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Gcolagual recluucslnc Page 11 Dual Phase Extraction Pilot Test Report Project No 662 2 February 22,2005 tproperly and recorded readings as "December 30, 1899" (see Appendix D for Barologger® data table printout) We called Solinst and confirmed the unit malfunctioned and the data ' recorded was unusable A second problem occurred with heavy rain fall during the test The Levelogger in MW-1 ' was removed because rain water was flowing into the well box and seeping into the well The wells have to be open for the Leveloggers to function properly but MW-1 was sealed as soon as the water infiltration condition was discovered All of the Levelogger graphs are included in Appendix D A third problem was a malfunction in the MW-6 Levelogger that did not operate correctly ' and recorded the elevations as the"32 80" foot range of the instrument This data is included in Appendix D ' In spite of the inability to compensate the Leveloggers for barometric pressure a graph of the MW-3 Levelogger data does illustrate groundwater elevations changes GTI produced Figure ' 4 using the MW-3 elevation data and added notes to show operator induced changes The calculated groundwater extraction rates from shallow extraction well EW-2 varied 0 8 — 18 gpm for the first 22 hours of the pumping test This well had an approximate water column of 5 feet at the start of the test and the decline in extraction rate was expected as the well dewatered ' Extraction from EW-2 and the deep extraction well EW-1 commenced on December 7`i' (Tuesday) at 11 15 The stinger was lowered to the water table (-27 feet bgs) but the hose 1 continually "deadheaded" as stated above in section 4 3 The stinger was lifted from 27 feet bgs to 20 and water started flowing again As evident in Table 5, the combined now from the two wells started at 2 6 gpm and then rose to 11 gpm by 16 00 Figure 4 shows a drop of ' approximately 0 5 feet when the two wells were active GTI believes that a rate of 10 gpm could have been sustained throughout the remainder of the test if we had the capacity to store the water As noted above we had to reduce pumping rates to preclude the American Valley ' tank from overflowing Figure 4 shows several increases on Tuesday night as the extraction rate was adjusted to ' preclude overfilling the American Valley tank Once the water pickup schedule was set at three events per day the system achieved a fairly consistent 5 — 7 gpm The groundwater elevation in MW-3 showed a gradual recovery until the system failure on Thursday afternoon ' The system was restarted at 16 00 and the elevation declined again as extraction continued One last spike is evident on Friday afternoon as the Mako contractor was showing the ' equipment to another client (with GTI's permission) and made changes to the system 1