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Landfill Closure• Post -Closure Maintenance Plan FormerSNYDER DUMP SITE - y. r Property 22865 South Henry Road, Escalon, California On behalf of Mr. Mick Evans (property owner), Advanced GeoEnvironmental, Inc. (AGE) has prepared this preliminary Corrective Action Plan (CAP) for landfill post -closure activities and maintenance at 22865 South Henry Road, Escalon, California (site). This CAP was prepared in accordance with the San Joaquin County Environmental Health Department (SJCEHD) directive by letter dating, 28 June 2012, referencing site 39 -CR - 0031. The purpose of this CAP is to evaluate and achieve minimum requirements needed to meet California Department of Resource Recycling and Recovery (CalRecycle) requirements for daily minimum cover of waste. In order to correct violations with the California Code of Regulations which requires closure of former landfill site following a caisson of operations. At the end of a landfill's useful operation, capping is the traditional approach for closure. The site no longer accepted waste following approximately November 1990 For small landfills, a better long-term solution may be a clean closure where the fill and any impacted soil/wastes are removed. However, the landfill owner incurs significant capital costs for cap installation and indefinite recurring costs for cap maintenance and monitoring. Future development or use of the property is severely restricted, if not prohibited. For the Waller-McAnaly Property, a soil cover of approximately one -foot in thickness is proposed for the site stabilization. The details of the proposed corrective action are described in detail below. 1.1. REGIONAL SETTING The property is situated within the Great Valley Geomorphic Province of California, a large, elongate, northwest trending, asymmetric structural trough. The Great Valley Province has been filled with thick sequences of sediment ranging in age from Jurassic to Recent, creating a nearly flat -lying alluvial plain, extending from the Tehachapi Mountains in the south to the Klamath Mountains in the north. The western and eastern boundaries of this province are comprised of the California Coast Range and the Sierra Nevada, respectively. Rocks composing the basement complex of the province have not been completely defined but are believed to be metamorphic and igneous in origin. The northern and southern portions of the Great Valley Province have been designated the Sacramento and San Joaquin Valleys, respectively. The Modesto, Riverbank, Turlock Lake Formations and overlying recent alluvium are the principal source of domestic ground water in the 13,500 Advanced GeoEnvironmental, Inc.