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• Groundwater Monitoring <br />Since the buildup of water within the RDA is the significant factor with respect <br />to stability, we recommend that the groundwater observation wells which were <br />installed on the first three benches be checked periodically over the RDA <br />construction life. We recommend measurements every one or two months. ,This <br />could be performed at the time of density testing. We also suggest that additional <br />wells be installed as the RDA elevation increases. A well can be installed on each <br />bench or every other bench. We recommend additional wells be installed on <br />Benches 4, 6 and 8. The wells should extend through the pile into natural <br />soils/bedrock. The wells should consist of slotted PVC pipe surrounded by suitable <br />granular backfill. A bentonite seal should be provided near the surface. <br />• Quarterly Inspections <br />The quarterly inspection reports should summarize the results of the density <br />testing and groundwater measurements and comment on any significant changes. <br />This will allow a timely evaluation of problems and adjustment of procedures. We <br />recommend a qualified geotechnical engineer review the testing, groundwater <br />measurement and inspection reports on an annual basis. <br />LIMITATIONS <br />The analyses and conclusions presented in this report are for the conditions <br />described in the report. Variations in condtions between our borings are always <br />possible. The progress of RDA construction should be inspected quarterly as <br />required by State regulations. Compaction testing and groundwater observations <br />• <br />28 <br />