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Site History
<br /> TimeHighway 88
<br /> Time , Lockefard CA
<br /> Oil Property No 04049
<br /> Analyses Identified elevated concentrations of hydrocarbons in the samples colt
<br /> gasoline, 304 ppb benzene, 1,410 ppb totuene, 1,020 collected from MW-1 (6,570 ppb
<br /> benzene, 38 3 ppb toluene, 5 3 ppb ethylbenzene, and 24.1 thylbenzene), iVtW-2 (875 ppb gasoline, 23 9 ppb
<br /> ppb benzene, 0 7 Ppb toluene, 35 1 Ppb xylenes}, and MW-3 (935 ppb gasoline, 235
<br /> hydrocarbons were found in the samples collected rom MW_q 342 ppb xylenes
<br /> ethylbenzene, and 1 8 ) Lower concentrafions of
<br /> 3 6 ppb Xylenes), ppb xylenes), MW-5 (102 ppb gasoline 2 Ppb gasoline, 44 3 ppb benzene, 8 6 ppb
<br /> } mW-6(166 ppb gasoline, 18 8 ppb benzene, 2 0 ppb benzene, 0 8 ppb ethylbenzene, and
<br /> MW-8 {1 2 ppb benzene and 0 5 ppb ppb ethylbenzene, and 19 2 b
<br /> Hydrocarbons were not detected in the samples}collected, and MWfr m MW_7 or MW-10 pp xylenes),
<br /> MTBE were detected in the groundwater samples collected from( ppb gasoline and 1 6 ppb toluene)
<br /> (12 6 ppb), however, rt was not detected in any of the other samples Low concentrations of
<br /> 4
<br /> M!N 2 (5 4 ppb), MW-3 {9 3 ppb) MW.4
<br /> The highest concentrations of hydrocarbons appear to remain onsite In the vicinity of the pump islands
<br /> 1 and MW-3) The groundwater plume does not appear to be migrating to any great
<br /> to the October 1997 sampling event, groundwater concentrations decreased in MW-1, MW-3, Mw-S, MW-6,
<br /> {MW-
<br /> and MW-g, white they remained relatively unchanged in the remainder of the wells extent When compared
<br /> A copy of SEGOR`s "Quarterly Monitoring Report, January „
<br /> forwarded to the appropriate regulatory agencies on May 4 19a March 1998 dated Apel 15, 1998 was
<br /> �rmh 98
<br /> � ra i iii T
<br /> On March 19 and 20, 1998, feasibility testing
<br /> lwas conducted to evaluate the effectiveness-impacted soils at the subject site
<br /> in remediating hydrocarbonof vapor extraction
<br /> Tests were conducted at eight separate wells
<br /> oxygen in subsurface, the Internal combustion engine was unable to produce a vacuum exceeding 4 inches
<br /> Of water at any well, therefore Induced vacuum could not on engine Due to low
<br /> Based on flow rates obtained during testing and their understanding of site conditions
<br /> actual radius-of-influence at each well to be aPproxrmat ! be measured at any of the surrounding wells
<br /> e y 50 feet , SEC estimates the
<br /> A summary of pilot test data follows
<br /> W--C-L2. $ r� eenerl in p+�
<br /> Resu in
<br /> 1 10 -40 feet g it a~f r Mb ntr� in, at s
<br /> 2 in water 12 5 cfm a ova Rate
<br /> W-2 5 -45 feet 763 ppmv
<br /> 3 8 lbs/day
<br /> 2 in water 12 6 cfm 7,240 ppmv
<br /> 1N_3 5-40 feet 6 5 Ibslday
<br /> 2 5 in water 19 9 cim 179,00D ppmv
<br /> W-4 5-30 feet 1,425 Ibslday
<br /> 3 Sin water 14 2 cfm
<br /> W-5 70.30 feet 3 in water 3,130 ppmv i 7 i Ibslday
<br /> W-6 10-30 feet 26 9 cfm 221 ppmv
<br /> 3 in water 99 9 Cim 2 4 lbs/day
<br /> W-7 25-56 Feet 2)n water 139 ppmv 1 1 lbs/day
<br /> W-8 25-56 feet 19 6 dm 2,670 ppmv
<br /> 2 in water 20 7 cfm20 9 lbs/day
<br /> 23 000 ppmv 175 Ibslday
<br /> SECOR calculated the initial mass removal rates for each well using the average flaw r
<br /> ate observed during
<br /> testing and the analytical results of vapor samples collected near the end of each test
<br /> Based on the results of the pilot test, it appears as though vapor extraction will be a
<br /> addressing hydrocarbon-impacted soils at the subject site The majority
<br />` influenced by vapor extraction from W-1 of impacted saris can through W_g with an assumed 50400t feasible technology far
<br /> oot radius of influenceost likely be
<br /> 0 f
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