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r <br /> San Joaquin County DIRECTOR <br /> Donna Heran, REHS <br /> Environmental Health Department ASSISTANT DIRECTOR <br /> �. °4 Laurie Cotulla,REHS <br /> 600 East Main Street <br /> Stockton, California 95202-3029 <br /> ` PROGRAM COORDINATORS <br /> Carl Borgman,REHS <br /> Mike Huggins,REHS,RDI <br /> C Website: www.sjgov.org/ehd Margaret Lagorio, REHS <br /> qCl FORS Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209)464-0138 Jeff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> MATT GABRIS AUG 01 2007 <br /> SARA LEE BAKERY GROUP INC <br /> 3500 LACEY ROAD <br /> DOWNERS GROVE ILLINOIS 60515-5424 <br /> RE: Earth Grains/formerly Kilpatrick Bakery RO#: 0000110 <br /> 1717 S. Center St. Clean Up Claim #4423 <br /> Stockton, CA 95201 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Post Remediation Subsurface Investigation Report (Report) dated April 4, 2007 <br /> and has the following comments. <br /> The Report details the placement of five soil vapor points, SV1-A, SV2-B, and <br /> SV2 thru SV4 and four confirmation soil borings. This phase was required for a <br /> no further action consideration and the plan was approved by the EHD in <br /> correspondence dated October 11, 2006. <br /> The soil vapor probes were installed and sampled per Department of Toxic <br /> Substances Control (DTSC) protocol. The laboratory results indicated none of <br /> the soil vapor samples collected and analyzed exceeded Environmental <br /> Screening Levels (ESL) established for Total Petroleum Hydrocarbons as <br /> gasoline (TPHg), benzene, toluene, ethyl benzene, and xylene (BTEX) or the <br /> only fuel oxygenate detected, Tert-butyl alcohol (TBA). <br /> The confirmation soil borings, C-1 thru C-4, were installed on November 28 and <br /> 29, 2006 and placed in areas where previous soil concentration data indicated <br /> elevated levels of petroleum were present prior to the enactment of the remedial <br /> action, soil vapor extraction (SVE). A fifth boring, C-5 was not advanced due to <br /> subsurface conditions that indicated a utility trench was present. <br /> Soil samples from the confirmation borings were collected and analyzed every <br /> four vertical feet to either 50 or 55 feet below ground surface (`bgs). Some <br /> contamination remains in the soil from 20 to 53 feet below surface grade (`bsg). <br /> Grab ground water samples collected from 50' bsg have petroleum <br /> contamination. The existing monitoring wells are screened to depths of 35' and <br /> 40' bsg. The current network of monitoring wells do not provide for investigation <br /> of the ground water at 50' bsg. The vertical extent of the ground water <br /> contamination must be determined and additional monitoring wells are to be <br /> installed. <br />