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I J <br /> ® I <br /> *CAMBRIA <br /> minute. An estimate of contaminant mass removed by the GWE system is summarized in the <br /> following table. <br /> MASS REMOVAL BY GROUNDWATER EXTRACTION <br /> Constituent Total Removed <br /> Total Hydrocarbons 1.8 lbs <br /> MTBE 15.2 lbs <br /> Water 2,295,500 gals <br /> ANTICIPATED FIRST QUARTER 2003 ACTIVITIES <br /> Blaine will gauge and sample all wells and tabulate the data. Cambria will prepare a groundwater <br /> monitoring report. <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Groundwater analytical data from all of the wells at this site continue to show a declining or <br /> stable trend with the exception of well MW-6A. During this monitoring event, MTBE was <br /> detected in well MW-6A at a concentration of 8.1 parts per billion (ppb). This well had previous <br /> detections of MTBE during the fourth quarter 2001 and first quarter 2002 and third quarter 2002, <br /> but no MTBE was detected during the second quarter 2002 monitoring event. <br /> Since MTBE has again been detected in this well, we have initiated a monthly sampling schedule <br /> for this well. This increased sampling frequency will provide more data, which will allow us to <br /> better evaluate the MTBE occurrence in this well. The monthly sampling schedule has already <br /> been implemented and an additional groundwater sample was collected on September 6, 2002 <br /> from this well. The concentration of MTBE detected in this sample was 8.7 ppb. These results <br /> are included in this monitoring report. <br /> As requested, Cambria has been sending the monthly sampling results via facsimile to the City of <br /> Ripon (and it's attorney) and the San Joaquin County Environmental Health Department. <br /> 0324 2 <br />