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October 6, 1995 <br /> Page 2 <br /> concrete to the ground surface. This will significantly minimize the potential of surface <br /> water infiltration. Complete well specifications are detailed in PACIFIC'S April 27; <br /> 1995, Work Plan for Soil Vapor Extraction. For your reference a pamphlet describing <br /> the proposed installation technique for the vent and sparge probes is included as <br /> Attachment A. <br /> PACIFIC's reasons for this request are twofold. First, the use of driven points is a <br /> proven technique at the subject site. Presented as Attachment B is PACIFIC'S March <br /> 18, 1993,Interim Remedial,Action Plan (IRAP). Included as Attachment A in the IRAP <br /> is a Soil Vapor Feasibility Test and Computer Modeling, which describes PACIFIC's <br /> soil vapor feasibility test which was performed successfully using temporary driven vent <br /> points. <br /> Second, the use of driven probes is a cost effective approach. In areas of shallow <br /> groundwater, such as the Tracy Unocal site, the installation of driven probes is generally <br /> more cost effective than the more traditional approach of drilled wells, for the following <br /> reasons; (1) an increased density of driven probes can be installed in a relatively short <br /> time period, (2) there are fewer material requirements for driven probes, and (3) no <br /> excess soil cuttings are generated with driven probes. <br /> Should you have questions or comments, please do not hesitate to contact our office at <br /> (408) 441-7500. <br /> Sincerely, <br /> VPacic Environmental Group,Inc. <br /> h Muzzt Geologist <br /> CEG 1672 <br /> Attachments:. Figure 1 - Site Plan <br /> Attachment A Precision Sampling Inc. Pamphlet <br /> Attachment B - PACIFIC's Interim Remedial Action Plan <br /> cc: Ms. Elizabeth Thayer, Regional Water Quality Control Board-• <br /> Central Valley Region <br /> Mr. Ed Ralston, Unocal Corporation <br /> 3100013B/REQVAR <br />