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�� an/ <br /> San Joaquin County DIRECTOR <br /> Donna Hera <br /> ASSISTANT Department DIRECTECT <br /> OR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 <br /> y - PROGRAM COORDINATORS <br /> •' t Carl Borgman,REHS <br /> p Mike Huggins,REHS, RDI <br /> c Website: www.s ov.or /ehd <br /> �g g Margaret Lagorio,REHS <br /> Phone: (209)468-3420 Robert McClellon,REHS <br /> Fax: (209) 464-0138 .teff Carruesco,REHS,RDf <br /> Kasey Foley,REHS <br /> A R AND M E GLOVER JUL 16 2007 <br /> FAYETTE MANUFACTURING CORPORATION <br /> P O BOX 61 <br /> TRACY CA 95378 <br /> RE: Fayette Manufacturing Corporation <br /> 7675 Eleventh Street <br /> Tracy, California <br /> The San Joaquin County Environmental Health Department (EHD) has received and <br /> reviewed Work Plan for Additional Subsurface Investigation, Soil Vapor Study, and <br /> Modeling at Fayette Manufacturing Site (WP) dated 09 July 2007, prepared by your <br /> consultant ATC Associates, Inc. (ATC) for the above referenced site. The WP was <br /> prepared in response to recommendations in the EHD letter of 29 August 2006 to collect <br /> current soil analytical data in areas of highest known contaminant impact from the <br /> unauthorized release from your former underground storage tank (UST) system; obtain <br /> soil gas data to evaluate the potential for vapor intrusion into the structure on your site and <br /> to propose remedial alternatives for your site. The latter recommendation was not <br /> addressed in this WP and may more appropriately be addressed after the results of the <br /> proposed investigation have been obtained and evaluated. <br /> In the WP, ATC proposed to advance six soil borings to collect soil and groundwater <br /> samples and two vapor probe borings to collect soil vapor samples. Three of the proposed <br /> soil-boring locations are in the former UST area and the other three are approximately 60 <br /> to 110 feet in the general down-gradient direction. The locations for the three proposed <br /> vapor borings are near monitoring well MW-3 and near the building between soil boring <br /> SB-7 and the former UST #1 location. The EHD approves the vapor probes, but <br /> recommends that the proposed vapor points be advanced between the former UST pits <br /> and the building; such locations will simultaneously evaluate the source areas and vapor <br /> near the building. <br /> The three soil borings in the former UST areas are approved for soil sampling, but the <br /> EHD does not believe groundwater sampling from the borings is necessary as the <br /> proposed locations are near MW-2 and MW-3. At this time the EHD is satisfied with the <br /> characterization of impacted groundwater and does not approve additional groundwater <br /> sampling unless ATC provides a technical reason for collecting the data. The EHD also <br /> approves the proposed GP-7 location, but believes impacted soil detected northwest of <br /> that point represents capillary fringe contamination; the EHD approves advancement of <br /> the proposed GP-8 and GP-9 if in the professional opinion of the responsible professional <br /> geologist or engineer in charge the field indications in soil samples collected from GP-7 <br /> indicate the potential for significant shallow soil contamination. The EHD believes that that <br /> area of primary concern is in the former UST pits area. <br />