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Geological Technics inc. ( Page 8 <br /> `, Additional Pilot Test Work Plan <br /> Project No.770.2 <br /> January 23,2009 ,Ir <br /> `' <br /> Screen Filter Pack Annular Grfiut Seal <br /> `, Well Depth Casing Slot Size Sand Type Interval(ft) (ft) Seal(ft) (ft) <br /> Boring (ft) Type (1°) From To From To From—-TV From To <br /> l7 EW-4 70 PVC 0.02 #3 70 45 70 43 43 3 33 S <br /> 6.1 � _ EW-5 55 PVC 1 0.02 #3 55 30 55 28 20 20 S <br /> �vEW-6 35 PVC 0.02 #3 35 10 35 8 8 5 5 S <br /> 4.2 Dual Phase Extraction System <br /> The general process for dual phase extraction is as follows: <br /> ■ Extract vapors and water using a liquid ring vacuum pump. 7. <br /> V <br /> ■ Separate the influent vapors and water in a portable vacuum tank. <br /> ■ The contaminated vapor is then oxidized in a thermal oxidizer. <br /> ■ The captured contaminated groundwater is transferred to a tanker truck trailer via a high <br /> vacuum pump. The tank trailer will be emptied at regular intervals by a licensed hauler <br /> for transportation to a waste disposal facility. <br /> tow ■ Collect data for actual vacuum flow and contaminant concentrations and temperature. <br /> ■ Delineate the area of influence from the applied vacuum and groundwater draw down <br /> through use of observation wells. <br /> 60 <br /> 4.3 Equipment <br /> v ■ A self contained trailer-mounted unit will be procured with liquid ring blower, water <br /> transfer tank, thermal oxidizer and control panel. <br /> A temporary propane tank will be used as fuel for the thermal oxidizer unit. <br /> ■ Hoses will be used to connect the well heads to a manifold on the trailer input pipe. <br /> ■ A 4000 gallon tank trailer will be used to hold the extracted water and then it will be <br /> hauled off at periodic intervals to a licensed disposal facility. <br /> V <br /> 4.4 Phased Dual Phase Extraction Tests 3�S 55,51 �.� Pq4 . <br /> , ;, .4 <br /> First Test: <br /> The first test will start with extraction from well EW-4 w cojs located between MW-5 and ; <br /> MW-7, the most heavily impacted wells. GTI will att, I to maximize extraction efficiency S � <br /> with vacuum influence measured in adjacent monitoring Uells screened across the water table <br /> S� (MW-4, MW-5 and MW-7) in new wells pairs IW-1/101, EW-1/101, EW-2/102 and EW-3 �Vj <br /> .�I <br /> A 3/103. The test will continue for 5 days and 3 groundwater and 3 air samples will be <br /> collected for the analyses mentioned in Section 49. Vacuum, PID, and groundwater depth <br /> t will be measured a minimum of 10 times in the above mentioned wells over the course of the <br /> 5 day test. The system is turned off for 9 days to get back to the initial conditions before <br /> starting the second test. <br /> R <br /> A; w&(ls Pt drowne.,A� vN VJ e'er yacVvr" 46 Q""-c `� M►�'��M�S� 11kr <br /> EW �w 101-1 €tiI'103 <br />