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24 October 1997 <br /> AGE-NC Project No 96-0235 <br /> Page Tof 11 - _ <br /> Upon sample retrieval, the lead brass sleeve was removed from the sampler Both ends of the sleeve <br /> ` were covered with Teflon sheets, capped, sealed with tape, and labeled The samples were placed <br /> In a chilled container and transported under chain-of-custody to MAI Sample duplicates were <br /> monitored for the presence of organic vapor using an OVM and described on boring logs using the <br /> Unified Soil Classification System Boring logs are summarized In Appendix B Selected soil <br /> samples were analyzed for TPH-g, TPH-d, TPH-mo, oil and grease (O&G), BTE&X and MTBE <br /> Analytical methods utilized are noted on the laboratory report in Appendix C <br /> I9 2 MONITORING WELL COMPLETION <br /> F y <br /> The wells were constructed by installing 20 feet of 0 020-Inch slotted 2-inch diameter PVC casing <br /> and flush-threaded 2-inch diameter blank PVC casing to the surface,No 3 sand filter pack from the _ <br /> bottom of the pilot boring to 2 feet above the screened interval, a 2-foot hydrated bentonite seal <br /> I above the filter pack, and neat cement up to the well box Well MW-4 was screened from 13 feet to <br /> 33 feet bsg, well MW-5 was screened from 15 feet to 35 feet bsg A surge block was used to surge <br /> the well and settle the sand filter pack prior to installation of the bentonite seal Figure 4 -As-Built <br /> Diagram AI1-4 and Figure 5 -As-Built Diagraln MW-S show the construction details for the two <br /> wells <br /> 93 FINDINGS AND RESULTS <br /> IThe soil samples collected consisted predominantly of clay between 5 feet bsg to total depth of 35 <br /> feet bsg in MW-5 Clay was also encountered in MW-4 between 10 feet and 20 feet bsg, and silty <br /> sand was encountered between 25 feet and 30 feet bsg Neither hydrocarbon vapor nor hydrocarbon <br />' odor were noted with any soil sample duplicates <br /> Two soil samples, MW2-25 and MW5-25,,underwent laboratory analysis Petroleum hydrocarbons <br /> were not detected in either sample The laboratory report (MAI'Sample Nos 76953 and 76954), <br /> chain-of-custody form and QA/QC are Included In Appendix C <br /> J <br /> 10 0 GROUND WATER MONITORING <br /> I101 PROCEDURES <br /> A ground water morutonng event Involving monitonng,wells MW-1 though MW-5 was conducted <br /> on 27 May 1997 Initially, the water level in each monitoring well was measured relative to the top <br /> the well casing using a Solinst water level meter The depths to ground water and ground water <br /> Advanced G eoEn,.iron mental,Inc <br />