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' - Region 5,No Further Action 3 10 October 1996 <br /> DRAFT.DRAFf DRAFT DRAFT DRAFT DRAFT' DRAFT DRAFT <br /> W- Cases may qualify as "low risk" when the lead agency finds that: <br /> 1. accurate documentation provided shows the criteria below for <br /> ~ Vadose Zone or Ground Water cases have been met; <br /> 2. remediation and monitoring verify the criteria will be achieved; <br /> and, . <br /> 3. State and local standards for monitoring well closure have been <br /> met and verified. <br /> FOUNDATION DOCUMENTS <br /> �- Foundation documents for defining site problems and appropriate responses include: <br /> State Board Policy No. 92-49: Policies and Procedures for Investigation and Cleanup <br /> and Abatement of Discharges Under Water Code Section 13304, as amended; The <br /> •' Water Quality Control Plans (Basin Plans) for the California Regional Water Quality <br /> Control Board, Central Valley Region; Title 23, Division 3, Chapter 16 Article 11 of <br /> California Code of Regulations, Underground Storage Tank Regulations; and Title 23, <br /> Division 3, Chapter 15, Sections 2511(d) and 2550.4 of the California Code of <br /> Regulations, Discharges of Waste to Land Regulations. <br /> These documents and the following recommendations are not new, but rather, <br /> protocol and procedures that have been available to a tank owner or operator since <br /> ` inception of the Central Valley Regional Board LUST program. <br /> VADOSE ZONE CASES <br /> "Vadose zone" cases are those where fuel hydrocarbons or additives have not <br /> reached, and will not reach, the ground water or capillary fringe. <br /> CRITERIA FOR LOW RISK VADOSE ZONE DESIGNATION <br /> i <br /> All the following must be demonstrated in order to designate a case as a "low risk": <br /> 1. Demonstrate that only the vadose zone has been affected. <br /> See the Tri-Regional Recommendations, Page nine, Figure 1 and Tables 1 &2, <br /> and Appendix A to the Tri-Regional Recommendations. <br /> At some sites, natural biodegradation may be occurring at rates sufficient <br /> to provide a rationale for not actively remediating the site or for <br /> reducing the degree of active remediation. The Discharger must. <br /> provide technical documentation for the passive measure and <br /> project a time schedule for the remediation to clean up the vadose <br />