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I , CLEARWATER GROU PINC dissolved hydrocarbons in groundwater. Results of soil analyses and results of groundwater analyses during the third quarter 1995 indicate that neither soil nor groundwater at the MW-6 location contain hydrocarbons SVE and Sparge Pilot Test ' The results of the SVE pilot test were likely affected by the high groundwater levels, which have addition, the screens were occluded by groundwater in three monitoring wells that would have provided the closest monitoring points On the basis of the results presented in Section 3.6 of this report, the following conclusions can be made regarding the SVE and air sparge pilot tests t + Propagation of air through the vadose zone (given current water levels) is relatively poor, a more effective vacuum propagation will require placing SVE wells less than 35 feet apart, possibly as close as 15 to 20 feet • The applied vacuum should be in the range of 40 to 60 inches, depending upon ' equilibrium conditions, expected flow rates for that vacuum range will be approximately 10 to 40 ACFM per well • Applied pressures of 9 to 12 psi 'in sparge wells will be required to induce ' significant pressure in nearby wells II ' I , • Although no vacuums were applied to the SVE wells during the sparge tests, 1 concentrations of TPHg were significantly higher in the post-sparge air samples I than in the samples collected immediately after the SVE test, TPHg concentrations in the sample from VW-1 increased from 730 to 2,100 ppm, ,and concentrations' in the sample from VW-2 increased from nondectable to 570 ' PPM ' F I I I Iull r I I r I M r E 6191 D1 Q1 PAR/3Q/PILOT " 15 hI Ilia I I i�l��l�d I h`I I jrtbfal 111,111" 'llr�� IE�I�lu�ti �I„I �'il s f I Ilr I�'1_1 I ` E „ P ll�dI I ��I11 [jl4� �'l {'I '�k�fI