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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 />March 17, 2008 <br />Mr. Donald Helsel <br />Earthgrains Baking Companies, Incorporated <br />2651 South Airport Way <br />Stockton, California 95206 <br />Subject: Earthgrains Baking Companies, Incorporated <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 Bergman, REHS <br />Mike Huggins, REHS, RDI <br />Margaret Lagono, REHS <br />Robert McClellon, REHS <br />Jeff Carruesco, REHS, RDI <br />Kasey Foley, REHS <br />The San Joaquin County Environmental Health Department (EHD) has reviewed <br />Clarification and Addendum — Site Conceptual Model and Work Plan for Remedial <br />Investigation (Addendum), dated January 24, 2008, prepared by Philip Environmental <br />Services Corporation (PSC) on your behalf for the above -referenced site. The Addendum <br />follows recommendations presented by PSC and their subcontractor ETIC Engineering, <br />Incorporated (ET1C) during a telephone conversation with the EHD on January 10, 2008, in <br />response to comments and recommendations presented by the EHD by letter dated December <br />3, 2007. <br />PSC proposes to advance four cone penetration test (CPT) borings to depths of <br />approximately 100 feet below surface grade (bsg) at locations presented on the revised <br />Figure 10 of the Addendum. Instead of using sensors associated with CPT technology, PSC <br />proposes to use a membrane interface probe (MIP) coupled with the conductivity sensor to: <br />• Identify depths that are impacted with hydrocarbons using a mobile gas chromatograph <br />with three detectors (electron capture, photo ionization, and flame ionization); and <br />Measure soil conductivity to profile the relative permeability of the subsurface and aid <br />in the assessment of soil lithology. <br />Data generated will be used to identify and collect depth -discreet grab groundwater samples <br />at approximately 60, 70, 80, 90, and 100 feet bsg from five individual boreholes advanced <br />adjacent to each CPT boring. <br />