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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 EI to be at <br />' 17 66, 17 48, 17 76 and 17 75 feet below mean sea level respectively on 27 December 2001 <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 curving toward the southeast at a gradient of 0 0028 ft/ft <br /> IThe groundwater elevation at the site increased an average two (2) feet between September 2001 <br /> and December 2001 The gradient decreased slightly during that period <br /> Groundwater elevations are listed in Table 1, and shown graphically in Figure 4 <br /> I <br /> 32 Groundwater Sample Analysis Results <br /> The groundwater was sampled on 27 December 2001 MW-1 continued to show diesel <br /> contamination at a level similar to that found in the previous quarter For the first time, MW-1 <br /> showed relatively minor contamination from gasoline and MTBE, and showed low levels of <br /> BTEX <br />' MW-2 showed very high motor oil contamination again MW-2 also showed contamination <br /> from diesel, but no gasoline, MTBE or BTEX contamination <br /> MW-3 was free from contamination once again except for low levels of motor oils <br />' MW-4 showed gasoline, BTEX and diesel contamination The level ofg asoline contamination <br /> was high that previous quarters <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 TPH TPHd and TPHo b <br /> Y g { g> ) Y <br /> IEPA Method 8015 <br /> • <br /> Envwroneenng,Inc Project No 02-001014 Page 3 <br />