ARCHIVED REPORTS_1995 - Laserfiche WebLink

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be 3 months. Consistent with the requirements of RCRA Subtitle D (40 CFR Section 258.57 [d]), the following factors were considered in determining the schedule for implementing the corrective action plan (which is final closure). • Extent and Nature of Contamination. The impacted groundwater is characterized by low concentrations of VOCs and likely extends no further than 500 feet from the landfill. Given these factors the implementation schedule is considered to be reasonable. • Practical Capabilities for Achieving Compliance with Groundwater Protection Standards. The recommended corrective action has the capability of reducing leachate generation which will subsequently reduce the driving force for leachate migration. • Availability of Treatment or Disposal Capacity for Wastes Managed During Implementation. No additional wastes will be generated by implementing the recommended corrective action. • Desirability of Using Technologies Not Yet Available. The recommended corrective action employs widely available materials and technologies. Subsequent remedial action phases, if necessary, may employ technologies not yet available; however, the recommended corrective action may be sufficient to reduce leachate generation and migration to the groundwater. • Potential Risks to Human Health Prior to Implementation. Because of the nature of the site,leachate, and underlying groundwater, the risks for exposure to the contamination are deemed to be minimal. Additionally, since irnplementation of the final landfill cover is scheduled to begin in July of 1995, the time during which additional leachate can be generated will be relatively low. • Resource Value of the Aquifer. The Water Quality Control Plan (Basin Plan)for the California Regional Water Quality Control Board, Central Valley Region (RWQCB, 199 1)identifies the beneficial uses of groundwater in San Joaquin County as municipal and domestic water supply, irrigation, stock watering, and industrial process and service supply. While the overall quality of the groundwater appears to be good,due to site-specific characteristics,the resource value of the shallow perched water-bearing zone downgradient of the impacted well MW-5 at Corral Hollow Sanitary Landfill can be considered to be minimal for the following reasons: SAC N.\PJO\093M390031.9BG-94\sdg:1 Rev.0,420/95 0939-003.19 5-3