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' • AQUIFER TESTING WORK PA FORMER PUREGRO FACILITY ' 1905 NORTH BROADWAY AVENUE STOCKTON, CALIFORNIA SIERRA-PACIFIC PROJECT NO. 94-055.05 1.0 INTRODUCTION In the mid-1980's,traces of 1,2-dichloropropane(aka propylene dichloride, 1,2-DCP, 1,2-D,and DCP) ' and other volatile halogenated hydrocarbon (halocarbon) compounds were detected in ground-water ' samples from east Stockton and other parts of the San Joaquin Valley. The State Water Resources Control Board(State Board)then focused its regulatory attention on agricultural-chemical distributors ' and manufacturers. After a brief Statewide investigation into potential industrial sources of halocarbon contamination,the Central Valley Region,California Regional Water Quality Control Board(RWQCB) requested that Union Oil Company of California(Unocal)take steps to define the extent of fertilizer and 1,2-DCP concentrations believed to be present in shallow ground water at a former PureGro Company ' (PureGro)facility located at 1905 North Broadway Avenue,Stockton,California. The north half of the Broadway Avenue site was once operated by Brea Agricultural Services,Inc. (Brea), so it is sometimes referred to as the PureGro/Brea facility. For this document,the site will be called the PureGro Stockton facility. i The PureGro Stockton facility is located in east Stockton, approximately one-quarter mile southwest of Highway 99 at Waterloo Road(Figure 1). The area is zoned for industrial-and residential-use. Prior to World War II, the area was mostly farmland, and a few small orchards still exist. Most of the ' structures in the area are small single-family dwellings which were constructed during the 1930s and late 1940s. Local businesses include a machine shop,mechanical contractor,trucking firm,farm supply,gas stations,a storage shed complex,and clay tile contractors. No elementary schools,churches,hospitals, or medical clinics are situated within 2000 feet of the facility (Figure 2). Gianone Park, which has a ' popular senior citizens recreation facility,is located about 1000 feet southwest of the PureGro Stockton ' site. The facility was purchased by Crop Production Service, Inc. (CPS) in about 1992. CPS (and the PureGro Stockton facility) were then purchased by Western Farm Services, Inc. (Western) in 1996. ' SIERRA-PACIFIC GROUP 1