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Corrective Action Financial Assurance Estimate Harney Lane Sanitary Landfill San Joaquin County Revised September 30, 2008 INTRODUCTION Purpose The purpose of this report is to estimate the cost of corrective action at the Harney Lane Sanitary Landfill against a"reasonably foreseeable release" in accordance with Sections 20380(b) and 22220-22222 of Title 27, California Code of Regulations. The County will then demonstrate financial assurance for this cost. Revision Contents This revision incorporates the following: • Costs for installation of landfill gas (LFG) components of corrective action are based on a contractor bid received for similar work at the Corral Hollow Landfill. • Other corrective action costs are updated from the cost estimate submitted in 2007 by 2.7% in accordance with California Integrated Waste Management Board annual inflation factor. • Total corrective action costs are based on a 30-year corrective action period. Site Description The Harney Lane Sanitary Landfill is an unlined Class III disposal site located at 14750 East Harney Lane on a 127-acre parcel of which 94 acres received refuse fill (Figure 1). The landfill is owned and maintained by San Joaquin County. Waste discharge included commercial and household waste, construction/demolition waste, and agricultural waste. The landfill stopped receiving waste in 1991 and was closed in 1994. The site is bordered by agricultural land. Hydrogeology To a depth of approximately 80 feet, soil consists of unconsolidated silts, clays, and sands. The measured hydraulic conductivity of the native soil underlying the landfill ranges between 10-6 to 10-8 centimeters/second. Groundwater is first encountered approximately 120 below the ground surface. It is unconfined and fluctuates approximately 4 feet seasonally. Groundwater flow is toward Corrective Action Financial Assurance Cost Estimate 1 September 30,2008 Harney Lane Sanitary Landfill San Joaquin County Public Works Department