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Morita Brothers Service Station 18 November 6, 1992 <br /> p. <br /> On October 1, 1992, the relative elevations and locations of the north side of the top of <br /> casing of the three groundwater monitoring wells were surveyed The top of casings <br /> have been referenced to an arbitrary elevation of 100' and are 100' at MW-1, 100562' <br /> at MW-2, and 100125' at MW-3 The depth to water in each of the wells was then <br /> measured to an accuracy of 001' The recorded depths were -5429 in MW-1, -54 88' in <br /> MW-2, and -54 38' in MW-3 The relative groundwater elevations are therefore, 45 80' <br /> at MW-1, 45 682' at MW-2, and 45 745' at MW-3 These groundwater elevations are <br /> presented on Figure 2 along with the resultant groundwater flow direction and <br /> gradient The groundwater flow direction is to the east northeast with a gradient of <br /> approximately 0 002' per 100' This corresponds to the general groundwater flow <br /> direction in the area, and places the other gasoline service station slightly up <br /> 1 gradient in a lateral groundwater flow position at the time of year that these <br /> measurements were made <br /> 4 3 Results-Soil <br /> Anal tical <br /> Analytical <br /> Total Purgeable Petroleum Hydrocarbons as gasoline (TPPHg) was detected in boring <br /> MW-I at a depth of 65 Leet at a concentration of 10 mg/kg The gasoline constituent <br /> volatile aromatics were not detected in this sample TPPH as gasoline and the gasoline <br /> constituent volatile aromatics were not detected in the other soil sample from MW-1, <br /> or the four soil samples MW-2 and MW-3 This includes the soil samples from each <br /> boring trom six inches above the groundwater surface Total lead was detected in the <br /> samples at concentrations ranging from 5 2 mglkg to 8 1 mg/kg Copies of the <br /> analytical reports and chain of custody document are included as Appendix C Table 4 <br /> presents a summary of the analytical results for TPPH as gasoline, the volatile <br /> aromatic hydrocarbons, and total lead in the six soil samples collected during the <br /> drilling of the three monitoring wells <br /> EB-8101-3 9210-E055 RPT <br />■ <br />