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E C 0 R - 11111A
<br /> • 4.0 FIRST QUARTER 2008 MONITORING AND SAMPLING
<br /> 4.1 Groundwater Monitoring and Sampling Procedures
<br /> Quarterly groundwater sampling of 15 shallow wells (A-Zone) (MW-4, MW-9, 2AMW-12,
<br /> MW-18, MW-20, MW-21, MW-22, MW-23, MW-25, MW-28, MW-30, MW-31, MW-33, MW-34
<br /> and MW-45), 11 B-Zone wells (MW-24, MW-26, MW-27, MW-29, MW-32, MW-35, MW-41,
<br /> MW-42, MW-44, MW-51, and MW-53), one C-Zone well (MW-54), and one D-Zone well
<br /> (MW-55), was performed by SECOR between January 21 and January 25, 2008. Groundwater
<br /> monitoring and sampling activities were performed as required by MRP No. R5-2004-0820
<br /> (Appendix-A), which was issued by the RWQCB on May 6, 2004. MRP No. R5-2004-0820 is
<br /> summarized in Table 1.
<br /> Groundwater monitoring and sampling activities were conducted concurrently with Wallace-Kuhl
<br /> during the first quarter 2008. On behalf of the RDA, Wallace-Kuhl is responsible for monitoring
<br /> and sampling at the portion of the South Shore Parcels identified as the MOU and the UOU.
<br /> Ten shallow wells, MW-3, MW-5, MW-7, MW-8, MW-11, 2AMW-15, 2BMW-1, and MW-37
<br /> through MW-39 are located in the MOU and UOU and were gauged and sampled by
<br /> Wallace-Kuhl. Wells MW-36 and 3MW-1R, which were previously part of the MOU/UOU MRP,
<br /> were destroyed by Clayton on April 5, 2004 due to the development of the adjacent parcel. Well
<br /> MW-6 was destroyed by Golden. State Environmental on June 21, 2007 due to excavation and
<br /> construction activities in the area.
<br /> • Groundwater monitoring wells were sampled according to the requirements stated in MRP No.
<br /> R5-2004-0820, with the exception of the following:
<br /> • Shallow wells MWA and MW-2 have not been sampled since September 1999 and July
<br /> 1990, respectively. There is no evidence that these wells still exist, and therefore, these
<br /> wells are considered lost.
<br /> • Wells MW-6, MW-36 and 3MW1-R were previously abandoned.
<br /> 4.2 Laboratory Analysis
<br /> , s
<br /> Groundwater monitoring of L&M OU wells during the first quarter 2008 was performed by
<br /> SECOR. SECOR's standard procedures for groundwater monitoring and sampling are
<br /> presented in Appendix B. Groundwater samples collected from each well by SECOR were
<br /> submitted under chain-of-custody (COC) documentation to Kiff Analytical, a state certified
<br /> laboratory located in Davis, California and were analyzed for the following:
<br /> • TPHd and TPHo by Environmental Protection Agency (EPA) Method 8015M
<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 /> 1 Q08QSSRQRSRWR.Final.doc 9 April 30,2008
<br /> 7TrW.26397.42.1307
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