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Mr Jeff Wong <br />' Page 4 of 4 <br /> Approximately 163,463 gallons of water was treated during the reporting period A total of <br />' approximately 225,713 gallons of groundwater has been treated between November 2003 and March <br /> 30, 2004 During that period, approximately 44 pounds of petroleum hydrocarbons, including <br /> approximately 18 pounds of MTBE, were removed through the treatment system <br /> Groundwater in the shallow aquifer beneath the site generally flowed to the northeast when monitored <br /> on March 16, 2004, although a pumping depression was evident around the extraction well (MW 1) <br />' MTBE was detected at elevated levelspp <br /> 1,500 b) in downgradient A Zone well MW 12 and at <br /> � <br /> relatively low levels in C Zone well MW13C, which is located east of the former water supply well <br />' No MTBE was detected in B Zone well MW14B, which is located within a few feet of the former <br /> water supply well <br />' 5.0 RECOMMENDATIONS <br />' Based upon the data summarized herein, Ground Zero recommends installing two additional <br /> shallow monitoring wells to further investigate the extent of MTBE downgradient (north and <br />' northeast) of well MW 12 and a groundwater exrtaction well to remediate groundwater near well <br /> MW12 In addition, Ground Zero is working with Slaby Sales/Neep Systems to complete delivery <br /> and installation of the air stripper in order to increase the capacity of the groundwater remediation <br />' . system <br /> Please contact Ground Zero at (209) 838-9888 if you have any questions or require additional <br />' information <br /> Respectfully, ���ED GEO� <br />' Ground Zero Analysis,Inc Off, <br /> J o <br /> LANE n <br /> No v19J 1 <br /> John P Lane <br /> CA Registered Geologist No 6795 �' OF C� <br /> Attachments <br />' cc Mr Ray Baglietto/Mr Frank Rauzi <br /> Mr James L L Barton, CRWQCB <br /> 1 <br /> i <br /> 1 <br />' G 1GROUNDZEITULEBURGIReports\QMR5200311QM2004 doc <br />