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OCT - 5 - 9!5 V R I 9 - 3 2 P 0:3 <br /> 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, WrN k Plan for Soil Vapor Ewraction_ For your reference a pamphlet describing <br /> the proposed installation technique for the vent and sparge probes is included as <br /> Attaehment 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, fnrerim Remedial Action Plan(TRAP). Included as Attacluneot A in the TRAP <br /> is a Sail Vapor Feasibility Test and CumpurerModeling, 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 /> Pari c Environmental Group,Inc_ <br /> seph Muzz <br /> rojeet Geologist <br /> ('EG 1672 <br /> Atiachinents: Figure I - SitePlan <br /> Attachment A - Precision Sampling Inc Pamphlet <br /> Attaelunent B - PACIFIC's Interim Remedial Action Plan <br /> ccs Ms. Elizabeth Thayer, Regional Water Quality Control Board - <br /> Central Valley Kegion <br /> Mr. Ed Ralston, Unocal Corporation <br /> sro,�0,:+tuarsUvnk <br />