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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> OP C <br /> iUnit Supervisors <br /> v i Donna K Heran,R E H S Carl Borman,R E H S <br /> Director 304 East Weber Avenue, Third Floor g <br /> Mike Huggins,R E H$, R D 1 <br /> Al Olsen,R E H S Stockton, California 95202-2708 Douglas W Wilson,R E H S <br /> CQ Nie Program Manager Telephone (209) 468-3420 Margaret Lagono,R E V <br /> t rF o� Laurie A Cotulia,R E H S <br /> Pro ram Manager Fax (209) 464-0138 Robert McClellan,R E S <br /> M <br /> ' � g Mark Barcellos,R E H S <br /> Lorre Islas / James Ra.nehart APR 2 0 2004 <br /> City of Stockton <br /> 425 North El Dorado, Room 301 RECEIVED <br /> ' Stockton, CA 95202 <br /> APR 2 s 204' <br /> RE CARANDO MACHINE WORKS ! . . <br /> 420 NORTH MADISON <br /> STOCKTON, CA 95202 <br /> ' San Joaquin County Environmental Health Department (EHD)had previously disapproved <br /> the use of Oxygen Reducing Compound (ORC) as proposed in Sod and Groundwater <br /> Investigation Report and Remedial Workplan dated April 12,2004 prepared by Treadwell& Rollo <br /> The quantity of ORC proposed was considered excessive (approximately 4,500 pounds of <br /> ORC at a cost of about$10/pound) and its cost-benefit could not be justified In a telephone <br /> conversation with Treadwell and Rollo on April 19,2004, EHD agrees to the placement of <br /> ORC at quantity not over 500 pounds (Please also see fax memorandum dated April 20, <br /> 2004 from Treadwell &Rollo) Although no site with similar geology in San Joaquin County <br /> has been remedtated and successfully closed by the use of ORC, EHD agrees that there is <br /> ' potential benefit in the remediation of the remaining impacted soil and groundwater below <br /> the bottom of proposed excavation EHD requests that the ORC be mixed into a slurry <br /> before placing into the bottom of the excavation at locations where contamination is noted, <br /> ' instead of being mixed with the pea gravel backfill material <br /> ' <br /> DATED Aril 20 2004 BY44 C, <br /> ' C Treadwell &Rollo— David Dixon, RG <br /> C RWQCB, Central Valley Region —James L L Barton,RG <br /> C Department of Toxic Substance Control—Jerry Lile <br /> 1 <br /> 1 <br />