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J <br /> ENVIRONMENTAL HEALTH DEPARTMENT <br /> pPpU'N C SAN JOAQUIN COUNTY <br /> Unit Supervisors <br /> v_ Donna K.Heran,R.E.H.S. Carl Bor an,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor � <br /> ' { Mike Huggins,R.E.H.S.,R.D.I. <br /> Al Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> meq., w Program Manager Telephone: (209) 468-3420 Margaret Lagorio,R.E.H.S. <br /> 'Ci i b0.V Laurie A.Cotulla,R.E.H.S. <br /> Fax: (209) 464-0138 Robert McClellon,R.E.H.S. <br /> Program Manager Mark Barcellos,R.E.H.S. <br /> SOUTHLAND CORPORATION AUG 0 8 2002 <br /> BOB DeNINNO <br /> 10220 SW GREENBURG RD STE 470 <br /> PORTLAND OR 97233 <br /> RE: 7 Eleven Store #14117 Site Code:1073 <br /> 2725 Country Club Blvd. LOP-RO#:0000013 <br /> Stockton, CA., 95204 <br /> San Joaquin County Environmental Health Department (EHD) has reviewed The <br /> Shaw Group Inc's June 20, 2002 submittal, "Site Conceptual Model and <br /> Remedial Action Plan" received June 28, 2002 and has the following comments. <br /> This report described the site assessment data and commented on the <br /> petroleum impact to the subsurface, source location, migration modeling, and <br /> MtBE/TBA fate and transport characteristics. Additionally, a discussion was <br /> included for three remedial alternatives by comparing the alternatives for cost, <br /> time, and feasibility. <br /> Your consultant chose dual phase extraction in combination with intrinsic <br /> biodegradation over soil excavation and soil vapor extraction-air sparging as the <br /> most cost-effective remedial alternative. <br /> Although EHD appreciates the intent of the submittal and your eagerness to <br /> proceed with your site clean up, a major concern must be addressed before this <br /> site can proceed into an approved remedial action. <br /> A discussion was included in the site conceptual model portion of the report as to <br /> the limits of the petroleum contamination at the site. Your consultant concluded <br /> that the lateral limits of the petroleum impact to the shallow groundwater were <br /> limited to the area of the new underground storage tank (UST) pit and that `the <br /> lateral delineation of the soil hydrocarbon/oxygenate plume to the west, <br /> northwest, and south of the UST/pump island source areas, and vertical plume <br /> delineation is limited to a depth of less than 25 feet bgs." <br /> Your consultant had previously concluded in a December 2001 report that `the <br /> lateral extent of TPH-G, BTEX, WE, and other oxygenates in the soil have <br /> been delineated by non-detectable levels (except for 0.006 mg/kg total xylenes <br /> in well MW-7) to the west, northwest, and south of the known plume area." The <br /> eastern extent of this site's subsurface petroleum impact to the soil is undefined.. <br />