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S E C 0 R <br /> Ms. Victoria McCartney <br /> April 30, 2004 <br /> Page 2 <br /> 1 � <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 10 Concentration in pg/L(Well ID) Concentration in pg1L(Well ID) <br /> Total Samples <br /> TPHg 2 <br /> 1,000(MW-8) 4,000(MW-6S) <br /> Benzene 0 NO NO <br /> MtBE 4 +� 67(MW-4) 47,000(MW-6S) <br /> = Definitions: <br /> MDL=Method detection limit <br /> pg/L=Micrograms per liter <br /> NO =Non detect <br /> BATCH EXTRACTION RESULTS <br /> Monthly batch extraction was initiated on November 18, 2003. As of March 18, 2004, monthly batch <br /> extraction has removed approximately 1 pound of dissolved MtBE. <br /> If you have any questions or concerns regarding these activities, please feel free to contact me at <br /> (916)861-0400 extension 234. <br /> Sincerely, <br /> SECOR International Incorporated <br /> avid M. Evans <br /> Project Manager <br /> ATTACHMENTS: <br /> Attachment A—March 25, 2004, Groundwater Monitoring & Sampling Report by Gettler-Ryan <br /> Incorporated <br /> cc: Mr. Robert J. Cochran, Chevron Environmental Management Company, San Ramon, CA <br /> Mr. Jim Barton, Regional Water Quality Control Board, Rancho Cordova, CA <br /> i <br /> I <br /> 1 . <br /> lAChevron1914521Periodic Monitoring1200411Q2004 QMR 91452.doc SECOR International Incorporated <br />