|
L & M OPERABLE UNIT- FIRST QUARTER 2012 SITE STATUS, REMEDIAL SUMMARY,
<br />AND GROUNDWATER MONITORING REPORT
<br />April 30, 2012
<br />I:\Tidewater\TW Stockton (P2A)\QMRs\2012\1Q12\1Q12 QSSR QRSR QMR Stockton_FINAL.doc 2.1
<br />2.0 Groundwater Monitoring and Sampling
<br />2.1 GROUNDWATER MONITORING AND SAMPLING PROCEDURES
<br />Quarterly groundwater sampling of 14 shallow wells (A-Zone) (MW-9, 2AMW-12, MW-18,
<br />MW-20 through MW-23, MW-25, MW-28, MW-30, MW-31, MW-33, MW-34, and MW-45), 15
<br />B-Zone wells (MW-16, MW-24, MW-26, MW-27, MW-29, MW-32, MW-35, MW-42, MW-44,
<br />MW-51, and MW-56 through MW-60), eight C-Zone wells (MW-54, and MW-61 through
<br />MW-67), and eight D-Zone wells (MW-55, and MW-68 through MW-74), were performed by
<br />Stantec between January 17 and 20, 2012. Groundwater monitoring and sampling activities
<br />were performed as required by MRP No. R5-2004-0820 (Appendix A), which was issued by the
<br />RWQCB on May 6, 2004. MRP No. R5-2004-0820 is summarized in Table 1.
<br />On behalf of the City of Stockton, Wallace-Kuhl is responsible for monitoring and sampling at
<br />the portion of the South Shore Parcels identified as the MOU and the UOU. Five shallow wells,
<br />MW-3, MW-7, 2AMW-15, MW-37, and MW-38 are located in the MOU and UOU and are
<br />gauged and sampled by Wallace-Kuhl. Stantec’s groundwater monitoring and sampling
<br />activities are conducted concurrently with Wallace-Kuhl; during 1Q12 Wallace-Kuhl gauged
<br />wells for depth to water, but did not sample. Wells MW-36 and 3MW-1R, which were previously
<br />part of the MOU/UOU MRP, were destroyed by the City of Stockton on April 5, 2004 due to the
<br />development of the adjacent parcel. Well MW-6 was destroyed by the City of Stockton on June
<br />21, 2007 due to excavation and construction activities in the area; MW-06R was reinstalled in
<br />close proximity in November 2008. Wells MW-4, MW-5, MW-8, MW-10, MW-11, MW-40,
<br />MW-53, and MW-39 were abandoned by the City of Stockton during 4Q08. Wells 2BMW-1 and
<br />MW-06R were abandoned by the City of Stockton during 2Q10 and 3Q10, respectively, due to
<br />the construction of the DMV building.
<br />Groundwater monitoring wells were sampled according to the requirements stated in MRP
<br />No. R5-2004-0820, with the exception of the following:
<br />Shallow wells MW-1 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-4, MW-5, MW-6, MW-8, MW-10, MW-11, MW-36, MW-39, MW-40, MW-41,
<br />MW-53, and 3MW1-R were previously destroyed due to Unocal excavation activities.
<br />MW-6 was reinstalled as MW-06R; however, MW-06R was subsequently abandoned by
<br />City of Stockton during 3Q10 due to construction of the DMV on the MOU.
<br />Well 2BMW-1 was abandoned during 2Q10 due to the construction of the DMV building.
|