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^ San Joaquin County • DIRECTOR <br /> oPq WIV cDonna Heran,REHS <br /> o� Environmental Health Department ASSISTANT DIRECTOR <br /> r. <br /> :e 600 East Main Street <br /> Laurie Cotulla,REHS <br /> _ Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> _- Cad Borgman,REHS <br /> Cq �Fo...... Mike Huggins, REHS,RDI <br /> Website: www.sjgov.org/ehd Margaret Lagono,REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 Jeff Carruesco, REHS, RDI <br /> Kasey Foley,REHS <br /> KEN GILLIES JUN 0 6 2007 <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 Fourth Quarter 2006 Report(4"' QR '06) and First Quarter 2007 Report (1" QR <br /> '07), both prepared by Upgradient Environmental Consultants (UEC), your consultant for <br /> the above-referenced site. <br /> In 4`h QR '06, UEC reported the findings from installing two soil borings and five <br /> monitoring wells on your site to further characterize the site hydrogeology and impacted <br /> soil and groundwater. Also reported were the results of leaching tests performed on soil <br /> samples collected from the two borings to evaluate the potential for future impact to <br /> groundwater should groundwater again come into contact with the remaining impacted <br /> vadose zone soil. <br /> The new monitoring wells were screened in the first Riverbank sand (Vt Riverbank) to <br /> assess the lateral extent of impacted groundwater potentially migrating through the sand <br /> that has been inferred to have been deposited in a former stream channel. Total <br /> petroleum hydrocarbons quantified as diesel (TPH-d) were not detected in water <br /> samples collected from the more easterly wells, but were detected in MW-30 toward the <br /> southeast. <br /> The leaching test had been proposed and designed to evaluate the leaching potential <br /> from diesel-impacted soil of the Modesto Formation by utilizing impacted soil collected <br /> from the Modesto Formation in the two soil borings (GT-28 and GT-29). As impacted soil <br /> samples were not encountered in the two borings, selected soil samples were spiked <br /> with diesel to conduct the leaching/sorption test. As a result of one leaching run (each <br /> consisting of immersion in groundwater from the site for 72 hours) approximately 72 to <br /> 89 % of the diesel in the soil apparently was removed; by the fourth leaching test TPH-d <br /> was reduced to undetectable concentrations in the soil samples. Apparently the diesel in <br /> soil desorbed and went into solution. The impacted groundwater was then brought into <br /> contact with dried site soil samples to evaluate the sorption capacity of the Riverbank <br /> soil for the TPH-d. Each test run progressively 'cleaned' up the groundwater impacted by <br /> the previous leaching test run until the groundwater samples had very low or non- <br /> detectable concentrations of diesel. From this, UCE seems to imply that impacted soil in <br />