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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 unpacted showing Iocations of former <br />' and existing tank systems, elevation contours, gradients, and <br /> nearby surface waters, buildings, streets, and subsurface utilities, <br /> 3 High and low ground water Ievels (below ground surface), <br /> 4 Tabulated results of all sampling and analyses, <br />' S 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 Technology 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, <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 J <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 provideo, Board staff has determined rand <br /> the Local Implementing 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 />