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J <br /> CHASE CHEVROLET <br /> 424 VAN BUREN,STOCKTON <br /> PAGE 2 <br /> VW-5 Flow in scf n ,Vacuum in inches of water), and PID in parts Vermillion) <br /> Sample Date 12-30-99 1-27-00 3-30-00 428-00 5-23-00 6-]5-00 9-26-00 <br /> Flow 39.212A 27.7 12.4 12.4 10 12.4 <br /> Vacuum 52 49 1 39 42 41 142 26 <br /> PID 60 10683 1 316 229.4 448 1499 519 <br /> HW-1 Flow in scfm ,Vacuum in inches of water),and PID in parts per million <br /> Sample Date 12-30-99 1 1.27-00 3-30-00 1 4-28-00 5-23-00 6-15-00 9-26-00 <br /> Flow 24.8 Closed 11.1 Closed Closed Closed 12.4 <br /> Vacuum 6 1 Closed 2.6 Closed I Closed I Closed I 2.0 <br /> PID 6.5 Closed 0 1 Closed I Closed IClosed 6.1 <br /> HW-5 Flow in scfm ,Vacuum in inches of water),and PID in parts per million <br /> FS-ample Date 12-30-99 1 1-27-00 3-30-00 4-28-00 5-23-00 6-15-00 9-26-00 <br /> Flow 21.5 Closed Trace Closed Closed Closed 1 12.4 <br /> Vacuum 6 Closed 29.5 Closed Closed Closed 1 6.0 <br /> PID 8.2 Closed 0 Closed Closed Closed 1 5.8 <br /> HW-8 Flow in scfm ,Vacuum in inches of water), and PID in parts Ler million) <br /> DS le Date 12-30-99 1-27-00 3-30-00 4-28-00 5-23-00 6-15-00 9-26-00 <br /> Flow Closed 21.5 20.0 24.8 24.8 24.8 12.4 <br /> Vacuum Closed 8.5 4.7 5.5' 5.2 5.2 2.0 <br /> PID -dosed 99 6.6 9.6 14.5 14.8 14.4 <br /> MW-3 Ground water sample analytical results inµg/1. DTW(depth to water) in feet <br /> below surface rade bs <br /> M 7.3 DTW TPH-G Benzene Toluene Ethyl-benzene Xylenes <br /> No <br /> 1999 16.43 210,000 16,000 58,000 3,800 127,000 <br /> 4,000 <br /> Feb 2000 15.97 220,000 12,000 45,000 2,800 8,000 <br /> Ma 2000 13.51 200,000 7,000 48,000 3,400 <br /> Au 2000 14,81 120000 3 200 16,000 1,100 7,000 <br /> MW-9 Ground water sam le anal 'cal results in /1 <br /> E <br /> 9 DTW TPH-G Benzene Toluene Eth 1-benzene1999 15.60 14,000 33 4.0 620 2,100 <br /> 000 15.22 28,000 180 400 1,6002000 13.25 24,000 37 130 14002000 14.20 24,000 31 38 1,000 3,500 <br /> The groundwater has risen in this area by approximately 2 feet since November 1999. The work plan <br /> stated that the area of vadose zone available for the soil vapor extraction(SVE) system has <br /> decreased. The work plan proposed installing two ground water extraction wells and conducting an <br /> 8-hour step draw down test and a 24-hour constant rate pump test to evaluate the feasibility of 1) <br /> direct removal of dissolved contamination mass,and 2) depressing the ground water table to increase <br /> the vadose zone. The work plan proposed that by increasing the vadose zone the SVE would be <br /> enhanced. <br />