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Chaney, Walton & McCall (LLC) <br /> The first zone of water saturation at the Site and vicinity reportedly occurs at depths of 60 <br /> to 70 feet below grade. Penetration into the first zone of saturation is not expected during <br /> this Site Assessment. The water levels in the monitoring wells onsite will be measured. <br /> 4 <br /> Analytical Laboratory Testing 1 <br /> For this initial sampling event, a total of four soil samples will be submitted to a <br /> California certified analytical laboratory for organic constituent testing using the <br /> following U.S. EPA Methods. <br /> Chemical of Concern U.S. EPA Method <br /> MTBE and BTEX Method 8260 <br /> TPHg Method 8016 <br /> Laboratory testing will be performed with a standard turnaround time of ten to fifteen <br /> business days. <br /> QUALITY ASSURANCE /QUALITY CONTROL PROCEDURES <br /> Standard quality assurance/quality control sample (QA/QC) procedures involving the <br /> collection and processing of environmental samples will be followed. Sampling <br /> equipment will be cleaned between soil sample drives as well as between soil borings. <br /> Collected samples will be labeled with sample identification number, depth of collected <br /> sample, date, a CW&M project number/name and sampler's initials. Soil samples will be <br /> processed and transported to a California certified analytical laboratory under chain-of- <br /> custody procedures. <br /> PREPARE SITE ASSESSMENT REPORT <br /> The Former VFO - Site Assessment Addendum Report (Addendum Report) will be <br /> prepared, which describes the findings of the field investigation outlined above. Based <br /> on the assessment findings, the Report will address the potential that the organic <br /> constituents of gasoline stored during former UST operations at the Site have adversely <br /> affected Site soils. <br /> i <br /> The Addendum Report will also include recommendations for additional Site <br /> characterization activities or regulatory closure, based on the evaluation of Assessment <br /> findings. <br /> i <br /> DFI00101.sJCPH.wkp.011900 6 530.758.$128 v/f <br /> recgroup0earthl ink.net <br />