|
Stantec
<br />L & M OPERABLE UNIT- THIRD QUARTER 2010 SITE STATUS, REMEDIAL SUMMARY,
<br />AND GROUNDWATER MONITORING REPORT
<br />October 27, 2010
<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 July 19 and July 22, 2010. 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 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. Five shallow wells, MW -3,
<br />MW -7, 2AMW-15, MW -37, and MW -38 are located in the MOU and UOU and are gauged and
<br />sampled by Wallace -Kuhl. Stantec's groundwater monitoring and sampling activities are usually
<br />conducted concurrently with Wallace -Kuhl, however during the third quarter 2010 Wallace -Kuhl
<br />gauged wells for depth to water, but did not sample any wells. Wells MW -36 and 3MW-1 R,
<br />which were previously part of the MOU/UOU MRP, were destroyed by Clayton on April 5, 2004
<br />due to the development of the adjacent parcel. Well MW -6 was destroyed by Golden State
<br />Environmental on June 21, 2007 due to excavation and construction activities in the area;
<br />MW -06R was reinstalled in close proximity in November 2008. Wells MW -4, MW -5, MW -8,
<br />MW -10, MW -11, MW -40, MW -53, and MW -39 were abandoned by the RDA's consultant T&R
<br />during 4Q08. Wells 2BMW-1 and MW -06R were abandoned by the RDA's consultant
<br />Wallace -Kuhl during 2Q10 and 3Q10, respectively.
<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 />RDA's consultant Wallace -Kuhl during 3Q10 due to redevelopment activities on the
<br />MOU.
<br />• Well 2BMW-1 was abandoned during the second quarter 2010.
<br />Iffidewater7W Stockton (Parcel 2A-0415)\Reports\QMR\2010\3010\3010QSSRORSROMR Stockton_FINAL.doc 2.1
<br />
|