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' 9110 Thornton Road, Stockton, California April 27, 1994
<br /> The Southland Corporation Page 4
<br /> During the test on MW-1, the followingparameters were� e monitored and documented
<br /> ' ■ Applied vacuum at the wellhead, and induced vacuum at wells in the vicinity of
<br /> MW-1 (MW-4, PW-3, MW-3, VP-4, 17A, VP-3, VP-2, MW-2, VP-1 and MW-5), in Inches
<br /> of water
<br /> ' • Velocity of extracted air with a Kurz Model 440 air velocity meter in feetsecon er
<br /> (ft/sec) P d
<br /> ' Percent lower explosive limit (LEL) of gasoline and oxygen concentration (percent
<br /> volume) in extracted air with a portable combustible gas/oxygen meter
<br /> During the tests on the remaining wells MW-2 through MW-5, MW-8, MW-10, MW-12, PW-2 and
<br />' PW-3, and VP-1, VP-2 and VP-3, only the following parameters were monitored and documented
<br /> Vacuum at the test wellhead in inches of water with a magnehelic gauge
<br /> ■ Percent lower explosive limit (LEL) of gasoline and oxygen concentrationercent
<br /> gas/oxygen g / meter
<br /> volume) in extracted air with a portable combustible o (P
<br /> Two samples of extracted air were collected from wells MW-1, MW-4, VP-2 and PW-3 Only one
<br />' sample was collected from the remaining wells (MW-2, MW-3, MW-5, MW-8, MW-10, MW-12, VP-1,
<br /> VP-3 and PW-2) that were tested The samples were labeled and shipped to GTEL Environmental
<br /> Laboratories, Inc in Concord, California for the analysis of BTEX and TPH-G using EPA methods
<br /> 5030/8020/modified 8015
<br /> Results of Soil Vapor Extraction Testing
<br /> As explained in the previous section, MW-1 was tested for a longer penod of time During the test
<br />' on MW-1, induced vacuum at the observation points was monitored and documented The data
<br /> were obtained to determine the radius of capture of vapor extraction Applied vacuum at the
<br /> wellhead was approximately 20 5 inches of water (1W) Induced vacuum at wells MW-4, PW-3,
<br />' MW-3, VP-4, 17A, VP-3, VP-2, MW-2, VP-1 and MW-5 located at distances of 15, 24, 27, 28, 40, 40,
<br /> 49, 60, 77 and 120 feet, respectively, ranged from 1 2 to 0 1 1W Total petroleum hydrocarbon
<br />' concentration in the extracted air was two percent LEL Velocity of extracted air in the 4-inch vapor
<br /> extraction piping was 950 feet per minute (ft/min) Oxygen concentration in the extracted air was
<br /> 12 2 percent volume
<br />' Wells MW-4, PW-3, VP-4, MW-3, VP-3, VP-1, VP-2 MW-2 PW- _
<br /> 2, MW-8, MW-10, MW 12 and MW-5
<br /> were also tested, however, during the tests on these wells, induced vacuum was not monitored due
<br /> GROUNDWATER
<br />' L-1=1 TECHNOLOGY
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