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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Carl Borgman,R.E.H.S. <br /> " :? Donna K.Heran,R.E.H.S. 304 East �Jel)eC �V0riU0, Tt11TCl FIOOC Mike Huggins,R.E.H.S.,R.D.I. <br /> < DirectorDouglas W.Wilson,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 <br /> P Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> • o .. Robert McClellon,R.E.H.S. <br /> Laurie A.Corolla,R.E.H.S. <br /> Fax: (209) 464-0138 Mark Baroellos,R.E.H.S. <br /> Program Manager <br /> NOV 2 6 2002 <br /> KEN GILLIES <br /> GILLIES TRUCKING <br /> p 0 BOX 8303 <br /> STOCKTON CA 95208 <br /> SITE CODE: 1703 <br /> RE: Gillies Trucking RO: 0264 <br /> 3931 Newton Road <br /> Stockton, CA 95205 <br /> On 13 November 2002, San Joaquin County Environmental Health Department <br /> (EHD) met with you and San Joaquin County Supervisor Dario Marenco at the <br /> EHD office to review the status of your site at the above address, and discuss <br /> remaining environmental concerns associated with the fuel hydrocarbon release <br /> on the site. Topics discussed at the meeting included EHD's view of the current <br /> state of the site assessment and the level of geologic, hydrologic and <br /> contaminant characterization required to proceed to a site closure. <br /> As noted at the meeting, sites contaminated primarily by diesel are not normally <br /> of as high a concern as those similarly impacted by gasoline or solvents, but in <br /> EHD's judgment, the unique setting of your site makes your diesel release a <br /> potential risk to ground water supplies. Your site is in ana e havingntified abundant <br /> subsurface sand units and 30 or more pumping <br /> your <br /> consultant, Upgradient Environmental Consultants (UEC), as being within a <br /> 2,000-foot radius of the release. Information regarding the construction of most Of <br /> the wells was reported as being unavailable, but some are believed screnedt to <br /> total depths of 150 to 200 feet below surface grade (bsg), potentially i <br /> zone of impacted ground water. To consider the site for possible closure, <br /> continued quarterly monitoring, or for remedial action, EHD must have sufficient <br /> information to be able to evaluate the risk posed by the release to the local <br /> ground water supplies. EHD did not find the following information during review <br /> of the available data: <br /> • An estimate of the masses of sorbed and dissolved hydrocarbons; <br /> • The vertical extent of impacted ground water; <br /> • Horizontal delineation of the extent of impacted ground water in each of <br /> the three depth intervals currently monitored; <br /> • Hydraulic properties of the sand bodies <br />