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47 <br /> San Joaquin County DrRE <br /> Donnnaa Heran,REHS <br /> o , . Environmental Health Department AssrsrANTDIRECTOR <br /> :'' •OG Street Laurie Cotulla,REHS <br /> 600 East Main <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Carl Borgman,RENS <br /> r: Mike Huggins,REHS, RDI <br /> Website: i+vww.sjgov.org/ehd Margaret Lagorio, REHS <br /> �rr<O Phone: (R 209) 468_3420 Robert McClellon,REHS <br /> Jeff Carruesco,REHS, RDI <br /> Fax: (209) 464-0138 Kasey Foley,REHS <br /> March 18, 2009 <br /> i Mr. Matt Gabris <br /> Sara Lee Bakery Group Inc <br /> 3500 Lacey Road <br /> Downers Grove Illinois 60515=5424 <br /> Subject: Earth Grains/formerly Kilpatrick Bakery RO#: 0110 <br /> 1717 S. Center St. CUF#:04423 <br /> Stockton, CA 95201 APN: 165-072-28 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> I Remedial Investigation and Well Installation Report (Report) dated February 9, 2009 <br /> submitted by your consultant, PSC. The Report details the installation of four <br /> j groundwater monitoring wells, MW-2A, MW-3A, MW-5 and MW-5A in April and May <br /> 2008. This phase of work had been directed by the EHD by correspondence dated <br /> ` August 1, 2007. <br /> Groundwater samples were collected from.the new monitoring wells on May 5, July 7, <br /> and October 28, 2008. Groundwater samples from MW-3A and MW-5 have been non- <br /> detect for the contaminants of concern (COCs), including total petroleum hydrocarbons <br /> quantified as gasoline (TPHg), benzene, toluene, ethylbenzene, and total xylenes <br /> I (BTEX), and the fuel oxygenates for all three monitoring events while MW-2A and <br /> t MW-5A groundwater samples have contained elevated levels of various CDCs. <br /> Conclusions in the Report indicate that your consultant understands that the next step at <br /> the site is preparation of a Feasibility Study/Remedial Evaluation (FS/RE) and Corrective <br /> Action Plan (CAP), but that "moving forward with the FS/RE is not prudent"due to the <br /> potential of an off-site source of petroleum hydrocarbons from an "apparent abandoned <br /> UST(underground storage tank) or orphan site north of the site': <br /> I The EHD's evaluation of your site indicates that a substantial source of COCs remains <br /> on your site in the subsurface near MW-2 as shown �by the analytical data for soil <br /> l samples collected from C-1 between 20 feet and 40 feet below surface grade (' bsg). At <br /> the northern edge of the site, eleven soil samples were collected from the borehole for <br /> the deep monitoring well, MW-5A, starting at 26' bgs and continued at approximately <br /> five-foot intervals to 66' bgs and were submitted for laboratory analysis. Only the soil <br /> sample from the 41-42' bgs interval contained detectable concentrations of TPHg (10 <br /> mg/kg). <br /> i <br /> I Ground water samples collected from the newly installed shallow MW-5 did not contain <br /> detectable concentrations of hydrocarbon fuel constituents during any of the three 2008 <br /> sampling Events. This well is the closest shallow well to the 'potential off-site source' <br /> identified by your consultant; intuitively, soil and groundwater from a shallow well near a <br /> significant source should be intensely impacted, but this shallow well is not, whereas <br /> -18-09 <br /> 1717 Center MWi report CML 3 <br />