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15 September 2000 <br /> °-- <br /> AGE-NC Project No. 95-0185 <br /> Page 2 of 3 <br /> 2.2. COLLECTION OF GROUND WATER SAMPLES <br /> Ground water samples were collected from each well using new disposable plastic bailers. Each water <br /> sample was then transferred into one 1-liter amber bottle and three 40-m1 volatile organic analysis <br /> _ (VOA)vials containing 0.5 ml 18%HCI as a sample preservative."I'he samples were then labeled and <br /> placed in a chilled container for transport under chain-of-custody to McCampbell Analytical, Inc. <br /> (MAI), a California Department of Health Services (DHS)-certified analytical laboratory. Each <br /> _ sample was analyzed for: <br /> • Total petroleum hydrocarbons quantified as gasoline and diesel (`I'PH-g and TPII-d) in <br /> — accordance with EPA methods 8015-modified for gasoline and diesel fuel, respectively. <br /> • Purgeablc aromatic compounds(benzene,toluene,ethylbenzene and total xylene: BTE&X) <br /> with methyl tertiary butyl ether (MTBE) in accordance with EPA method 8020. <br /> 3.0. FINDINGS <br /> I. GROUND WATER GRADIENT AND FLOW DIRECTION <br /> During. the .lune 2000 sampling event, the depth to ground water at the site ranged from 18.10 to <br /> _ 18.50 feet bsg. The relative ground water elevation at the site ranged Isom 41.41 to 41.63 feet. The <br /> ground water flow direction determined during this monitoring event is toward the southeast with <br /> a hydraulic gradient of 0.001 feet/feet. The relative ground water elevations at the site are contoured <br /> on Figure 3. <br /> 3.2. GROUND WA'T'ER ANALYTICAL RESULTS <br /> TPH-d was detected in ground water samples collected from monitoring wells MW-1,MW-2,MW-3 <br /> and MW-4 at concentrations of 8,800 micrograms per liter (µg,11), 2.800 µg/l, 82 µg/l. and 4,800 <br /> µg/l,respectively. TPH-g was detected only in ground water sample M W-I ata concentration of 180 <br /> µg/l. <br /> BTE&X and MTBE were not detected in any of the ground water samples. <br /> Current and previous analytical results are summarised in Table 2. The laboratory report (MAI <br /> Laboratory I.D. Nos. 40585 and 40588), quality control and quality assurance data and chain-of- <br /> custody form are included in Appendix B. <br /> Advanced GeoEn%ironmental,]nc. <br />