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Mr. Marty Hartzell . Page 4 of 10 • of water duringthe last 90 minutes of the test. Hydrocarbon vapor concentrations measured with the Y P PID ranged from 136 to 273 ppm. Low induced vacuums(0.3 —0.4 inches of water)were observed in wells VWlb and VW2 during most of the test. TPHg was measured at a concentration of 950 ug/l in the influent vapor sample collected from this well. '• The IC Engine was also operated on VWIa for 9 hours on December 17, 2001. Flow rates ranged from 35-40 cfm during the first 2-3 hours of operation, then fluctuated between 10 and 40 cfin during the last 6-7 hours of operation. The applied vacuum was 70 inches of water at startup and gradually decreased to 30 inches of water at the end of the day. Hydrocarbon vapor concentrations with the PID ranged from 317 to 436 ppm. The TPHg concentration in the influent vapor sample collected almost 6 hours after startup on December 17 was 1,400 ug/l (1,300 ug/1 in a duplicate sample). Table 2 lists the physical data measured during the VET. Analytical data are summarized in Table 3. Laboratory data sheets and chain of custody documentation are included in Attachment D. Vapor Test Well VWlb This well is screened from 38 — 42 feet in what was logged as a silt, which corresponded to the zone with the greatest concentrations of gasoline in soil during the initial field investigation. During the VET using test well VWlb as the extraction well, flow rates ranging from 15 to 18 cubic feet per minute (cfin) were achieved at applied vacuums ranging from 30 to 33 inches of water during the first hour of the test. During the last hour of the test, flow rates fluctuated from 20 to 40 cfin at applied vacuums of 30 to 40 inches of water. Hydrocarbon vapor concentrations measured with the PID ranged from 80 to 199 ppm. Induced vacuums of 0.2 — 0.8 inches of water were observed in wells VWla and VW2. The TPHg concentration in the influent vapor sample from well VWlb was 700 micrograms per liter (Ug/l)- The IC Engine was also operated on VW l b for 7.5 hours on December 14, 2001. Flow rates ranged from 45-50 cfin during the first 5.5 hours of operation to 35-40 cfin during the last 2 hours of operation. Applied vacuums ranged from 60-70 inches of water at startup to 48 inches of water at the end of the day, and induced vacuums of 0.8 to 1.2 inches of water were measured in observation wells VWIa and VW2. Hydrocarbon vapor concentrations with the PID ranged from 80 to 178 ppm. The TPHg concentration in the influent vapor sample collected 3 hours after startup on December 14 was 720 ug/l. I Table 2 lists the physical data measured during the VET. Analytical data are summarized in Table 3. Laboratory data sheets and chain of custody documentation are included in Attachment D. Vapor Test Well VW2 This well is screened across the primary range of impacted soil from 24 — 44 feet. During the test on VW2, flow rates were measured at 20 to 40 cfm at applied vacuums of 40 to 50 inches of water column during the first 30 minutes of the test. flow rates during the last 90 minutes of the test were measured at 2 to 8 cfrn at applied vacuums of 30 to 40 inches of water column. Hydrocarbon vapor concentrations measured with the PID ranged from 270 to 336 ppm. Low vacuums (0.5-0.8 inches of G:wyawRotnu�7Fgonn�efFtrooreslvsrxrraoc