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ENVIRONMENTAL HEALTH DEPARTMENT <br /> PSAN JOAQUIN COUNTY <br /> �o.-'��.coG Unit Supervisors <br /> Donna K.Heran,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Carl Borgman,R.E.H.S. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Mike Huggins, S.,R.D.I. <br /> Douglas W.Willsonson,,R.E.H.S. <br /> • c4., a`v Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> �iFoa Laurie A.Cotulla,R.E.H.S. <br /> Program Manager Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> g g Mark Barcellos,R.E.H.S. <br /> A R AND M E GLOVER <br /> FAYETTE MANUFACTURING CORPORATION MAR 11 x:004 <br /> P O BOX 61 <br /> TRACY CA 95378 <br /> RE: Fayette Manufacturing Corporation SITE CODE: 2233 <br /> 7675 Eleventh Street <br /> Tracy, California <br /> San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Workplan for Additional Subsurface Investigation at Fayette <br /> Manufacturing Site (WP), dated 04 March 2004, prepared by your consultant ATC <br /> Associates, Inc. (ATC). The WP addresses directives issued by EHD by letter <br /> dated 17 February 2004. <br /> ATC proposes in the WP to advance one cone penetrometer testing (CPT) boring <br /> in the former UST area to a total depth of 120 feet below surface grade to obtain a <br /> continuous lithological log and to identify permable, saturated intervals from which <br /> to obtain at least two hydropunch ground water samples and a soil sample for <br /> laboratory analysis. The data is needed to demonstrate the vertical extent of <br /> contaminants on the site in soil and ground water. <br /> In addition, three Geoprobe borings will be advanced between MW-4 and MW-5 to <br /> assess ground water in the sand commonly encountered between 15 and 25 feet <br /> below surface grade (bsg) on the site. Soil samples will be collected from each <br /> Geoprobe boring to characterize the hydrogeological framework; the ground water <br /> samples will be collected to assess for dissolved gasoline constituents. All grab <br /> ground water samples and selected soil samples will be analyzed for total <br /> petroleum hydrocarbons as jet fuel (TPH-j), TPH as gasoline (TPH-g), benzene, <br /> toluene, ethyl benzene, and total xylenes (BTEX) and fuel oxygenates. <br /> EHD approves the work plan, but recommends a target depth for the CPT boring <br /> of approximately 50 or 60 feet bsg. This is based on data from the 7500 W. 11th St. <br /> site, which appears to have a similar geological framework. In addition to having <br /> wells set in the shallow sand unit, the 7500 W. 11th Street site has wells set in a <br /> second sand interval from 25 to 31 feet bsg and in a third sand interval from 36 to <br /> 50 feet bsg. These sand units are separated by fine-grained units modeled to be <br /> approximately 5 feet thick. The deeper sand units have both tested non-detect for <br />