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10 June 1998 <br /> AGE-NC Project No 95-0101 <br /> Page 6 of 8 <br /> As of November 1996, ten ground water monitoring wells, eight vadose zone wells and eight soil <br /> borings had been installed for the investigation of hydrocarbon-impacted soil and ground water on <br /> the Jackpot Food Mart property located south of the site, directly across Highway 88 This <br /> investigation is not related to the subject property High concentrations of petroleum hydrocarbons <br /> have been detected in monitoring wells at the Jackpot Food Mart site Moderate concentrations of <br /> hydrocarbons were detected in a monitoring well installed within the Highway 88 right-of-way <br /> adjacent to the subject property <br /> 4 0. GROUND WATER MONITORING - MAY 1998 <br /> 41 MONITORING WELL PURGE PROCEDURES <br /> On 26 May 1998 a Solinst water level meter was used to measure the depth to round water in each <br /> Y p g <br /> well relative to the tops of the well casings The relative ground water elevations and hydraulic <br /> gradient were determined from these data (Table 3) <br /> After collection of depth to ground water data, each monitoring well was purged using pre-cleaned <br /> PVC bailers Approximately 6 to 10 gallons of water (minimum of three well volumes) were <br /> removed from each well Ground water stabilization parameters (temperature, pH and conductivity) <br /> were measured at two-gallon intervals using an ICM water analyzer All purged water was placed <br /> in 55-gallon drums and stored on-site pending laboratory results Stabilization data and field logs <br /> are included in Appendix B <br /> 42 COLLECTION OF GROUND WATER SAMPLES <br /> Water samples were collected from each well using new disposable bailers Immediately upon <br /> retrieval, the samples were transferred into 40-m1 EPA-approved VOA vials containing 0 5 ml of <br /> 18%hydrochloric acrd as a preservative The samples were transported in a chilled container under <br /> chain-of-custody to McCampbell Analytical, Inc (MAI) in Pacheco The samples were analyzed for <br /> C Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA <br /> Method 5030 <br /> a Volatile aromatic hydrocarbons(benzene, toluene,ethylbenzene and xylenes, BTE&X) with <br /> methyl tertiary-butyl ether (MTBE) in accordance with EPA Method 602 <br /> a Six oxygenated compounds(MTBE, dr-isopropyl ether [DIPS],ethyl test-butyl [ETBE],tert- <br /> amyl methyl ether [TAME],tert-butanol [TBA] and ethane),n accordance with EPA Method <br /> 8260 <br /> Advanced GcoEn\Eronnllntal,Inc <br />