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(2) The customer may choose a higher level of protection than required by the <br />agency. The minimum types of backflow protection required to protect the approved <br />water supply at the customer's water connection to premises, with varying degrees of <br />hazard, are provided in Table 1 below. Situations which are not covered in Table 1 shall <br />be evaluated on a case-by-case basis, and the appropriate backflow protection shall be <br />determined by the agency. <br />(3) In those instances where conditions warrant, the agency may modify the <br />minimum installation herein indicated as appropriate to provide a degree of protection <br />commensurate with the degree of hazard. <br />TABLE 1. TYPE OF BACKFLOW PROTECTION REQUIRED <br />_1 <br />Degree of Hazard <br />Aircraft and missile plants <br />Automotive plants <br />Auxiliary water systems (interconnected) <br />Auxiliary water systems (not interconnected) <br />Minimum <br />Type <br />of Backflow <br />Protection <br />RP <br />RP <br />RP <br />RP <br />9. <br />Buildings with 2 or more service connections (interconnected) <br />DC 1 <br />10J <br />Buildings with house pumps and/or potable water storage tank <br />DC <br />11..I <br />Buildings with wastewater pumping and/or treatment plants (not <br />RP !, <br />_ interconnected) <br />12.I <br />Canneries <br />RP <br />13.1 <br />Car wash facilities <br />RP <br />14.1 <br />Centralized heating and air conditioning plants <br />RP j <br />15.1 <br />Chemical plants <br />j RP <br />16 <br />Chemically treated potable water systems <br />RP <br />17. !; <br />Civil works (facilities not subject to city plumbing inspection) <br />- <br />RP <br />Ordinance No. NS -2921 <br />Page 27 of 57 <br />