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approximately 50 feet bgs. Unsaturated zone materials in the Lodi area consist of a mixture of <br /> sand, silt, and clay. Site-specific investigations near the Busy Bee site revealed a 5-foot-thick clay <br /> layer, which may or may not be present beneath the site. (8) The regional groundwater flow <br /> direction is generally to the southwest (22). <br /> 4.2.2 Groundwater Targets. In the Lodi area, groundwater is a source of water for drinking <br /> and commercial irrigation. Drinking water in the City of Lodi is supplied by 24 municipal wells in <br /> a blended system. Three wells (wells 3, 4, and 12) were put out of service due to PCE and TCE <br /> contamination. Currently, 21 active municipal wells within a 4-mile radius of the Busy Bee site <br /> supply water to the 53,186 residents of Lodi. The city is served by a pressurized grid water <br /> system that is fed directly by the wells based on demand. (22) <br /> The nearest municipal water well to the Busy Bee site is Well 4, located 0.1 mile north <br /> (upgradient) of the site. Well 4 was put out of service in May 1990. Well 3 is 0.3 mile <br /> downgradient of the site. <br /> 4.2.3 Groundwater Pathway Conclusion. A release of PCE into the groundwater may have <br /> occurred from previous activities at the Busy Bee site. Condensation wastewater, a source of PCE <br /> contamination, was likely to have been discharged into the sewer line (6). Soil gas and sewer line <br /> samplings conducted by the RWQCB in September and December 1989 show PCE <br /> contamination near the Busy Bee site (7). Site-specific investigations conducted by L&S showed <br /> soil and groundwater contamination with PCE around the site (8). Groundwater occurs at a depth <br /> of approximately 50 feet bgs (8). The City of Lodi operates 24 municipal wells in a blended <br /> drinking water system that supplies water to 53,186 inhabitants (22). Site-specific investigations <br /> by L&S indicated the presence of a 5-feet-thick clay layer in all the three soil borings. The clay <br /> layer may or may not be present beneath the site. (8) <br /> 4.3 Surface Water Pathway <br /> The South Main Canal, approximately 1.8 miles southwest of the site, is the nearest surface body <br /> of water. The canal originates in the Mokelumne River and is bermed by an 8- to 10-foot levee. <br /> The canal transports irrigation water to farmers south and west of Lodi. It is not used for drinking, <br /> fishing, or recreational purposes. (22) Several endangered species can be found along the <br /> canal (23). <br /> All hazardous substances used, and wastes generated at the Busy Bee site are stored in an enclosed <br /> building. Given the distance to the nearest surface body of water, site-related contaminants pose <br /> little threat to surface water. <br /> 4.4 Soil Exposure and Air Pathway <br /> Busy Bee is located in a mixed commercial and residential area of Lodi. The Busy Bee site is <br /> located in an enclosed building. The site is completely paved. (10) Only subsurface soil <br /> contamination around the site has been documented. All hazardous substances used and wastes <br /> generated are stored in the enclosed building (10). Busy Bee has a San Joaquin Air Pollution <br /> Control District emissions permit. There is no record of violations or citations issued to Busy Bee <br /> by the District. (19) No residences, schools, or daycare centers are on or within 200 feet of the <br /> site (10). <br /> SI Busy Bee Laundry and Cleaning-0(F)• 1/93 9 Printed on 50%recycled paper. Z <br />