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REQUESTS FOR CLOSURE 2 1 MARCH 1994 <br /> CLOSURE DOCUMENTATION <br /> The minimum information required in the closure report includes: <br /> 1. Distance to production wells for municipal, domestic, agriculture, <br /> industry and other uses within 2000 feet of the site, <br /> 2. Site maps, to scale, of area impactedshowinglocations of former <br /> and existing tank systems, elevation contours, gradients, and <br /> nearby surface waters, buildings, streets, and subsurface utilities, <br /> I High and low ground water levels (below ground surface), <br /> 4. Tabulated results of all sampling and analyses, <br /> 5. Vertical and lateral concentration contours of contaminants found <br /> initially, and those remaining in soil and ground water, both on <br /> and off site, <br /> 6. Mass balance calculation of the substance treated versus that <br /> remaining, <br /> 7. Technoloax;used to clean the site; if Best Available Technology <br /> (BAT) was not used, explain why, <br /> 8. Zone of influence calculated for the subsurface remediation system <br /> and the zone of capture attained for the soil and ground water <br /> remediation system, `�..K <br /> 9. Reasons why "background" was/is unattainable using BAT, and <br /> 10. Rationale why conditions remaining at the site will not adversely <br /> impact water quality, health, or other beneficial uses. <br /> Additional information submitted, such as risk assessments or fate and transport <br /> modeling, must include the assumptions used. <br /> Upon review, if Board staff determines that the Closure Report substantiates the <br /> request for closure, the remedial and monitoring activities may cease. Upon <br /> concurring with the closure request, Board staff will prepare a letter which <br /> summarizes the site conditions and includes the following: <br /> "Based on the information provided, Board staff has determined [and <br /> the Local Implenienting Agency concurs,] that appropriate response <br /> actions have been completed, that acceptable remedial practices were <br /> implemented, and that, at this time, no further investigation, remedial <br /> -- or removal action, or monitoring is required at [Facility name and <br /> address]• <br />