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ENVIRONMENTAL HEALTH DEPARTMENT <br /> 4111 N <br /> SAN JOAQU1 'COMM' <br /> Pragrattt Coordinators <br /> Oonua K Heran, R E:.H.S. <br /> �IrL'C101 304 East-Weber Avenuc,Third Floor Carl Borgrnan R.E.H.S. <br /> Laurie A. Cotull:i R.1r.H.S. Stockton,.Califomis 95202-2708 Mike.Huggins, R.E.H.$., R.D.I. <br /> a�P Assistant Diger tnr Telephone: (2Q9 468-3920 Margaret:Lagorio, R E.H.S. <br /> Robert MCClellon, It E.H.S. <br /> Fax: (209)464-01.38 Jeff Carruesco,R.E..H.S. j <br /> Website:www.sjf,,ov.oi-g/ebd/ Kasey Foley, rr,E:H.s, <br /> FOUR BS PARTNERSHIP <br /> ruh� JUL Q Bi ZQurrtt <br /> DANIEL FOLCHER '' <br /> 71 W PARK AVENUE <br /> VINELAND NJ 08363 <br /> RE: National Freight SITE CODE: 1651_ <br /> 2850,Lbomis Road <br /> Stockton, CA 95205 <br /> San Joaquin County Environmental. Health Dep tinent (EHD) has reviewed the soil <br /> lithology and analytical results for soilborings:advanced at the above-referenced site and. the <br /> adjacent site located. at°29.00 Loomis Road, as wcll " s-the.groundwater analytical results for <br /> samples collected, quarterly since August 23, 2000, that were submitted by Advanced <br /> GeoEnvironmental, Inc. (AGE) on your behalf. Diesel coinccntrat ions remain high iti <br /> g bandwater samples collected from monitohng we 1 MW-1. AGE has proposed extracting <br /> groundwatet from MW-1 ``io evaluate the stability of the dissolved total petroleuln <br /> 'hydrocarbons as diesel (TPH-d) in the groundwater, papillary 'zone, and smear zone." <br /> EHD concurs with AGE.'s recommendation to test groundwater-extraction as a groundwater <br /> remediation method to reduce diesel concentrations at this site. Please submit a work plan to <br /> EHD by August 3.0,1006,.to evaluate extracting;groundwater from MW-l.. <br /> EHD does not believe, that the.vertical. extent of impacted soil' and ,groundwater has been <br /> adetltiate.ly demonstrated. in the former underground storage tank (UST) location. Soil <br /> sarnples collected at appro,irnatety 100 feet Belo gfound surface (bgs) in the deepest <br /> borehole, P3,, contained diesel concentrations of 7.8 milligrams per kilogram (mg/kg). <br /> Additional: subsurface investi gation.is necessary to c valuate or confrin the vertical extent of <br /> impacted sail and groundwater in the, gravel and-s nd encountered at approximately 80 to <br /> '100 feet bgs in'the soutce area. Please submit a wok plan to EHD by September 27;,2006; <br /> that will address this investigation. <br /> EHD is concerned that the diesel-impacted v.adose one soil at the former UST site may be <br /> acting as a secondary source,that continues to impac the groundwater. As the soil lithology <br /> tends to be primarily sand and silt, with very lit le: clay,, the released diesel may have <br /> descended nearly vertically throu,gb the, subsurfaceto grout dwater with minimal lateral. <br /> diffusion in the vadose zone. The approximately.six y-five-feet of.imgacted vadose zone soil <br />