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MW-6, also in November 1991. Two quarters of groundwater <br /> sampling from MW-6 have shown much lower TPH-diesel <br />' concentrations. In February 1992, TPH-diesel was detected at <br /> 0 6 mg/l, in May 1992, the measured concentration was 12 me <br />' The potential threat to groundwater is important and will not be <br /> ignored by Safeway Based on the analytical results from well <br /> sampling, however, groundwater impacts have been minimal. <br />' Cross-sectional diagrams were not provided <br /> Cross sections for both soil and groundwater have been provided <br />' in this report (see Figures 2-7 through 2-12) <br /> Status of investigation and cleanup activities including the results <br />' of all investigations completed to date <br /> Sections 2 and 3 of this report summarize all of the work <br /> completed on site to date <br /> • Proposed continuing or next phase of the investigation <br />' Safeway has requested ERM to continue the current quarterly <br /> groundwater monitoring program No other action is planned <br /> • Method of cleanup proposed, schedule for the completion of the <br /> investigation of the site, and remediation <br /> No schedule has been prepared for further investigation. Based <br /> on the lack of significant impacts to soils and groundwater, there <br /> are no plans for remedial activities at the site. <br /> I • Method and location of disposal of contaminated soils and <br /> groundwater <br /> ISoil cuttings from drilling activities are being biologically treated <br /> on site Cuttings containing diesel have been mixed with the <br /> commercially prepared product X-19 The X-19 material is a <br /> mixture of organic matter, nutrients and micro-organisms <br /> designed to break down fuel hydrocarbons. The X-19/soil mixture <br /> will be sampled during the third quarter sampling event, <br /> scheduled for August 1992 <br /> Purge water from the sampling events is stored in drums on site <br /> A composite purge water sample collected in November 1991 <br /> showed no TPH present Recent sampling events have shown <br /> TPH concentrations to be no greater than 12 mg/l. Since the <br /> concentrations of diesel are so low, Safeway requests that the <br /> County allow drummed water to be dumped into the sewer system <br /> or be used for irrigation purposes on site <br /> I <br /> 42 <br />