 o 0942
321 60 104.60 o 0024 322.70 296 37 o 0068 323 80 488.13 o 0112 324 90 4552 o 1045
321 70 122.03 o 0028 322 80 313 80 o 0072 323 90 505 57 o 0116 325 00 5000 o 1148
321 80 139.47 o 0032 322 90 331 23 o 0076 324 00 523 00 0.0120
321 90 156 90 o 0036 323 00 348.67 o 0080 324 10 970 70 o 0223
322 00 174 33 0.0040 323 10 366 10 o 0084 324 20 1418 o 0326
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YELM PW YARD
Q100 YR STORM LEVEL POOL ANALYSIS
BASIN C - OFFSITE ROADWAY FRONTAGE
II
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---------------------------------------------------------------------
---------------------------------------------------------------------
STAGE DISCHARGE TABLE
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DISCHARGE LIST ID No. DIS 13C
Description: 13"/HR INFILTRATION RATE
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STAGE (--OI SCHARGE-n) STAGE (--OISCHARGE---) STAGE (--OISCHARGE---) STAGE (--OISCHARGE---)
( ft) ---cfs-- ------- ( ft) ---cfs-- ------- ( ft) ---cfs-- ------- ( ft) ---cfs-- -------
321 00 o 1400 322 10 o 1400 323 20 o 1400 324 30 o 1400
321 10 o 1400 322 20 o 1400 323 30 o 1400 324 40 o 1400
321 20 o 1400 322 30 o 1400 323 40 0.1400 324 50 o 1400
321 30 o 1400 322 40 o 1400 323.50 o 1400 324 60 o 1400
321 40 o 1400 322 50 o 1400 323.60 o 1400 324 70 o 1400
321 50 o 1400 322.60 o 1400 323 70 o 1400 324 80 o 1400
321 60 o 1400 322 70 o 1400 323 80 o 1400 324 90 o 1400
321 70 o 1400 322 80 o 1400 323 90 o 1400 325 00 o 1400
321 80 o 1400 322 90 o 1400 324 00 o 1400
321 90 o 1400 323 00 o 1400 324 10 o 1400
322 00 0.1400 323 10 o 1400 324 20 o 1400
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YELM PW YARD
Q100 YR STORM LEVEL POOL ANALYSIS
BASIN C - OFFSITE ROADWAY FRONTAGE
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LEVEL POOL TABLE SUMMARY
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MATCH INFL~ -STO- -DIS- (-PEAK-) STORAGE
(--------DESCRIPTION---------) lcfs) lcfs) --id- --id- (-STAGE) id VOL lcf)
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a100 YR STORM
o 00 0 36 STO_c DIS_13C 323 81 2 490.02 cf
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City of Yelm
105 Yelm Avenue West
POBox 479
Yelm, Washington 98597
(360) 458-3244
Date
To
From
cc:
Re
July 20. 1998
Tim Peterson_,.PYV Supervisor
Cathie Carls~City Planner
Shelly Badger. Ken Garman. Stephanie Conners, Gibran Hashmi, Dana Spivey
Site Plan Jor Public Works Yard
The Site Plan Review Committee has reviewed the conceptual layout for the Public Works Yard located
o\,,! the west side of Rhoton Road. As you finalize your .site plan, the committee had the following
comments:
1 The ratio for parking is 1 space per employee, plus 1 space per City vehicle, plus 1 space for every 350
sq ft of office space
2. A Refuse Container Storage Area is required for the site. Please refer to the City Development
Guidelines, DWG. NoR-~and R-2 (attached) for specific standards on construction and landscaping
3 The security lightin the Police Vehicle Impound Yard should be located inside the yard and positioned
so that no glare effects adjacent properties You may need to relocate the yard to accomplish this.
4 The landscape buffer along the western property line needs to be 15' in width and landscaped with
Type I landscaping to ensure a dense screen. The buffer can be constructed in Phases which correspond
with the development of the site Phase I, as depicted on the conceptual site plan would require the
landscape buffer to end approximately 50 feet beyond the site improves. The exact location should be
determined in the field as construction is occurring The objective is to extend the buffer to a location that
will screen the view for adjacent property owners
p The landscape buffer along the northern property line needs to be 8' in width and landscaped with a
Type II landscaping and a Type V landsCaping around and in the stormwater facilities. The existing
vegetation, in particular, between the building site and the stormwaterfacilitiescan be used as a credit for
a part of the buffer and stormwater facility landscaping requirements In the future if any of the vegetation
is removed for further site development the buffer and the stormwater facility will need to be augmented to
compensate for the removal of vegetation
6 The conceptual landscape must be illustrated either on the site plan or a separate sheet. A final
landscape plan is not required until final civil plans are submitted
7 Half street improvements (Commercial Collector) along Rhoton Road are required The City will allow
for a deferral of improvements with the execution ofa Waiver of Protest.
8 As a reminder, the approval process for a government facility requires a Special Use permit. A special
use is approved by the City Council following a public hearing and a recommendation by the Planning
Commission The application process for a special use is approximately 65-90 days~
If you have any questions please contact me at 458-8408.
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