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E C 0 R <br /> Ms Victoria McCartney <br /> January 23, 2004 <br /> . Page 2 ' <br /> Number of Detections Minimum Maximum <br /> Constituents above the MDL of the 10 Concentration in pg/L(Well ID) Concentration in pg/L(Well ID) <br /> Total Samples <br /> i <br /> TPHg 4 i 330(MW-5S) 3,500(MW-6S) <br /> Benzene 0 ND ND <br /> MtBE 4 3,700(MW-4) 35,000(MW-6S) {i <br /> Definitions <br /> a <br /> MDL=Method detection limit <br /> gglL=Micrograms per liter <br /> ND =Non detect <br /> BATCH EXTRACTION RESULTS <br /> Batch extraction was Initiated on November 18, 2003, following the 402003 monitoring and sampling <br /> event on November 11, 2003 Therefore, the groundwater monitoring and sampling results do not <br /> reflect the effects of monthly extraction events As of December 4, 2003, monthly batch extraction <br /> has removed approximately 0 4 pounds of MtBE Following the first quarter 2004 (102004) <br /> • monitoring and sampling event scheduled for February 3, 2004, SECOR will evaluate the <br /> effectiveness of batch extraction and if necessary evaluate the feasibility of other alternatives for <br /> restoring and protecting the beneficial uses of groundwater at the site <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 /> F� <br /> A. <br /> avid M Evans <br /> Project Manager <br /> All <br /> ATTACHMENTS <br /> Attachment B— December 5, 2003, Groundwater Monitoring & Sampling Report by Gettler- <br /> Ryan Incorporated ' <br /> r <br /> I <br /> cc Mr Robert J Cochran, Chevron Environmental Management Company, San Ramon, CA <br /> Mr Jim Barton, Regional Water Quality Control Board, Sacramento, CA <br /> 11Chevron1914521Penodic Monitoring1200314Q2003 QMR 91452 doc SECOR lntematronal incorporated <br /> i <br />