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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 />Minimum <br />Degree of Hazard <br />Type <br />of Backflow <br />Protection <br />1. <br />Aircraft and missile plants <br />RP <br />2. <br />- _ .... _._... -- . <br />Automotive plants <br />--- <br />RP <br />3. <br />Auxiliary water systems (interconnected) <br />RP <br />4. <br />` <br />Auxiliary water systems (not interconnected) <br />RP <br />5. <br />Beverage bottling plants <br />I RP <br />I <br />6. <br />Boilers <br />RP <br />IF-_ <br />7. <br />_. - ....... <br />Breweries <br />RP <br />8. <br />Buildings greater than 3 stories or greater than 34 feet in height from <br />DC 1 <br />curb level <br />1 <br />9. i <br />Buildings with 2 or more service connections (interconnected) <br />DC F <br />10. <br />Buildings with house pumps and/or potable water storage tank <br />DC <br />11 <br />Buildings with wastewater pumping and/or treatment plants (not <br />RP <br />interconnected) <br />I <br />12.I <br />Canneries <br />RP <br />:13.1 <br />Car wash facilities <br />I <br />RP <br />14.1 <br />.. <br />Centralized heating and air conditioning plants <br />i <br />-- <br />RP <br />15.1 <br />....._._ ... <br />Chemical plants <br />j <br />RP <br />16. <br />Chemically treated potable water systems <br />RP <br />17. <br />Civil works (facilities not subject to city plumbing inspection) 3 <br />RP1 <br />Ordinance No. NS-2921 <br />Page 27 of 57 <br />