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substances) being investigated. Chain-of-Custody and QA/QC procedures are followed and <br /> monitored at all times. <br /> 3.7 Well Installation Procedures <br /> • All wells will be installed by state-licensed drilling companies. All Federal, State, and Local <br /> regulations will be followed, including obtaining all required permits. <br /> • Monitoring well construction detail will be recorded on a boring/well log form. <br /> • Bentonite seals/grout will be used for surface seals to prevent surface water/product <br /> infiltration. <br /> Wells will be installed with locking caps with padlocks, and wells will be completed in well <br /> monuments approximately three feet above grade to prevent surface runoff from entering the <br /> well box. <br /> • Permanent reference marks will be cut in the casing tops to provide consistent reference <br /> points for fluid level measurements. <br /> • All well locations and elevations will be surveyed by a state registered Land Surveyor. All <br /> well locations and elevations will be plotted on the site map and entered into the project data <br /> base. <br /> ® . Monitoring wells, piezometers, vapor extraction, injection, observation wells, and air <br /> sparging wells will be constructed of threaded PVC or stainless steel casing and screens. <br /> Screen, casing, filter pack for monitoring or remediation wells will be installed through the <br /> hollow stem auger flights under unstable borehole wall conditions. When borehole wall <br /> conditions are stable screen, casing, and filter pack may be installed immediately after <br /> removal of auger flights or drill tooling. <br /> • Unconsolidated soils and sediments will be drilled with a hollow stem auger, consolidated <br /> and cemented sediments, and bedrock will be drilled with rock bit, tricone, air rotary or other <br /> method depending upon the situation. <br /> 3.8 Well Development and Monitoring Procedures <br /> • Newly installed monitoring or extraction wells are allowed to set at least 24 hours after <br /> completion. Wells are developed by alternately pumping and surging. Well development <br /> American Geological Services, Inc. <br /> 8 <br />