20070404 COY 2nd Rev Ltr 02242009"711() to
Community Development Department
105 Yehn Avenue West
P.O. Box 479
YeIrn, WA 98597
February 24, 2009
Sound Engineering, Inc.
1102 Commerce Street, Suite 300
Tacoma, WA 98402
RE: Creek Road Mixed Use — SPR.07.0404 -YL
Review No. 2 of Civil Construction Documents
Mr. Haug,
The City of Yelm has completed the first review of the civil plans for Creek Road Mixed
Use. Your application included:
• Construction Documents
• Storm Drainage Report
• Landscape Plans
• STEP Report
• Operations & Maintenance Manual
• SWPPP
We have reviewed the plans for compliance with the City of Yelm Development
Guidelines, the DOE Stormwater Manual and general standards of civil engineering
practice. The following comments need to be addressed before the plans may be
approved for construction. Our comments are summarized below:
Water Comments:
1. All DOMESTIC water services are required to have REDUCE PRESSURE
BACKFLOW ASSEMBLY behind them. This also is required on three story
buildings or apartments, The recreational building with the pool is required to
have a REDUCED PRESSURE BACKFLOW ASSEMBLY on it too.
2. A copy of the well removable report will need to be sent to the water
department.
3. Will need to pay for the fire hydrant locks.
(360) 453 -8438
(360) 458 -3144 FAX
wwwxi.yelm.wn,us
4. Item # 6 from review # 1. There are still some waterlines that are over 42" deep
please check with water dept.
5. A water easement still needs to be done for the watermain connection off 106tH
Sewer Review:
Sewer Utility portion of the Submittal has substantially changed since the last
submittal #1. Total occupancy numbers used to calculate tank sizes dropped
49% from first submittal. In paragraph 2.2 of the STEP System report, revised
December 2008, the first sentence states "Below is a breakdown of the units,
the number of bedrooms and bathrooms, assumed occupancy, and
totals." The embedded chart below that makes no reference to bathrooms and
does not agree with the chart shown on exhibit A -3. The chart on exhibit A -3
shows occupancies as follows:
Unit Bed Bath Assumed ®cc.
A 2
1
2
B 2
1
3.5
C 2
2
4.5
D 3
2
5.5
The Chart in paragraph 2.2 shows occupancies as follows:
By information the information the Engineer has provided, the total
occupancy for the complex varies by numbers used from 332 to 652.
This difference will substantially affect tank sizing for the project. It is the
position of the Yelm Sewer Department that the higher numbers need to be
used in tank sizing calculations.
Please see The Washington Dept. of Health Book "Design Standards for
Large ®n -Site Sewage Systems" spells out design standards and occupancies
that the Yelm Sewer Department will accept for the multi - family dwellings. The
publication is available at: http:// vvNi/vv.doh.wa.gov /eho /ts/WVV /L oss /i osa :R5 gd .
Specifically see page 16.
February 24, 2009 Page 2 of 7
Totals
Unit
#
Bed
®cc.
Beds
People
A
32
1
1
32
32
B
42
2
2
84
84
C
54
2
2
108
108
D
36
3
3
108
108
By information the information the Engineer has provided, the total
occupancy for the complex varies by numbers used from 332 to 652.
This difference will substantially affect tank sizing for the project. It is the
position of the Yelm Sewer Department that the higher numbers need to be
used in tank sizing calculations.
Please see The Washington Dept. of Health Book "Design Standards for
Large ®n -Site Sewage Systems" spells out design standards and occupancies
that the Yelm Sewer Department will accept for the multi - family dwellings. The
publication is available at: http:// vvNi/vv.doh.wa.gov /eho /ts/WVV /L oss /i osa :R5 gd .
Specifically see page 16.
February 24, 2009 Page 2 of 7
The extremely large size of the tanks provided will make it very difficult when it
comes time to maintain and pump the tanks. The typical Septic Pumping Truck
can hold approximately 3700 gallons of septage. This means that it takes two
trucks to pump a 6000 gallon tank. A 10,000 gallon tank would take two trucks
and a trailer to accomplish the task. Another consideration is the time it takes to
pump a tank. As the tanks get larger, it takes longer to pump the tank and run in
during pumping becomes a consideration requiring us to pump more water in
order to get the solids which increases maintenance expenses. The sewer
department would like to see the tank size held to a maximum tank size of 6000
gallons if possible. We would entertain the idea of using septic holding tanks
gravity flowing into pump tanks.
8. It needs to be decided how much of the commercial buildings will be used for
restaurants. Again, the amount of space used for restaurant space has been
dropped. This once again affects the calculations used to size step tanks. This
seems to be a trend.
9. It is not acceptable to flush the pool filter into STEP tank E. This would wash all
of the solids out of the tank into the biofilter and create a maintenance
nightmare, The addition of 2000 gallons of Chlorinated Pool Water to the tank
would affect the biological activity in the tank, also.
10. Paragraph 4.2 of the STEP System Report should be titled "Service Lines ". All
references to "Pressure Side Sewers" should be changed to "Service lines ".
1 1. Paragraph 5.0 of the STEP System Report refers to designing the Grease
interceptors at a later date. The sewer department questions this idea. How will
grease laden side sewers be installed after the building has been built?
12. Step tank lids and Carson boxes (for Service Line Valves) are not to be located
in vvalkways due to trip hazard.
13. Step Tank note on bottom right of page C27 is unacceptable. Engineer will
provide tank specific tank and pump details according to Yelm specifications
prior to plan approval.
14. It is suggested to upsize the 3" line to 4" due to the fact that 3" fittings are
special order and harder to access?
15. Step tank pumping Systems should be duplex rather than Triplex systems.
16. Sta. 50 +71.16 shows step main to be 10' below finished grade. This is
unacceptable.
17. Sta. 51 +45 will need ARV. This is located on Access Way "A"
Feb. aZFY24, 2009 Page 3 of 7
Lights:
41. Is there any lighting for this project? If so, please include on plans including
stationing with offsets to fixtures, pole type and manufacturer, mounting height,
arm length, pattern, power source, wire size, type conduit along with wiring
schematic, "J" boxes.
42. Please include construction notes for lighting
43. Please include a lighting detail sheet.
44. There still needs to be a complete lighting plan submittal before the plans will
be approved for construction.
Miscellaneous:
45. There are new Red Lines on plan sheets.
46. There is an existing fuel tank behind house that will need to be abandoned and
check for leakage or contaminants in soil around fuel tank
47. Fuel tank and septic tanks not show or located, must be abandoned per D.O.E.
requirements.
48. The plans call out two sheds behind the existing house on site. Is one of the
sheds a well pump house? This will need to be verified.
49. Please include all Easements and or Dedication Deeds.
50. All easements should be shown on plans.
51.All parking lot pedestrian pathways are required to be constructed of concrete
cement material to differentiate from the asphalt parking and drive lanes.
Concrete stamped patterns must be approved by the City of Yelm.
February 24, 2009 Page 6 of 7
Please review and revise the plans to address the above referenced comments. When
the project is resubmitted you will need to submit .4 sets of plans and 2 sets of reports,
plus send back original red lines. The project engineer should include a written
response with the re- submittal, indicating how all the review comments above have
been addressed or responded to. This will significantly expedite our review of the
project. If you have any additional questions or comments please do not hesitate to
call or contact me at steveh @ci.yelm.wa.us.
Community Development Department
Respectfully,
Steve Harrington
Civil Engineering Inspector
February 24, 2009 Page 7 of 7