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0 0 <br /> San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> Donna Heran,REHS <br /> 1868 East Hazelton Avenue <br /> PROGRAM COORDINATORS <br /> N. Stockton, California 95205-6232 Robert McClellon,REHS <br /> .. Jeff Carruesco,REHS,RDI <br /> Website: www.sjgov.org/ehd Kasey Foley, REHSLinda Turkatte,REHS <br /> Phone: (209) 468-3420 Rodney Estrada, REHS <br /> Fax: (209) 464-0138 Adrienne Ellsaesser, REHS <br /> March 20, 2014 <br /> Mr. Paul Zumberge and Ms. Daren Zumberge <br /> Frontier Transportation, Incorporated <br /> 3577 West-�� `P v 3oK IBS$ <br /> Chino Hills, California 91710 91'708— 1$ qg <br /> Subject: Frontier Transportation, Incorporated <br /> 425 Larch Road <br /> Tracy, California 95376 <br /> Dear Mr. Paul and Ms. Daren Zumberge: <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Proposed Work Plan for Groundwater Remediation (work plan), dated 4 February 2014, <br /> prepared and submitted by your consulting firm, EnviroMonitoring Services, Inc. (EMS), on your <br /> behalf for the above-referenced site. The EHD directed the submittal of a work plan for <br /> groundwater remediation following a conference call attended by responsible parties, Daren <br /> Zumberge and Gus Osterkamp, consultant Javad Masoudi, PE; of EMS, and EHD personnel <br /> Nuel Henderson, PG, Vicki McCartney and Angelica Marin in which Mr. Masoudi discussed <br /> findings from performing depth-discrete groundwater pump tests. <br /> In the work plan EMS proposes: <br /> • Destruction of dual-phase extraction wells: DPE4, DPE5, DPE7, DPE9, DPE10 and <br /> monitoring well MW-3R, in addition to the destruction of eight monitoring wells: MW-6, <br /> MW-7, MW-10 through MWA2, and MWA4 through MWA6, previously approved by the <br /> EHD by letter dated 18 July 2013; <br /> • Groundwater extraction to remediate the methyl tertiary-butyl ether (MTBE) groundwater <br /> plume; <br /> • Installation of two six-inch-diameter-casing groundwater extraction wells, EW1 and EW2, <br /> with total depths of approximately fourteen feet below surface grade (bsg) at locations <br /> illustrated on Figure 9 of the work plan; <br /> • Continuous collection of soil samples from five to sixteen feet bsg for field observation to <br /> identify permeable soil intervals in which to set the well screens when advancing the <br /> initial boreholes for the two extraction wells; <br /> • Storage of groundwater pumped from the two extraction wells in tanks prior to removal <br /> of the groundwater under manifest to off-site permitted and licensed disposal facilities; <br />