Exhibit D Discharge Goals.pdf
PDF 97 KB Posted
- Attached to
- Captain Jack Mill Superfund Site O & M
- Solicitation number
- RFP FAAA 2026000184 2
- Issued by
- Arapahoe County, Denver City, Colorado
About this file
This is an Exhibit D document detailing discharge goals and effluent limitations for the Captain Jack Mill Superfund Site Operations and Maintenance project in Colorado. The document establishes water quality monitoring and reporting requirements for facility discharge, with parameters divided into two seasonal periods: Low Flow Season (October through April) and High Flow Season (May through September). Monitoring requirements include continuous recording of effluent flow rates and daily pH measurements via grab samples, with monthly grab samples required for suspended solids, metals (including arsenic, cadmium, chromium, copper, lead, nickel, zinc), sulfate, sulfide, and thallium concentrations. Whole effluent toxicity (WET) testing is required semi-annually during both seasons. The Low Flow Season permits a maximum effluent flow of 0.046 million gallons per day with specified 30-day average and 7-day average concentration limits, while the High Flow Season allows up to 0.1296 million gallons per day with proportionally higher concentration thresholds across all monitored parameters.
The discharge goals reflect water quality standards appropriate to seasonal hydrologic conditions, with significantly higher permitted concentrations during the high flow period due to increased dilution capacity. Oil and grease parameters require both visual monthly reporting and contingent grab sampling with a 10 mg/l maximum concentration limit. The document does not include pricing information, contract term details, set-asides, or funding sources, as it serves solely as a technical specification exhibit establishing the quantitative and qualitative requirements for ongoing environmental monitoring and discharge compliance at the facility.
View the file
Other files
On GovTribe
Work with this file
- Download the original file
- Contacts named in this file
- Similar government files
- Ask GovTribe AI about this file
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
File details come from the government source that posted it. Updated .