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L, <br /> J <br /> 1 <br /> Aquifer Pump Test Report of Findings <br /> Frontier Transportation, Inc. <br /> November 8, 2006 <br /> Page 4 <br /> 1 <br /> The past groundwater gradients included in quarterly groundwater monitoring reports have <br /> identified the flow of groundwater in a generally western direction beneath the site. See Figure 3 for <br /> the most recent groundwater gradient. <br /> 4.0) SITE ASSESSMENT RESULTS <br /> On September 26, 2006 and September 27, 2006, BEA supervised the installation of <br /> groundwater monitoring wells MW-22 and MW-23 . These wells were installed for the purpose of <br /> performing an aquifer pump test at MW-3R with the two new wells as observation wells during <br /> pumping. (See Figure 2 for well locations). Shallow monitoring wells MW-22 and MW-23 were <br /> advanced to 20 ' bgs. The aquifer pump test at MW-3R was performed on October 13 , 2006. <br /> 4.1) Well Installation <br /> An 8-inch outside and 4.25-inch inside diameter hollow stem auger was used to install the <br /> monitoring wells. The new groundwater monitoring wells were constructed of schedule 40 PVC <br /> casing. The screen slots were sized at 0.01 -inch with a size #2/16 sand annular pack. The new <br /> shallow wells were screened from 5 ' to 20 ' bgs and the sand annular pack extended from 4. 0' bgs to <br /> 20 ' bgs . The annular seal was one foot thick and consisted of bentonite pellets. The remaining <br /> annular space was grouted to surface with a Portland cement and potable water mixture. Ends of the <br /> screen and riser sections were constructed with flush-joining threaded fittings to ensure leak-proof <br /> unions. (See Appendix A for well construction). <br /> 4.2) Soil Sample Results <br /> Soil samples were collected at 5-foot intervals from a split spoon sampler that contained three <br /> brass liners, which were 2 inches in diameter and 6 inches long. Soil samples were screened for <br /> petroleum hydrocarbons in the field using a Min1R AF 2000 PID (Model PGM7600) photoionization <br /> detector (PID). A total of eight (8) soil samples were collected from MW-22 and MW-23 . Four <br /> samples were taken for each well at depths of 5 ' , 10 ' , 15 ' and 20 ' bgs. All samples were analyzed for <br /> TPH-g (C4-C12), BTEX, and MTBE, TBA, DIPE, ETBE, TAME, 1 ,2-DCA and EDB using EPA <br /> ;I <br /> methods 8015M and 8260B as requested by the PHS/EHD . The four samples from MW-23 were <br />