07-0135 Sewer #3 100308
CITY OF YELM SEWER DEPARTMENT
Oct. 2, 2008
Re: Review #3 SPR-07-0135-YL Today’s Dental
Sheet # 11.01 “Phase 1& 2 demolition plan” Note #17 Denotes existing STEP to be decommissioned …Sheet # 31.01 Phase 3 Demolition Plan Note #7 denotes Protecting existing Septic Tank
and Sanitary Pipe.
What actually is going to happen and when?
It appears that the new tank is going to be installed, the neighboring business hooked up to the new tank and the old tank decommissioned and abandoned. Is this assumption correct?
Existing STEP tank must remain fully functional until such time as the new STEP tank is fully functional and ready to receive wastewater.
The existing STEP Tank at Today’s Dental is NOT H-20 load bearing rated and must be protected from being driven over or parked on, prior to being decommissioned.
Sheet c14.01 Utility Note #6 calls out for sewer lines to be SDR35 unless otherwise specified…Side Sewer labels call out sched. 40 pvc. Side Sewers need to be SDR35 and Pump service
lines need to be Schedule 40 PVC.
Submittals must be received and approved by the City of Yelm Sewer Dept. for the new tank.
Depth of bury for the new tank must be 5 feet or less from the invert elevation of the inlet to the rim elevation of the highest rim.
Sheet C14.01 Sheet note 11 discusses connecting proposed sewer line to existing Grease interceptor outlet line…The neighboring business also has a side sewer not served by the grease
trap. All lines feeding to the existing STEP tank must be served by the new step tank.
Existing 2” sewer pressure line is a pressure main. It is to be left intact along with the end of line clean-out in the proximity of the existing STEP tank.
Sheet C14.01 sheet note 12 calls for providing a 2” check valve assembly on the existing sewer pressure line. This is not needed nor desired please leave existing sewer pressure main
alone with the exception of tapping for the service line for the new tank.
Sheet C14.01 sheet note #6 The Sewer Department does not understand the requirement that the service line run uphill to the main. We have not seen that requirement before.
Please move pump control panel to closer proximity to the tank, near the Hose Bib would be ideal.