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4006, <br /> ATTACHMENT A <br /> REQUIREMENTS FOR <br /> MONITORING WELL INSTALLATION WORKPLANS AND <br /> MONITORING WELL INSTALLATION REPORTS <br /> Prior to installation of any groundwater monitoring wells, the Discharger shall submit a <br /> workplan containing, at a minimum, the information listed in Section 1 below. Wells may be <br /> installed after Water Board staff approves the workplan. Upon installation of the monitoring <br /> wells, the Discharger shall submit a well installation report that includes the information <br /> contained in Section 2 below. All workplans and reports must be prepared under the direction <br /> of, and signed by, a registered geologist or civil engineer licensed by the State of California. <br /> SECTION 1 -Monitoring Well Installation Workplan and Groundwater Sampling and <br /> Analysis Plan <br /> The monitoring well installation workplan shall contain the following minimum information: <br /> A. General Information <br /> 1. Purpose of the well installation project, <br /> 2. Brief description of local geologic and hydrogeologic conditions, <br /> 3. Proposed monitoring well locations and rationale for well locations, <br /> 4. Topographic map showing facility location, roads, and surface water bodies, <br /> 5. Large scaled site map showing all existing on-site wells, proposed wells, surface <br /> drainage courses, surface water bodies, buildings, waste handling facilities, <br /> utilities, and major physical and man-made features. <br /> B. Drilling Details <br /> 1. On-site supervision of drilling and well installation activities, <br /> 2. Description of drilling equipment and techniques, <br /> 3. Equipment decontamination procedures, <br /> 4. Soil sampling intervals (if appropriate), <br /> 5. Logging methods, which shall comply with ASTM D2488-93 Method for Visual <br /> Classification, Standard Practice for Description and Identification of Soils <br /> (Visual-Manual Procedure) for field work. <br /> C. Monitoring Well Design- Diagram and Narrative <br /> 1. Proposed well construction details: <br /> a. Borehole diameter, <br /> b. Casing and screen material, diameter, and centralizer spacing (if needed), <br /> C. Type of well caps (bottom cap either screw on or secured with stainless <br /> steel screws), <br /> d. Anticipated depth of well, length of well casing, depth and thickness of <br /> saturated zones, and length and position of perforated interval, <br /> e. Thickness, position and composition of surface seal, sanitary seal, and <br /> sand pack, <br /> f. Anticipated screen slot size and filter pack. <br /> D. Well Development (at least 48 hours after sanitary seal placement) <br /> 1. Method of development to be used (i.e., surge, bail, pump, etc.), <br /> 2. Parameters to be monitored during development and record keeping technique, <br /> 3. Method of determining when development is complete, <br /> 4. Disposal of development water. <br /> California Environmental Protection Agency <br /> �aRecyded Paper <br />