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• contained less than 1 foot of water are Interpreted to be dry and are indicated as "dry" on Figure 3 Since
<br /> wells VW-1 and VW-6 are screened in a shallower interval than the other upper water bearing zone wells,
<br /> these two wells were not used in contouring The groundwater level in VW-3 appeared anomalous and
<br /> this well was not used in contour construction Groundwater flow was generally to the south-southeast at
<br /> a gradient of 0 103 ft/ft Groundwater flow in the upper water bearing zone has been to the south,
<br /> south-southeast, and toward the southwest during previous quarters
<br /> GRO, benzene, and MTBE were reported In well VW-6 GRO was also reported in well MW-8, GRO and
<br /> benzene were reported in wells MW-13, VW-2, and VW-3, and GRO and MTBE were reported In well
<br /> VW-5 The highest concentration of GRO (26,000 pg/L) was reported in well VW-2, and the highest
<br /> concentrations of benzene (1,900 pg/L) and MTBE (170 jig/L) were reported in well VW-6 1,2-DCA was
<br /> reported in wells MW-8 (70 µg/L), VW-5 (0 78 µg/L), and VW-6 (88 pg/L) TBA, TAME, DIPE, ETBE,
<br /> EDB, or ethanol were not reported in any of the upper zone wells Analytical results for the first quarter
<br /> 2005 are generally consistent with previous quarters GRO, benzene, and MTBE analytical data for the
<br /> samples collected on March 15, 2005, are presented in Figure 5 Analytical data were submitted to the
<br /> State Water Resources Control Board as required by AB2886 The electronic delivery receipt Is attached
<br /> in Appendix C
<br /> Lower Water Bearing Zone Sand Zone 2
<br /> During the site visit conducted on March 3, 2005, free product was measured in well MW-1 at a thickness
<br /> of 0 02 feet, and during the site visit on March 14, 2005, free product was measured in well MW-15 at a
<br /> thickness of 0 02 feet Approximately 2 gallons of product/water mixture were manually bailed on March
<br /> 14, 2005, and stored In a properly labeled DOT approved drum pending disposal Approximately 200
<br /> gallons of product/water mixture has been manually balled to date Product thickness measurements and
<br /> volumes of liquid bailed are summarized In Table 1
<br /> At the time of the first quarter 2005 monitoring event, groundwater levels had decreased 0 04 feet in well
<br /> MWA, and Increased between 0 05 and 0 18 feet In wells MW-10, MW-12, and MW-15 since the previous
<br /> monitoring event (December 20, 2004) Depth-to-water measurements were normalized to mean sea
<br /> level (MSL) and used to construct a groundwater elevation contour map (Figure 4) Wells that contained
<br /> less than 1 foot of water are interpreted to be dry and are indicated as "dry" on Figure 4 Groundwater
<br /> flow was generally to the east at a gradient of 0 036 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 /> (69,000 µg/L) and benzene (9,600 pg/L) were reported in well MW-12 MTBE, TBA, TAME, DIPE, ETBE,
<br /> EDB, 1,2-DCA, or ethanol were not reported in any of the lower zone wells Analytical results for the first
<br /> quarter 2005 are generally consistent with previous quarters GRO, benzene, and MTBE analytical data
<br /> for the samples collected on March 15, 2005, are presented in Figure 5 Analytical data were submitted to
<br /> the State Water Resources Control Board as required by AB2886 The electronic delivery receipt is
<br /> 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 first quarter 2005 are consistent with historical data
<br /> SVE System Operation and Maintenance
<br /> During December 2004 and January 2005, Stratus replaced the two 200 cfm King, Buck, & Associates
<br /> SVE systems which operated at the site between March 2004 and November 2004, with a 500 cfm
<br /> Solleco thermal oxidizer The performance and operation summary of the two 200 cfm King, Buck, &
<br /> Associates SVE systems are Included in Appendix D
<br /> K Wp-Arco for UR5161001Quarterly120051Arco_6100_1 Q05 doc STRATUS
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