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7 <br /> WATERWORK <br /> GEOCHEMICAL+GEOTECHNICAL+ENVIRONMENTAL <br /> .y <br /> SEP a & <br /> ENVIRONMENTAL HEALTH <br /> August 4, 1990 PERMIT/SERVICES <br /> Mr. Steve Schneider <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> Re: Addendum to soil remediation plan, Waterloo School, <br /> 7007 North Pezzi, Road, Stockton, CA <br /> Dear Steve: <br /> As per your request, I am writing '`.o addend our May 1$, 1990 soil <br /> remediation plan at Waterloo School. Prior to selecting a soil <br /> remediation alternative, the Schor.l District has agreed to d::ill <br /> soil borings around the former tank pit to define the lateral and <br /> vertical extent of soil contamination. <br /> To define the extent of soil contamina aan 3-30 foot borings will <br /> be drilled around the pit to define the lateral extent of <br /> contamination (see attached figure). A boring will also be <br /> drilled in the center of the former pit and advanced to either <br /> the saturated zone (approximately 70 feet) or when two samples in <br /> a row are determined to be clean. This determination will be <br /> made by field observations and by testing the soil with a <br /> photoionization detector and later confirmed by laboratory <br /> analysis. Soil samples will be collected every five feet and <br /> selected samples will be analyzed for benzene, toluene, <br /> ethylbenzene, xylenes (STEX) and total petroleum hydrocart:ans as <br /> gasoline (TP."G) . The samples will be analyzed by B.C. <br /> Laboratories in Bakersfield, California. <br /> The drilling spoils will be stored on plastic and covered with <br /> the same until the laboratory results are received. The borings <br /> will be abandoned with neat cement. <br /> A letter report will be prepared that includes boring logs, <br /> laboratory results, and conclusions and recommendations. <br /> 171C.MN STREET + ESCALON.CA 95320 + (209),138r3507 <br /> FRES.%0,(7A(209)222.3495 + ZENO,NV(702)78b-6830 <br />