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ENVIRONMENTAL HEALTH DEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Director Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> c � Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 4<;FOR� <br /> Laurie A.Corolla,R.E.H.S. Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> KEN GILLIES FEB 2 2005 <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 <br /> and reviewed Fourth Quarter 2004 Report (QR), dated 12 November 2004, <br /> prepared by your consultant Upgradient Environmental Consultants (UEC). The <br /> QR was received by the EHD 23 December 2004. In the QR, UEC reports the <br /> initial results obtained from installation. of seven additional groundwater <br /> monitoring wells in four soil borings installed to better characterize diesel <br /> contamination in soil and groundwater impacting one sand unit in the Modesto <br /> Formation and three successively deeper sand units in the Riverbank Formation. <br /> With the addition of the seven wells, there are currently one well (GT-10) <br /> completed in the Modesto sand aquifer, four wells (GT-5, GT-6, GT-9 and <br /> GT-13A) screened in the 151 Riverbank sand, five wells (GT-1, GT-3, GT-12, <br /> GT-14A and GT-15A) screened in the 2nd Riverbank sand, and three wells <br /> (GT-13B, GT-146, GT-156) screened in the 3rd Riverbank sand. Well GT-10 <br /> appears to fully penetrate the Modesto sand and aquitard and penetrate 2 feet <br /> into the 1st Riverbank sand. <br /> Total petroleum hydrocarbons as diesel (TPH-d) were detected in all four <br /> groundwater samples collected from the 1st Riverbank aquifer wells at <br /> concentrations ranging from 69 micrograms per liter (pg/I) to 620 pg/l; <br /> groundwater was inferred to be flowing toward the north, parallel to the east end <br /> of the inferred channel, but perpendicular to the west and central portions. The <br /> margin of the plume of impacted groundwater is not delineated in any direction. <br /> TPH-d was detected in groundwater samples collected from four of the five <br /> monitoring wells screened in the 2nd Riverbank, at concentrations ranging from <br /> 59 pg/I (MW12) to 600 llg/I (GT-15B), GT-14B contained a less than detectable <br /> concentration of TPH-d. Groundwater was inferred to have been flowing toward <br />