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ENVIRONMENTAL HEALTH DEPARTMENT
<br />SAN JOAQUIN COUNTY
<br />Donna KDirecto, R.E.H.S. SAN
<br />East Weber Avenue, Third Floor
<br />Laurie A. cornua, R.E.H.S. Stockton, California 95202-2708
<br />Assistant Director Telephone: (209) 468-3420
<br />Fax: (209) 464-0138
<br />Website: www.sjgov.org/ehd/
<br />DON HELSEL
<br />EARTHGRAINS BAKING COMPANIES INC
<br />2651 SOUTH AIRPORT WAY
<br />STOCKTON CA 95206
<br />RE: Earthgrains Baking Company Facility
<br />2651 South Airport Way
<br />Stockton, California 95206
<br />Program Coordinators
<br />Carl Borgman, R.E.H.S.
<br />Mike Huggins, R.E.H.S., R.D.I.
<br />Margaret Lagorio, R.E.H.S.
<br />Robert McClellon, R.E.H.S.
<br />Jeff Carruesco, R.E.H.S.
<br />Kasey Foley, R.E.H.S.
<br />OCT 12 2006
<br />SITE CODE: 19093
<br />RO: 0431
<br />San Joaquin County Environmental Health Department (EHD) has reviewed Work Plan
<br />for Soil and Groundwater Quality Investigation dated August 2006 prepared and
<br />submitted by ETIC Engineering, Inc. (ETIC) for PSC Environmental Services (PSC) on
<br />your behalf. EHD concurs with recommendations presented in the work plan to advance
<br />15 soil borings using a direct -push drilling rig to investigate sources of residual
<br />petroleum hydrocarbon contamination, and to further characterize petroleum hydrocarbon
<br />contamination in soil and groundwater near two existing oil/water separator systems,
<br />three former underground storage tanks (UST), a former dispenser island, and points
<br />cross gradient and down gradient of this source area.
<br />Although disparities exist between paragraphs two and six in Section 3.1 and Table 3 of
<br />the work plan, EHD assumes the following soil sampling schedule will be implemented.
<br />• Borings H1, H2, H3, and H4, advanced to total depths of 25 feet below ground
<br />surface (bgs) at both ends of two existing oil/water separators, will have soil
<br />samples collected at 5, 10, 15, 20, and 25 feet bgs for analysis.
<br />• Boring H5, advanced to total depth of 20 feet bgs adjacent to cone penetrometer
<br />test (CPT) boring C at the former 10;000 -gallon diesel UST location, will have
<br />soil samples collected at 10, 15, and 20 feet bgs for analysis.
<br />• Boring H6, advanced to total depth of 25 feet bgs adjacent to the storm water
<br />pipeline, will have soil samples collected at 5, 10, 15, 20, and 25 feet bgs for
<br />analysis.
<br />• Boring H7, advanced to total depth of 55 feet bgs adjacent to CPT -B at the former
<br />dispenser island site, will have soil samples collected at 5, 8, 15, 40, 45, 50, and
<br />55 feet bgs for analysis.
<br />• Borings H8, H9, H11, and H12, advanced to total depths of 55 feet bgs at both
<br />ends and both sides of the former excavation for the two 6,000 -gallon gasoline
<br />USTs, will have soil samples collected at 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, and
<br />55 feet bgs for analysis.
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