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feet below mean sea level respectively, based upon casing elevation data from Kier & Wright , <br /> Civil Engineers and Surveyors <br /> • <br /> 30 FINDINGS <br /> 3.1 Groundwater Level Measurements <br /> The elevation of groundwater in MW-1, MW-2, MW-3 and MW-4 was calculated by El: to be at <br /> 16 05, 16 11, 16 10 and 16 17 feet below mean sea level respectively on 21 March 2002 <br />' EI utilized the groundwater measurements to determine the direction of groundwater flow and <br /> the groundwater gradient present beneath the surface The groundwater direction of flow for the <br /> area was inferred to be easterly at a gradient of 0 001 ft/ft ' <br /> The groundwater elevation at the site increased an average two (2) feet between December 2001 <br /> and March 2002 The gradient decreased slightly during that period <br /> Groundwater elevations are listed in Table 1, and shown graphically in Figure,4' <br /> 3.2 Groundwater Sample Analysis Results <br /> The groundwater was sampled on 21 March 2002 MW-1 continued to show diesel and gasoline <br /> contamination at a level similar to that found in the previous quarter No MTBE or BTEX was <br /> evident <br /> rMW-2's motor oil contamination decreased by a factor of 10 MW-2 also showed contamination <br /> from diesel, gasoline and BTEX, but no MTBE contamination <br /> MW-3 was showed minor contamination from low levels of motor oils an i <br /> o d diesel <br /> MW-4 continued to show gasoline, BTEX, D1PE and diesel contamination <br />' All groundwater samples secured by EI were logged in a chain-of-custody form, placed in an on- <br /> site refrigerator and picked up by a California Department of Health Services (DHS) certified <br /> laboratory for analysis for <br /> Total petroleum hydrocarbons as diesel, oil and gasoline (TPHg, TPHd and TPHo) by <br /> EPA Method 8015 <br /> I <br /> Environeering,Inc Project No 02 004 15 Page 3 <br />