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} <br /> p <br /> San:Joaquin County <br /> Environmental Health Department DIRECTOR <br /> RC1 Donna Heran, REHS <br /> s., ? 600 East Main Street <br /> PROGRAM COORDINATORS <br /> i Stockton, California 95202-3029 Robert McClellon, REHS <br /> •,,- --"-- ;'•' Jeff Carruesco,REHS, RDI <br /> C1. - :?\p Kasey Foley, REHS <br /> g l F O R Website: www.sjgov.Org/ehd Linda Turkatte, REHS <br /> Phone: (209)468-3420 <br /> Fax: (209) 464-0138 <br /> December 28, 2011 <br /> Mrs. Margaret A. Marci <br /> 20 Mobile Lane <br /> Crescent City, California 95531-8409 <br /> Subject: Marci Property <br /> 2969 Loomis Road <br /> Stockton, California 95205 <br /> Dear Mrs. Marci: <br /> Since March 2009, the State Water Resources Control Board (SWRCB) Cleanup Fund (CUF) <br /> has recommended that the San Joaquin County Environmental Health Department (EHD) <br /> consider the above-referenced site for closure. In the most recent annual five-year review <br /> update letter dated 08 December 2011, the CUF continues,to recommend that the EHD <br /> review this site for closure. In light of this, the EHD has reviewed and evaluated the data <br /> presented in Report of Findings (report), dated 31 August 2011, prepared and submitted by <br /> your consulting firm, Geological Technics Inc. (GTI). <br /> In the report, GTI listed eleven domestic wells, two monitoring wells, one public well and one <br /> unidentified well within 2,000 feet of this site. Of these, three water supply wells located within <br /> 600 feet of the source area were sampled in June 2011 and the groundwater results were <br /> non-detect for contaminants of concern. <br /> GTI also oversaw the advancement of four cone penetrometer testing (CPT) borings to <br /> approximately 100 feet below surface grade (bsg) for subsurface Iithologic evaluation. This <br /> was followed by the advancement of five soil borings adjacent to the CPT borings and the <br /> collection of grab groundwater samples at discrete depth intervals. Concentrations of total <br /> petroleum hydrocarbons as diesel (TPH-d), the contaminant of concern, were detected in four <br /> of the five borings at depths between 60 and 94 feet bsg and at concentrations as high as <br /> 4,140 micrograms per liter (dig%L). GTI concluded that "due to the nature of diesel to not <br /> migrate a great distance from its source, the residual diesel does not pose a threat to the <br /> public health." <br /> GTI reported that analytical results for groundwater collected from the five most impacted <br /> monitoring wells suggests a decreasing trend in concentrations of TPH-d; however, GTI noted. <br /> that there appears to be an inverse relationship between groundwater elevations and TPH-d <br /> concentrations detected in the monitoring wells at this site. Since December 2005, when <br /> groundwater levels began to rise, TPH-d concentrations have decreased over time. <br /> I <br />