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CTeologtcal Tcckrurs nc. <br /> Page 7 <br /> Valley Wholesale Drug Company <br /> Project No 989 2 <br /> November 8,2004 <br /> ' 1) Analysis of the 21-feet bgs sample mdxcates an average K value of 6 87E-07 cm/sec and <br /> an average effective porosity of 0 3917 The average honzontal groundwater velocity (v) <br /> is estimated to be 0 012 ft/yr <br /> 2) Analysis of the 26-feet bgs sample indicates an average K value of 1 17E-07 cm/sec and <br /> an average effective porosity of 0 3811 The average horizontal groundwater velocity(v) <br /> ' is estimated to be 0 002 ft/yr <br /> 3) Analysis of the 41-feet bgs sample indicates an average K value of 6 28E-07 cm/sec and <br /> an average effective porosity of 0 4238 The average horizontal groundwater velocity(v) <br /> ' is estimated to be 0 01 ft/yr <br /> 2.6 Conclusions <br /> ' • The lithology o y f the site is relatively flat and uniform in distribution <br /> ' • Groundwater elevation, gradient and bearing have been relatively consistent since site <br /> investigations began <br /> • All soil samples were non-detect above laboratory reporting limits for all analyzed <br /> ' constituents <br /> • Trace levels of MtBE were recorded in four of the eight GeoProbe borings <br /> • All other analyzed constituents were non-detect above laboratory reporting limits in all <br /> eight GeoProbe boreholes <br /> • From previous investigation activities and groundwater monitoring we find that three <br /> monitoring wells contain TPH-g & BTEX at low to trace levels and that six monitoring <br /> ' wells contain low to trace levels of MtBE <br /> ' 3.0 APPENDIX B SITE CLOSURE CHECKLIST <br /> ' 3.1. Receptor Well Survey <br /> A sensitive receptor survey was performed In August of 2002 encompassing a 2000-foot <br /> ' radius around the site The following conclusions are discussed in the Receptor Survey <br /> Report—October 15, 2002 <br /> • No City Wells were located in the 2000-foot search radius, thus impact to <br /> municipal water supply seems unlikely <br /> • The domestic water supply in the search area comes from the municipal water <br /> supply and not from domestic wells It is not likely contamination originating <br /> tfrom the former USTs at VWDC would impact domestic water supplies <br /> • Domestic and irrigation wells formerly or currently located in the area are at such <br /> a depth and distance that impact from plume migration is unlikely <br /> ' • Groundwater monitoring at the site indicates the contaminants are moving away <br /> from the Stockton Deep Water Channel and the Mormon Slough Impact to <br /> these receptors from the site appears unlikely <br /> 1 � <br />