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'jam j- r <br />• 02 March 1999 <br /> - AGE-NC Project No 98-0448 „ <br /> Page 9 of 10 <br /> washed prior to starting the boring <br /> 4 4 WELL DEVELOPMENT <br /> Development will consist of a combination of balling and ground water pumping to remove the <br /> mayor portion of fine-grained sediment from Inside the well and surging to flush out or draw in <br /> sediment from the filter pack Development activities will be continued until field parameter(pH, <br /> electrical conductivity, and temperature) readings have stabilized <br /> 4 5 DRAWDOWN PILOT TEST <br /> A drawdown pilot test will be performed to evaluate feasibility of ground water drawdown in <br /> conjunction with SVE ' <br /> • A water drawdown pump will be utilized to mduce a decline in static water level from the extraction <br /> well, pressure transducers will be deployed in all wells to measure difference in ground water levels <br /> before well pumping versus during well pumping Ground water pumping rates will be increased at <br /> regular intervals to achieve optimum pumping rate for the greatest drawdown influence Results of <br /> the drawdown pilot test will be included in a Corrective Action Plan (CAP) and submitted to PHS- <br /> EHD <br /> Purged ground water will be containerized in a 20,000-gallon Baker tank, composite "grab" ground <br /> water samples will be collected from the Baker tank for analysis of TPH-g, BTEX and MTBE The <br /> purged ground water will be discharged Into the City of Stockton sewer system pending regulatory <br /> approval or be transported to a suitable hazardous waste facility The duration of the drawdown pilot <br /> test will be approximately 8-hours <br /> 46 SOIL VAPOR EXTRACTION WELL INSTALLATION <br /> Installation of two SVE wells are proposed utilizing a truck-mounted drill rig equipped with 8-inch <br /> diameter hollow stem augers Hollow stem augers will be pressure cleaned prior to advancement in <br /> each borehole The SVE wells will be advanced to a depth of approximately 35 feet bsg and <br /> completed with 2-inch diameter, schedule 40 PVC well casing Each well will utilize 15 feet of <br /> slotted well casing (0 010-inch screen size) All PVC well casing will be emplaced through the <br /> hollow stem augers A#212 Lonestar Lapis Luster sand will be poured down the annulus between <br /> the well casing and the inner wall of the hollow stem auger The filter pack will be placed adjacent <br /> to the screen from the bottom of the boring to a point approximately 2 feet above the top of the <br /> Advanced GeoEn,.ironmentai,Inc <br />