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Western Operations <br /> 1252 Quarry Lane <br /> Pleasanton,CA 94566 <br /> (415)426-2600 -Clayton <br /> Fax(415)426-0106 F N VI'RO N M E N TA L. <br /> #� CONSULTANTS <br /> NOV 1 199(1 <br /> ENVIRONMENTAL-HEALTH <br /> October 29, 1990 PERMIT/'SERVICES <br /> Clayton Project No. 29531.00 <br /> Ms. Diane Hinson <br /> Environmental Health Specialist <br /> SAN JOAQUIN COUNTY PUBLIC HEALTH SERVICES <br /> 445 N. San Joaquin Street <br /> P.O. Box 2009 <br /> Stockton, California 95201 <br /> Subject: Addendum to Soil Excavation and Aeration Report <br /> Dated October 19, 1090 <br /> For Interland Corporation at <br /> 8715 West Grant Line Road <br /> Tracy, California <br /> Dear Ms. Hinson: <br /> This letter is in response to our telephone conversation on October 29, 1990, <br /> regarding,the soil excavation, aeration, and backfilling at the above referenced subject <br /> site. Clayton submitted a report titled "Soil.Excavation'and Aeration for Interland <br /> Corporation", on October 23, 1990. After reviewing this.report, you requested the <br /> .laboratory results of the soil sample collected by Mr. Mike Johnson, of Clayton on <br /> August 17, 1990. This sample was collected from below an,area of stained soil near <br /> the septic .tank which was removed. At.that time you were present to observe the <br /> work activities and evaluate conditions with Mr.'Johnson. <br /> According to my conversation with.Mr. Johnson and rimy review of his field notes, <br /> Clayton documented the following conditions on August 17, 1990: <br /> • Discolored (dark stained) soils were discovered near the soil/water interface <br /> below the septic tank. At your.request, Mr. Torn Ramsey, of Fuel Oil <br /> Polishing, (FOP) overexcavated the stained soil area to-a depth of about 13 <br /> feet below ground'-surface (bgs). After the the stained soil was excavated by <br /> FOP, Mr. Johnson,collected a confirmation sample (IT-4'13T) at a depth of <br /> about 13 feet bgs. Oil and grease was not detected (<10 ppm) in ,this sample. <br /> Laboratory results are attached. <br /> The lateraldistancebetween locations of soil samples ME-1 and IT-4'-BT was <br /> less than 4 feet (Figure 3). According to'Mr. Johnson, the overexcavation by <br /> Clayton Enviran menial Consultants,Inc. A.Marsh&McLennan Company Novi,MI Edison,Nl Wayne,PA Kennesaw,GA <br /> Pleasanton,CA Cypress,CA Windsor,Ontario Toronto,Ontario Birmingham,U.K. London,U.K. Southamplon,U.K., <br />