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6 0 <br /> San Joaquin County DIRECTOR <br /> Po i N Donna Heran, REHS <br /> C).. �\ Environmental Health Department ASSISTANT DIRECTOR <br /> v r,*,—u G\ 600 East Main Street Laurie Cotulla,REHS <br /> aStockton, California 95202-3029 PROGRAM COORDINATORS <br /> -"""- -" Mike Huggins,REHS,RDI <br /> o p Website: www.s ov.or /ehd Margaret Clelloo,REHS <br /> oR`' /9 8 RobertMcClellon,REHS <br /> Phone: (209) 468-3420 Jeff Carruesco, REHS,RDI <br /> Fax: (209) 464.0138 Kasey Foley,REHS <br /> April 2, 2009 <br /> Jay Mcllrath <br /> JC & M Mcllrath <br /> PO Box 326 <br /> Stockton, CA 95201 <br /> Subject: JAMAR Service Site Code: 1667 <br /> 4075 Main Street <br /> Stockton, CA 95212 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Supplemental Subsurface Investigation Work Plan (Work Plan 1) dated February 27, 2009, <br /> and Interim Remediation Implementation Work Plan (Work Plan 2) dated March 5, 2009, <br /> prepared on your behalf by ATC Associates, Inc. (ATC) and has the following comments. <br /> In Work Plan 1 ATC proposes the advancement of one cone penetrometor test (CPT) boring <br /> with accompanying hydropunch borings to collect discrete grab groundwater samples below <br /> the "C" zone onsite, and the installation of two deep, discretely screened groundwater wells <br /> to monitor the lateral extent of the groundwater contamination reported in the "C' zone grab <br /> groundwater samples collected from previous CPT borings. <br /> In Work Plan 2 ATC proposes installation of one shallow groundwater monitoring well to <br /> define the shallow plume to the north, installation of two additional ozone infusion points and <br /> connecting them to the ozone remediation system (piping is already installed), trenching and <br /> piping to connect the soil vapor extraction (SVE) wells onsite to the remedial compound, and <br /> initiation of interim soil remediation by SVE. <br /> The EHD believes that the C-zone monitoring wells should be installed to verify the reported <br /> concentrations of contamination from the CPT borings in the deeper zone before any <br /> additional CPT work is done. The EHD also requests an additional C-zone monitoring well be <br /> installed in the northeast corner of the property, near the locations of CPT-2/MW-1. The EHD <br /> does not approve installation of additional ozone infusion points in the C-zone until the new <br /> deep monitoring wells confirm contamination onsite in that zone. <br /> The EHD approves the following scope of work at this time: <br /> 1. Installation of one shallow groundwater monitoring well in the northeast corner of <br /> the site. <br /> 2. Installation of three groundwater monitoring wells screened in the C-zone; two of <br /> the wells will be located onsite, one near CPT-3/MW-3 and one near CPT-2/MW-1, <br /> one will be located offsite near CPT-4. These C-zone wells borings should be <br /> continuously cored near and through the target depth interval to ensure placement <br /> of the screen interval over an appropriate water bearing zone. <br />