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Stantec
<br /> 2010 TIDEWATER STOCKTON WORK PLAN
<br /> 2.0 Groundwater Summary
<br /> 2.1 GROUNDWATER MONITORING AND SAMPLING
<br /> Groundwater monitoring events have been completed at the site consistently from May 2002
<br /> through the present. Quarterly groundwater sampling of 14 shallow wells (A-Zone) (MW-9,
<br /> 2AMW-12, MW-18 through MW-23, MW-25, MW-28, MW-30, MW-31, MW-33, MW-34 and
<br /> MW-45), 15 B-Zone wells (MW-16, MW-24, MW-26, MW-27, MW-29, MW-32, MW-35, MW-42,
<br /> MW-44, MW-51 and MW-56 through MW-60, 8 C-Zone wells (MW-54, and MW-61 through
<br /> MW-67), and 8 D-Zone wells (MW-55, and MW-68 through MW-74), was performed by Stantec
<br /> during the most recent groundwater sampling event (fourth quarter 2009). Groundwater
<br /> monitoring and sampling activities are performed as required by MRP No. R5-2004-0820
<br /> (Appendix-B), which was issued by the RWQCB on May 6, 2004.
<br /> On behalf of the RDA, Wallace-Kuhl is responsible for monitoring and sampling at the portion of
<br /> the South Shore Parcels identified as the MOU and the UOU. Seven shallow wells, MW-3,
<br /> MW-06R, MW-7, 2AMW-15, 2BMW-1, MW-37, and MW-38 are located on the MOU and UOU
<br /> and are gauged and sampled by Wallace-Kuhl. Stantec's groundwater monitoring and sampling
<br /> activities are usually conducted concurrently with Wallace-Kuhl, however, since April 2008
<br /> Wallace-Kuhl has only gauged wells for depth to water and has not sampled any wells. Wells
<br /> MW-36 and 3MW-1R, which were previously part of the MOU/UOU MRP, were destroyed by
<br /> Clayton on April 5, 2004 due to the development of the adjacent parcel. Well MW-6 was
<br /> destroyed by Golden State Environmental on June 21, 2007 due to excavation and construction
<br /> activities in the area; MW-06R was reinstalled in close proximity in November 2008. Wells
<br /> MW-5, MW-8, MW-11, and MW-39 were abandoned by the RDA's consultant Treadwell & Rollo
<br /> during 4Q08.
<br /> Groundwater monitoring of L&M OU wells is performed by Stantec. Collected groundwater
<br /> samples are submitted to a state certified laboratory and are analyzed for the following:
<br /> • TPHd and TPHo by Environmental Protection Agency (EPA) Method 8015M with silica
<br /> gel cleanup.
<br /> • TPHg; benzene, toluene, ethylbenzene, and total xylenes (BTEX compounds); fuel
<br /> oxygenates (MtBE, di-isopropyl ether [DIPE], ethyl tertiary butyl ether [EtBE], TBA,
<br /> tertiary amyl methyl ether [TAME], methanol, and ethanol); and volatile organic
<br /> compounds (VOCs) by EPA Method 8260B
<br /> • Semi-volatile organic compounds (SVOCs) by EPA Method 8270C
<br /> 2.5
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