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' Mr Harlan Knoll <br /> Page 4 of 5 <br /> ion Figure 4 Laboratory reports and chain of custody documentation are included in <br /> Attachment D <br /> 3.0 SUMMARY <br /> • The stratigraphy of the new wells generally correlates with borings and wells previously <br /> drilled at the site <br /> • First groundwater ranged from approximately 7 5 to 13 feet bgs, and stabilized at depths <br /> ranging from approximately 6 3 to 7 6 feet bgs Groundwater flowed in a west- <br /> northwesterly direction <br /> • Soil samples collected from borings MW5 through MW7 contained no constituents of <br /> concern <br /> • No constituents of concern were detected in groundwater samples collected from wells <br /> MW6 and MW7 MTBE was detected at 3 4 ppb in the groundwater sample collected from <br /> well MW5 <br /> 4.0 CONCLUSIONS <br /> Previous remedial work conducted at the site appears to have been successful in eliminating nating the <br /> contaminant source The lateral extent of soil contamination has been defined Soil <br /> contamination was not evident in perimeter wells MW5 through MW7 The lateral extent of <br /> groundwater contamination has also been essentially defined, with all perimeter monitoring <br /> wells containing MTBE at levels below the primary and secondary Maximum Contaminant <br /> Level (MCL) of 5 0 ppb <br /> 5.0 RECOMIS4ENDATIONS <br /> Ground Zero recommends completing the regularly scheduled groundwater sampling event in <br /> December 2002 Additional recommendations will be included in the resultant quarterly <br /> groundwater monitoring report <br /> G\Data\GROUNDZE\Barnyard-Manser\Reports\WELLS RPT MW 567 doc <br />