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10 October.1996 <br /> • _ Region 5,No Further Action � 7 - <br /> DRAFT DRAFT DRAFT DRAFT DRAFT DRAFT' DRAFT DRAFT <br /> while natural processes reduce the adverse impacts in ground water. In considering <br /> f whether the time anticipated for passive bioremediation is reasonable, several factors <br /> may affect the determination. These factors include a comparison to the time . <br /> anticipated for active remediation, existing use of the ground water and the time for <br /> probable use of the aquifer. Thus, if existing or near-term uses of the ground water <br /> are impaired, passive bioremediation might not be appropriate. On the other hand; if <br /> Lcurrently-used waters are not affected, and the pollutants are not expected to migrate <br /> to waters that will be used before the remediation is effective, then passive <br /> bioremediation may be appropriate. Using either passive or active remediation <br /> measures, the end result should be the same: i:e., protection of .beneficial.uses and <br /> achieving compliance with water quality objectives. <br /> LAll proposals for remediation, whether active or passive, require support by technical <br /> reports with rationale demonstrating that the remediation proposed is appropriate <br /> and will achieve compliance with the water quality objectives within a reasonable <br /> } L time period. If existing or near-.term uses are impaired, more rapid cleanup should be <br /> required. If the pollution does not affect currently used aquifers and is not expected to <br /> migrate to waters that are currently used, or used the the near future, then cleanup to <br /> L• water quality objectives could be allowed to occur over a longer time frame. In cases <br /> where it has been determined that a longer time is'appropriate, passive cleanup <br /> measures may be considered. Passive cleanup measures do not require a change in <br /> the ultimate goal of cleanup—restoration of beneficial uses by reducing pollutants to <br /> levels that are lower than applicable water quality objectives. Passive measures are <br /> risk based. Risks to beneficial uses drive both cleanup levels and time schedules for <br /> cleanup. <br /> L NO FURTHER ACTION REQUIRED <br /> s <br /> L DOCUMENTATION <br /> The minimum information required in the report is included in Table 1. Submit the <br /> data and check-off'Table 1 with "yes', "no" or "NA" (not applicable), as appropriate. <br /> I <br /> Additional information submitted, such as risk assessments or fate and transport <br /> modeling, must include the assumptions used. <br /> LUpon review, when Board staff determines that the No Further Action Required <br /> Report substantiates the request, remedial and monitoring activities may cease. At <br /> that time, Board staff will prepare a memo summarizing the remediated site <br /> L. conditions and a No Further Action Required letter issued by the Executive Officer of <br /> this Board (or Local Implementing Agency or Local Oversight Program county with <br /> concurrence by Regional Board staff). <br /> L <br /> When soil and ground water pollution remains on site, nothing in the no further, <br /> action required determination shall constitute or be construed as a satisfaction or <br />