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f r I • 31 August 1999 AGE-NC Project No 97-0290 Page 3 of 6 ' one-liter amber bottles without preservative After collection, the samples were properly labeled, placed in a chilled container and transported under chain-of-custody to Alpha Analytical I Laboratories Inc (AAL) In Ukiah, a State of California Department of Health Services (DHS)- certified laboratory I25 LABORATORY ANALYSES OF GROUND WATER SAMPLES ' Ground water samples were analyzed for • Total petroleum hydrocarbons quantified as gasoline (TPH-g) and diesel (TPH-d) in accordance with EPA Methods 5030 and 8015m, • Volatile organic compounds (benzene, toluene, ethylbenzene and xylenes, BTEX) with methyl tertiary-butyl ether(MTBE) in accordance with EPA Method 60218020, and • Volatile organics with oxygenated compounds (di-isopropyl ether [DIPS], ethyl tertiary- butyl ether [ETBE], MTBE,tertiary-amyl methyl ether [TAME] and tertiary butanol [TBA]) in accordance with EPA Method 8260B 3.0. FINDINGS Results of the pump test and laboratory analysis of ground water samples and a discussion of data collected during field work follows 3 1 AQUIFER PROPERTIES The pumping rate was calculated to be approximately 3 9 gallonsP er minute (gpm) during the 19 June 1999 test A drawdown of approximately 14 feet was observed in VW IC after 45 minutes of Ipumping The transmisszvlty for well V W 1 C was calculated to be 6,240 gal/day-ft A well efficiency of 47 7 percent was then calculated for V W 1 C,making the calculated aquifer transmisslvity 13,096 gal/day- ft Transmisslvltles of 13,116 gal/day-ft, 22,383 gal/day-ft and 14,420 gal/day-ft were calculated for I MW2, SWI and SW2, respectively The aquifer transmissivtty calculated from V W 1 C and the transmissxvities calculated from MW2 and SW2, each located 10 feet from VWIC, are very similar • The transmisslvlty calculated for SWI, located 20 feet from V W 1 C is significantly higher than wells VWIC, MW2 and SW2 Advanced GeoEnvvonmental,Inc