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9. Flooding. <br />a. Prior to the recordation of a Final Map, a Conditional Letter of Map Revision <br />(CLOMR) that indicates how the Staples Ranch Site will be removed from the <br />floodplain shall be filed and approved by the Federal Emergency <br />Management Agency (FEMA), and a copy of the approved CLOMR shall be <br />provided to the City Engineer. No building permits shall be issued for <br />development within the Staples Ranch Site until a Final Letter of Map <br />Revision (FLOMR) has been filed and approved by FEMA, unless it can be <br />demonstrated to the satisfaction of the City Engineer that construction of the <br />Livermore Flood Protection improvements described in the EIR will be <br />completed prior to occupancy of any buildings on the Staples Ranch Site. <br />b. Prior to beginning any construction activities, hydraulic modeling for the actual <br />Stoneridge Drive bridge designs shall be complete and demonstrate that <br />channel flow rates, capacity, and velocities in the Arroyo Mocho are not <br />negatively impacted and scour protection is adequately addressed. The <br />hydraulic modeling shall be subject to the review and approval of the City <br />Engineer. The ACSPA shall be responsible,for the hydraulic modeling. <br />10 Water and Sewer Utilities. <br />a. The public water line main shall be a minimum of 12 inches in diameter <br />unless otherwise approved by the City Engineer. <br />b. The public sanitary line main shall be a minimum of 8 inches in diameter <br />unless otherwise approved by the City Engineer. <br />c. All water and sewer lines must be separated by a minimum of 10 feet unless <br />otherwise approved by the City Engineer. <br />d. The Project Developer shall attempt to achieve a public sanitary sewer pipe <br />slope of 0.005 (0.5%) with a velocity of 2.0% per second. A slope of 0.003 <br />(0.3%) is acceptable, if necessary to meet site conditions. <br />e. The Project Developer shall attempt to achieve a gutter slope of 0.75%. <br />f. The Lease Area shall have a separate water meter. <br />g. With the exception of the public water and sewer lines, all water and sewer <br />lines on site shall be private laterals. The laterals shall tie into the public <br />water and sewer lines. <br />h. All private sewer and water laterals shall be marked "private". The location of <br />the markings shall be subject to the review and approval of the City Engineer <br />prior to the issuance of a building permit. <br />i. All water service laterals shall be equipped with backflow prevention devices, <br />unless waived by the City Engineer. The type of back flow prevention device <br />14 <br />