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SUMMARY AND RECOMMENDATIONS
<br /> 1
<br /> Groundwater-monitoring has been conducted at this facility since 1987 to evaluate
<br /> 1 groundwater quality A summary of the current site conditions and a
<br /> recommendation for subsequent work are as follows
<br /> ' • During this event, the average depth to groundwater among the wells was
<br /> 47 60 feet bgs (-30 92 feet msl), which indicates an approximate 2 56 foot
<br /> decrease in elevation from the previous event The groundwater flow was Z 2
<br /> generally easterly at a gradient of approximately 0 003 feet per linear foot A '
<br /> 0 The total well depth measurements indicated that an appreciable amfit of
<br /> silt may have infiltrated wells MW-5, MW-7, SP-1, SP-5, and SP-6 Wells
<br /> MW-5, MW-7, and SP-1 will be redeveloped, if possible, during the next
<br /> quarterly event Wells SP-5 and SP-6 will no longer be sampled
<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
<br /> ' • The current BTEX concentrations were evaluated against the California
<br /> Drinking Water MCLS Based on the current groundwater monitoring data,
<br /> the MCL for benzene was exceeded in wells MW-1, MW-7, MW-11, SP-1,
<br /> PZ-1, and PZ-2 The MCL for toluene was exceeded in wells -1 and
<br /> SP-1 The MCL for ethylbenzene was exceeded in wells MW-AanPZ-1
<br /> The MCL for xylenes was exceeded in wells MW-1 and SP-1 Vlp"
<br /> ® The analytes TBA, DIPE, ETBE, and/or TAME were detected in wells
<br /> MW-1, MW-5, MW-7, SP-1, and PZ-1
<br /> • The analyte 1,2-DCA was detected in wells MW-1, MW-5, MW-7, MW-8,
<br /> MW-12, and SP-5 Based on the current groundwater monitoring data, the
<br /> MCL for 1,2-DCA has been exceeded in wells MW-1, MW-5, MW-7, MW-8,
<br /> MW-12, and SP-5
<br /> Based on the results of the November 2005 sampling event, it appears that further rtr+�
<br /> groundwater remediation is warranted at the site PSC recommended that sampling-Q �
<br /> from wells MW-3 and MW-6 be discontinued, wells MW-5, MW-7, and SP- be
<br /> ' redeveloped, if possible, during the next quarterly event, and well MW-10 be sample G�so PZ- 2
<br /> on an annual basis (during the third quarter) SJCEHD agreed to the r L,
<br /> recommendations in correspondence dated December 13, 2005 The SJCEHD also
<br /> tapproved the discontinuation of sampling wells SP-3, SP-4, SP-5, and SP-6 during -
<br /> the November 10, 2005 meeting SJCEHD also recommended that the April 2003
<br /> Site Conceptual Model be modified and the October 2004 Fate and Transport Models
<br /> be revised The revisions will be submitted in subsequent quarterly reports
<br /> 1 Quarterly Groundwater Monttorulg Report
<br /> 4th Quarter-November 2005
<br /> Prepared for SARA LEE BAKERY GROUP,INC Prepared by PSC Environmental Services
<br /> 1 Investrgarrve and Quarterly Report 14th Quarterly Report 11.2005 doe February 24,2006
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