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t <br /> Project 2520-100 01 <br /> Pro <br /> Mr Jerry Moore J <br /> October 11, 1994 <br /> Page 2 <br /> GROUNDWATER FLOW DIRECTION <br /> Historical and third quarter 1994 water level measurements are summarized in Table 1 <br /> The water level measurements collected on September 2, 1994, were used to calculate <br /> groundwater elevations in wells MW-1 through MW-9 Figure 21s a groundwater contour <br /> map based on the September 1994 groundwater elevations Interpretation of the September <br /> 1994 groundwater elevation data indicates a general southwest direction of groundwater <br /> flow with an approximate gradient of 0 004 foot per foot <br /> ANALYTICAL RESULTS <br /> Certified analytical reports and chain-of-custody records are located in Attachment B <br /> Historical and third quarter 1994 analytical results are summarized in Table 2 <br /> Petroleum hydrocarbons were not detected in the groundwater samples collected from <br /> wells MW-2 and MW-5 through MW-9 during the third quarter 1994 monitoring event <br /> Concentrations of petroleum hydrocarbons detected in wells MW-1 and MW-4 during the <br /> third quarter of 1994 are generally lower than concentrations detected in the second <br /> • quarter of 1994, while concentrations of petroleum hydrocarbons detected in well MW-3 <br /> during the third quarter of 1994 are generally higher than concentrations detected in the <br /> second quarter of 1994 Concentrations of 1,2-dichloroethane detected in wells MW-1 <br /> through MW-5 ranged from 27 to 52 micrograms per liter (pg/L) Figure 3 shows <br /> concentrations of benzene detected in groundwater during the September 1994 monitoring <br /> event <br /> As recommended by the San Joaquin County Public Health Services, Environmental <br /> Health Division, in its August 9, 1994, letter to Moore Petroleum, EMCON collected a <br /> sample of water from a domestic well located south of the site (DW-2) on property <br /> owned by Timothy Rhode The sample was analyzed for total petroleum hydrocarbons as <br /> gasoline and benzene, ethylbenzene, toluene, and xylenes Petroleum hydrocarbons were <br /> not detected in water sample DW-2 <br /> Petroleum hydrocarbons were not detected in the water sample (DW-1)collected from the <br /> on-site domestic well, although 1,2-dlchloroethane was detected in water sample DW-1 <br /> at a concentration of 0 6 pg/L <br /> SAC/PJ2\252025201000 ldl-94 Ifc 2 <br />