_REVISION - M1981302 ‎(82)‎

• Permit No: M1981302
• IBM Index Class Name: Revision
• Doc Name: AFFIDAVIT OF JON R FORD PE
• Type & Sequence: AM2
• Media Type: D
• Archive: No

Affidavit of Jon Ford, P.E.
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through the remaining aquifer,or from surface water runoff. Intercepting ground water would lower
the water table off-site in the vicinity of the ponds. Evaporation of water from the ponds would then
have had a depletive (negative) effect on the ground water system. Removing ponds in the
amendment means the water table may be slightly higher within the mined area and the evaporation
loss will be less. This will positively impact the hydrologic system off-site.
8. Deepening the surface water drainage ditch will intercept ground water flowing
through the remaining thin layer of sand and gravel that would have otherwise been intercepted by
the pit lakes. There will be essentially no change in the ground water table elevation in the
remaining aquifer as contemplated in either the currently approved reclamation plan or the proposed
plan amendment where the surface water drainage ditch is concerned. In the plan amendment.
evaporative loss of ground water from the pit lakes will be avoided.
9. The surface water drainage ditch will extend into impermeable shale. See Figure 1.
The depth of the surface water drainage ditch beyond the bottom of the remaining sand and gravel
deposit does not increase the amount of ground water the ditch will intercept because essentially no
ground water is flowing in the shale.
10. While some lowering of the water table outside the mined area would be expected
under both the approved plan and the amended plan,neither plan will significantly impact the ground
water system outside the permit boundary.
11. Since the mined areas outside the berm have been either backfilled completely with
fines or mostly with fines and converted to wetlands, the water table in these areas has returned to
essentially pre-mining conditions.
12. The water table north of the site was lowered by historic sand and gravel mining that
occurred outside the permit boundary. Mining at the Deepe Farm Pit has not impacted the water
table to the north of the site.
13. The band where permanent dewatering has occurred is limited to that area starting
at the northeast comer of Stage 4 and running parallel to the berm on the east side of the site
southeast to northeast. In 1988, LRCWE estimated a slight cone of depression would form in an
area extending 300 feet outside the limit of mining. Because impermeable shale was encountered
at shallower depths than anticipated at the site,the lateral extent of this band is less than expected.
14. Around the southeast and east sides of the berm, the lateral extent of the band has
been reduced to approximately 200 feet wide and around the east and northeast side of the berm
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