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• Table 1 Monitoring Well Water Levels, con't. Well Date Well Depth to Casing Water Floating No Sampled Depth Water Elev Elev Product (ft) (ft) (MSL ft)* (MSL ft) MW-9^ 8120197 1595 833 4828 3995 None MW-9^ 12/12/97 1595 8 00 — 4028 None MW-9^ 3131198 13 18 7 23 ---- 41 05 None MW-9^ 6130198 1318 749 - -- 41 79 None MW-9^ 9129198 13 18 876 ---- 3952 None MW-9^ 1114199 1318 8 41 ----- 3987 None MW-9^ 4129199 1332 787 — 4041 None MW-9^ 1015199 1332 871 — 39 57 None MW-9^ 1127100 13 11 813 ---- 4015 None Casing elevation data from Evax Technologies, Site Investigation Report, April 7, 1992 ^ Casing elevation data from Triple°E" Engineering and Surveying, August 14, 1997 Monitoring for 3rd quarter canceled by PHS EHD The sampler proceeded to purge well volumes of groundwater using a submersible electric purging pump (a volume calculation was done for each well following sounding measurements) Conductivity, pH, and water temperature readings were obtained between each well volume purge, and these were noted on the attached groundwater sampling information sheets Once these readings stabilized after two consecutive purge volumes aquifer water is assumed to be entering the well When the well recovered to about 80% of the initial water level, the sample was collected Purge water was stored on-site in drums The well sampling information sheets are attached The groundwater sample was collected with a new disposable bailer The groundwater sample was then poured with minimum cavitation into the appropriate, laboratory prepared sample containers leaving no headspace The sample container was then immediately capped, labeled and placed in a chilled ace chest for shipment to Chromalab, Inc in Pleasanton, California (a State Certified Testing Lab) under chain-of-custody documentation Groundwater Contour Map and Flow Gradient A groundwater contour map to a known datum was prepared for the data listed in Table 1 above (see Figure 1) The groundwater flow direction was to the north-northwesterly under a calculated gradient of 00029 The flow direction is consistent with historic observed trends, and remains relatively flat Overall groundwater levels appear to have dropped slightly from the previous quarter The groundwater "mound" is previously noted as being centered at well MW-2 has disappeared, groundwater mounds have formed in this vicinity in the past