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A5 <br /> rj, <br /> !,n{v{rlt:asfrles Gunilmn, Grocery Group <br /> Pet Incorporated <br /> P.O. Box 392 <br /> St.September 14, 1987 (314)621 5400 Louis,5400MO 6 <br /> (3 <br /> Mr. Robert Niblack <br /> California Regional Water Quality Board <br /> Central Valley Region <br /> 3443 Routier Road <br /> Sacramento, CA 95827-3098 <br /> Re: OGDEN FOODS UNDERGROUND TANK, STOCKTON, SAN JOAQUIN COUNTY <br /> Dear Mr. Niblack: <br /> The attached information is being submitted in response to your <br /> agency's letter of August 13, 1987, from Antonia K. J. Vorster <br /> requesting additional soil sampling and ground water monitoring <br /> at the referenced site and information addressing specific <br /> concerns about the report entitled, "Ogden Food Products Corporation <br /> Soil and Ground Water Investigation, Stockton, California" prepared <br /> and submitted by J. H. Kleinfelder & Associates. <br /> The enclosed letter to Ms. Vorster, prepared by Eric S. Findlay <br /> of Kleinfelder, addresses questions concerning the various plates <br /> contouring fuel oil contamination levels (Item #1) and the PID <br /> ratings (Item #2) with accompanying TIP information from the <br /> manufacturer. The site map shows the location of the two supply <br /> wells and an abandoned well which has been plugged and sealed with <br /> concrete. <br /> The enclosed test results of EPA Analytical Methods 8240 and 8270 <br /> performed on the two composited soil samples collected from Boring <br /> B-17 on August 26, 1987 are indicative of concentrations of <br /> chemical constituents associated with No. 6 fuel oil. It is our <br /> understanding that you were concerned about the levels of PCB's <br /> that might be present. We were informed by laboratory personnel <br /> that due to the interference from the napthalene concentrations, <br /> detection limits for PCB's would be less than 100 ppm using the <br /> EPA methods you requested. The laboratory (ENSECO) is presently <br /> employing EPA Method 8080 to test for PCB's. The initial screening <br /> indicates a 957 confidence level that PCB's are not present. The <br /> final analysis for PCB's will be forwarded to you as soon as <br /> practicable. <br /> Initial water levels in the three shallow monitoring wells (MW-1, <br /> MW-2, & MW-3) were measured and indicate approximately a 0.004 <br /> gradient to the northeast. <br /> When comparing the attached laboratory results with the chemical <br /> General Offices at Pet Plaza 400 South Fourth Street St. Louis, MO 63102 <br />