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. Second Quarter 1993 Monitoring and Sampling Report July 30, 1993
<br /> Southland Site No 20680, 9110 Thornton Road, Stockton, CA 4
<br /> analytical result for the groundwater sample collected from monitoring well MW-1, which reported
<br /> concentration of STEX (1 0 parts per billion [ppb], i 10 ppb, 10 ppb, and 3 0 ppb, respectively) and
<br /> TPH-G (250 ppb) These results for well MW-1 are higher than the concentrations previously
<br /> detected and may be the result of surface Infiltration from the parking lot area The well is located at
<br /> a topographically low area of the parking lot. Copies of the analytical laboratory reports are
<br /> Included in Attachment 4 The historical TPH-G laboratory results for groundwater samples collected
<br /> from the monitoring and pumping wells are presented in Attachment 5 The historical TPH-G
<br /> laboratory results for groundwater samples collected from the domestic wells are presented in
<br /> Attachment 6
<br /> Groundwater samples were collected from domestic wells 8958 (Kingdom Hall), 9036, 1912, 9140,
<br /> 9156, and 9172 (Ivy Motel) on April 30, May 28, and June 30, 1993 Analytical results of
<br /> groundwater samples collected from the domestic wells did not report TPH-G or BTEX
<br /> concentrations above MDLs The analytical results of groundwater samples collected during this
<br /> quarter are summarized In Tables 3 and 5 The addresses and owners of routinely sampled
<br /> domestic wells are listed in Table 4 Copies of the analytical laboratory reports are included In
<br /> Attachment 4 The historical TPH-G laboratory results for groundwater samples collected from the
<br /> monitoring and pumping wells are presented in Attachment 5 The historical TPH-G laboratory
<br /> . results for groundwater samples collected from the domestic wells are presented in Attachment 6
<br /> CONCLUSIONS AND RECOMMENDATIONS
<br /> Groundwater monitoring data recorded on June 30, 1993, indicates that groundwater levels have
<br /> Increased approximately 1 5 feet in the monitoring wells at the site The apparent groundwater flow
<br /> direction beneath the site Is generally to the east
<br /> With one exception, laboratory results of the samples collected on June 30, 1993, from monitoring
<br /> wells MW-1, MW-5, MW-7, MW-8, MW-9, MW-13, MW-15A through MW-15C, MW-16, MW-17A
<br /> through MW-17C, MW-18 through MW-20, former pumping wells PW-1 through PW-3, and former
<br /> recovery well RW-1 reported BTEX and TPH-G concentrations below MDLs in each sample tested
<br /> The one exception is the analytical results of the groundwater samples collected from monitoring
<br /> well MW-1 which reported detectable concentrations of BTEX and TPH-G Laboratory results of
<br /> groundwater samples collected from domestic wells 8968, 9036, 1912, 9140, 9156, and 9172 on April
<br /> 30, May 28, and June 30, 1993, reported BTEX and TPH-G concentrations below MDLs for all
<br /> samples analyzed
<br /> Based on the results of assessment and remediation activities conducted at the site to date and on
<br /> the results of the sod confirmation boring program conducted at the site in January and February
<br /> 1993, Groundwater Technology requested site closure, submitting a Closure Report, dated May 21,
<br /> 12118029 020
<br /> EDGROUNDWATER
<br /> TECHNOLOGY, INC
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