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i <br /> a u <br /> Mr Martin Hams <br /> Page 3 of 3 <br /> Summary <br /> Groundwater levels beneath the site fell approximately 0 62 between March 7, 2003 and June 30, <br /> 2003 Groundwater on June 30, 2003 generally flowed to the west at a relatively flat gradient of <br /> approximately 2 2 ft/mile <br /> Benzene was detected only in well MW 1 at 0 8 ppb, which is below the Maximum Contaminant <br /> Level (MCL) established by the State of California MTBE was detected at very low levels in well <br /> MW (10 ppb) and MW3 (4 4 ppb), which are both below the primary MCL of 13 ppb Only well <br /> MW1 contained MTBE at a concentration exceeding the secondary MCL of 5 0 ppb The <br /> estimated extent of MTBE in shallow groundwater beneath the site is illustrated on Figure 3 <br /> Recommendations <br /> Ground Zero recommends that groundwater samples be collected from the site facility well and the <br /> nearest domestic well for analysis of gasoline constituents including TPHg, BTEX, and MTBE <br /> Copies of flus report should be forwarded to Ms Lon Duncan of EHD and Mr James L L Barton. <br /> of the California Regional Water Quality Control Board, Central Valley Region(RWQCB) <br /> Please feel free to contact Ground Zero at (209) 838-9888 should you have any questions regarding <br /> flus submittal <br /> Respectfully, <br /> Ground Zero Analysis, Inc <br /> l jZ� �C)w P <br /> LANE <br /> No 679:1 <br /> John P Lane =� <br /> CA Registered Geologist No 6795 <br /> c p,���-� <br /> Attachments <br /> • <br /> G 1GROUNDZE\TufMoy\R,portslQMR\2QM2003 doc <br />