R-2004-03 adopt portion of “PICM" relating to water system design criteria and improvements

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. e Table 3.4 PROTECTION REQUIREMENTS AT WATER LINE - FORCE MAIN CROSSINGS PROPOSED WATER PRIMARY PROPOSED WATER PROPOSED FORCE MAIN CONDITION EXISTING FORCE MAIN OR EXISTING WATER PROPOSED FORCE MAIN SECONDARY WATER OVER WATER UNDER WATER OVER WATER UNDER CONDITIONS FORCE MAIN FORCE MAIN FORCE MAIN FORCE MAIN Less Greater Less Greater Less Greater Less Greater IF THE than 2' than 2' than 2' than 2' than 2' than 2' than 2' than 2' CLEARANCE IS but less but less but less but less than 10' than 10' than 10' than 10' *Protection 1 2 3 4a or 4b 5 6a 3 6a & 6b Reauirement J *PROTECTION REOUlREMENTS FOR FORCE MAIN CROSSINGS (All clearances shall be measured from outside wall to outside wall) J. Construct waterline with a 20-loot ductile iron section with all related appurtenances centered above theforce main; 6-inch minimum clearance. Construct water line with one 20footjoint ofC-90b, C-905 PVC centered above theforce main. Not allowed. a. Auger, bore &jack or microtunnell0feet minimum each side offorce main. Place one 10-loot joint of C-900 or C905. 150 psi, centered under sanitary sewer. Fill bore hole with bentonite/clay mixture or grout; 2 foot minimum clearance. b. OR replace the existingforce main with 150 psi lined ductile iron pipe with appropriate adapters on all portions of the force main within J 0 feet of the water line. Center a minimum 18 foot joint of force main, 150 psi lined ductile iron pipe under water line and use cement-stabilized sand backfill for all portions of the sanitary sewer force main with 10 feet of the water line as measured perpendicularly from any point on the water pipe to the sanitary sewer force main pipe (minimum 2.5 sacks cement per cubic yard of sand). The cement-stabilized sand bedding shall be from a point 6 inches below the bottom of the sanitary sewer force main to 6 inches above the top of the sanitary sewer force main and one quarter of the pipe diameter of the sanitary sewer force main on either side of the sanitary sewer force main. Minimum 18 foot of sanitary sewer force main, 150 psi lined ductile iron pipe centered at the water line. 2. 3. 4. 5. 6. 3.03 QUALITY ASSURANCE A. Prepare calculations and drawings prepared under the supervision of a Texas Professional Engineer trained and licensed under the disciplines required by the nature of the drawings. The final design drawings, must be sealed, signed and dated by the Professional Engineer responsible for development of the drawings. B. For Elevated Stream and Ditch Crossings: .Prepare design calculations for support columns and column spacing. 3.04 EXTRA TERRITORIAL JURISDICTION The criteria herein described in this chapter shall be applicable to all water main and appurtenance construction and all devices thereunto related within the ETJ of the City of La Porte except where specifically denied or where specific exemptions for the ETJ have been enumerated. January 2004 Water System Design Criteria Page 13 of 13