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r ENVIROAT IENTAL HEALTAEPARTMENT <br /> s° <br /> °°!" CIO SAN JOAQUIN COUNTY <br /> .L� <br /> v: 2� Unit Supervisors K. Heran, R.E.H.S. <br /> Director 304 East Weber Avenue,Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen, R.E.H.S. Stockton,California 95202-2708 Mike Huggins, R.E.H.S.,R.D.I. <br /> • oq.- N�v • Program ManagerTelephone: (209)468-3420 Douglas W.Wilson,R.E.H.S. <br /> /FOR Laurie A. Cotulla, 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 /> KEN GILLIES JAN 0 5 2006 <br /> GILLIES TRUCKING <br /> P O BOX 8303 <br /> STOCKTON CA 95208 <br /> RE: Gillies Trucking SITE CODE: 1703 <br /> 3931 Newton Road RO: 0264 <br /> Stockton, CA 95205 <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Third Quarter 2005 Report (QR), dated 25 November 2005, prepared by your <br /> consultant Upgradient Environmental Consultants (UEC). In the QR, UEC reports the <br /> analytical results of soil samples obtained from six additional soil borings installed to <br /> better characterize diesel contamination in soil between 35 and 70 feet below surface <br /> grade (bsg) in the known impacted soil area, an estimate of the contaminant mass in <br /> soil (sorbed), and the results of the third quarter groundwater monitoring event <br /> conducted on 06 October 2005. <br /> Twenty-three of the 32 soil samples submitted for laboratory analysis contained total <br /> petroleum hydrocarbons quantified as diesel (TPH-d) at concentrations as high as <br /> 20,200 milligrams per kilogram (mg/kg). UEC utilized these analytical results and the <br /> results from previous investigations, and/or averaged concentrations to establish TPH-d <br /> concentrations in each boring at 5-foot intervals. UEC mapped the concentration data <br /> for each 5-foot thick soil interval between 35 and 70 feet bsg. UEC then calculated an <br /> estimate of the contaminant soil mass. UEC estimated that 23,827 pounds or 3,350 <br /> gallons of diesel remain on site in soil between 35 feet and 70 feet bsg. <br /> EHD is concerned that the result is an underestimate as UEC applied contaminant <br /> concentrations expressed in units of mass to soil volumes to calculate the contaminant <br /> volume: <br /> V gas = Vsoil x [(K 35 feet + K 40 feet) + 2] x 1/1,000,000 x 7.48 gallon/ft3 <br /> Where V = volume, and K = contaminant concentration) <br /> EHD believes that since the contaminant concentrations are expressed in terms of <br /> mass (mg/kg) and since a given volume of soil has several times the mass of diesel, the <br /> soil mass, or weight (W), must be estimated and utilized to calculate the diesel mass. <br /> Undisturbed, compacted soil commonly weighs between 100 and 150 pounds per cubic <br />