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ARCADIS Mr. Roberto Cervantes <br /> September 7, 2010 <br /> Comment#5 <br /> "Chevron should collect some samples for laboratory analysis such that data can be <br /> compared to the otherwise qualitative ultra-violet optical screening (UVOST) data." <br /> Response to Comment#5 <br /> We concur. Soil samples will be collected from two soil cores located near the <br /> UVOST borings to provide a semi-quantitative comparison between UVOST data <br /> and direct measurements of petroleum hydrocarbons in soil. <br /> Comment#6 <br /> "Section 3.4 of the work plan proposes to collect two shallow soil samples ranging in <br /> depth from 0 to 3 feet below ground surface. Please provide a rationale for the <br /> collection and depth selection of these shallow samples." <br /> Response to Comment#6 <br /> Shallow soil samples will be collected to evaluate potential impact to soil resulting <br /> from potential aboveground or subsurface releases. The proposed depths are <br /> intended to correlate with potential subsurface piping. The exact locations and <br /> depths of the proposed soil samples may be adjusted pending the results of the <br /> geophysical survey. <br /> Comment#7 <br /> "Chevron proposes to use Lancaster Laboratories, Inc. (Lancaster, Pennsylvania) to <br /> perform the analysis of the soil and groundwater samples. Please provide verification <br /> that Lancaster Laboratories holds a certification from California for the analytical <br /> methods proposed in the work plan." <br /> Response to Comment#7 <br /> Lancaster Laboratories is a California-certified lab. Laboratory accreditation is <br /> provided as an attachment to this letter. <br /> We greatly appreciate your expeditious review of the Work Plan and your comments. <br /> In accordance with our telephone conversation on August 25, 2010, we will not be re- <br /> issuing the Work Plan. Rather, this letter will become an attachment to and, <br /> therefore, a part of the Work Plan. <br /> Page: <br /> rtc-S I W P-San Jose St-Sep 10-80046810.doc 4/5 <br />