|
• was reported in wells MW-8 (98 µg/L) and VW-3 (37 pg/L) TBA, TAME, DIPE, ETBE, or ethanol were not
<br /> reported in any of the upper zone wells Analytical results for the second quarter 2005 are generally
<br /> consistent with previous quarters GRO, benzene, and MTBE analytical data for the samples collected on
<br /> June 21, 2005, are presented in Figure 5 Analytical data were submitted to the State Water Resources
<br /> Control Board as required by A92886 The electronic delivery receipt is attached in Appendix C
<br /> Lower Water Beanng Zone (Sand,Zone 2)
<br /> During the site visits conducted during the second quarter 2005, free product was measured in well MWA
<br /> at thicknesses of 0 02 and 0 04 feet Free product was also measured in well MW-15 at thicknesses
<br /> ranging from 0 10 and 0 22 feet Approximately 20 gallons of product/water mixture were manually bailed
<br /> during the second quarter 2005 from wells MWA and MW-15, and stored in a properly labeled DOT
<br /> approved drum pending disposal Approximately 220 gallons of product/water mixture has been manually
<br /> bailed to date Product thickness measurements and volumes of liquid bailed are summarized in Table 1
<br /> At the time of the second quarter 2005 monitoring event, groundwater levels had decreased between 0 03
<br /> and 0 44 feet in wells MW-1, MWA 2, and MWA 5, and increased 0 15 feet in well MWA0 since the
<br /> previous monitoring event (March 14, 2005) Depth-to-water measurements were normalized to mean
<br /> sea level (MSL) and used to construct a groundwater elevation contour map (Figure 4) Wells that
<br /> contained less than 1 foot of water are interpreted to be dry and are indicated as "dry" on Figure 4
<br /> Groundwater flow was generally to the east at a gradient of 0 031 ft/ft Groundwater flow has been to the
<br /> east-southeast and east during previous quarters
<br /> GRO and benzene were reported in wells MW-10 and MW-12 The highest concentrations of GRO
<br /> (90,000 pg/L) and benzene (14,000 pg/L) were reported in well MW-12 1,2-DCA (130 pg/L)was reported
<br /> in well MW-10 MTBE, TBA, TAME, DIPE, ETBE, EDB, or ethanol were not reported in any of the lower
<br /> • zone wells Analytical results for the second quarter 2005 are generally consistent with previous quarters
<br /> GRO, benzene, and MTBE analytical data for the samples collected on June 21, 2005, are presented in
<br /> Figure 5 Analytical data were submitted to the State Water Resources Control Board as required by
<br /> AB2886 The electronic delivery receipt is attached in Appendix C
<br /> Domestic Well
<br /> GRO, BTEX, MTBE, TBA, TAME, DIPE, ETBE, EDB, 1,2-DCA, or ethanol were not reported in the
<br /> domestic well GRO, benzene, and MTBE analytical data are presented in Figure 5 These analytical
<br /> results for the second quarter 2005 are consistent with historical data
<br /> System Description
<br /> Soil Vapor Extraction System
<br /> The Solleco 500 cfm SVE system consists of a 500 cfm rated thermal oxidizer with a 40 hp liquid ring
<br /> blower Upon system start-up (May 16, 2005), petroleum hydrocarbon laden soil vapors were extracted
<br /> from wells VW-1, VW-3, VW-4, VW-8, VW-14, MW-2, MW-8, and MW-9 using the 40 hp blower package
<br /> capable of producing up to 28 "Hg vacuum The extracted soil vapors were abated in the thermal oxidizer
<br /> prior to discharge to the atmosphere The SVE system has a built-in hour meter that is used to determine
<br /> the operational uptime Sample ports (influent, system-influent, and effluent) are designated to collect air
<br /> samples The results of the air samples are used to calculate the destruction efficiency of the system
<br /> •
<br /> K IHp-Arco for URS161001QuanerlyV0051Arco_6100 2Q05 doe STRATUS
<br />
|