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f <br />J <br />u <br />L <br />l <br />0 <br />!7 <br />I <br />The sampling and analysis procedures for the monitoring program at San Joaquin County sanitary <br />landfills provide for consistent and reproducible sampling methods, proper application of analytical <br />methods, accurate and precise analytical results, and guidelines so that the overall objectives of the <br />monitoring program are achieved. <br />The following documents have been used as guidelines for the development of these procedures: <br />• Procedures Manual for Groundwater Monitoring at Solid Waste Disposal Facilities, U.S. <br />Environmental Protection Agency (USEPA)-530/SW-611, August 1977 <br />• RCRA Groundwater Monitoring Technical Enforcement Guidance Document, OSWER <br />9950.1, September 1986 <br />• Test Methods for Evaluating Solid Waste: Physical/Chemical Methods, USEPA SW -846, <br />3rd edition, November 1986 <br />• Methods for Organic Chemical Analysis of Municipal and Industrial Wastewater, <br />USEPA-600/4-82-057, July 1982 <br />• Methods for Chemical Analysis of Water and Wastes, USEPA-600/4-79-020, revised <br />March 1983 <br />Monitoring wells at the site are measured with an electric sounder for static water levels during a <br />single water level survey prior to collecting groundwater samples. The electric sounder is a <br />transistorized instrument that uses a reel -mounted, two -conductor, coaxial cable that connects the <br />control panel to the sensor. Cable markings are stamped at 1 -foot increments. The water level is <br />measured by lowering the sensor into the monitoring well. A low -current circuit is completed <br />when the sensor contacts the water, which serves as an electrolyte. The current is amplified and <br />fed into an indicator light and audible buzzer, signaling when water has been contacted. A <br />Groundwater Monitoring <br />A-1 Department of Public Works/Solid Waste <br />County of San Joaquin <br />