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ENVIRONN IENTAL HEALTH DEPARTMENT <br /> Pp U,lly SAN JOAQUIN COUNTY <br /> Program Coordinators <br /> Donna K. Heran, R.E.H.S. 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Director <br /> rnia 95202-2708 Mike Huggins, R.E.H.S.,R.D.I. <br /> Laurie A. Cotulla,R.E.H.S. Stockton,Califo <br /> Margaret Lagorio, R.E.H.S. <br /> cy�iFORN•P Assistant Director Telephone: (209)468-3420 Robert McClellon,R.E.H.S. <br /> Fax: (209)464-0138 Jeff Carruesco,R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Kasey Foley, R.E.H.S. <br /> 21 ti)I4-1 4djrt2 . <br /> JOHN & MARGARET 1 ARCI �,� i rk r'7-rt' °� r=>? o 9 2007 <br /> 6816 STABIS ROAD <br /> VALLEY SPRI GS CA 95252 <br /> RE: John and Margaret Marci Property SITE CODE: 2015 <br /> 2969--Loomis Road <br /> Stockton,California 95205 <br /> San Joaquin County Environmental Health Department (EHD) has received and reviewed Work <br /> Plan - Bioventing with Biosparing Pilot Test dated June 9, 2006, prepared and submitted by <br /> Geological Technics Inc. (GTI) on your behalf. In this work plan GTI proposes to perform a pilot <br /> test to evaluate the effects of combining biosparging with bioventing as a means to reduce diesel <br /> petroleum hydrocarbon contamination at the above-referenced site. In conjunction with performing <br /> the biosparing/bioventing pilot test, GTI also proposes to perform a dual phase soil vapor extraction <br /> and groundwater extraction pilot test to evaluate the effects of high vacuum vapor extraction to <br /> remove diesel contamination and possibly prevent the spread of petroleum hydrocarbon <br /> contamination that could result from biosparging/bioventing. <br /> EHD approves the above-referenced work plan as submitted for performing the pilot tests. Please <br /> submit a well permit application and permit/inspection fee of$374 to EHD for the installation of <br /> injection wells IW-1 with a screening interval between 42 and 44 feet below surface grade (bsg) <br /> and IW-101 with a screening interval between 55 and 57 feet bsg; installation of extraction wells <br /> EW-1, EW-2, and EW-3, each with a screening interval between 42 and 44 feet bsg, and EW-101, <br /> EW-102, and EW-103, each with a screening interval between 55 and 57 feet bsg; and installation <br /> of one deep sparing well AS-1 with a ceramic diffuser set at 70 to 72 feet bsg. <br /> If you have any questions,please contact Vicki McCartney at(209)468-3456 or by electronic mail <br /> at vmccartney0)sjcehd.com. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department <br /> Victoria L. Mc ey, Senio4REHS Nuel C. Henderson Jr. PG <br /> Unit IV-Site Mitigation Engineering Geologist <br /> Unit IV-Site Mitigation <br /> c: James L.L.Barton,PG—CVRWQCB <br /> Raynold I.Kablanow 1I,Ph.D., PG—GTI <br />