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WATERWORK- <br /> GEOCHEMICAL•GEOTECHNICAL• ENVIRONMENTAL <br /> n D <br /> ly <br /> November 7, 1989 v <br /> Mr. Harlin Knoll <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 2009 -NViRONMENIALNE,ALT� <br /> Stockton, CA 95201 �FRpAITIcFR`��� <br /> Re: Soil Remediation Plan - Knowles Property, 1140 W. <br /> Hammer Lane, Stockton, CA <br /> Dear Mr. Knoll: <br /> In order to expedite remediation activities at the above <br /> referenced site I am writing to present an addendum to the <br /> previously submitted SRP. That plan prepared by Groundwater <br /> Technology Inc, called for in situ soil venting and was based on <br /> essentially one boring in the former tank area. Furthermore the <br /> system was specified without any permeability data to guide <br /> extraction well spacings and required air flows. This lack of <br /> data was pointed out by the Regional Board reviewer in their <br /> comments on the SRP. <br /> The lack of details regarding the distribution of contamination <br /> and the fact that the soil profile was comprised of a significant <br /> section of low permeability sediment argued for a re-evaluation <br /> of the SRP. <br /> WaterWork Corp was retained to more accurately assess the site <br /> stratigraphy and extent of contamination for the purpose of <br /> specifying an effective remediation plan. This was accomplished <br /> by logging and sampling four additional soil borings at locations <br /> shown on Figure 1 . All work at the site was performed in <br /> accordance with our Workplan for Additional Assessment of Soil <br /> and Groundwater Contamination which was submitted on July 10, <br /> 1989 and approved in October. <br /> The results of sample analysis from the four new borings strongly <br /> indicates contamination associated with a line leak rather than <br /> extensive tank leakage. Boring SB12 was cored continuously from <br /> surface to 44 feet and was clearly contaminated throughout based <br /> on PID measurements, odors and iron/manganese staining, and <br /> laboratory analysis . The other three borings showed no <br /> significant soil contamination, although boring 14 had some very <br /> 1710 MAIN STREET • ESCALOR CA 95320 • (209)838-3507 <br /> FRESNO,CA(209) 222-3495 9 RENO, NV(702) 788-6830 <br />