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Quarterly Groundwater Monitoring Report- First Quarter 2016
<br /> L&M Operable Unit- West Weber Avenue and North Lincoln Street, Stockton, CA
<br /> April 29, 2016
<br /> 2.0 Groundwater Monitoring and Sampling
<br /> 2.1 SITE INFORMATION
<br /> Current phase of project: Groundwater monitoring and sampling
<br /> Quarterly:
<br /> MW-9, MW-16 through 20, MW-42, MW-43, MW-46
<br /> through MW-52, MW-54, MW-55, MW-57, MW-59, MW-60,
<br /> MW-62 through MW-74, 2AMW-12 through 2AMW-14
<br /> L&M Operable Unit frequency of Semi-annually (1 Q/3Q):
<br /> monitoring and sampling: MW-21, MW-22, MW-31, MW-56, MW-58, MW-61
<br /> Annually (3Q):
<br /> MW-23 through MW-28, MW-34, MW-35, MW-44, MW-45
<br /> (MW-9, MW-18 through MW-23, MW-25, MW-28, MW-31,
<br /> MW-34, MW-45, 2AMW-12 through 2AMW-14;
<br /> additionally sampled for Arsenic during 34
<br /> Sheen:
<br /> MW-4, MW-10, 2AMW-13, MW-19, MW-39, MW-17,
<br /> Have separate-phase hydrocarbons MW-47, and MW-50.
<br /> (SPH) historically been found on-
<br /> site?: SPH:
<br /> 2AMW-14, MW-21, DIRE-1 through DPE-12, MW-40,
<br /> MW-43, MW-48, MW-49, and MW-52
<br /> See Appendix D for historical analytical data SPH
<br /> Historic range in DTW (ft below top of
<br /> casing [TOC] from February 1992 to 6.91 (MW-23, 2Q06) to 45.12 (MW-50, 4Q11)
<br /> January 2016 :
<br /> Water supply wells within a 2,000-foot No known water wells within 2,000 feet of Site. Stantec
<br /> radius and their respective direction: Department of Water Resources Survey 2013.
<br /> On-Site:
<br /> Soil Vapor Extraction (SVE); Groundwater Extraction and
<br /> Current remediation techniques: Treatment (GWET) system-Not operational
<br /> Off-Site:
<br /> Product recovery skimmers stem-Operational
<br /> 2.2 WORK PERFORMED
<br /> Stantec contracted Gettler-Ryan Inc. (G-R) to gauge 48 and sample 33 groundwater monitoring
<br /> wells between January 11 through 13, 2016. Wells 2AMW-13, MW-19, MW-47 and MW-52 were
<br /> monitored, but not sampled due the presence of Sheen or SPH in the wells. Wells 2AMW-14,
<br /> MW-43, and MW-48 through MW-50 were neither monitored nor sampled during 1 Q16 due to the
<br /> >� presence of product recovery skimmers in the wells. These wells will be monitored and sampled
<br /> ® Stantec 4
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