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3750.Auburn Blvd., Suite A <br /> Sacramento, CA 95821 <br /> 48 1 1 N I C K =�w 1, 18 N1 8 <br /> Fil. ........ <br /> 1� '' <br /> ENGINEERING AND ENVIRONMENTAL SERVICES IU? -te <br /> lephone: (916) 4857222 <br /> MAY 2 6 1992 FAX: (916)485-8098 <br /> ENVIRONMENTAl- HEALTH 22 May 1992 <br /> Ms. Linda Turkatte PERM!T/SURTICES <br /> San Joaquin County Public Health Services Department <br /> Post Office Box 2009 <br /> Stockton, California 95201 <br /> Subject: Closure Report for 20913 East Highway 12, Clements <br /> HLI 02803 <br /> . <br /> Dear' <br /> Ms T atte: <br /> The attached figure should resolve the questions.you had regarding the sampling that was <br /> conducted along the <br /> e western wall of the -excavation. 'Sample EX-3, collected at a depth <br /> of 13 feet-on 2 October .1992, ,had 1.3 mg/Kg of total petroleum hydrocarbons as gasoline <br /> and no detectable concentrations of benzene, toluene,.ethylbenz ene or xylenes. However, <br /> because hydrocarbons. were present in shallow soil above EX-3, as indicated by a <br /> concentration of total petroleuin hydrocarbons-as gasoline of 1,000 mg/Kg in sample EX-6 <br /> from a depth of'8 'feet,-'the hole was subsequently excavated to the limits shown for 4 <br /> .November 1992. <br /> When the excavation to remove contaminated soil was deemed complete, sample EX-10 was <br /> collected at a depth -of 8. feet from a portion of the sidewall that was within 6 feet <br /> (approximately) of sample EX-6.. Sampl6s EX-8.and 9 were also collected from this portion <br /> of the excavation to'determine if petroleilm hydrocarbons remained in the excavation <br /> . 8idewalls. Since no petroleum hydrocarbons were detected in these samples, .no further <br /> removal of soil from the excavation appears warranted. <br /> If you have any further questions, please do not hesitate to call us. <br /> Sincerely yours, <br /> HELMICK & LERNER INC" <br /> Noel M...Lerner, PZ. <br /> Project Manager <br /> attachments: Figure I Excavation Plan <br /> cc: Mr. Dan Barber,"Te idhert Land,Company <br /> W-CLEMENTS.CL1 <br />