HomeMy WebLinkAboutAmendment 2 to PSA for Waste Water Treatment Plant Phase 1 Improvements, HDR Engineering.pdf
Commission Memorandum
REPORT TO: Honorable Mayor and City Commission
FROM: Bob Murray, Project Engineer
Rick Hixson, City Engineer
SUBJECT: 2007 WRF Upgrade – Phase I Expansion Project Amendment No. 2
MEETING DATE: July 16th, 2012
AGENDA ITEM TYPE: Consent
RECOMMENDATION: Approve and authorize City Manager to sign Amendment No 2 to the
Professional Services Agreement.
BACKGROUND: Attached is a copy of the partially executed Amendment No. 2 with HDR
Engineering, Inc. for the 2007 WRF Upgrade – Phase I Expansion Project.
The Montana DEQ is preparing to issue the findings of its TMDL (Total Maximum Daily
Loading) Study of the East Gallatin River for nitrogen and phosphorus. This draft document contains nutrient loading targets for the stream segment immediately downstream from
Bozeman’s Water Reclamation Facility outfall which are exceptionally low and which could
ultimately impact whether the City of Bozeman is permitted to discharge its treated effluent into
this receiving stream in the future.
Staff is concerned that the entire stream sampling data set on which this TMDL study was based
came from river samples which were collected before Bozeman’s new Biological Nutrient
Removal facility came on line. Furthermore, the wasteload allocations for the East Gallatin
River were created in the absence of a stream model.
In addition to the much higher quality effluent now being discharged from Bozeman’s Water
Reclamation Facility, the physical location of the outfall has also been moved upstream since
sampling occurred. Therefore the existing database is unrepresentative and may not accurately
reflect Bozeman’s actual impact on the East Gallatin River.
The intent of this professional services agreement is to conduct additional stream sampling to enlarge the existing data base, analyze this new data, and more accurately assess the impact our plant discharge has on the water quality of the East Gallatin River by inputting this data into a
computer-based stream modeling software package called QUAL2K.
UNRESOLVED ISSUES: None
ALTERNATIVES: As suggested by the City Commission
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FISCAL EFFECTS: If approved, this amendment will decrease the contingency on the phase
I portion of the project from $1,444,071.99 to $1,424,071.99.
Attachments: Amendment No. 2
Report compiled on: 7/2/12
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