C153773 Feasibility Study

• Contract/PO #: C153773
• Contractor Name: Morrison, Town of
• Contract Type: Loan
• Water District: 9
• County: Jefferson
• Bill Number: HB 95-1155
• Loan Projects - Doc Type: Feasibility Study

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Some deficiencies were itemized in the Comprehensive Performance Evaluation (CPE)(17l.
Significant items relative to facilities (not operation) needing improvement are:

a. Disinfection. Adequate contact time or alternative disinfection. This was identified as
a major deficiency by the CPE.

b. Reliability. The plant was designed to be expanded and has only one unit for each
process. A permanent plant, expanded to operate continuously on a long-term basis,
should have at least two units for each important process.

c. Corrosion Control. Chemical feed system not available for corrosion control.

d. Chemical Feed Improvements. PrOVide additional and alternative chemical injection
points.

e. Trace OrganicsfTaste and Order COl1trol. There is a need to efficiently feed activated
carbon - or adopt an alternative process to address this problem.

f. Laboratory/Office Facilities. Additicmal laboratory space is needed. Toilet facilities
should be available. A process monitoring and control center is needed.

g. Wastewater Handling. Provisions fo~ decant recycling and for wasting sludge solids is
needed. The present pond is inadequate under today's regulatory requirements.

h. Sedimentation Efficiency. The CPE indicated that the basic processes had 0.5 MGD
capacity except for sedimentation (given as 0.31 MGD). We disagree with their rationale
- it is our opinion that the module siZing is adequate at 0.5 MGD. However, there is a
problem with the baffles for the tube settler which results in inefficiencies due to short-
circuiting. Either baffling should be changed or an absorption clarifier installed.

The expansion/improvement project designed in 1985 would have expanded the plant to a
nominal capacity and corrected essentially all of the listed deficiencies.

Alternate C-1
This alternate assumes that all treatment capacity would be developed at the present site.
Planned facilities at this site would be:

7D-080.035:MSTR-PlN

111-17