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J•� that it will demarcate a WQLZ and allow for enforcement As indicated, it is proposed that the compliance boundary be established as part of establishing a WQLZ 3.1.2 Water Quality Goals Within the compliance boundary, where background groundwater conditions do not warrant protection, restoration takes precedent Numeric water quality goals for the residual plume are associated with restoring the relevant beneficial water use that protects all other relevant uses To identify numeric goals, the relevant beneficial water use with the most stringent set of numeric water quality goals is identified Resolution 88-63 provides relevant guidance " Resolution 88-63 specifies that all groundwater is suitable for municipal and domestic supply, unless conditions preclude its use Since groundwater conditions beneath the site do not preclude its possible use as a municipal and domestic supply, numeric water quality goals associated with restoring this use pertain to the residual plume Municipal and domestic supply is the relevant beneficial use with the most stringent set of water quality goals The water quality goals are noted below Concentration Compound arts per billion Source Benzene 10 California Primary Maxunum Contaminant Levels Toluene 42 Taste and Odor Threshold Eth lbenzene 29 Taste and Odor Threshold Xylenes 17 Taste and Odor Threshold TPH-d 1,000 Taste and Odor Threshold It should be noted that other conditions may make the use of shallow occurring groundwater for muructpal supply unlikely Use as a drinking water source may necessitate water treat- ment, regardless of petroleum hydrocarbon impact The aforementioned water quality goals apply to the site during remediation and beyond, however, they may be modified at any time if it can be shown that changes are (1) consistent with the maximum benefit to the people of the State, and (2)will not unreasonably affect present or probable future beneficial uses of groundwater To summarize, water quality protection standards and water quality goals were developed Water quality protection standards were established to protect unaffected groundwater outside the proposed compliance boundary Water quality goals were specified to direct restoration of affected groundwater within the compliance boundary As part of establishing a compliance boundary, it was proposed a WQLZ be created 3201337B/1918REV 11 August 31, 1995