Laserfiche WebLink
E <br /> 'IT111RD-QUARTER 1995 <br /> QUARTERLY MONITORING REPORT. <br /> � FORMER PUREGRO/BREA FACILITY <br /> 1905 NORTH BROADWAY AVENUE <br /> RECEIVED .- <br /> STOCKTON, CALIFORNIA OCT 191995 <br /> SIERRA-PACIFIC PROJECT NO. 94-055.04 <br /> ENVIRONMENTAL HEALTH <br /> j PERMIT/SERVICES <br /> ` 1.0 BACKGROUND ' <br /> Union Oil Company of California (dba Unocal) authorized Sierra-Pacific Groundwater <br /> Consultants, Inc. (Sierra-Pacific) to undertake a ground-water investigation at an agricultural- <br /> chemical (ag-chem) facility located at 1905 North Broadway Avenue, Stockton (Figures 1 and <br />�r <br /> 2). Before 1992, the six-acre ag-chem facility had been operated by various companies, <br /> including PureGro Company and Brea Agricultural Services, Inc. Crop Production Services <br /> (CPS), the current operator, bought the facility from PureGro Company (Unocal) in 1992. <br /> In the mid-1980's, traces of 1,2-DCP (aka propylene dichloride and 1,2-dichloropropane) and <br /> other petro-chemicals were being detected in ground-water samples from east Stockton and <br /> other parts of the San Joaquin Valley. The State Water Resources Control Board then focused <br /> Jits regulatory attention on ag-chem distributors and manufacturers, and environmental cleanup <br /> work began at the PureGro/Brea site. By 1993, traces of 1,2-DCP and nitrates were being <br />' detected in ground-water samples collected from four new monitoring wells at the site. <br /> � P g <br /> F <br />` In October 1994, Sierra-Pacific installed two additional monitoring wells,approximately 300 feet <br /> west of the PureGro/Brea site, to determine if ag-chemicals have been transported down- <br /> gradient from the site by ground-water movement (Figure 3). Monitoring well MW-5 was <br /> installed five feet west of the centerline of Sutro Avenue, approximately 40 feet north of Lewis <br /> Street. MW-6 was installed five feet west of the centerline of Sutro Avenue, approximately five <br /> feet north ofCharles Street. On September 18, 1995, Sierra-Pacific measured the water level <br /> and collected water samples at a solitary monitoring well located at 1705 North Broadway <br /> Avenue. The well (MW-11) is located about 200 feet south of the former PureGro/Brea site <br /> (Figure 3). Additional project information is available in earlier consultant reports, the titles <br /> of which are listed in Section 6.0 of this report. <br /> Sierra-Pacific Groundwater Consultants 1 <br />