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ENVIRON MENTAL HEALTHI)EPARTMENT <br /> O <br /> . SAN JOAQUIN COUNTY <br /> •. <br /> Donna K. Heran, R.E.H.S. Unit Supervisors <br /> " X Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> AI Olsen, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S., R.D.I. <br /> �9� FOP '`P• Program Manager Telephone: (209)468-3420 Douglas W. Wilson, R.E.H.S. <br /> Laurie A. Colons, R.E.H.S. Margaret Lagorio,R.E.H.S. <br /> Program Manager Fax: (209)464-0138 Robert McClellon, R.E.H.S. <br /> Website:www.sjgov.org/ehd/ Jeff Carruesco, R.E.H.S. <br /> D CHARLES SKOBRAK OCT 2 eJ 2005 <br /> 9947 EAST HIGHWAY 26 <br /> STOCKTON CA 95215 <br /> RE: Larry's Auto SITE CODE 1122 <br /> 308 North Grant Street RO: 194 <br /> Stockton,CA 95202 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan Addendum <br /> dated September 29, 2005, prepared by Advanced GeoEnvironmental, Inc. (AGE) for the above- <br /> referenced site. This addendum addresses EHD's recommendation for the installation of a second <br /> extraction well adjacent to the extraction well approved by letter dated December 29, 2004, for <br /> interim remediation at this site. <br /> EHD approves the installation of a second extraction well (EW-2) to be located within ten feet of <br /> the previously approved extraction well (EW-1) and a groundwater aquifer extraction pump test for <br /> EW-2 to obtain maximum coordination between the two extraction wells. EW-2 will be advanced <br /> to a total depth of 73 feet below surface grade (bsg) with a screen interval approximately 58:to 73 <br /> feet bsg. Both soil borings (EW-1 and EW-2) will be continuously cored through the zones of <br /> lithologic interest for proper screen placements. <br /> In Quarterly Report — Second Quarter 2005 dated September 30, 2005, AGE recommends the <br /> reduction in reporting the full scan of compounds by Environmental Protection Agency SW-846 <br /> Method 8260B. EHD approves the reduction in reporting the full scan of Method 8260B <br /> compounds; however, because naphthalene, 1,2,4-trimethybenzene, and 1,3,5-trimethylbenzene are <br /> reported at high concentrations, EHD directs that the full scan of Method 8260B compounds be <br /> reported semiannually instead of quarterly. <br /> Please submit a drilling permit application along with a $368.00 permit fee for the installation of <br /> the two extraction wells to EHD by November 10, 2005. EHD is extending the deadline for the <br /> installation of these two extraction wells from October 28, 2005, to November 30, 2005, and the <br /> completion of the extraction pilot tests from November 30,2005,to December 30, 2005. <br /> If you have any questions, please contact Vicki McCartney at (209) 468-3456 or by email at <br /> vmccartney@sjcehd.com. <br /> Donna Heran,REHS,Director <br /> Environmental Health Department01 <br /> Victoria L. McCartney, Senior REHS Nuel C. Henderson,Jr.,PG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> c: Daniel W.Kalmbach-AGE <br /> James L.L.Barton,PG-CVRWQCB <br />