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REMEDIATION TESTING AND DESIGN May 28, 1993 <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 recording <br /> pressure changes in inches of water ( "H2O) using magnehelic <br /> differential pressure gauges . The detection limit for the vacuum <br /> gradient will range from 0 . 01 to 5 . 0 "H2O . Sample purge rates, <br /> vacuum readings and differential pressures will be recorded for <br /> further analysis . Any liquid wastes produced during the VEFT will <br /> be collected in the accumulator and transferred to a 55-gallon DOT <br /> drum and temporarily stored on site . Disposal of extracted water is <br /> 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, a <br /> 1-liter Tedlar air bag will be filled with extracted soil gas vapors <br /> for laboratory analysis . The Tedlar air bags will be transported in <br /> iced storage under chain of custody documentation to a laboratory <br /> for analysis of TPHg and BTEX . The laboratory results may be used <br /> to help design and size the vapor treatment system to be used during <br /> 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 /> T <br /> TION TESTI AND DESIGN <br /> E . Armstrong <br /> President <br /> CC: Mr. Kenneth Earnest, Ultramar, Inc . <br /> Mr. Harlan Knoll , San Joaquin County Public Health Services <br /> 3 <br />