Resolutions-1997-021

9.09 PROTECTION OF WATER SUPPLIES A. There shall be no physical connection between a public or private potable water supply system and a sewer appurtenance, which would permit the passage of any sewage or polluted water in the potable supply. B. Under normal conditions, water mains parallel to sewers shall be placed at least 10 feet horizontally from any sanitary sewer, storm sewer or manhole. Where local conditions prevent this separation, the water main may be laid closer provided the bottom of the water main is at least 18 inches above the top of the sewer and the water main is placed in a separate trench or in the same trench on a bench of undisturbed earth at a minimum horizontal separation of 3 feet from the sewer. C. Water mains crossing sewer services, storm sewers or sanitary sewers shall be laid to provide a separation of at least 18 inches between the bottom of the water main and the top of the sewer. Where local conditions prevent this vertical separation the water main shall not be placed closer than 6 inches above a sewer or 18 inches below a sewer under any circumstances. Additionally, one full length of water pipe crossing the sewer shall be centered at the point of crossing so that the water pipe joints will be equal distance as far as possible from the sewer. The water and sewer pipes must be adequately supported and have pressure tight joints. A low permeability soil shall be used for backfill material within 10 feet of the point of crossing. D. No water pipe shall pass through or come in contact with any part of a sewer manhole. A minimum horizontal separation of 3 feet shall be maintained. 9.10 MINIMUM COVER AND BACKFILL AND BEDDING A. The minimum cover for storm sewers shall be 1 foot below the bottom of pavements and 2 foot below the surface or non-paved areas. All shallow pipe shall be designed to withstand anticipated live loads. B. Within public right-of-way, backfill shall consist of crushed stone placed in one foot lifts and compacted to 90% Modified Proctor Density or suitable job excavated material placed in one foot lifts and compacted to 90% Modified Proctor Density. If crushed stone is used, the top 12 inches of backfill shall consist of suitable job excavated materials. Flowable mortar may be used upon approval of mix design by the City. Sand backfill is not permitted. C. All other areas – backfill shall consist of suitable job excavated material placed in one foot lifts and compacted to 85% Modified Proctor Density. 9.11 PERFORMANCE & TESTING A. All sewers and manholes will be lamed and visually checked prior to acceptance. B. All tests will be completed after backfill is complete. C. All flexible pipe 12 inches in diameter and larger shall have a deflection test conducted after the final backfill has been in place for at least 30 days. No pipe shall exceed a deflection of 5%. The deflection test is to be run using a