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f , <br /> GROUND ZERO ANALYSIS, INC. <br /> 1714 Main Street <br /> Escalon,California 95320-1927 <br /> Telephone: (209)838-9888 C <br /> �7 n <br /> Facsimile: (209)838-9$$3 Ili° j ; J <br /> SEP 262001 <br /> September 25, 2007 <br /> ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> Ms. Lori Duncan <br /> San Joaquin County <br /> Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Feasibility Study—Enhancement of Existing Remediation Activities <br /> Speedy Foods, 8200 N. Highway 99, Morada, CA 9 ;7,1'z- <br /> Ms. <br /> z.1� <br /> Ms. Lori Duncan: <br /> This Feasibility Study is submitted in response to comments from the San Joaquin County <br /> Environmental Health Department (EBD), in the correspondence dated July 3, 2007. A copy of <br /> the July 3, 2007 correspondence is included as Appendix A. Several issues were addressed in the <br /> correspondence as summarized as follows: <br /> Paragraph 3: Regarding confirmation soil boring location <br /> "...SJC/EHD approves the installation of one confirmation soil boring located near VW2, but <br /> requests that the boring be placed near MW1 and SB2". <br /> • Ground Zero Analysis, Inc (GZA) feels that it would be difficult to quantify the <br /> effectiveness of the soil vapor extraction based on analytical results from soil samples <br /> collected from a soil boring advanced between MW1 and S132. <br /> o The highest concentrations found in the soil data collected from MW 1 and SB2 <br /> indicate the presence of up to 42 mg/Kg TPHg and up to 2.5 mg/Kg of MtBE. <br /> o Soil samples collected from VW2 indicate TPHg levels up to 5,600 mg/Kg and <br /> MtBE levels as high as 14 mg/Kg. <br /> • GZA proposes advancing two soil borings; one per EHD recommendations (between MW1 <br /> and SB2) and one in the location of VW2. <br /> o The cost will be minimal due to rig already being mobilized to the site. <br /> o The location of the proposed soil borings has been modified. <br /> o Figure 2 is site plan modifying the proposed soil boring locations. <br /> :Paragraph 4: Regarding installation of three monitoring wells <br /> "...SJC/EHD approves the installation of these wells, but cautions that care should be taken during <br /> installation to ensure the screen intervals and filter packs do not bridge two sand zones. A shorter <br /> (10 or 15-foot) screen interval may be more appropriate". <br /> G:IGROUNDZEITULEBURGIRcports10709 FS rem enhancement.doc <br /> i <br />