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, T , Iv 01 May 2000 • AGE-NC Project No 96-0232 1 Page 7 of 11 ensure that visible air bubbles were not present In the vials after filling and capping±Ground water sample containers were labeled with the well designation, date, time, and sampler's initials 5 3 LABORATORY ANALYSIS OF GROUND WATER SAMPLES IEach ground water sample was logged on a chain-of-custody form, placed in a clulled container and transported t&a California Department of Health Services (DHS)-certified laboratory for analysis ' for • Total petroleum hydrocarbons quantified as diesel (TPH-d) by EPA Method 8015M, • TPH-g, BTEX, MTBE, methylene, ethylene, ethylene dibromide (EDB), 1,2-Dichloroethane (1,2-DCA), Tertiary butanol (TBA), di-isopropyl ether(DIPE), ethyl tert butyl ether (ETBE), tert amyl methyl ether (TAME) and MTBE by EPA Method 8260B I - r' 54 FINDINGS Ground water elevation, flow direction and gradient were determined from field data collected on 28 Maich 2000, the contaminant impact io ground water was assessed from the laboratory data _ y 5 4 1 RELATIVE GROUND WATER ELEVATION AND GRADIEN I During the Mazch 2000 monitoring event, depths to grourid water from Flag City Chevron wells fMW-1, MW-2, MW-4, MW-5, MW-6A, MW-6B and MW-7 \vete measured betweein 6 29 and 7 64 feet below the tops of the v ell casings, groundwater elevations were calculated to be between 1�95 ; feet and 2 11'feet above mean sea level Ground water elevation at the site decreased an average 0 15 r feet between the February 2000 and the March 2000 ground water monitoring events The ground water elevation data collected on�28 March 2000 from the Flag City Chevron site and the adjacent , L ' Three B's Truck Plaza site is depicted in Figure 3' t } Ground water momtonng data collected in the area of Flag City Chevron monitoring wells MW-1, ' MW-2, MW-4, MW-5 and MW-6A indicated that the giouhd water flow direction Na as generally ranging from the north-northeast' to" north-northwest at an avej age gY adient of 0 003 ft/it, or approximately 16 feet per anile (Figure 3), the ground water flow direction in the area of well MW-7 ' was gencrally toward the east at a gradient of,0 005 ft/ft (26 feet per mule) Ground water was approxiinately 36 feet above the screen interval of MW6-B , � 1 4d+anccd GCOEn%iron nit nldE,Inc s