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I� LEVINE•FRICKE <br /> ii <br /> equipment has reportedly been tested for PCBs .�within the last 10 <br /> years (approximately 5 years ago) and all circuit breakers, <br /> transmission breakers and transformer conducting and insulating <br /> a fluids reportedly contained less than 5 ppm of PCBs, with three <br /> 1 exceptions: two transformer breakers and one transformer <br /> contained PCB concentrations of greater than 5 ppm (11, 15, and <br /> 85 ppm, respectively) . According to Mr. Meek; all distribution <br /> breakers were below 20 ppm. A lined oil retention pond is <br /> currently under construction (personal communication, Mr. Dave <br /> Meek, January 1989) . Since PCBs are relativeiy immobile <br /> compounds, and since this facility appears to.rbe well maintained, <br /> possible impact on the Site from migration of !PCBs from the <br /> substation is not viewed as likely. <br /> 1 Sewage _Disposal Plant li <br /> a <br /> 1 A sewage disposal plant is located approximately 1/2-mile north <br /> of the Site, near the Fourteenmile Slough's According to Mr. Tim <br /> Anderson of the Stockton Municipal Utilities District (personal <br /> communication, October 1988) , the plant has been shut down for <br /> the past eight to ten years. All wastewater lagoons on site were <br /> reportedly lined with bentonite. No sludge was reportedly <br /> disposed of on site and, except for odor control, no <br /> 1 environmental problems were known to exist with the plant. The <br /> plant was reportedly closed for economic 'reasons. <br /> Ij <br /> 8.0 SUMMARY OF FINDINGS AND CONCLUSIONS FROM SITE BACKGROUND <br /> REVIEW <br /> o background information concerning <br /> 1 As a result of the review f g <br /> Il g <br /> the history of site usage, a review of public records and con- <br /> tacts with public officials concerning the Site, and a field <br /> inspection of the Site and its immediate vicinity, the following <br /> findings were obtained that relate to the potential sources of <br /> hazardous chemicals that could affect soil and_/or ground-water <br /> quality at the Site. <br /> 8.1 Potential on-Site Sources <br /> Agricultural Applications of Pesticides <br /> The Site has been in active agricultural use since at least 1937. <br /> J It is likely that a variety of agricultural chemicals, including <br /> pesticides, have been applied at the Site since it has been under <br /> cultivation. Crops most recently grown at the Site have <br /> reportedly included asparagus, corn, wheat, safflower, alfalfa, <br /> and possibly sugar beets. <br /> According to the current owner of the Site, E1 Dorado Farms (Mr. <br /> Robert Ripkin) , all pesticide and herbicide applications at the <br /> -10- <br />