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i <br /> Mr Martin Harris <br /> April 27,2004 <br /> t� Page 7 of 7 <br /> A discrete groundwater sample collected from a depth of 31-35 feet bgs contained no <br /> detectable concentrations of gasoline constituents, including MTBE or benzene <br /> 5.4 CONCLUSIONS <br /> The vertical extent of groundwater contannunation has been defined Based on analytical results <br /> from the discrete groundwater samples collected from SB4, groundwater contamination does not <br /> exceed a depth of approximately 27 feet bgs The lateral extent of groundwater has been essentially <br /> defined, as the furthest well downgradient contained only very low levels of MTBE (3 7 and 5 0 <br /> ppb) <br /> Please feel free to contact the undersigned at (209) 838-9888 if you have any questions regarding <br /> this submittal <br /> Respectfully, <br /> Ground Zero Analysis, Inc ��`a' �0. <br /> J0 P1 P <br /> No 6;95 <br /> John P Lane, <br /> CA Registered Geologist No 6795 <br /> Attachments <br /> cc Mr James L L Barton, RWQCB <br /> I <br /> Ms Karen Collins, Environmental Closures, Inc <br /> Mr Martin Harris, Tuff Boy <br /> Groundze/souza/reports/WELLRPT2b doc <br />