Last month the Winona City Board of Adjustment voted in favor of the request but the local group, Citizens Concerned About Sand Mining (CASM), filed an appeal.
Jane Cowgill with CASM told the council the group's concerned about the potential dangers of increased truck traffic.
Cowgill also questioned the fairness of the Board of Adjustment approving the request because Chair Chris Sanchez ended up abstaining from the vote after revealing his wife's company does business with C-D Corp.
The C-U-P allows CD Corp to double the number of frac sand barges leaving the city's port from 24 to 48 barges per month and decreases the moisture level required of sand used from 4% to 1.5% .
Dan Nisbit, co-owner of CD Corp, told the board their operations need to expand to attract more business.
Councilman Gerry Krage cast the lone no vote for the amended C-U-P.