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r—•sA:cr- nrrf., =I - <br /> WATERWORK <br /> 0 :�. <br /> GEOCHEMICAL•GEOTECHNICAL•ENVRONMENTAL r a, <br /> NOV <br /> �o <br /> ENVI 91989 <br /> November 7, 1989 NMENTAL HEALTH <br /> PERPOITISE'll <br /> b, Mr. Harlin Knoll <br /> San Joaquin County Public Health Services <br /> 2nvixonmental Health Division <br /> P.O. Box 2009 <br /> Stockton, CA 95201 <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 <br /> referenced site I am at the above <br /> writing to present an addendum to the <br /> previously submitted SRP. That plan. pre <br /> Technology Inc, called for in situ soil venting as and based'roundwaton <br /> ,J essentially one boring in the former tank area.. Furthermore the <br /> specified <br /> System was without any permeability data to <br /> guide <br /> extraction well.. spacings .and required air fl <br /> data Svas. .pointed out by the ows. This lack of <br /> Regional Board reviewer <br /> 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 /> ;. SectionSR f low permeability sediment argued for a re-evaluation <br /> ,.x <br /> kWaterWork Corp was retained to to accurately assess the site <br /> stratigraphy and extent of contamination for. the <br /> � y specifying an effective resp p Purpose of <br /> omplished <br /> by logging and sampling Fc.. additional. soil borings atlocationsshown, on Figure 1. All work at the site was <br /> pe <br /> accordance with our workplan for Additional Assessm ntoof d in <br /> Soil <br /> � + and Groundwater Contamination which was submitted on July 10, <br /> 3.989 and approved in October. <br /> The results <br /> r � of sample analysis from the four new strongly <br /> indicates- contamina�ticn associated :with ..a line -leak rather than <br /> extensive tank,tank. leakage. Boring SB12 was .cored continuously -from <br /> surface to 44 #eet and was clearly contaminated throughout based <br /> PID measurements;. odors . and iron/manganese staining, and <br /> laboxator <br /> Y analysis The other three borings <br /> sisoil c <br /> showed no <br /> gnificant ' ontamination, although boring 14 had some very <br /> 1710 MAW STREET • ESCALON,CA 95320 .• (209)838-3507 <br /> FRESNO,CA(209)222-3495 • RENO.NV(702)%88-6830 <br />