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,n. <br />v <br />M <br />San Joaquin County <br />Environmental Health Department <br />600 East Main Street <br />Stockton, California 95202-3029 <br />Website: www.sjgov.org/ehd <br />Phone: (209) 468-3420 <br />Fax: (209) 464-0138 <br />DON HELSEL <br />EARTHGRAINS BAKING COMPANIES INC <br />2651 SOUTH AIRPORT WAY <br />STOCKTON CA 95206 <br />RE: Earthgrains Baking Companies, Inc. <br />2651 South Airport Way <br />Stockton, California 95206 <br />DIRECTOR <br />Donna Heran, REHS <br />ASSISTANT DIRECTOR <br />Laurie Cotulla, REHS <br />PROGRAM COORDINATORS <br />Carl Borgman, REHS <br />Mike Huggins, RENS, RDI <br />Margaret Lagorio, REHS <br />Robert McClellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Kasey Foley, REHS <br />DCCo320 <br />SITE CODE: 19093 <br />RO: 0431 <br />San Joaquin County Environmental Health Department (EHD) has reviewed Site <br />Conceptual Model and Work Plan for Remedial Investigation dated September 13, 2007, <br />prepared and submitted by ETIC Engineering, Inc. (ETIC) for PSC Environmental <br />Services (PSC) on your behalf. EHD concurs with recommendations presented in the <br />work plan to advance four cone penetrometer test (CPT) borings to depths of <br />approximately 100 feet below ground surface (bgs) to generate continuous logs of <br />computer -interpreted soil types to aid identification of approximately five optimal <br />locations between 50 and 100 feet bgs to collect depth -discrete grab groundwater samples <br />from individual borings advanced adjacent to each CPT borehole. <br />ETIC proposes to advance CPT -4 approximately twelve feet west-northwest of borehole <br />H13; and in addition to collecting grab groundwater samples, ETIC proposes to collect <br />one soil sample at approximately 23 feet bgs to laterally delineate hydrocarbon <br />contamination south of the former gasoline underground storage tank (UST) excavation. <br />Noting that soil samples collected from H13 at five-foot intervals to total depth of fifty- <br />five feet bgs were nondetect for chemicals of concern (COC), EHD recommends CPT -4 <br />be relocated just south of the storm sewer pipeline and in line with boreholes H10 and <br />H11, the two boreholes where COC were detected at high concentrations at 23 feet bgs. <br />ETIC proposes to advance CPT -5 at the eastern edge of the former gasoline UST <br />excavation about two feet east of borehole 2B. EHD believes CPT -5 would be better <br />located halfway between boreholes 2A and 213, approximately in the center of the former <br />UST pit, and closer to borehole H9 where high concentrations of COC were detected in <br />groundwater samples and soil samples collected at 54 feet bgs in November 2006. In <br />addition to collecting grab groundwater samples, soil samples should be collected to <br />vertically delineate hydrocarbon contamination at the source area. <br />ETIC proposes to advance CPT -6 approximately three feet west of borehole H1; and in <br />addition to collecting grab groundwater samples, ETIC proposes to collect two soil <br />