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15 May 2000 <br /> AGE-NC Project No 95-0167 <br /> ' Page 3 of 5 <br /> ' (TPH-g), volatile aromatic compounds (benzene, toluene, ethyl-benzene and total xylene <br /> BTEX) and fuel oxygenating compounds including dr-isopropyl ether(DIPE),ethyl tertiary- <br /> butyl ether(ETBE), ethanol, methyl-tertiary butyl ether (MTBE), tertiary-amyl methyl ether <br /> ' (TAME) and tertiary-butanol (TBA), <br /> • Preparation of this report presenting the findings and results of the investigation activities <br /> 1 <br /> 40. FIELD PROCEDURES <br /> ' 41 GROUND WATER MONITORING ACTIVITIES <br /> ' On 10 February 2000, the water level in each monitoring well was measured relative to the tops of <br /> the well casings using a Solinst water level meter After water levels were measured, a two-stage <br /> submersible pump was used to purge each well Ten to twelve gallons (minimum of three well <br /> volumes) of water were removed from each well Temperature, pH and conductivity were measured <br /> at two-gallon purge-volume intervals using an ICM water analyzer during purging The <br /> '• measurements had generally stabilized by the end of the purging process (Appendix A) Purged <br /> water was stored on-site in 55-gallon, Department of 1 ransportatron (DOT)-approved drums <br /> ' 42 COLLECTION OF GROUND WATER SAMPLES <br /> ' Prior to collection of ground water samples, the depth to ground water was re-measured in each <br /> purged well to ensure that a minimum of 80% of the well volume had recharged Water samples <br /> were collected from each well using a new disposable plastic bailer Each water sample was <br />' transferred into three chilled 40-m1 volatile organic analysis (VOA) vials containing 0 5 ml 18% <br /> HCL as a sample preservative After collection, the samples were labeled and placed in a chilled <br /> container for transportation under chain-of-custody to McCampbell Analytical, Inc (MAI), a <br />' California Department of Health Services (DHS)-certified analytical laboratory located in Pacheco, <br /> California Each sample was analyzed for <br />' • Total petroleum hydrocarbons quantified as gasoline(TPH-g)by EPA Method 8015-modified <br /> for each range of hydrocarbons, <br />' • Volatile aromatic compounds benzene, toluene, ethylbenzene and total xylenes (BTEX) by <br /> - EPA Method 8020, and <br /> • Oxygenated compounds, di-isopropyl ether(DIPE), ethyl tertiary butyl ether(ETBE),methyl <br />' tertiary-butyl ether(MTBE),tertiary amyl methyl ether(TAME)tertiary butyl alcohol (TBA) <br /> . by EPA Method 8260-modified <br />