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18 June 2001 <br /> AGE-NC Project No. 98-0433 <br /> Page 3 of 8 <br /> The monitoring well design for the will be similar to the previously installed monitoring wells. <br /> However, to allow for recovery of the dissolved MTBE, the design of the dedicated extraction <br /> ground water well near well MW-1 will vary in depth and design. The design of the dedicated <br /> recovery(extraction)well is depicted in Figure 4. <br /> Following well installation, the wells will be developed to maximize water flow into the well and <br /> minimize the quantity of fine-grained sediment drawn into the well during sampling activities. Field <br /> procedures for monitoring well installation and development are presented in Sections 3.2. and 3.3., <br /> respectively. <br /> Ground water monitoring well locations and casing elevations will be surveyed following well <br /> installation. <br /> 2.4. GROUND WATER SAMPLE COLLECTION AND ANALYSIS <br /> Following installation and development of the monitoring wells, ground water monitoring and <br /> sampling events will be conducted.at the site. Ground water samples will be collected from the <br /> monitoring wells and will be submitted to a DHS-certified laboratoryfor analysis. The ground water <br /> samples will be analyzed for: <br /> • TPH-d and TPH-g in accordance with EPA Method 8.015 Modified; <br /> • BTEX and MTBE in accordance with EPA Method 8020; <br /> • DIPE, ETBE, MTBE, TAME and TBA in accordance with EPA Method 8260 Modified. <br /> Monitoring activities will include recording depth to ground water measurements. Ground water <br /> sample collection procedures are described in Section 3.4. <br /> 2.5. GROUND WATER AQUIFER PUMP TEST <br /> To assess aquifer response to ground water recovery and further assess the general shallow, ground <br /> water aquifer characteristics, a twelve-hour ground water pump test should be conducted at the site. <br /> The proposed pump test will be designed to obtain general aquifer characteristics such as hydraulic <br /> conductivity,transmissivity and drawdown at various pumping rates.-Results of the drawdown pilot <br /> test would evaluate the potential of induced ground water drawdown for plume capture; the pump <br /> test will also help to evaluate the feasibility of ex-situ ground water"pump and treat" as a remedial <br /> alternative. Ground water extraction procedures are described in Section 3.7. and Section 3.8. <br /> Advanced GeoEnvironmental,Inc. <br />