PERMFILE71382

• Permit No: M2007003
• IBM Index Class Name: Permit File
• Doc Date: 3/14/2007
• Doc Name: Additional Items for Adequacy Review
• From: AG Engineering
• To: DRMS
• Media Type: D
• Archive: No

COLORADO DEPARTMEK! OF PUBLIC HF.ILTH AND ENVIRONMEN!', Winer Qudiry Control Divista~
.Rationale -Page 3. Pemtit No. COGSaQ70a
Y. TERMS AND CONDITIONS OF PERMIT
A. Process Water Discharees
J. Numeric Limitadons: Numeric limits will6e applied for some afthe industrial categories covered by This permit These
limits are from the EPA Federal Guidelines for the applicable point source category, as follows:
a. Mineral mining and processing point source category- 40 CFR 436-subpartB(crushedstane),C(constructionsand
and gravel), R (phosphate rock) -and all other industrial facilities covered under SIC Code /4, except those
specifically listed in paragraph b below, and concrete and asphalt batch plants located at any facility otherwise
covered by this general permit.•
Table RI -E~IuentLimits
Parameter Limit Rationale
Flow, MGD Report a/ NA
TSS, mg/1 30/45 b/ State Effluent Reguladons
oH,s.u. 6,5-9.0 d Water Quality Standards
Oil and Grease, mgQ 10 d/ State Effluent Regulations
Total Dissolved Solids,mg/1 Report d/j1 SalintryRegulations
Total Phosphorus (as P), mg/1 Report d/e/ Various Phosphorus Regulations
''Llineralminingandprocessingpointsourcecategory-40 CFR 436-subpartAl(graphite): Thedischargeofprocesswastewaterfromgraphite
mines is not covered by this permit (See Section tr.A.2.d ojthe Rationale.)
b. Mineral mining and processingpointsourcecategory-40 CFR 436-subpartD(industrialsand)(esceptjarprocess-
generated wastewater from facilities employing HFfloatation):
Table V-2 -- Effluent Limits
Parameter Limit Rationale
Flow, MGD Report a/ NA
TSS, mg/l 15/45 b/ Best Practicable Technology
pH, s.u. 6.5-9.0 d Water Quality Standards
Oil and Grease, mgR 10 d/ State E,Qluent Regulations
Total Dissolved Solids, mg/l Report d/fl Salinity Regulations
Total Phosphorus (as P), mgQ Report d/g/ Various Phosphorus Regulations
~ 30-DayAverage/Daity Maximum d/ Daily Mrut
~ 30-DayAwmge'/-DayAwerage r/ Ste Y.A.I.i
tl Minimum-Maximum j/ See V.A.3.b.
c. No process water dischargewil/becaveredunderthrspermitarauthorizedbycertificationjordischargeswiththemirteral
mining and processing point source category of 40 CFR 436 -subparts E (gypsum), F (asphaltic mineral), G (asbestos amt
wollastonite), J(barite), K (/luorspar), L (sa/tnesfrom brine lakes), M(borax), N(porash), O(sodiumsuljate), V (bentonite),
W (magnesite), X (diatomite), Y (jade), Z (novaculiteJ, and AF (lripoli).
Discussion oftimitations:
a. Exceptions to Federal Limits: The 40 CFR 436 includes some e,~luenr limitations, which are oat as strict as, those listed
here. Forexample,thephosphaterockTSSlimitislessstricr,andformanyofthesubcategorles,whichstate"noduchorge
ofprocess wastewater, "an exemption to that limit rs provided during certain precipitation evenu and in conjunction with
other conditions. However, this permit does not include these relaxed limits. This is a genera! permit, designed m cover the
widest possible range ojfaciltNes with similar wastewater characteristics. In effectively achieving this brood rnverage, the
permit must also be relatively simples Therefore, some of the more individualistic or complex permit limitations are not
included in this permit.
The Division does not believe that there are a sufficiently large number ojsuch facilities in Colorado to warrant including
the exemptions in this general permit. Ija permitree wishes to take advantage ofthese exemptions, the perminee musiapply
for an individual permit.