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L u � <br /> Blatt Commercial Brokerage 3 <br /> April 30, 1990 <br /> L202/899-7041 <br /> SOIL BORING <br /> LThe soil boring was drilled with a truck-mounted drill rig equipped with 8-inch outside diameter <br /> (O.D.),steam-cleaned,hollow-stem augers. The drilling was supervised by a field geologist working under <br /> Lthe direction of a State of California registered geologist. A continuous log of materials encountered while <br /> drilling was completed by the field geologist (Appendix II). All soil generated during the drilling operation <br /> L was stored in Department of Transportation (DOT)-approved containers for later disposal by Blatt <br /> Commercial Brokerage. <br /> SOIL SAMPLING <br /> LSoil samples were collected from the soil boring at 2.5-foot intervals to a depth of 16 feet below <br /> ground surface with a final sample obtained at 21 feet. Samples were collected during drilling using a <br /> L2.5-inch 0.D. modified California split-spoon sampler,lined with three 2-inch diameter by 6-inch long brass <br /> sample tubes. The samples were subsequently sealed, capped, labeled, and placed on ice in an <br /> insulated cooler. Three samples were selected for laboratory analysis. Samples were preserved on ice <br /> and delivered with the appropriate Chain-of-Custody manifest to GTEL Environmental Laboratories, Inc. <br /> (GTEL), a State-certified laboratory, in Concord, California. The soil samples were analyzed for total <br /> Lcopper and total lead using U.S. Environmental Protection Agency (EPA) Method 7420. <br /> LMONITORING WELL INSTALLATION <br /> L The soil boring (SBA) was completed as a groundwater monitoring well (MW-1), to determine <br /> whether the groundwater beneath the site was contaminated with copper and/or lead. The monitoring <br /> L well was installed to the total depth of the soil boring of 21 feet. The well was constructed of 10 feet of <br /> 0.020-inch machine-slotted PVC screen threaded to 10 feet of blank PVC casing to the surface. The <br /> annular space from 9 feet to 21 feet below grade (BG) was filled with number 2/12 grain-size sand. The <br /> remaining annulus was then sealed with approximately 1.5 feet of bentonite, overlain by 7.5 feet of sand- <br /> cement grout to the surface. The sealing of the well annulus was inspected by Mr. Harlan Knoll of the <br /> LSJLHD. A locking cap and traffic-rated street box were installed to provide access to the well. A specific <br /> well construction detail is shown on the drill log included in Appendix II. <br /> L ❑❑® GROUNDWATER <br /> ❑❑ TECHNOLOGY,INC. <br /> L <br />