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SITE CONTAMINATION WORK PLAN Ill N. Pershing Avenue Stockton, California LO BACKGROUND As part of an intended property purchase in 1993, the tenants of the property located at 711 N. Pershing Avenue in Stockton, California(Figure 1)retained RESNA Industries of Sacramento, California to perform a limited soil investigation on the property. RESNA personnel drilled four shallow holes with a hand auger and collected soil samples for laboratory analysis(Figure 2). The four samples were obtained from a depth of 5 feet and analyzed for the presence of petroleum hydrocarbons in the gasoline, diesel, and oil & grease ranges, as well as for various pesticides and PCB's. DDT and/or chlordane were detected in three of the samples, and heavy hydrocarbons (diesel and oil & grease)were also detected in one of these(Table 1). Based on these results, it is our understanding that RESNA provided its client,the Swett& Crawford Group, an estimate of the cost to further assess and remove the detected contaminants. The sale of the property has therefore been postponed pending further investigation,at the request of Swett& Crawford. The property owners subsequently retained Upgradient Environmental Consultants of Sacramento, California in June, 1994 to develop a plan for additional investigation of the reported contamination. At the suggestion of Mr. Michael Infurna, SRES, of San Joaquin County Environmental Health Division,Upgradient recommended a limited investigation of nearby properties to assess the severity and extent of pesticide contamination in the area. In November and December, 1994, soil sampling performed by Upgradient personnel failed to detect any petroleum or pesticide compounds. Upgradient submitted its report in December and recommended site closure, However,the Water Quality Control Board was concerned about pesticides detected in the RESNA report. They have requested further investigation of the soil and a limited investigation of groundwater. In addition,the Water Quality Control Board requested removal and disposal of soil in the area where chlordane pesticides were detected. 2.0 PROPOSED ASSESSMENT Upgradient proposes to drill one soil boring in the area were RESNA detected pesticides. Soil and water samples will be obtained an analyzed. 1f chlordane or other pesticides are detected, a backhoe will be mobilized at a later date to excavate approximately six cubic yards of soil in the