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ENVIRONMENTA <br /> L HEAL� DEPARTMENT <br /> SAN JOAQUIN COUNTY Unit Supervisors <br /> Donna K.Heran,R.E.H.S. Carl Borgman,R.E.H.S. <br /> Director 304 East Weber Avenue, Third Floor Mike Huggins,R.E.H.S.,R.D.I. <br /> At Olsen,R.E.H.S. Stockton, California 95202-2708 Douglas W.Wilson,R.E.H.S. <br /> Program Manager Telephone: (209)468-3420 Margaret Lagorio,R.E.H.S. <br /> qt�c BRA\ Coruna,R.E.H.S. Robert McClellan,R.E.H.S. <br /> Laurie A.Coruna, Fax: (209) 464-0138 Mark Barcellos,R.E.H.S. <br /> Program Manager <br /> JAN 0 7 2004 <br /> PAUL ZUMBERGE <br /> FRONTIER TRANSPORTATION INC <br /> 3577 W PHILADELPHIA STREET <br /> CHINO CA 91710 <br /> RE: Frontier Transport, Inc. SITE CODE 2251RO: 252 <br /> 425 Larch Road <br /> Tracy, CA 95376 <br /> San Joaquin County Environmental Health Department(EHD)has reviewed Site <br /> Conceptual Model received on 14 July 2003, and Work Plan for Frontier Transportation <br /> 425 Larch Road, Tracy, California, dated 9 October 2003,which were submitted on <br /> your behalf by Blakely Environmental Investigations, Inc. (BEII) for the above <br /> referenced site. BEII proposed the installation of eight additional monitoring wells - <br /> five shallow wells advanced to a depth of twenty feet below surface grade (bsg) and <br /> three deep wells advanced to forty feet bsg. <br /> EHD approves the installation of the three deep-screened monitoring wells to monitor the <br /> sand at approximately forty feet bsg down and cross gradient of monitoring well MW-14. <br /> However, EHD approves only one shallow well for site characterization to be located <br /> south of MW-14. <br /> EHD does not approve the installation of the four other shallow-screened monitoring <br /> wells for the following reasons: <br /> ` . The proposed wells west of MW-9 and northwest of MW-4 are not necessary at <br /> this time because MW-4 and MW-9 appear to be located on the western margin of <br /> the first water plume and adequately delineate contamination in this direction. <br /> The proposed well south of MW-3R may help refine the south/southeast plume <br /> margin delineation; however,EHD believes that MW-6 and MW-11 adequately <br /> monitor the south and southeast margins of the plume and an additional well <br /> would be superfluous at this time. <br /> The proposed well south of MW-9 does not appear to be necessary due to its <br /> proximity to the proposed well south of MW-14, and as MW-9 and MW-5 appear <br /> to adequately monitor the margins of the plume toward the southwest at this time. <br />