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J <br /> r ZLEARWATER <br /> G R O U P, Z N C. <br /> Environmental Services <br /> Ms. Mary Meays February 21997 . <br /> San Joaquin County Public Health Services { <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 - � f <br /> Re: Workplan for Installation of Vapor Extraction Well VW-4 - <br /> Ruiz Grocery, 4491 West Durham Ferry Road, Tracy, CA <br /> Dear Ms. Meays, <br /> On behalf of Mrs. Stella Ruiz, Clearwater Group, Inc. (Clearwater) is pleased to <br /> submit this workplan for the installation of an additional vapor extraction well at <br /> the referenced site. Requisite well installation permit applications and fees for this <br /> task are enclosed. <br /> Purpose <br /> As explained in Clearwater's Revised Remedial Action Plan dated November 12, <br /> 1996, installation of this vapor extraction well will complete the network of vapor <br /> extraction points required to exert vacuum control over the footprint of residual soil <br /> contamination beneath the site. This plan was approved by the San Joaquin Public <br /> Health Services/Environmental Health Division (SJCPHS/EHD) is correspondence <br /> dated November 6, 1996. <br /> Soil Borehole Drilling and Vapor Extraction Well Installation Methods <br /> Clearwater will supervise the installation of a vapor extraction well (VW-4) in the <br /> location shown on Figure 1. Mitchell Drilling Environmental of Rancho Cordova, <br /> California has been selected to provide the contracted drilling services. The boring <br /> for the well will be advanced with standard 10-inch outside diameter hollow stem <br /> augers driven by a truck mounted drilling rig. The boring will be advanced to a <br /> depth of 15 feet below ground surface (bgs). <br /> During drilling, soil samples will be collected at 5 foot depth intervals using a <br /> sampler lined with brass tubes. Portions of each soil sample will be retained for <br /> visual lithologic description by a Clearwater geologist using the Unified Soil <br /> Classification System, and for volatile organic headspace analysis using either a <br /> flame- or photo-ionizing organic vapor meter (OVM). As the extent of soil <br /> contamination is relatively well understood, no soil samples collected from this <br /> boring will be submitted for laboratory analysis. <br /> 520 Third Street,Suite 104 ♦ Oakland,California 94607 -& Telephone 510-893-5160 • Fax 510-893-5947 <br />