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2.2 Additional Assessment <br /> GeoAudit submitted a work plan for the installation of additional soil borings and wells in <br /> April 1993. The objective of this phase of investigation was to complete the assessment of <br /> the lateral and vertical extent of vadose zone contamination, and to install remedial wells. <br /> One monitoring well, four remediation wells and two additional soil borings were installed <br /> during this phase of the investigation. The results of the final investigation at the site were <br /> included in the amended FRP submitted by GeoAudit in July of 1993. The locations of all <br /> wells are illustrated in Figures 2 and 3. <br /> In accordance with the FRP, three additional remediation wells were also installed by <br /> GeoAudit in October of 1993. The results of the third quarter monitoring and the data <br /> obtained from the installation of remedial wells VW-5, VW-6, and VW-7, were presented <br /> in the September 1993 Quarterly Report. <br /> 2.3 Quarterly Monitoring <br /> Between May of 1990 and June of 1993, several consulting firms, including Sun Tech <br /> Environmental, Inc., performed quarterly groundwater monitoring at the site. GeoAudit has <br /> recently been retained to perform quarterly monitoring at the site in accordance with the <br /> C & A order. <br /> 3.0 PROCEDURES <br /> 3.1 Groundwater Monitoring <br /> On December 27, 1993, representatives of GeoAudit visited the site to perform quarterly <br /> monitoring procedures. Water depths were measured in all wells. Water was purged and <br /> groundwater samples were collected from eight wells, in accordance with the C & A order. <br /> 3.1.1 Monitoring Well Purge Procedures <br /> A solonist water level meter was used to measure the groundwater depth in each monitoring <br /> well (Table 1). The eight monitoring wells (MW-6 through MW-14 and EW-1) were then <br /> purged of a minimum of three well volumes of water. The wells were purged using a 2" <br /> submersible pump. Temperature, pH and conductivity of the purge water were measured <br /> at approximately 2-gallon intervals (10-gallon intervals for EW-1) using Orion pH, <br /> temperature and conductivity meters (Table 2). The water was stored in DOT-approved <br /> drums and stored on-site. <br /> O­e�w�,5.,i—.1„� 3 <br /> 3M.WO MOR <br />