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APPENDIX A <br /> SAMPLING AND ANALYSIS PROCEDURES <br /> INTRODUCTION <br /> The sampling and analyses 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 /> GROUNDWATER ELEVATION SURVEY <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 /> sensitivity control will compensate for highly saline or conductive water. The electric sounder is <br /> decontaminated after each use by rinsing with deionized water. <br /> e _ NWiscellaneous\Groundwater Info-All Sites\SAP AppendixA.doc <br /> A-1 <br />