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a <br /> Mr. Frank Barone - 4 - • 22 February 2006 ' <br /> The elements of MSRM's contingency plan that Regional Water Board staff have modified are <br /> summarized below. With the inclusion of these modifications, Regional Water Board staff <br /> conditionally concur with the Revised Contingency Plan. <br /> • If the following thresholds are exceeded in monitoring wells MW-2, MW-513, MW-7, <br /> MW-23, MW-25, MW-26, MW-27, MW-28, or MW-29 for two consecutive semi-annual <br /> monitoring events, MSRM shall submit a work plan to implement the contingency plan <br /> identified for human health exceedances. The thresholds for constituents in groundwater are: <br /> DBCP above 170 ug/L, 1,2,3-TCP above 15 ug/L, and 1,2-DCP above 280 ug/L. <br /> • If groundwater cleanup goals for constituents of concern are exceeded in MW-26, MW-27, or <br /> MW-28 for two consecutive semi-annual monitoring events, MSRM shall provide a work <br /> plan for a downgradient monitoring well. <br /> • If the downgradient monitoring well exceeds cleanup goals for two consecutive semi-annual <br /> monitoring events, MSRM shall provide a work plan to implement the remedial action. <br /> The Revised Contingency Plan and conditions of approval provide MSRM and the Regional <br /> Water Board the flexibility to allow the phytoremediation plantation to develop hydraulic control <br /> while providing a remediation alternative in case the control does not extend beneath the <br /> do gradie �' ope ies. If you have any questions, you may contact me at (916) 464-4680. <br /> AMY TEIIRELL <br /> Private Sites Cleanup Unit <br /> cc: Mr. Michael Infuma, San Joaquin County Environmental Health Department <br /> Mr. Alan Prouty, J.R. Simplot, Boise ID <br /> Mr. Kyle Rutherford, UNOCAL, San Luis Obispo <br /> Mr. Timothy Souther, Geomatrix, Fresno <br />