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"(V lirL: c+ltjo 4Dtl 1zmK P'.eKf <br /> REMIATION TESTI AM riESY N 11%d Slay 28, 1593 <br /> s <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 its measured in the lateral plane, <br /> the vacuum gradient in neighboring probes will be noted by <br /> recording pressure changes in inches of seater ("H20) using <br /> ma.gnehelic differential pressure gauges. The detection limit for <br /> the vacuum gradient will range from 0.41 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 analysia 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 /> Re1oA.t grep_aX tion <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 /> FJMMXATIOM TEST DESIGN <br /> Thus E. Armstrong <br /> ]President <br /> CC: Mr. Kenneth Earnest, Ultramar, Inc. <br /> 3 <br /> TOW L P.04 <br />