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Mr. Max Ramey
<br />.tune 17, 2003
<br />Page 3
<br />Table 1. Cavern Statistics as of April 30, 2003
<br />
<br />Well Cavern
<br />Height
<br />(ft)
<br />Depth to Top
<br />(ft) Crown
<br />Thickness
<br />(ft) Cavity
<br />Radius
<br />(ft) NaHC03 Tons thru
<br />April 2003
<br />20-II 525 1,665 251 49.1 49,640
<br />30-12 523 1,633 353 57.4 68345
<br />30-14 607 1,588 146 74.6 130,869
<br />20-19 506 1,712 247 60.4 70,821
<br />20-2 616 1,584 149 52.1 70,411
<br />20-30 ~ 18 1,899 293 66.9 85,343
<br />20-31 524 1,865 283 63.0 73,454
<br />20-32 526 1,957 287 67.0 83,381
<br />30-33 526 1,928 286 57.2 62,891
<br />20-35 536 1,957 271 56.1 64,275
<br />20-36 528 2,012 291 67.6 85,878
<br />20-74 521 1,913 290 73.7 57,769
<br />21-I> 516 1,633 244 54.8 57,745
<br />31-I6 517 1,690 230 65.2 82,160
<br />28-21 497 1,677 217 70.3 86,954
<br />29-20 488 1,797 257 53.1 33,348
<br />29-32 436 1,806 272 42.5 49,447
<br />29-23 509 1,784 220 66.6 81,630
<br />Z9-24 477 1,789 269 87.9 135,438
<br />29-26 524 1,820 252 55.8 58,433
<br />29-37 522 1,776 216 60.9 71,477
<br />29-28 519 1,865 253 61.1 73,732
<br />29-29 519 1,890 256 66.9 86.430
<br />29-34 522 1,861 288 65.3 81,682
<br />29-68 507 1,857 265 39.8 18,135
<br />Avg >20 1,798 251 55.4 65,036
<br />Nae: Wells 20-76, 29-.i3. uzzd 29-78 nre co~upleled bud hcrve nor undergone si gzzifican[ production ns' of
<br />April 30, 2003.
<br />Subsequent wells were completed with the top of the cavern below the Lower Salt and have an
<br />average crown pillar thickness of 260 tt.
<br />The most mature well, 29-24, has an estimated height of 477 ft, a depth of 1789 ft and
<br />crown pillar thickness of 269 ft, and will be the first well to undergo cavern characterization
<br />testing. The height and depth used in the thermal-mechanical model do not reflect those of an
<br />average well, or Well 29-24, and were selected for earlier analysis of caverns close to the Pilot
<br />Test area. The effect of depth on the stability results is discussed in a later section.
<br />Internal Pressure in the Cavern
<br />The cavity internal pressure distribution is based on afluid-filled cavern with a fluid
<br />specific gravity (SG) of 1.0. Pressure within the cavern is typically 915 psi at the top to i 140 psi
<br />at the bottom of the cavern. This pressure is representative of the cavern pressures durinb
<br />Agapito Associates, Inc.
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