PERMFILE65789

• Permit No: M1999002
• IBM Index Class Name: Permit File
• Doc Date: 4/26/1999
• Doc Name: PRELIMINARY RESPONSE PLAN
• Media Type: D
• Archive: No

3.1 Stormwater Pollution Prevention Plan (SPPP)
SPPPs are required as part of the National Pollution Discharge Elimination System
(NPDES) permit for the discharge of stormwater. Discharges of stormwater are defined
as any point source that is used for collecting and conveying stormwater and that is
located at an industrial plant or directly related to manufacturing, processing, or raw
material storage areas at an industrial plant. The term includes, but is not limited to,
stormwater discharges from drainage areas in which are located: industrial plant yards,
immediate access roads and rail lines, drainage ponds, material handling sites, refuse
sites, sites used for the application or disposal of process waters, sites used for storage
and maintenance of material handling equipment, site that are or have been used for
residual treatment, storage or disposal, dust or particulate generating processes (e.g.,
stack emissions or process dust that settles on plant surfaces), shipping and receiving
areas, manufacturing buildings, storage areas (including tank farms) for raw materials,
and intermediate and finished products, and areas where industrial activity has take
place in the past and significant materials remain and are exposed to stormwater. (See
40CFR 122.26 for a more complete definition.) The stormwater regulations apply to
mines if runoff contacts overburden, raw material, intermediate or finished product, or
waste products, and leaves the site. However, if all runoff from the mine is contained
on the site with no discharge offsite, a stormwater permit is not required. In Colorado,
the Department of Public Health and Environment (CDPHE) has the authority to
enforce NPDES programs. The CDPHE Water Quality Control Division stormwater
regulations are found under SCCR 1002-2, 6.1.0.
Industrial facilities in Colorado that discharge process water or stormwater to waters of
the State must apply for a discharge permit with the CDPHE. Facilities that fall under
certain Standard Industrial Classification (SIC) Codes may apply for a general permit.
In Colorado, the SPPP is called a stormwater Management Plan (SWMP). Development
and implementation of the SWMP is one of the main permit requirements.
For stormwater purposes, the Piceance Site is divided into two areas: the initial
processing area and the well field area. Stormwater runoff from the initial processing
facility will be routed to a 1-acre, on-site stormwater retention pond. Stormwater runoff
of the well field portion of the Piceance Site will follow natural drainages. The retention
pond has been designed to contain the 100-year, 24-hour precipitation event, plus an
additional 50 percent of the precipitation event, plus the volume of the largest on-site
storage container. The facility will be equipped with pumps capable of purging the
pond and storing the water in on-site tanks, if necessary. Sampling from this pond
prior to discharge to water of State will not be required because there are no non-
stormwater components to this discharge.
At the Parachute Site, stormwater runoff from processing and material handling areas
will be routed to a 1-acre, on-site stormwater retention pond, and stormwater runoff
from other non-processing areas will be discharged to a Parachute Creek outfall. The
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Preliminary Response Plan
Yankee Gulch Sodium Minerals Protect
Amencan Soda, L.L.P.