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CLEAER ' c a o u P • Environrnrntal Services 1 4.3 Nearby Surface Water Bodies ' Review of the USGS topographic map of west Stockton indicates that no potential surface water receptors exist within the search area The results of the survey therefore indicate that the ' hydrocarbon plume poses little or no threat to sensitive receptors in the vicinity at the current time 5.0 CLEAN-UP GOALS In order to formulate a remedial plan for the subject property, clean-up goals for the contaminants of concern must first be identified The Central Valley Regional Water Quality Control Board (CVRWQCB) has established groundwater quality goals for petroleum hydrocarbon constituents to meet municipal beneficial uses The clean-up goals identified for petroleum contaminants in CVRWQCB memorandum are summarized below Contaminant Adopted Maximum Suggested Concentrations to Other Action Minimum ' Contaminant Level meet adopted Secondary Level Levels MCL MCL of 3 odor units Benzene 1 rima 1 I Toluene 150 rima 42 42 Eth lbenzene 700 rima 29 29 Xylene 1,750 rima 17 17 Total Petroleum 100 100 100 Hydrocarbons as Total Petroleum 100 100 100 Hydrocarbons diesel ' Na thalene 20 20 Odor 3 units(secondary) 3 units Lead elemental 15 nma 15 Methyl tert-butyl ether 13 5 35 5 MTBE Although similar clean-up goals for soil have not been published by the CVRWQCB, it is clear any remediation to bring groundwater within the goals noted above will also necessitate Iremediation of soil to mitigate the potential of continued partitioning of contaminants from sorbed-phase to aqueous-phase within the saturated zone over time In fact, experience suggests that remediation of sorbed-phase contamination will often have a greater effect on dissolved- phase contaminant concentrations than attempts at direct groundwater remediation alone The ' California Regional Water Quality Control Board, San Francisco Bay Region (SFRWQCB) is ' ZB178C CAP 9 November 20,2002