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Page 8 <br />Table 2-2. Typical Depth and Thicknesses of Overlying <br />-") Strata from Core Hole 26-88-1 <br />V l11Lp 1-V11116L1V11 V.V -1LVV.V LLV V.V <br />R-8 Zone 1206.0 -1392.0 186.0 <br />A-Groove 1392.0 -1408.0 16.0 <br />Mahogany (R-7) Zone 1408.0 -1582.0 174.0 <br />Mahogany Mazker 1439.0 Not applicable <br />B-Groove 1582.0 -1604.0 22.0 <br />R-6 Zone 1604.0 -1781.0 177.0 <br />L-5 Zone 1781.0 -1965.0 184.0 <br />Dissolution Surface 1892.8 Not applicable <br />L-SE 1892.8 -1903.8 11.0 <br />L-SC 1903.8 -1913.7 9.9 <br />L-SB l 913.7 -1925.0 11.3 <br />L-SA-Boies Bed 1925.0 - 1962.5 37.5 <br />OSMB 1949.0 - 1953.4 4.4 <br />Top R-5 Zone 1965.7 Not applicable <br />The lower aquifer has been fitrther chazacterized from the simple representation shown in <br />Figure 2-1 based on data developed during the drilling of core hole 26-88-1. The hydrological <br />tests conducted during the drilling of this hole established that the R-6 acts as an aquitazd sepa- <br />rating contaminated waters in the L-5 above the dissolution surface from potable water in the B- <br />Groove. The "Mahogany Zone" acts as an aquitard between the upper and B-Groove aquifers. <br />The R-6 aquitard is highly fractured and, like the L-5, contains many collapse structures <br />(breccias) resulting from dissolution of soluble nahcolite and halite. However, water production <br />during drilling showed the R-6 to be tight and an aquitard relative to the L-5 which produced ap- <br />proximately 10 gpm during drilling. <br />Agapito Associates, Inc. <br />