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' 22 <br /> 6. DISCUSSION <br /> 6.9 GENERAL WATER QUALITYIN THE SITE VICINITY <br /> Aside from consideration of the impacts of the subject release of petroleum <br /> ' hydrocarbons, general water quality in the vicinity of the Site is poor and does not meet <br /> Califomia State standards for acceptable drinking water Site upgradient monitoring and cross- <br /> gradient wells do not meet water quality objective as specified in the Water Quality Control <br /> Plan (Basun PIan) for the San Joaquin River Basun dated September, 1998 The Basun Plan <br /> ' directly references California State Department of Health Services Maximum Contaminant <br /> Limits (MCLs) as the applicable water quality goals for the Basun Plan, and does not <br /> ' differentiate between Primary and Secondary MCLs Therefore, wells which exceed the Basun <br /> Plan objectives also exceed the California State MCLs Wells th ons rents aboy-�—the <br /> ' MCL would not be considered safe for dri nlang <br /> Table 6-1 indicates the MCL for general water quality parameters and summarizes the <br /> Site well which do not meet the MCL and Basin Plan Objective <br /> Based on water sampling conducted during the last two groundwater monitoring <br /> ' events, Total Dissolved Solids(TDS) at the Site exceeds the MCL of 500,000 ug/L in all wells <br /> at the Site and has been measured as high as 1,700,000 ug/L.in a well that is upgradient to the <br /> ' petroleum hydrocarbon groundwater plume center TDS in Site wells typically ranges from <br /> 800,000 to 1,700,000 ug/L <br /> 1 <br /> 1 <br /> 1 <br />