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22 March 1999 <br /> AGE-NC Protect No 95-0144 <br /> ' Page 2 of 5 <br /> the remannng purged wells,except MW-8 from which 50 gallons was removed(three well volumes) <br /> ' Temperature,pH and conductivity of purged water were measured at regular purge volume intervals <br /> using either an ICM model 52200 water analyzer or a hydac water analyzer The recorded field data ti <br /> ' and'logs are included in Appendix A All purged water was stored in 55-gallon DOT-approved <br /> drums on-site <br /> ' 2 2 COLLECTION OF GROUND WATER SAMPLES <br /> ' Water samples were collected from each purged well dunng both monitoring events, using new <br /> disposable bailers Samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 <br /> ml 18% hydrochloric acid as a sample preservative and into 1-liter amber bottles without <br /> ' preservative The samples were labeled, stored on ice and transported under chain-of-custody to <br /> McCampbell Analytical, Inc (MAI), a California Department of Health Services (DHS)-certified <br /> ' analytical laboratory Selected samples were analyzed for <br /> - Total petroleum hydrocarbons quantified as gasoline (TPH-g), diesel (TPH-d) and motor oil <br /> ' (TPH-mo) in accordance with EPA Methods 5030/8015m . <br /> - Volatile aromatic hydrocarbons (benzene, toluene, ethylbenzene and total xylenes, BTEX) <br /> with methyl tertiary butyl ether(MTBE) in accordance with EPA Method 8020/602 <br /> ' - Oxygenated compounds (di-isopropyl ether [DIPS], ethyl tertiary-butyl ether [ETBE], <br /> MTBE,tertiary-amyl methyl ether [TAME] and tertiary butanol [TBA]) in accordance with <br /> ' EPA Method 8260 modified <br /> ' Samples collected on 03 November 1998 were also analyzed for <br /> ' Volatile organic compounds In accordance with EPA Method 8260 <br /> 3.0. FINDINGS <br /> 3 1 RELATIVE GROUND WATER ELEVATION AND GRADIENT <br /> The elevation of ground water in each well was calculated by subtracting the depth to water from <br /> ' the surveyed casing elevation (Table 1) Due to suspect data, ground water elevations from 03 <br /> November were not utilized Between August 1998 and February 1999, ground water elevation <br /> decreased an average of 0 80 feet in monitoring wells MW-19B, MW-20B and MW-2113, screened <br /> ' Advanced GeoEnvi ron mental,Inc <br />