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0 LY M P 1 C Olympia,WA 98508
360.705.2474
ENGINEERING 360.705.2443fax
January 7, 2015
Karen Benett
City of Yelm Community Development Department
105 Yelm Ave. W.
Yelm, WA 98597
Re: Yelm Physical Therapy
Reply to lst Review Comments
OE No. 14009
Dear Ms. Bennett:
This tetter is in response to your letter dated December 18, 2014 along with the comment letter
from SC] Alliance, dated December 15, 2014. Attached for the city's further review are three
full-size revised pians sets along with two copies of the drainage report. We have addressed the
review comments in the order received as follows:
Sheet C 1.1
1. A note has been added to Sheet C2.1 requiring the existing 4"AC water line to be capped at
both ends and for thrust blocking to be instailed.
Sheet C1.2
1. A concrete collar has been added around the inspection port.
2. The Baysaver vault rim elevations in the detail on Sheet C1.6 have been revised to match the
elevations on Sheet C1.2.
Sheet C1.3
1. The existing Solberg pavement section has not been verified. Since the new required
pavement depth is 4", Construction Note #14 on Sheet C1.1 was revised to require removal
(not grinding) of the existing asphait and existing road section as needed to accommodate the
new 4" asphalt depth. Construction Note #10 on Sheet C1.3 was revised eliminating the
reference to a 2"overiay and the Solberg St. Section A-A detail on Sheet C1.7 was revised to
reflect a 4"pavement depth for the entire half-street.
2. It is our understanding that the alley will be one-way with vehicles entering the alley from the
west and exiting to the east onto Rice St. If this is correct, there would be no right-turn
movement that would affect the ADA ramp.
3. A note was added to Construction Note #9 on Sheet C2.1 requiring a minimum 42"cover over
the water pipe and a minimum 6" sand cushion between the water and storm pipes where
they cross.
Sheet C1.7
1. The Modified Commercial Collector detail for Solberg St. was provided by Ryan )ohnstone,
Public Works Director.
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Ms. Bennett
1/7/15
Page 2
2. The Solberg St. Section A-A detail was revised to show a 4"depth of asphalt.
Sheet C2.1
1. The STEP service line was moved outside of the refuse pad.
2. A note was added to Construction Note #il stating that the pumping system is required to be
an intrinsically safe duplex system.
3. Construction Note #11 was revised recommending the control panel not be placed on the
building.
4. A note was added to Construction Note #11 requiring a transfer switch and plug for a backup
generator.
5. The STEP tank invert elevation was revised to provide a maximum distance of 5' between the
rim and invert.
6. A STEP tank sizing report is enclosed. The proposed STEP tank size is based on water usage
records from the existing Yelm Physical Therapy o�ce.
7. A note was added to Construction Note #6 requiring two bollards be placed in front of the
meter boxes. A bollard detail was added to Sheet C2.4.
8. The water and sewer details on the city's website are poor quality scanned images and do not
reproduce well; therefore, AutoCAD details were utilized. The AutoCAD detaiis were provided
by the city several years ago and are exactiy the same as the PDF version minus the Public
Works Director's signature.
9. The STEP service line size was changed to 2" diam. and the sewer gravity service was
changed to 6"diam.
10. An RPBA symbol was added behind the domestic water meter.
11. A STEP service box symbol was added.
General Comments on Plans
1. See response #8 above regarding the city details.
2. The Post Construction Soil Quality and Depth requirements were added to Sheet C1.2.
Stormwater Pollution Prevention Plan
1. The reference to Grays Harbor County has been revised to Thurston County.
2. A Drainage Basin Map has been added to the Appendix.
.
Ms. Bennett
1/7/15
Page 3
Review of the Site Plan Review Committee's Conditions of Approval, dated September
9, 2014
1. A STEP tank sizing repo�t is enclosed. The proposed STEP tank size is based on water usage
records from the existing Yelm Physical Therapy office.
2. An estimate of water usage is included in the enclosed STEP tank sizing report. Based on the
water usage records from the existing Yelm Physical Therapy ofFice, the proposed building will
be 1 ERU.
3. It is our understanding that the existing hydrant located at the intersection of Yelm Ave. and
Soiberg St. will provide for sufficient fire protection.
4. Intercity Transit requires a 10.5'wide by 3.5'deep bus stop pad for a shelter located behind a
sidewalk and when the distance between the curb and back of shelt�r pad is at least 8'.
5. The landscape plans have been revised based on the redline comments.
If you have any questions ar additional comments, please call me at (360) 705-2474 or e-mail me at
chris@olyeng.com. Thank you.
Sincerely,
Olympic Engineering
�-V �--�,
Chris Merritt, PE
Principal Engineer
encl: STEP Tank Sizing Report
(3) Civil and Landscape Plans
(2) Drainage Reports
Original Red-Lined Plan 5ets and Drainage Report
CD with Civil and Landscape Plans and Drainage Report
cc: Sean Sipe
G:1File Cabinet�Business\Olympic�Projects\2�J14\14009-Inspire Physical TherapylBennett Response Letter 010714.docx
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Sewer STEP Tank Sizing & Water Usage Calculations
Project: Yelm Physical Therapy
O E#: 14009
Date: January 5, 2015
Useage/Flows
Ex.Yelm Physical Therapy Office
525 cf/month average per city records
1,660 sf building size per county records
= 0.32 cf/sf/month average
Proposed Yelm Physical Therapy Office
2,726 sf building
0.32 cf/sf/month average
= 862 cf/month
= 1 ERU (1 ERU =875 cf/month)
= 6,449 gal/month
Q= 297 gpd(based on 21.74 work days per month)
STEP Tank Volume
-per Washington State DOE Criteria for Sewage Works Design and City of Yelm
Development Guidelines
Detention Volume
V=2.OQ where, V= Liquid Volume
Q= Peak Day Flow
V= 593 gal
Working Volume
The proposed 20 gpm pump can pump substantially more than the peak
inflow;therefore, use volume between "ON" and "OFF" switch (4.5"
drawdown per City).
Based on 1,500 gallon tank by Evergreen Pre-Cast,the volume between
pump "ON" and "OFF" is±20.3 gal
Storage Volume
297 gal(24 hour volume)
Min.Tank Volume= 910 gal
Use 1,500 gallon tank