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n -' "�'"''r-fes-.;, S. u-^''41ti.^rF y ..�I*' tr",,. ^'k.Ti' '��, y' N. a,�,^cy� -C �a,.. a" 'S, E�i;�s titrw� aT ��' +ate-..✓M y T iTable 1. Monitoring Well Water Levels, cont. Well Date Well Depth to Casing Water Floating No Sampled Depth Water Elev Elev Product (ft) (ft) (MSL ft)' (MSL ft) MW-8^ 8/20/97 16 00 796 4790 39 94 None MW-8^ 12/12/97 16 00 757 ----- 40 33 None MW-8^ 3/31/98 14 56 679 ----- 41 11 None MW-8^ 6/30/98 14 51 679 ----- 40 95 None MW-8^ 9129198 14 51 824 ----- 39 66 None MW-8^ 1/14/99 14 51 798 ----- 39 92 None MW-9^ 8/20/97 15 95 833 48 28 39 95 None MW-9^ 12/12/97 15 95 800 ----- 40 28 None MW-9^ 3131198 13 18 723 ----- 41 05 None MW-9^ 6/30/98 13 18 749 ----- 41 79 None MW-9^ 9/29/98 13 18 876 ----- 39 52 None MW-9^ 1/14199 13 18 841 ----- 39 87 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 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) Between each well volume purge, conductivity, pH, and water temperature readings were obtained and 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 containing data on temperature, conductivity, pH, depth to water, and well volumes purged 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 ice 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 0 003 The flow direction is consistent with historic observed trends, and remains relatively flat Overall groundwater levels appear to have declined slightly from the previous quarter 40 Page 3