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REMEDIATION TESTING AND DESIGN May 28, 1993 <br /> by RTD in conjunction with Ultramar based on the results of initial <br /> testing. <br /> To determine the capture radius, the distance at which the pressure <br /> differential created by a vacuum is measured in the lateral plane, <br /> the vacuum gradient in neighboring probes will be noted by <br /> recording pressure changes in inches of water ( "H20) using <br /> magnehelic differential pressure gauges . The detection limit for <br /> the vacuum gradient will range from 0 . 01 to 5 . 0 "H2O. Sample purge <br /> rates, vacuum readings and differential pressures will be recorded <br /> for further analysis . Any liquid wastes produced during the VEFT <br /> will be collected in the accumulator and transferred to a 55-gallon <br /> DOT drum and temporarily stored on site . Disposal of extracted <br /> water is the responsibility of Ultramar. <br /> During each VEFT, TVH levels of the extracted vapors will be <br /> monitored continuously with the Beckman . At the end of each test, <br /> a 1-liter Tedlar air bag will be filled with extracted soil gas <br /> vapors for laboratory analysis . The Tedlar air bags will be <br /> transported in iced storage under chain of custody documentation to <br /> a laboratory for analysis of TPHg and BTEX. The laboratory results <br /> may be used to help design and size the vapor treatment system to <br /> be used during remediation. <br /> Report Preparation <br /> Based on the results of the Soil Gas Survey and the Vacuum <br /> Extraction Feasibility Testing, a report will be prepared. The <br /> report will summarize field activities and present results of the <br /> SGS and VEFT. In addition to data presentation, the report will <br /> also contain RTDs conclusions and recommendations for further site <br /> work, if needed. <br /> Copies of the report on the work performed will be submitted to <br /> Ultramar for distribution to all concerned parties . <br /> If you have any questions or comments regarding this Workplan, <br /> please contact me or the Principal Geologist, Howard E . Whitney at <br /> (408) 458-1612 . <br /> Sincerely, <br /> REM IATION TESTIN DESIGN <br /> Thomas E . Armstrong <br /> President <br /> Cr- : Mr. Kenneth Earnest, Ultramar, Inc . <br /> 3 <br />