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TABLE OF CONTENTS CHAPTER 16 SMALL WASTEWATER TREATMENT PLANTS

TABLE OF CONTENTS

CHAPTER 16
SMALL WASTEWATER TREATMENT PLANTS



NUMBER SECTION








PAGE

16.1
PURPOSE
16-1

16.2
SUBMITTAL
REQUIREMENTS
16-1

16.2.1
Concept
Plan
Submittal 16-1

16.2.2 Preliminary Design and Final Design Submittals


16-4

16.3
DESIGN
APPROACH 16-5

16.3.1 Compliance with Area Sanitary Plans



16-5

16.3.2
Approvals
16-5

16.3.2.1 MSD-Owned
Facility
16-5
16.3.2.2 Privately-Owned
Facility
16-6
16.3.2.3 Permits 16-6
16.3.2.4 Waste
Load
Allocation 16-6

16.3.3
Service
Level
16-7

16.3.4
Justification
16-7

16.3.5
Variances
16-7

16.4
DESIGN
CRITERIA
16-8

16.4.1
General 16-8

16.4.2
Process 16-9

16.4.2.1 Influent
Pumping
16-9
16.4.2.2 Comminutors
16-10
16.4.2.3 Bar
Screens
16-10
16.4.2.4 Preliminary
Treatment 16-11
16.4.2.5 Flow
Equalization
16-11
16.4.2.6 Aeration 16-11
TABLE OF CONTENTS (cont.)

CHAPTER 16
SMALL WASTEWATER TREATMENT PLANTS



NUMBER SECTION








PAGE

16.4.2.7 Clarification
16-14
16.4.2.8 Tertiary
Treatment
16-15
16.4.2.9 Disinfection
16-16
16.4.2.10
Flow
Metering
16-17
16.4.2.11
Post
Aeration
16-17
16.4.2.12
Biosolids
Holding
Tank
16-18

16.4.3
Site
Features
16-18

16.4.3.1
Access Roads and Walkways


16-18
16.4.3.2 Fencing 16-19
16.4.3.3 Site
Drainage
16-19
16.4.3.4 Landscaping
16-19

16.4.4
Building
Features
16-20

16.4.4.1 Equipment
Buildings
16-20
16.4.4.2 Hoists
16-21
16.4.4.3 Plumbing
16-21
16.4.4.4 HVAC
System 16-23
16.4.4.5 Electrical
System
16-28

16.4.5 Safety Requirements
16-34

16.4.5.1 Codes
16-34
16.4.5.2 Machinery
Guards
16-34
16.4.5.3 Railing
16-34
16.4.5.4 Stairs
and
Ladders
16-34
16.4.5.5 Walkways
and
Grating 16-34
16.4.5.6 Electrical
Safety
16-35

16.5
OPINIONS
OF
COST
16-35

16.5.1
Opinions
of
Capital
Cost
16-35

16.5.2 Opinions of Operation and Maintenance Cost


16-35

Effective:
January
1,
2001 16-1
CHAPTER 16
SMALL WASTEWATER TREATMENT PLANTS



16.1 PURPOSE

This chapter:

a.
Identifies the planning and design approach to be used for small wastewater
treatment plants(WWTP) with maximum capacities of 500,000 gallons per day.
This guide pertains to new plants and expansion of existing plants.

b.
Defines specific criteria by which small WWTPs will be designed.

c.
Delineates submittal requirements to MSD for review and approval of small
WWTPs.

d.
Delineates requirements for opinions of construction and operating costs.

16.2 SUBMITTAL
REQUIREMENTS

The Design Engineer shall submit to MSD for review and approval, the Concept Plan,
Preliminary Design and Final Design. Approval by MSD will be required prior to
authorization of any succeeding design phase.

The Design Engineer shall submit to the Jefferson County Health Department and
Kentucky Department of Housing for review and approval of the Final Design. The
submittal shall include the standard single submission form. Approval by these agencies
will be required prior to authorization of any construction.

