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August 11, 2000 - 7 - 003-7170 Figure 2. The new well will provide additional elevation and background water quality data. Water quality data collected from the new well in conjunction with the existing monitoring wells will be used to assess impacts of the process wastewater on the shallow ground water regime as described in Section 4.2. The following is a description of the methods and procedures associated with the installation of the proposed new well. 3.1 Ground Water Investigation One additional ground water monitoring well will be installed to supplement the existing monitoring well network at the site for the purposes of establishing baseline ground water quality conditions, monitoring ground water flow patterns and monitoring future ground water quality. The depth of the monitoring well is estimated to be 80-feet bgs. The monitoring well will be installed by drilling a boring with nominal, 8-inch hollow stem augers. The monitoring well will be constructed using 2-inch diameter, flush-threaded, schedule 40 polyvinyl chloride (PVC) casing and screen. The monitoring well will be completed with a 12-inch diameter flush-mount, traffic-rated well box. Following installation, and following a 48-hour period, the well will be developed and surveyed. After development and an approximately 24-hour time period, ground water samples will be collected from each monitoring well. Monitoring well permitting, construction, development, sampling, surveying, health and safety planning and disposal procedures are described in Appendix A. 3.2 Equipment Decontamination All field equipment used in sampling will be decontaminated using a combination of Alconox and deionized water. Water used to decontaminate the field equipment will be contained in labeled, 55- gallon drums and left on-site. Soil cuttings generated during drilling will be placed in 55-gallon drums or a roll-off bin and contained on-site for appropriate disposal. 3.3 Well Completion Report •— At the completion of monitoring well installation, development and sampling, and upon receipt of the chemical analysis results, a report will be prepared summarizing the findings of the field investigation. The report will include boring logs and tables summarizing the chemical analysis results. The report r will also include a description of the field investigation procedures and an interpretation of the site conditions. 4.0 MONITORING PLAN 4.1 Sampling and Analysis Ground water monitoring will be carried out to assess changes is ground water quality and ground water flow direction. Monitoring will consist of water level measurements for the assessment of ground water flow patterns and sampling for chemical analyses. Ground water will be collected and analyzed for the parameters identified in the WDRs. Monitoring wells will be sampled quarterly through the duration of the interim remedial actions or one year. .. Roo-37Am Golder Associates