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9 <br /> ENVIROP&ENTAL HEALTHODEPARTMENT <br /> SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> c. .a Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> w. � Director <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins,R.E.H.S,R.D.I. <br /> Douglas W.Wilson,R.E.H.S <br /> • 9 FOQ `P• Program Manager Tele hone: (209) 468-3420 MargazetLagorio,R.E.H.S. <br /> Laurie oA.g Catalan,R.E.H.S. P Robert McClellon,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> KEN GILLIES JUN 0 9 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 First Quarter 2005 Report (QR), dated 08 April 2005, prepared by <br /> your consultant Upgradient Environmental Consultants (UEC). The QR was <br /> received by the EHD on 05 May 2005. <br /> In the QR, UEC recommended deferring installation of monitoring well GT-19 <br /> until additional monitoring data had been acquired to optimize situating the well. <br /> The EHD concurs with this recommendation. <br /> UEC also proposed to install six additional soil borings (and a possible seventh <br /> east of GT-21) to collect soil samples from the Modesto Formation to develop an <br /> updated estimate of the mass of the total petroleum hydrocarbons as diesel <br /> (TPH-d) in the Modesto. The mass and distribution of the TPH-d is needed to <br /> model potential leaching of the TPH-d into groundwater when the groundwater <br /> elevation increases and groundwater is again in contact with the impacted soil. It <br /> was proposed to collect soil samples for laboratory analysis at 5-foot intervals <br /> between 35 and 60 feet below surface grade (bsg). Selected samples may be <br /> analyzed for TPH-gasoline and for benzene, toluene, ethylbenzene, and total <br /> xylenes (BTEX). <br /> As the Modesto Formation is within the known range of groundwater elevation <br /> fluctuation and is known to be the more intensely impacted soil on the site, and <br /> your site is located in an area of high groundwater usage (over 30 wells within a <br /> 2,000-foot radius), the EHD considers this to be an appropriate and necessary <br /> action to evaluate the risk posed by eventual closure of your site while leaving <br /> impacted soil in place. The proposed scope of work is approved. <br /> If your last drilling permit is still current and you will be utilizing the same drilling <br /> contractor, you may not need to apply for a new permit. If the last permit will be <br /> over a year old at the time of drilling or you do change drilling contractors, please <br />