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N <br /> Rodger Liston <br /> Darpetro Inc. _ - <br /> 749 E. Charter Way, Stockton, California <br /> Page 3 of 3 <br /> The QA/QC program should include a detailed description of the decontamination <br /> techniques to be utilized for all equipment used for purging the monitoring wells or <br /> collecting samples, and appropriate laboratory blanks utilized to detect cross <br /> contamination of samples. <br /> EHD's observations taken during the 14 April 2004 monitoring event were discussed <br /> with Mr. James Barton of the Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) , who expressed general concurrence with the concerns expressed in this <br /> letter. Please note that the directives issued in this letter are in addition to the directives <br /> issued in the EHD letter of 13 April 2004 , and you must still comply with all of those <br /> directives and deadlines. <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 Divisio <br /> Nuel C. Henderson , Jr. , RG/ Marga�io, RENS <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 />