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Rodger Liston <br /> Darpetro Inc. - <br /> 749 E. Charter Way, Stockton, California <br /> Page 2 of 2 <br /> ceasing , the sample tube will continue to act as a gravity flow siphon and produce an <br /> undisturbed VOC sample'. Please include this sample collection method in your <br /> procedure while utilizing the WaTerra system . <br /> The proposed utilization of the WaTerra system will eliminate much of the equipment <br /> decontamination work that must be performed in the field , however some equipment <br /> decontamination in the field is usually unavoidable. The use of spray bottles as <br /> described in Protocols raises some concern , therefore EHD recommends collecting <br /> equipment blanks after performing the last decontamination procedure to test for cross <br /> contamination . After the decontamination method has been shown to be effective, the <br /> blanks should still be collected , but analyzed only if cross contamination is suspected . <br /> The spray from the decontamination procedure should be collected and stored for proper <br /> disposal . <br />,I <br /> The analytical regimen for the groundwater samples was not specified in Protocols; EHD <br /> assumes that the samples will be analyzed for total petroleum hydrocarbons quantified <br /> as gasoline (TPH-g), benzene, toluene, ethylbenzene, total xylenes (BTEX), the five fuel <br /> oxygenates, methanol , ethanol , 1 ,2-dichloroethane ( 1 ,2-DCA) and ethylene dibromide <br /> (EDB) by EPA Methods 8015B , 8020/8021 and/or 8260B as appropriate. <br /> If you agree with the recommendations , conditions and assumptions noted above, you <br /> may proceed with the third quarterly groundwater monitoring event for this year. Please <br /> notify this office at least 48 hours prior to the initiation of any field activities . <br /> If there is any confusion on any of these issues, please call the undersigned for <br /> clarification . EHD desires to assist you and/or your consultant in this matter as much as <br /> possible. Questions or comments may be directed to Nuel Henderson by mail (address <br /> on letter head), or by telephone at (209) 468-3436 . <br /> Donna Heran , REHS, Director <br /> Environmental Health Division <br /> Nuel C. Henderson , Jr. , RG Margaret Lagorio, REHS <br /> Unit IV - Site Mitigation Unit IV Supervisor <br /> cc: James Barton - CVRWQCB <br /> John Cussen — California Geophysical Group, Inc. <br /> Mark Owens — SWRCB Cleanup Fund <br /> Chuck Nichols — USA San Diego LLC <br />