Transmittal LetterjWM&A
Jeroane W.1VIorrissette & Associates Inc... P. S.
1700 Cooper Point Road SW, #B-2, Olympia, WA. 98502-1110
(360) 352-9456 • (360) 352-9990
LETTER O~ TRp-NS~IIITTAL
T®: Steve Harrington ,
pevelopment Services Civil Inspector
City of Yelm
105 Yelm Avenue W.
Yeim, WA 98597
J®B N®. 05141
DATE: July 20, 2007
S~JECT: TwinStar (Twin County Credit Union)
Re-submittal Site Construction. Plans
I am enclosing for you the attached items:
/~~
`J
- -OS-0498-YL
RECEIVE
JUL 2 3 Zi~07"
COPIES DATE DESCRIPTION
4 July, 2007 Revised Civil Construction Plans
2 July, 2007 Drainage Report
1 October, 2006 Redlined Plans
1 July, 2007 STEP Tank Sizing Calculations
Attached are the revised copies of the Revised Civil onstruchon Plans addressing your June 14,
2007 comment letter. I have provided responses to~ u`rco ents.
Storan Drainage I2e~ort
1. Section 9 was corrected to match Appendix B areas.
2. Added in Section 1 -Sequence to install the erosion control elements.
3. I was not able to find a math error. I believe the line listing the Existing.
Impervious to New Building with 1410 sf was confusing the calculation. This is
not new impervious and was not included in calculation for Total New Building
Impervious. The sheets were revised to clarify the calculations of existing
impervious to new building impervious, which does not increase the new
impervious area.
4. The information referenced was a portion of the Howard Godat original plan for
the site, indicating the gallery size.and clarified the reference.
5. The 457 cf comes from the HYDRA model. I have added clarify language in
Appendix B and have included cover sheets for the Hydra Command, Report and
Output files for the Basins 100 year and 6 month models.
6.. I was'not able to find an error. The sheets were revised to clarify the calculations.
I have added clarifying language in Appendix B and have included cover sheets
Civil • Municipal • Geotechnical Engineering and Planning
~. for the Hydra Command, Report and Output files for the Basins 100 year and 6
month models.
7. Pond bottom was erroneously taken from the original report. The pond bottom
was revised and calculations revised..
8. Pond bottom corrected and calculations revised.
9. The comparison of the wetpond volumes was revised.
d~ ~ 10. Page 5 was corrected to provide calculations of wetpond pond outfall maximum
flow.
~ v, .4-Y. The report was clarified to include cover sheets for all Hydra files and
clarification on the calculation sheet to help locate these files.
~3. FYI have included copies of the maintenance plan submitted with the original
stormwater report in Appendix G and a draft plan in Appendix C if required.
Construction Plans
AlI Sheets ,
13. Redlines corrected.
Sheet 1 of 4
14. Hearings Examiner Conditions of Approval was added on sheet C 1.0.
15. A layout plan sheet C4.0 was added.
16. There is an existing refuse collection area on the south side of the existing
building and has been identified on the Cover/Site Plan sheet C 1.0.
17. Existing runoff currently collects at the appropriate center line of the roadway.
The grades have been revised so the runoff collects in the same locations.
18. The grades were revised in this area. .
19. Invert information has been added to the Storm and Grading Plan.
20. The roof drainage collection grades are shown to be a minimum of 1 %.
Sheet 2 of 4
21. Well has been decommissioned, note removed.
22. Silt fence extended.
Sheet 4 of 4
23. The sidewalk is out of the right of way and private, the preference is to utilize the
detail provided.
If you have any questions, please contact me at (360) 352-9456.
Very truly yours;
Jerome 1A/. ~lorrissette & Associates Inc., P.S.
SIGNED:
Robert Tauscher, P.E.
C: Fred Lawson, EHS Design, 600 University St, Ste 1818, Seattle, WA 98101
C:\Bob\05132 Twinstar\Correspondence\062907 Transmit Yelm Resubmit.doc
Civil . Municipal ® Geotechnical Engineering and Planning