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1 <br /> PHASE ONE <br /> ENVIRONMENTAL <br /> REPORT <br />' Groundwater Monitoring <br /> Summer Quarter 1996 <br /> rWestern Lift Facility <br /> 3430 South El Dorado Street <br /> IStockton, California <br /> Project No 102 2 <br /> IOctober 10, 1996 <br /> EXECUTIVE SUMMARY <br /> This report summarizes the summer quarter 1996 round of groundwater monitoring and <br /> testing that took place on September 3, 1996 The test results showed that levels of <br /> volatile organic compounds (BTEX) and total petroleum hydrocarbons (TPH-G) were <br /> present in well MW-1, which was the only well tested in this round Due to the <br /> anomalously high contaminant levels detected, the well was re-sampled on September 16, <br /> 1996 The second sample was found to contain much lower hydrocarbon concentrations, <br /> Ibut still in excess of those detected in the past several years The groundwater gradient is <br /> somewhat steeper than the most recent event of March 28, 1996, but the direction of flow <br /> is similar <br /> 1.0 GROUNDWATER MONITORING <br />' 1.1 Hydrology of Site <br /> On September 3, 1996, the average depth to groundwater was measured to be <br /> approximately 35 feet below surface (or 21 49 feet below MSL) Groundwater has fallen <br /> an average of over 4 feet since the previous monitoring event of March 28, 1996 The <br /> I groundwater gradient was 0 0038 ft/ft, flowing North 49' East (Figure 2) Except for the <br /> depth to groundwater, this data compares favorably to the previous monitoring events in <br /> that the groundwater flow is generally northeast (Table 1 Appendix A) <br /> I <br />