Submittals shall be prepared in report format (8.5-inch x 11-inch) and shall be spiral
bound, three-ring bound or bound, in some other permanent manner. Appended to or
included in the bound submittal shall be maps, figures, and drawings as necessary.
Sections are to be organized and tabbed according to the requirements of this section.

16.2.1 Concept Plan Submittal

The purpose of a Concept Plan is to provide MSD with preliminary design data
for the proposed facility to determine the compatibility of the proposed facility
with approved Watershed 201 Facility Plans and MSD's Area Action Plans, and to
justify construction and operation of the proposed facility.

Concept Plans relating to small WWTPs shall include the following elements:


Effective:
January
1,
2001 16-2
a.
A narrative description of the proposed service and drainage areas that can
be served with the proposed facility. Include a description of existing
developments that can be served by the proposed facility or facility
expansion.

b.
A description and reference to any Action Plan requirements that relate to
the proposed service area (on-site area to which service will be initially
provided) and drainage areas (off-site areas that can be served in the future
with the proposed facility).

c.
The designated land use for the proposed service area and drainage areas.

d.
Population and flow projections for the proposed service area and drainage
areas.

1. Existing
Facilities - If the project involves an existing facility,
provide metered plant flow data. The metering period must meet
the following requirements:

a)
Measured after current service area was connected to the
treatment facility. If additional connections have been
added since the most recent flow measurement, the flow
must be remeasured.
b)
Consist of at least seven consecutive days; actual
requirement will be site-specific and as approved by MSD.
c)
Include enough flow data during and after rainfall events to
show the severity of infiltration/inflow (minimum of 1 inch
of rain at the treatment plant during 24 hours); provide the
rainfall data during metering period and the previous week.

Provide certification as to the amount of rainfall during
each 24-hour period. Certification shall include a rain
amounts at the site and rainfall information from a local
weather service such as the airport.

Some flow data may be available from existing MSD flow
meters. Also, account for reserve capacity at the plant.

2.
Contribution from New Development - Define the buildings:

a)
Residential - Note number of single or multi-family units. If
multi-family, break down by number of one, two, and three
bedrooms.

Effective:
January
1,
2001 16-3
b)
Commercial - Note the square-footage of floor space and
expected tenants or type of use along with an estimate of
the amount of wastewater that will be generated.
c)
Industrial - Note the nature of the processes employed and
of the wastewater generated.

If the proposed commercial or industrial client has an
existing comparable location served by the Louisville
Water Company, provide that address. If not, provide
records on the previous 12 months of water consumption
(or wastewater discharge, if significantly different than
water consumption).

3.
Expected Influent Quantity and Quality - For new facilities provide
estimated:

CBOD5 (milligrams per liter (mg/L))
TSS (mg/L)
NH3-N (mg/L)
Average Daily Flow Rate (GPD)
Peak Daily Flow Rate (GPD)
Peak Hourly Flow Rate (GPD)

Note: For facilities that will treat wastewater from industrial
facilities, consult MSD for additional requirements.

e.
A description of alternative means of sanitary sewer service considered.

f.
A recommended plan, including timetable, for the provision of sanitary
sewer service to the area including connection of developed or
undeveloped areas. The recommended plan should include preliminary
drawings to illustrate proposed collection and treatment facilities.

For the treatment facility, a site plan should be included to show, on not
less than a 1"=200 scale, contours, the 100-year floodplain, the proposed
facility location, the land set aside for future expansions, adjacent
properties, and the proximity of existing or proposed homes.

A minimum 200-foot buffer is required between the property line and any
existing, proposed, and future treatment facility buildings and basins. On
new developments, buffer requirements shall be included on the recorded
plat.


Effective:
January
1,
2001 16-4
For components of the facility within the floodplain and floodway,
approval letters from the Kentucky Division of Water, Floodplain
Management Section, or in some instances, the U.S. Army Corps of
Engineers will be required. A copy of the approval letters should be
submitted as early as is possible in the pl