HomeMy WebLinkAboutNC0004952_staff comments_19950615DIVISION OF ENVIRONMENT MANAGEMENT
June 15, 1995
MEMORANDUM
TO: Susan Wilson
THRU: Ruth Swanek'2'- )
Carla Sanderson('
FROM: Jacquelyn M. Nowell-il
SUBJECT: Relocation of outfall pipe for Hoechst -Celanese
NPDES Permit No. NC0004952
County
The Instream Assessment Unit has reviewed the request for relocation of the outfall
pipe by the subject facility. The relocation of this pipe approximately 800 ft upstream from
the existing discharge point would have no significant difference in the streamflows of the
two sites. This would have no effect on the currently permitted effluent and OCPSF
guidelines or chronic toxicity test. We recommend approval of the outfall relocation for the
Hoechst -Celanese facility. (Note: The proposed discharge for Grover Industries,
NC0083984, will be located approximately 0.4 miles downstream of the relocation site.)
cc: Rex Gleason
WLA File
Hoechst Celanese
May 10, 1995
KIF:95:011
Mr. Dave Goodrich
DEHNR
Division of Environmental Management
Water Quality Section
P.O. Box 29535
Raleigh, NC 27626-0535
SUBJECT: Request to change permitted outfall location
Request clarification of sample type in permit
NPDES Permit No. NC0004952
Dear Mr. Goodrich:
Textile Fibers
Hoechst Celanese Corporation
PO Box 87
Shelby, NC 28151-0087
704 482 2411
This letter discusses two issues of concern to the Hoechst Celanese Corporation (HCC) Shelby
Plant: 1) the location of the wastewater treatment plant's NPDES-permitted outfall and 2) sample
type specification for several organic analytes listed in the site's NPDES permit.
First, the Hoechst Celanese Shelby site requests approval from NCDEHNR to change the site's
NPDES-permitted wastewater treatment plant outfall location. The current outfall discharges
into Buffalo Creek, which is classified Class C waters in the Broad River Basin. The proposed
outfall would discharge into Buffalo Creek approximately 775 feet upstream of the current
outfall location. Both the current outfall and the proposed outfall are shown on the enclosed
topographic map. The current outfall has the following disadvantages:
• The current outfall piping runs along the creek bank for approximately 945 feet; several
washouts of the creek banks have occurred in the past. Without the proper support of the
creek bank, the outfall piping sags and becomes pinched or ruptures. Each time a washout
occurs in the area of the piping, Hoechst Celanese repairs the washout and any pipe damage.
• The current outfall discharge is difficult to reach and visually monitor because of heavy
riparian growth.
• The Buffalo Creek sampling point downstream of the current outfall is not located on HCC
property.
The proposed outfall is superior to the current outfall because:
• The proposed outfall piping would run along the creek for only about 175 feet and be
supported by a reinforced wall, thus being less affected by washouts.
The proposed outfall would be easily viewed and accessed by Hoechst Celanese employees.
• ` With the proposed outfall, all monitoring points are located on Hoechst Celanese property.
The proposed outfall will be a 12 inch pipe which extends out over the creek about 3 feet and as
raised above the creek about 2 feet The current outfall piping would be abandoned in place.
The current outfall is located approximately -450 feet downstream of the plant's process water.
intake as shown on the topographic map.: The plant draws an average of 980,000 gallons': of
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