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WATERWORK <br /> GEOCWENICAL•GEOTFOANrCAL•ENMPON,MENTAL <br /> August 4, 1990 <br /> Fqg <br /> Mr. Steve Schneider icy <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 to addend our May 18, 1990 soil <br /> remediation plan at Waterloo School. Prior to selecting a soil, <br /> remediation alternative, the School Distriot has agreed to drill <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 contamination 3-30 Foot borings will <br /> be drilled around the pit to define the lateral extent of <br /> contamination (see attached figure). A bo.--'ng 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 detbrmination will be <br /> made by field observations and by testing the soil with a <br /> photol.onization 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 (BTEX) and total petroleum hydrocarbons as <br /> gasoline (TPHG). 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 /> 1710,MAIN,A7EE, • ESCALON,C?•v�120 • r200)838-1507 <br /> RESNO,CA(209)222.3595 • RENIO.NV(702) 7aN4C830 <br /> bi2'd dJOD >1d10 T331tJII 60:9T 05, t'0 d3S <br />