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' 13 July 2001 <br />' AGE-NC Project No 96-0232 <br /> Page 9 of 15 <br />' 3 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES <br /> Each ground water sample was logged on a chain-of-custody form,placed in a chilled container and <br />' transported to a California Department of Health Services (DHS)-certified Iaboratory for analysis <br /> for <br />' • TPH-g, TPH-d and TPH-mo by EPA Methods 5030/8015 Modified and 3550/8015 <br /> Modified, respectively, <br />' • BTEX and MTBE by EPA Method 8020, and <br /> • Methanol, ethanol, 1,2-DCA, EDB,TBA, DIPE, ETBE, TAME and MTBE by EPA Method <br />' 8260 Modified <br /> 34 FINDINGS <br /> Ground water elevation, flow direction and gradient were determined from field data collected on <br /> 13 and 14 June 2001, the contaminant Impact to ground water was assessed from the laboratory data <br /> 3 4 1 Ground Water Elevation And Gradient <br /> I During the June 2001 monitoring event,depths to ground water from Flag City Chevron wells MW-1 <br /> through MW-13 were measured between 11 84 and 16 00 feet below the tops of the well casings, <br /> ground water elevations were calculated to be between 3 56 and 6 08 feet below mean sea level <br /> I Ground water elevation at the site decreased an average 3 57 feet between the March 2001 and the <br /> June 2001 ground water monitoring events The June 2001 ground water elevation data collected <br /> from the Flag City Chevron site and the adjacent Three B's Truck Plaza site is depicted in Figures <br /> 3, 4, 5 and 6 <br /> Ground water elevation data collected in the First Zone Aquifer (5 to 35 feet bsg) from Flag City <br /> Chevron monitoring wells MW-1,MW-2,MW-4,MW-5,MW-6A and MW-I OA indicated that local <br /> ground water flow direction was variable (northwest, west and southwestward) and generally <br /> onented toward the area of MW-1 at an approximate gradient of 0 01 ft/ft or less (Figure 3), the <br /> ground water elevation data in the area of Flag City Chevron well MW-7, MW-12A, MW-13A and <br /> Three B's Truck Plaza wells MW-1 through MW-6 indicated that the ground water flow direction <br /> was generally toward the west at an approximate gradient of 0 003 ft/ft or less <br /> Ground water flow direction In the Second Zone Aquifer(40 to 60 feet bsg) from Flag City Chevron <br /> monitoring wells MW-6B, MW-8A, MW-9A, MW-IOB, MW-I 1A, MW-12B and MW-13B was <br /> Advanced GeoEnvironmental,Inc <br />