Exhibit D Discharge Goals.pdf
PDF 97 KB Posted
- Attached to
- Captain Jack Mill Superfund Site O & M
- Solicitation number
- RFP FAAA 2026000184 3
- Issued by
- Boulder County, Denver City, Colorado
About this file
Exhibit D establishes discharge goals and effluent limitations for the Captain Jack Mill Superfund Site in Colorado, specifying effluent parameters, monitoring requirements, and maximum concentration limits across two seasonal periods. The document defines discharge standards for the low flow season (October through April) and high flow season (May through September), with effluent flow rates of 0.046 million gallons per day and 0.1296 million gallons per day respectively. Monitored parameters include pH, total suspended solids, oil and grease, and various trace metals including arsenic, cadmium, chromium, copper, iron, lead, manganese, nickel, selenium, silver, zinc, sulfate, sulfide, and thallium. All parameters require either daily, monthly, or semi-annual sampling using grab samples or continuous recorders, with frequency and sample type specified for each pollutant.
The discharge limitations vary seasonally to account for water flow conditions, with notably higher concentration limits during the high flow season for most parameters. For example, cadmium limits increase from 1.5 to 6.6 micrograms per liter (30-day average), and nickel limits increase from 33 to 143 micrograms per liter during high flow periods. The document also mandates whole effluent toxicity testing on a semi-annual basis. These effluent goals and limitations appear to be regulatory requirements established to ensure the operation and maintenance activities at the superfund site remain in compliance with applicable environmental protection standards.
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Text version
Low Flow Season: October – April – Discharge Goals
Effluent Parameter
Effluent Limitations Maximum Concentrations
Monitoring Requirements
30-Day Average
7-Day Average
Daily Maximum Frequency Sample Type
Effluent Flow (MGD) 0.046 Report Continuous Recorder pH (su) 6.5-9.0 Daily Grab
TSS, effluent (mg/l) 30 45 Monthly Grab
Oil and Grease (visual) NA Report Monthly Visual
Oil and Grease (mg/l) NA 10 Contingent Grab
As, TR (µg/l) 50 NA Monthly Grab
As, PD (µg/l) NA 340 Monthly Grab
Cd, PD (µg/l) 1.5 2.1 Monthly Grab
Cr, TR (µg/l) Report Report Monthly Grab
Cr+3, TR (µg/l) NA 50 Contingent Grab
Cu, PD (µg/l) 5.6 8 Monthly Grab
Fe, Dis (µg/l) 1178 NA Monthly Grab
Fe, TR (µg/l) 1000 NA Monthly Grab
Pb, PD (µg/l) 1.4 36 Monthly Grab
Mn, Dis (µg/l) 1376 2490 Monthly Grab
Ni, PD (µg/l) 33 295 Monthly Grab
Se, PD (µg/l) 4.6 18 Monthly Grab
Ag, PD (µg/l) 0.029 0.8 Monthly Grab
Zn, PD (µg/l) 74 74 Monthly Grab
Sulfate (mg/l) 318 NA Monthly Grab
Sulfide as H2S (mg/l) 0.002 NA Monthly Grab
Thallium, (Tot) (µg/l) 0.24 NA Monthly Grab
WET, Testing Semi-
Annually Grab
High Flow Season: May – September – Discharge Goals
Effluent Parameter
Effluent Limitations Maximum Concentrations
Monitoring Requirements
30-Day Average
7-Day Average
Daily Maximum Frequency Sample Type
Effluent Flow (MGD) 0.1296 Report Continuous Recorder pH (su) 6.5-9.0 Daily Grab
TSS, effluent (mg/l) 30 45 Monthly Grab
Oil and Grease (visual)
NA Report Monthly
Visual
Oil and Grease (mg/L)
NA 10
Contingent
Grab
As, TR (µg/l) 220 NA Monthly Grab
As, PD (µg/l) NA 1496 Monthly Grab
Cd, PD (µg/l) 6.6 9.2 Monthly Grab
Cr, TR (µg/l) Report Report Monthly Grab
Cr+3, TR (µg/l) NA 220 Contingent Grab
Cu, PD (µg/l) 18 28 Monthly Grab
Fe, Dis (µg/l) 4836 NA Monthly Grab
Fe, TR (µg/l) 4036 NA Monthly Grab
Pb, PD (µg/l) 6.2 158 Monthly Grab
Mn, Dis (µg/l) 6037 10939 Monthly Grab
Ni, PD (µg/l) 143 1296 Monthly Grab
Se, PD (µg/l) 20 81 Monthly Grab
Ag, PD (µg/l) 0.13 3.5 Monthly Grab
Zn, PD (µg/l) 247 247 Monthly Grab
Sulfate (mg/l) 1382 NA Monthly Grab
Sulfide as H2S (mg/l) 0.0088 NA Monthly Grab
Thallium (TR) (µg/l) 0.83 NA Monthly Grab
WET, Testing Semi-
Annually Grab
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