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1 <br />' Mr Harlan Knoll <br /> August 9, 2001 <br /> Page 7 of 7 <br /> feet bgs in site wells <br />' • MTBE was the only constituent of concern detected in the groundwater samples collected <br /> from site monitoring wells MTBE was detected in wells MW1, MW3 and MW4 at <br /> concentrations ranging from 58 to 320 ppb <br /> Potential sensitive receptors within 2,000 feet of the subject site include one school, five churches, <br /> and as many as 17 water supply wells However, no sensitive receptors appear to be located within <br /> 2,000 feet in the downgradient direction from former site operations <br /> 7.0 CONCLUSIONS <br /> rPrevious remedial work conducted at the site appears to have been successful in eliminating the <br /> contaminant source Soil and groundwater analytical results suggest that no significant amounts <br /> of petroleum hydrocarbons are present in the vicinity of the former USTs However, <br /> groundwater in wells downgradient and within the source area contained MTBE at levels <br /> exceeding the drinking water standard (13 ppb) established by the State of Califorrua <br /> 8.0 RECOMMENDATIONS <br /> Ground Zero recommends additional groundwater sampling to confirm contaminant concentrations <br /> and groundwater flow direction and gradient In addition, based upon analytical results of <br /> confirmation samples, stockpiled soil remaining on site should be made available for use as fill <br /> and/or road base within property boundaries <br /> Please feel free to call John Lane of Ground Zero at (209) 838-9888 if you have any questions <br /> regarding this submittal <br /> Respect , <br /> Gro Zero lysis, Inc <br /> p,ED GF <br /> can Garvey, <br /> Staff Geologist JOHN P <br /> LANE <br /> r <br /> I No 6795 <br /> ohn P Lane `n"y <br /> CA Registered Geologist No 6795 �E` 4 <br /> QFCN, c <br /> Attachments <br /> Icc Mr Marty Hartzell, RWQCB <br /> Mr Patrick D Riddle, Attorney at Law <br /> IMr Art Wyatt, Barnyard Corporation <br /> G\Data\GROUNDZE\Barnyard-Manser\Reports\WELLRPT doe <br />