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Former ARCO #760 - 2 - 10 January 2008 <br /> 225 S. Cherokee Ave, Lodi • • <br /> 2. During the three quarters of monitoring conducted since installing MW-6, 1,2-DCA (a <br /> petroleum hydrocarbon constituent) has been detected in each quarter (5.1 ug/L, <br /> 3.5 ug/L, and 0.69 ug/L) and has exceeded the Regional Water Quality Control Board <br /> Water Quality Goals (WQGs: California Primary Maximum Contaminant Level, 0.5 ug/L, <br /> and the Office of Environmental Health Hazard Assessment Public Health Goal, <br /> 0.4 ug/L). Because well MW-6 is an upgradient well with 1,2-DCA concentrations <br /> above WQGs, MW-6 groundwater will be sampled and concentrations will be reported <br /> for all of the petroleum hydrocarbon constituents during the next two quarters (first and <br /> second quarters of 2008) to establish a declining concentrations trend, before Regional <br /> Board staff will consider a reduction to semi-annual sampling for MW-6. <br /> If you have any questions, please call me at (916) 464-4615. <br /> ' f � ''J - <br /> ames L. L. Barton, P.G. <br /> Engineering Geologist <br /> Enclosure <br /> cc: Ms. Margaret Lagorio, San Joaquin County Environmental Health Department, Stockton <br /> Mr. Roger Clark, SECOR International, Inc., 3017 Kilgore Road, Suite 100, <br /> Rancho Cordova 95670 <br />