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2,2 Groundwater Elevation and Well Depth Data
<br /> I•
<br /> Free product was not observed among the wells, based on the measurements
<br /> obtained utilizing the oil/water interface probe
<br /> Groundwater elevations decreased approximately 2 56 feet from the previous
<br /> event During this event, the average depth to groundwater in the wells was
<br /> 47 60 feet bgs (-30 92 feet msl) The elevations ranged from-3135 to-30 40
<br />' feet msl The groundwater flow direction was easterly at a gradient of
<br /> approximately 0 003 feet per linear foot
<br /> eZ.'- e9"
<br /> The well depth measurements at wells MW-5, MW-7, SP-1, SP-5, and SP-0
<br /> a N
<br /> indicated that the wells have been silted-in Wells MW-5, MW-7, and SP-1 G1sa�
<br /> will be redeveloped, if possible, during the next quarterly event Wells SP-5 60J
<br /> 0,14
<br /> and SP-6 will not be developed at this time, since the wells will no longer be
<br /> sampled as approved during the November 10, 2005 meeting with SJCEHD
<br /> 2.3 BTEX and TPH-g Analytical Results
<br /> BTEX and/or TPH-g were detected in the groundwater samples from wells
<br /> MW-1, MW-5, MW-7, MW-11, SP-1, SP-2, SP-6, PZ-1, and PZ-2 11
<br /> M The current BTEX concentrations were compared to the California Drinking
<br /> Water Maximum Contaminant Levels (MCL)s The MCLs in groundwater
<br /> are benzene (1 µg/L), toluene (150 µg/L), ethylbenzene (300 µg(L), and
<br /> ' xylenes (1,750 µg/L) Based on the current groundwater monitoring data, the
<br /> MCL for benzene was exceeded in wells MW-1, MW-7, MW-11, SP-1, PZ-1,
<br /> and PZ-2 The MCL for toluene was exceeded in wells MW-1 and SP-1 The
<br /> MCL for ethylbenzene was exceeded in wells MW-Mhd PZ-1 The MCL for
<br /> ' xylenes was exceeded in wells MW-1 and SP-1 r d 17t
<br /> ' 2.4 Oxygenates and 1,2-DCA Analytical Results
<br /> The analytes TBA, DIPE, ETBE, and/or TAME were detected in wells MW-
<br /> 1, MW-5, MW-7, SP-1, and PZ-1 The MCL for MTBE in groundwater is 13
<br /> µg/L However, MTBE was not detected in any of the wells
<br /> The analyte 1,2-DCA was detected in wells MW-1, MW-5, MW-7, MW-8,
<br /> MW-12, and SP-5 1,2-DCA was a component of gasoline during the 1980's
<br /> The MCL for 1,2-DCA in groundwater is 0 5 µg/L Based on the current
<br /> groundwater monitoring data, the MCL for 1,2-DCA has been exceeded in
<br /> wells MW-1, MW-5, MW-7, MW-8, MW-12, and SP-5
<br /> J
<br /> 7
<br /> Quarterly Groundwater Monitoring Report
<br /> 4th Quarter-November 2005
<br /> Prepared for SARA LEE BAKERY GROUP,INC Prepared by PSC Environmental Services
<br /> Invmt1gatrve and Quarterly Report 14th Quarterly Report 11_2005 doc February 24,2006
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