20130323 Peer Rev Ltr 09242013 ENGINEERiNG.PLANNING,ENVIRONMENTAL SCIENCES
1019 39th Avenue SE,Suite 100
Puyallup,WA 98374
T.253.604.6600 E 253.604.6799
www.parartietrix.com
September 24,2013
PMX No. 216-1781-031 Ph 09
Ms. Karen Bennett
City of Yelm
105 Yelm Avenue West
Yelm,WA 98597
Re: Prairie Park Stormwater Review
Dear Karen:
We have finished our review of the Prairie Park Stormwater Renovations plan set,as requested on Tuesday,
September 17, 2013. Below are our review comments:
Comment Sheet/Page Reviewer's Comment
No.
1. GN-01 Please revise note 9.A under SJC Alliance General Erosion Control Notes
to read "No more than 100 feet" per City of Yelm Development
Guidelines Section, 6.160.D
2. DT-01,SD Please provide a Construction Entrance Detail (per City of Yelm Civil Plan
Sheets Checklist), and show where construction entrances will be located on the
plans.
3. SD Sheets Please provide existing topography, as well as spot elevations of
proposed grading plan at each site to ensure adequate drainage.
4. SD Sheets The same linetype is used for different features in the base map, making
it difficult to determine existing conditions. Please revise base map for
clarity,and add existing features to Legend.
5. SD Sheets Please check all pipe length labels.According to Note 5 under SJC
Alliance Storm Drainage Notes, pipe lengths are called out from center
of structure to center of structure.This does not appear to be consistent
in the plans.
6. SD Sheets Please revise structure labels to include SD pipe invert, diameter, and
direction.
7. SD Sheets Please add/revise callouts to more clearly explain which SD pipes and
structures are to remain, and those that are to be plugged.
8. SD Sheets Please revise infiltration gallery detail so that filter fabric is wrapped
around all sides of gallery.
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Ms. Karen Bennett
September 24,2013
Page 2
9. SD Sheets Please revise infiltration gallery detail so that the space between the top
of the filter fabric and the finished grade refer to the provided
restoration detail.
10. SD-01 Please revise Trench Restoration detail so that cement conc. pavement
layer is in accordance with City of Yelm Standard Detail 4-10,Trench-
Pavement Restoration Detail.
11. SD-02 and Please revise Pavement Restoration detail so that Class B ACP layer is in
SD-03 accordance with City of Yelm Standard Detail 4-10,Trench-Pavement
Restoration Detail.
12. Drainage Stormwater Treatment was not addresses in the 1992 DOE Manual in a
Report manner that is consistent with current State of Washington standards.
The computations should be revised to follow the 2012 Stormwater
Management Manual for Western Washington as prepared by
Department of Ecology.
13. Plans/Drainage A Tributary Area Map should be provided depicting both the entire
Report drainage area that is being removed from the Prairie Park Development.
14. Plans/Drainage Existing pre-development contours of the Prairie Park development
Report should be provided as assurance that the bottom elevation of each
infiltration gallery is below any fill that could have been placed during
construction.
15. Drainage Rationale for the statement"The proposed infiltration trenches will not
Report p.4 contain perforated pipe" should be provided.
If you have any question please feel free to contact me at our office at 253-604-6600.
Sincerely,
PARAMETRIX
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Brian Bunker, PE
Project Manager
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