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8) Prepare a report outlining the methods and findings of this <br /> assessment. <br /> Details of the assessment are presented below. <br /> 3 . 0 DRILL SOIL BORING AND COLLECT SAMPLES <br /> Prior to drilling, ASE obtained drilling a permit from SJCPHS-EHD. A copy <br /> of this permit is presented in Appendix A. <br /> On July 28, 1998, V&W Drilling of Rio Vista, California drilled soil boring <br /> BH-A at the site using a Geoprobe hydraulic sampling rig (Figure 2). This <br /> boring was drilled directly through the location of the former UST at the <br /> site. The UST location was outlined on the ground with paint by Ms. <br /> Maxine Hanson. This location also corresponded with the location of the <br /> UST shown on drawings in the April 1995 Phase I Environmental <br /> Assessment prepared by Phase One, Inc. The drilling was directed by ASE <br /> senior geologist Robert E. Kitay, R.G. <br /> Undisturbed soil samples were collected continuously as drilling <br /> ,progressed for lithologic and hydrogeologic description and for possible <br /> chemical analysis. The samples were collected by driving a sampler lined <br /> with acetate tubes using hydraulic direct push methods. Soil samples <br /> collected from 8-feet bgs, 13-feet bgs and 18-feet bgs were immediately <br /> trimmed, sealed with Teflon tape, plastic end caps and duct tape, labeled, <br /> sealed in plastic bags and stored on ice for transport to Chromalab, Inc. of <br /> Pleasanton, California (ELAP #1094) under chain of custody. Soil from the <br /> remaining tubes were described by the site geologist using the Unified Soil <br /> Classification System and were screened for volatile compounds using an <br /> Organic Vapor Meter (OVM). The soil was screened by emptying soil from <br /> one of the sample tubes into a plastic bag. The bag was then sealed a n d <br /> placed in the sun for approximately 10 minutes. After the volatile <br /> compounds were allowed to volatilize, the OVM measured the vapor in the <br /> bag through a small hole punched in the bag. OVM readings can be found <br /> on the boring log located in Appendix B. <br /> A temporary PVC well casing was driven into place in the boring for t h e <br /> collection of groundwater samples. Groundwater samples were removed <br /> from the boring using dedicated polyethylene tubing with a check ball at <br /> the base. The groundwater samples were contained in 40-m1 volatile <br /> organic analysis (VOA) vials without headspace, 1-liter amber glass bottles <br /> and a 1-liter poly bottle. The samples were labeled and stored on ice for <br /> transport to Chromalab under chain of custody. <br /> Hanson Property Report - August 1998 <br /> -2- <br />