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1. INTRODUCTION <br /> This Piezometer Installation Work Plan (Work Plan) was prepared by Geosyntec <br /> Consultants, Inc. (Geosyntec)on behalf of USA Waste of California, Inc. (USA Waste), <br /> for the Central Valley Compost Facility (CVC; Site) located in San Joaquin County, <br /> California. In recent email correspondence between USA Waste and the Central Valley <br /> Regional Water Quality Control Board (CVRWQCB) dated 4 May 2023, it was agreed <br /> that installation of piezometers at the Site is necessary to better understand the depth to <br /> groundwater in the vicinity of the North and South contact water ponds. This Work Plan <br /> describes the scope of work for installation of three piezometers. <br /> 2. PRE-FIELD ACTIVITIES <br /> Prior to the start of piezometer installation field activities, the following will be <br /> performed. <br /> • Piezometer installation permits will be obtained from San Joaquin County <br /> Environmental Health Department (SJCEHD). The California Well Standards <br /> require a minimum 20 foot surface seal be installed unless approval of a shallower <br /> seal is obtained from the permitting agency. Groundwater is anticipated to be <br /> encountered at the Site at a depth shallower than 20 feet below ground surface <br /> (bgs). Therefore, a request will be made to SJCEHD to allow the installation of a <br /> minimum 5-foot surface seal rather than a minimum 20-foot surface seal on the <br /> piezometers. <br /> • A site-specific health and safety plan(HASP)will be prepared and made available <br /> onsite during all field activities.Prior to the start of field activities,a safety tailgate <br /> meeting will be conducted; and, <br /> • Underground service alert(USA)will be contacted a minimum of 48 hours prior <br /> to commencement of piezometer installation. <br /> 3. PIEZOMETER INSTALLATION <br /> I <br /> The piezometers will be drilled and installed by a C-57 licensed drilling contractor. The <br /> approximate proposed piezometer locations are shown in Figure I and may be modified <br /> based on conditions encountered in the field. The piezometers will be drilled with the <br /> hollow stem auger drilling method.The borings will be logged from the cuttings by field <br /> I <br />