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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> g <br /> Donna K.Heran,R.E.H.S. Carl Bor man,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor <br /> Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> :., _ �:• Douglas W.Wilson,R.E.H.S. <br /> • �•: �P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4 . ..w <br /> +�oR <br /> . Laurie A.Cotulla,R.E.H.S. Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 <br /> Mark Barcellos,R.E.H.S. <br /> FREDERICK CLARK JAN a 5 2004 <br /> CITY OF MANTECA <br /> 1001 W CENTER STREET <br /> MANTECA CA 95336 <br /> I� <br /> f <br /> -RE-: MantecaCity Corporation-Yard- 4 _ —SITE COnE:-0690F <br /> 210 E. Wetmore Street <br /> Manteca CA 95336 <br /> San Joaquin County Environmental Health Department (SJCIEHD) has reviewed <br /> 'Corrective Action Plan" (CAP) dated November 7, 2003 that was prepared on your <br /> behalf by Advanced GeoEnvironmental, Inc. (AGI ) and has the following comments. <br /> The CAP presents a brief history of the investigation of the unauthorized release of <br /> petroleum hydrocarbons that has taken place following the 1999 removal of three <br /> underground storage tanks at this site. Most of the contamination at this site is in the <br /> groundwater in the vicinity of monitoring well MW�4, and down gradient from MW4, to <br /> depths of approximately 30 feet below surface grade (bsg). The CAP compares <br /> groundwater pump and treat with insitu ozone injection for their potential to remediate <br /> this contamination, and for their cost effectiveness. AGE recommends ozone injection <br /> as the most efficient and cost effective remedial alternative, and proposes to conduct a <br /> six-month ozone injection pilot test. <br /> Please submit a work plan for design, installation and startup of an ozone injection <br /> remediation system at this site. Include in the work plan an estimate of contaminant <br /> mass remaining at this site, in both soil and groundwater. The work plan is due for <br /> _ submittal no-later,than-.March.5,-2004., , - -- <br /> If <br /> If you have any questions please call Lori Duncan at (209) 468-0337. <br /> Donna Heran, REHS, Director <br /> Environmental Health Department <br /> Lori Duncan, Senior REHS Nuel C. Henderson, Jr., RG <br /> LOP/Site Mitigation Unit IV LOP/Site Mitigation Unit IV <br /> cc: James Barton, CVRWQCB <br /> Brian Millman, AGE <br />