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Mr.Siddharth Sewalia and Mr.Martin Hermann <br /> Notification of Adjustment to Full-Scale In Situ Treatment Performance Sampling of the North Yard <br /> Former Marley Cooling Tower Site Page 4 June 4,2013 <br /> • MW-401 —Chromium is stable, far below and never exceeded the WQO since I" quarter <br /> 2008. <br /> • TW-12 — Chromium is stable, far below and never exceeded the WQO since 15` quarter <br /> 2008. <br /> • TW-13 — Chromium is stable and far below the WQO since 3`d quarter 2010, with one <br /> exceedence in 4`h quarter 2012. <br /> If another round of in situ remediation injections is to occur, the full list and analytical suite of <br /> sampling will be performed as outlined in MRP Section lI. <br /> Upcoming Sampling Event(July 2013) <br /> SPX is currently making arrangements for groundwater sampling in July, to cover the site-wide <br /> groundwater monitoring program and the performance monitoring program. SPX respectfully <br /> requests a response from RWQCB and DTSC staff regarding the changes outlined by <br /> June 17, 2013, so the sampling list can be finalized for the July sampling event. <br /> Plans for Future Remedial Injections <br /> SPX continues to evaluate groundwater data and is developing a plan for additional Intermediate <br /> Zone groundwater in situ treatment. Draft work plan(s) will be submitted for additional drilling <br /> and testing in the near future. <br /> References <br /> MWH Americas,Inc. (MWH), 2007. Final Remedial Action Plan Amendment. June. <br /> Sincerely, <br /> MWH Americas,Inc. <br /> 00 <br /> Eric Rowney, PE, PMP <br /> Project Manager <br /> Attachments: <br /> Figure 1. In Situ Reactive Barrier Locations and Horizontal Wells in Retort Pit Area <br /> Table 1. Laboratory Analytical Results <br /> cc: Dan McGrade, SPX Corporation <br /> Jim Lingo, SPX Cooling Technologies <br /> Steven Stuart,Dudek <br /> Amy Wilson,TRC <br /> Harlin Knoll, SJC-EHD <br />