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Mr. Doc Heath -2- 11 April 2011 <br /> The existing phytoremediation plantation is exerting hydraulic control and will control <br /> exceedances within the treatment and transition areas. If the injection itself physically <br /> translocates pollutants beyond the area of hydraulic control, this will be evidenced by a <br /> sustained increase in 1,2-dichloropropane in the compliance point wells. As discussed <br /> with Ms. Kristene Tidwell of the Source Group in a 21 February 2011 telephone call, the <br /> Contingency Plan as described in the 16 February Addendum is refined to specify that <br /> if 1,2-dichloropropane concentrations in either of the two compliance point wells <br /> (MW-26 and MW-27) meet or exceed a 5 ug/L threshold, that well shall be sampled in <br /> the following quarter. If the exceedance persists for 2 consecutive quarters, then <br /> groundwater extraction will be initiated from MW-5B until concentrations fall below the <br /> threshold. <br /> We received one comment on the draft Notice of Applicability and Monitoring and <br /> Reporting Program during the 30-day public comment period ending 4 April 2011. The <br /> comment was a question whether the pollutants were also in neighborhood tapwater. <br /> Since the neighborhood is supplied with municipal water, the supply wells are not near <br /> the groundwater pollution, and the water purveyor routinely monitors for these <br /> pollutants, the comment did not result in any changes to the project proposal, <br /> monitoring program, or Notice of Applicability. <br /> General Information: <br /> 1. The project will be operated in accordance with the requirements contained in <br /> the General Order and in accordance with the information submitted in the <br /> Notice of Intent. <br /> 2. The required annual fee (as specified in the annual billing you will receive from <br /> the State Water Resources Control Board) shall be submitted until this Notice of <br /> Applicability is officially revoked. <br /> 3. Injection of materials other than HRC@ Primer and 3DMETM Microemulsion into <br /> the subsurface is prohibited. <br /> 4. Failure to abide by the conditions of the General Order could result in an <br /> enforcement action as authorized by provisions of the California Water Code. <br /> 5. The project will implement the final contingency plan included as part of the <br /> 16 February 2011 Addendum and as refined above within 30-days of it being <br /> triggered. <br /> California Environmental Protection Agency <br /> ea Recycled Paper <br />