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MONITORING WELL WATER SAMPLING <br /> Babka Distributing <br /> I 1149 West Weber Street <br /> Stoclton, California <br /> BACKGROUND <br /> The site is located in a flat industrial area in the Port of <br /> Stockton (Figure 1) . There is a large warehouse, a small metal <br /> storage unit, a large asphalt-paved parking area, and a rail spur <br /> on the property. The property was the site of Babka Distributing, <br /> a beer distributorship, until 1989. The property has been vacant <br /> since 1989 . <br /> One 10, 000 gallon gasoline and one 3 , 000 gallon diesel tank were <br /> installed at the site in 1972 . The tanks were used to fuel the <br /> delivery trucks. <br /> Both underground storage tanks were removed from the site by Jim <br /> Thorpe Oil Company in April 1991. Diesel and gasoline contamination <br /> were detected in soil samples collected beneath the tanks. The Bank <br /> of Stockton was directed by San Joaquin County Public Health <br /> Services - Environmental Health Division (PHS/EHD) to perform an <br /> assessment of the lateral and vertical extent of the contamination. <br /> Falcon Energy Associates, Inc. was retained to excavate the <br /> contaminated soil, and Geological Audit Services (GeoAudit) , Inc. <br /> was contracted to supervise the excavation and collect soil <br /> samples. A Site Contamination Workplan to excavate the contaminated <br /> soil and install groundwater monitoring wells was submitted in <br /> December 1991, and excavation began in January 1992 . Monitoring <br /> wells were installed in May 1992 . The first quarterly monitoring <br /> event was performed in early September. <br /> PROCEDURES <br /> IThe standing water was purged and water samples were collected from <br /> the monitoring wells on 10 Ser 1992 . Samples were obtained <br /> after 8 to 9 gallons (approximately our well volumes) of water had <br /> been removed and temperature, pH and conductivity of the ground <br /> water had stabilized (Appendix A) . These parameters were measured <br /> at one gallon intervals using a Hydac water analyzer. The water was <br /> placed in a DOT approved 30-gallon drum and stored on-site. <br /> Water samples were collected using a disposable plastic bailer. Two <br /> 40 ml EPA vials and one 1-liter bottle of water were collected from <br /> each well and transmitted in a chilled container to Alpha <br /> Analytical laboratories in Ukiah. Each sample was analyzed for <br /> total petroleum hydrocarbons (TPH as gasoline and TPH as diesel) <br /> and purgeable aromatics (BTE&X) in accordance with the appropriate <br /> EPA methods. <br />