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FILE COPY <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> oPaF�'� SAN JOAQUIN COUNTY <br /> �.,•pG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director <br /> - Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins, son,R.R.D.I. <br /> . Douglas W.Willson,R.E.H.S. <br /> • cq• :��P• Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E. <br /> � Foa Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark.Barcellos,R.E.H.S. <br /> Lorre Islas / James Rinehart APR 2 0 2004 <br /> City of Stockton . <br /> 425 North El Dorado, Room 301 <br /> Stockton, CA 95202 <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 Soil 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 remediated 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 /> DATED April 20,2004 BY <br /> C'. ' <br /> C: Treadwell& Rollo— David Dixon,RG 1 0 V7 - F <br /> C: RWQCB, Central Valley Region—James L. L. Barton, RG <br /> C: Department of Toxic Substance Control—Jerry Lile <br />