SITE INFORMATION AND CORRESPONDENCE

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lines on the first occasion, the video was determined to be inconclusive due to the pooling of water in the depressed areas along the sewer line. Prior to the second survey, water was removed from the sewer line. No cracks were observed during the second video survey. (8) 2.4.4 San Joaquin Valley Unified Air Pollution Control District. The San Joaquin Valley Unified Air Pollution Control District issued an emissions permit to Busy Bee on July 1, 1992. Busy Bee is permitted to emit 6.6 pounds per day of volatile organic carbon (VOC) to the air. There is no known record of any citations or violations of the emissions permit issued to Busy Bee. (19) 3.0 INVESTIGATIVE EFFORTS 3.1 Previous Sampling and Analyses 3.1.1 Groundwater Sampling. To comply with the EPA's regulations, the City of Lodi is required to sample all their municipal groundwater wells every three years. In June 1989, the City of Lodi sampled their municipal groundwater wells (2). PCE contamination with concentration levels of approximately 160 ppb, and TCE contamination with concentration levels of 6.4 ppb were detected in Well 3, located approximately 0.3 mile southwest of the Busy Bee site (5). A confirmation sampling of Well 3 was conducted in July 1989. Results of laboratory analyses indicated that both PCE and TCE concentrations exceeded their respective maximum contamination levels (17). Well 3 was put out of service. The City of Lodi continued to monitor Well 3 throughout 1989, and the highest level of PCE detected was 260 ppb (8). To determine the extent of soil and groundwater contamination at the Busy Bee site, L&S conducted a field investigation in February 1991. Three soil borings were advanced to a maximum depth of 58 feet using a hollow-stem auger. Groundwater samples were collected with disposable bailers from the top of the saturated zone at each boring location, and analyzed for volatile halogenated hydrocarbons using EPA Method 601. Groundwater samples collected from all three borings contained PCE. The PCE concentrations detected in the groundwater samples ranged from 1,900 ppb to 4,400 ppb. (8) 3.1.2 Sewer and Wastewater Sampling. The RWQCB staff inspected Busy Bee on August 23, 1989 and noted that two hoses from the dry cleaning machine were discharging liquid into the sewer line. One hose discharged cooling water, which had circulated through the machine, and the other hose discharged condensation water. Samples of these discharges were collected on August 24, 1989. (4) The cooling water sample contained 0.69 ppb of 1,1-dichloroethylene, 2.1 ppb of TCE, and 0.66 ppb of PCE. The condensation water sample contained 0.67 ppb of 1,1-dichloroethylene, 2.0 ppb of TCE, and 12 ppb of PCE. (7) The RWQCB collected samples of rinsewater and washwater from the washing machine on August 28 and September 11, 1990. Concentration levels of PCE in all the samples exceeded the maximum contamination level. Samples of rinsewater and washwater collected on August 28 had concentrations of PCE of 37.3 ppb and 5.4 ppb, respectively. Samples of rinsewater and washwater collected on September 11 had concentrations of PCE of 9.2 ppb and 14.1 ppb, respectively. The RWQCB also collected condensation water and cooling water from the dry cleaning machine on August 28, 1990. Concentration levels of PCE in the condensation water and cooling water samples were 1.4 ppb and 1.2 ppb,respectively. (8) SI Busy Bee Laundry and Cleaning-0(F)• 1/93 6 Printed on 50%recycled paper.