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4 t � t Region 5,No Further Action t 10 October 1996 DRAFT, DRAFT DRAFT DRAFT, DRAFT DRAFT DRAFT DRAFT INTRODUCTION i Central Valley Regional Board staff recognize that total cleanup of a site, although t+ generally possible, is not always feasible or,warranted ("site" includes on- and/or off- site problems resulting from the release ofunderground storage tankcontents). Therefore, no further action required at`a site may be unconditional if the site has been remediated successfully, or with conditions that"no further action is required at this time" when total cleanup can not be achieved. Regardless of the action requested, an Appendix B report is required for Regional Board review, The report is to document whether complete remediation of the site has been achieved, or that a "no further action" of a site is warranted and that some soil or ground water contaminants will remain. i.� The report must discuss the site history, existing conditions, and rationale why the, site may no longer require remediation and contamination remain on- or off-site. The rationale must include a finding about future impacts on water quality and human health and safety. The supporting data and summary checklist (Table 1).is to be completed and submitted with the report by the Responsible Party(ies) or their designee. If it has been determined that only soil has been impacted, evidence substantiating the condition must be submitted. f DETERMINING WHEN LUST SITES POSE A LOW RISK TO HEALTH, SAFETY AND THE ENVIRONMENT The following recommendations are to be applied only to sites contaminated with petroleum hydrocarbon fuels, i.e., gasoline, diesel, fuel oil, aviation fuel mixtures and F their additives. For each,case, site characterization is required to determine the extent of contamination, the risk to human health and the environment , and the impact on existing and probable future beneficial uses of water resources. Site monitoring must show that the remedial measure(s) applied by the Discharger is reducing or removing the petroleum hydrocarbons at the rate and in the time schedule projected. The Discharger must demonstrate that the selected remedial measure(s) are effective. CASE EVALUATION Each site is evaluated' on a case-by-case basis'to determine if it is a "low risk"case. Upon determining that the case meets the criteria for "low risk", a "no further action . required" (NEAR) letter will be issued. Sites with a significant mass of;petroleum hydrocarbons left in place are not precluded from consideration of low risk. A case maybe a low risk site by definition or, by''active or passive remediation, achieve a low risk status. ' "Environment"includes the unsaturated or vadose zone,and surface water and ground water. 3