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ENVIRONMENTAL HEAL i <br /> DEPARTMENT <br /> OPO........ <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> C <br /> �.o� Carl Borgman,R.E.H.S. <br /> Donna K.Heran,R.E.H.S. 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> Director <br /> Stockton, California 95202-2708 Dnnglas w.wason,R.E.H.S. <br /> 1 Al Olsen,R.E.H.S. Maz azet Lagorio,R.E.H.S. <br /> Program Manager Telephone: (209) 468-3420 Robert McClellon,R.E.H.S. <br /> Laurie A.Corona,R.E.H.S <br /> Fax: (209) 464-0138 mark Bazcellos,R.E.H.S <br /> Program Manager <br /> OCT 2 6 2004 <br /> PAUL ZUMBERGE <br /> FRONTIER TRANSPORTATION INC <br /> 3577 W PHILADELPHIA STREET <br /> CHINO CA 91710 <br /> SITE CODE 2251 <br /> RE: Frontier Transportation, Inc. RO: 252 <br /> 425 Larch Road <br /> Tracy, CA 95376 <br /> San Joaquin County Environmental Health Department (EHD)has reviewed Addendum <br /> to Remedial Action Plan for the Frontier Transportation <br /> Property and located t 425 on your Road, Tracy, California dated September 21, 2004,prepared <br /> behalf by Clean Soils, Inc. (CSI). In this addendum, CSI proposes the excavation of an <br /> area approximately 30 feet north to south, and approximately 60 feet east to west that <br /> includes the re-excavation of the former.tank area, and soil currently beneath the <br /> prefabricated building, to remove the free-phase, dissolved, and adsorbed contaminants. <br /> The building would need to be moved for the excavation to be fully implemented. CSI <br /> also proposes to install two additional groundwater monitoring wells,one located <br /> approximately ten feet southwest of monitoring well MW-3R, and one located <br /> approximately 40 feet southeast of MW-14,to total depths of approximately 40 feet <br /> below surface grade (leg), to define t e vertical extent butyl ether(MTBE). <br /> nzene,toluene, ethyl <br /> benzene, and total xylenes (BTEX), gasoline, and methyl-tertiary <br /> EHD approves the installation of one deep-screened monitoring well toapproximaprovided soil samples <br /> feet bsg to be located approximately ten feet southwest of MW-3R, <br /> are collected at five-foot intervals or the boring is continuously cored for lithological <br /> is screened in the more permeable <br /> evaluation to ensure k et the monitoring lan for the well installation to EHD by November 24,20041= �J` � 4 <br /> Please provide a w p tt Ls <br /> EHD cannot approve soil excavation for remediation of petroleum hydrocarbons and rµt <br /> the installation of the second groundwater monitoring <br /> oxygenates beneath the site, nor <br /> well at this time. Current groundwater analytical data collected from deep wells MW-14, <br /> adient of the proposed second well,report non-detect 5 S <br /> MW-15, and MW-16, down grP P <br /> results for all chemicals of concern. Therefore, an additional well would appear to be , fl <br /> superfluous. If,however, CSI can justify the need for this additional monitoring well, <br /> EHD will reconsider this proposal. EHD believes that the contaminants in soil are <br />