PERMFILE43804

• Permit No: m2004044
• IBM Index Class Name: Permit File
• Doc Date: 11/22/2004
• Doc Name: Adequacy Review Response
• From: Tetra Tech RMC
• To: DMG
• Media Type: D
• Archive: No

TETRATECH RMC Mr. Larry Oehler
Adequacy Response M-2004-044
November 22, 2004
Page 14 of 20
The areas to be reclaimed as upland or wetlands as shown on the reclamation plan
are for Aggregate Industries use only, they are not mitigation wetlands. Once
mined, these areas will be backfilled with silts or wash fines from the processing
area. Silt basin wetlands can be successfully established using wetlands seed
mixes. The Reclamation Cost estimate for bonding includes a cost for wetlands
seed in Phase 1.
14. Almost 76% ojthe wet meadow seed mix in your plan is Rocky Mountain Iris.
This plant is marginally suited for the area and the NRCS recommends that the
percentage of the mix for this plant be reduced to S - 10 percent. Incorporate
this recommendation into the seed mix and adjust the seeding rates for the
remaining species in the mix accordingly, or explain why this recommendation
will not be followed.
The 76% in the original table was based on weight. The wetland seed mix table
on the Reclamation Plan has been corrected.
15. The Division and the NRCS recommend that seeding of reclamation species be
done between November 1°` and April30`~. Please incorporate these seeding
dates into your plan or provide another range of seeding dates and explain why
they are proposed.
Aggregate Industries agrees with the NRCS recommendation, however
occasionally weather conditions, such as a wet spring, may hinder seeding and
increase erosion during these months. A greater window of flexibility is needed
for seeding. We have added a note on the Reclamation Plan Maps "Seeding will
be done during the first favorable seeding season following topsoil placement.
Based on recommendation of the NRCS, it is anticipated that seeding will be done
between November 1 s` and April 30t~, unless weather conditions require seeding
outside these months."
16. The Division and the NRCS recommend that 4,000 pounds per acre of certified
weed free straw crimped into the soil be used as a mulch to help with the
establishment of reclamation species on the 3h : Iv slopes. Please commit to
this recommendation or explain why it will not be used.
We have added a note on the Reclamation Plan Maps, "Certified weed-free straw
crimped into the topsoil will be used where grasses will be established above the
high water line on the reservoir side slopes, or new seeds will be planted into a
cover crop."
17. Your configuration for some, if not al[, stockpiles of topsoil is 300 feel long 100
feet wide and 30 feet high, with 1 h : 1 v side slopes. Such long steep unprotected
slopes would be very erosive. Rule 3 Section I.9(3) states "topsoil shall be
H:~3919_019_Ol\MLRB\DMG Response\ls[ Adequacy Response to DMG I 1-5-04.doc