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------aDYa� CLEARWATER ' G R O U P • Environmental Services ' drilled to define the lateral extent of soil andg roundwater contamination on the northeastern ' portion of the site and assess possible off-site sources The results of this phase of investigation confirmed the verticle and horizontal extent of both sorbed- and disolved-phase contamination at ' the subject site The results of this phase of investigation were submitted in Clearwater's Additional Assessment and Quarterly Groundwater Monitoring First Quarter 2000 I Based on the significant sorbed- and dissolved-phase contaminant concentrations beneath the Isite, Clearwater recommended the testing of engineered in-situ remedial technologies at the site In order to effectively test these technologies, on February 22, 2002, Clearwater supervised the installation of one 4-inch dual-phase extraction well and one 2-inch air sparge well at the core of the contaminant plume I On March 12, 13 and 14, 2002 Clearwater performed groundwater extraction (GWE) feasibility testing, combined GWE and soil vapor extraction (SVE) feasibility testing, and GWE/SVE with I air sparge (AS) feasibility testing, respectively Details on methods and results can be found in Clearwater's Well Installation and Feasibility Testing Report dated May 9, 2002 2.0 RECENT GROUNDWATER MONITORING 2.1 Purpose Quarterly groundwater monitoring is routinely performed at the site to monitor dissolved-phase contaminant concentrations in the existing monitoring well network (MW-1 through MW-8) The objective of these activities is to identify trends in contaminant concentration, contaminant type, and groundwater elevations over time 2.2 Groundwater Monitoring Activities ' Groundwater monitoring and sampling activities were conducted on December 16, 2003 Groundwater elevation data were obtained from each of the monitoring wells using an electronic ZB178C RAP 4 May 18,2004