HomeMy WebLinkAboutProfessional Service Agreement for WWTP Noise/Odor Study
City of Meridian
Public Works Dept.
RECEIVED
FES 0 6 200~
Cítv Or:Merídian
Cí(y Clerk Office
Memo
To: Mayor de INeerd & City Council
From: Brad Watson, P.E.
CC: Fde, Gary Smith, PE, City Clerk
Date: 1122103
Re: January 27 City Council Meeting Agenda Items
The Public Wor1<s Deparbnent respectfully requests that the following item be placed on the
February 10 City Council agenda, under Public Works Department Reports, for Council's
consideratiOn:
Aareement for Professional Services. WWTP Noise & Odor StIJdv - Carollo
Enaineers. Carollo Engineers submitted a final draft of a Noise & Odor Study to us
which I have reviewed. I also foIwarcled the agreement to Anna Powell and
discussed the study with her. I will ask Carollo Engineers to have frequent check.in
meetings with us (including P & Z staff) so that the information they are providing is
useful in the eventual evaluation of land uses around the WWTP. Public Wor1<s will
work closely with P & Z so that useful land use recommendatiOns or, at a minimum,
ideas can be presented to Mayor and Council.
At my request, Carollo has added Task 2.1, Odor Control Reference Standards and
Policies, In which they WIll conduct a literature search and telephone intelviews to
deteJmine what other sewerage agencies are doing In terms of land use.
The agreement represents Task Order No.4 of the existing VVWTP Facility Plan
Update Study and is technically a change order. The agreement Is on a time-and-
materials basis, not to exceed $64,000.
Recommended CouncU Action: Approve the agreement with Carollo
Engineers for the WWTP Noise & Odor Study on a tIme-and-materials basis,
not to exceed amount of $64,000, and authorize the Mayor to sign and City
Clerk to attest
Thank you for your consideration.
8 Page 1
TASK ORDER NO.4
CITY OF MERIDIAN (OWNER)
AND
CAROLLO ENGINEERS, A PROFESSIONAL CORPORATION (ENGINEER)
This Task Order is issued by the OWNER and accepted by the ENGINEER pursuant to
the mutual promises, covenants and conditions in the Agreement between the above
named parties dated the 23rd day of July, 2002, in connection with: The Wastewater
Treatment Plant Facility Plan Update Project (Project).
PURPOSE
The ENGINEER's scope of services, time of completion and compensation shall be as set
forth herein. Services shall be generally described as an assessment of the potential for
off-site impacts from odors and noise originating from the OWNER's wastewater treatment
plant.
ENGINEER'S SERVICES
Project shall be referred to as the wastewater treatment plant odor and noise mitigation
study.
TASK 1- PROJECT MANAGEMENT
, ENGINEER will provide the following project management services for the duration of the
project:
1.1 - Management. Manage the efforts of the project team members and subconsultants,
assign manpower, delegate responsibilities, review work progress, and communicate with
the City,
1.2 - Project Meetings. Schedule and attend project meetings with the City. The
proposed schedule includes the following meetings:
D Two preliminary meetings during the evaluation phase.
D One review meeting of the final report.
TASK 2. ODOR CONTROL EVALUATION
This task includes investigation and assessment of potential odor sources and
presentation of control alternatives.
2.1 - Odor Control Reference Standards and Policies- ENGINEER will conduct a brief
literature search and telephone interviews to summarize example odor control
performance criteria adopted by municipal sewerage agencies in other regions. Odor
performance criteria will summarize the allowable odor concentration and frequency under
the adopted standards, with reference to the land uses surrounding the wastewater
treatment facilities. Available monitoring procedures and other public relations measures
and policy guidelines will also be reported.
2.2 - WWTP Odor Source Assessment. ENGINEER will summarize the potential WlNTP
odor sources and the potential odor producing compounds, or the "type" of odors; the
conditions contributing to odor production; and the expected odor concentration ranges.
The odor potential from the existing wwfP as well as the expanded unit processes
recommended in the Wastewater Facility Plan will be addressed.
2.3 . Odor Control Perfonnance Criteria. ENGINEER will define three levels for odor
control performance criteria, as adjusted odor units in terms of Dilutions to Threshold
(D/T), with the maximum annual frequency, in accordance with American Society for
Testing and Material, (ASTM) E 679. Performance levels will be. used to quantify the
expected performance and benefits from odor control alternatives. The three general
levels will be as follows:
. No Action - The base condition of the existing WWTP with no odor control.
. Level 1 - Provide odor containment and control for the most significant odor
sources, considered to be the influent raw sewage and headworks area, and the
biosolids handling processes of the WWTP. This level of odor control is
considered to be appropriate for industrial and non-retail commercial land use.
. Level 2 - Provide odor containment and control from all major components of the
WWTP, including the primary clarifiers, aeration basins, thickening facilities, and
secondary clarifiers, in addition to the provisions in Level 1. This level of odor
control is considered to be appropriate for near-by residential areas, public parks,
and commercial land use.
2.4 - WWTP Odor Dispersion Model. ENGINEER will engage the services of Webster
Environmental Associates, Inc, as a subconsultant, to complete atmospheric dispersion
, modeling to show the predominant dispersion pattern, odor concentrations, and annual
. frequency distribution of odors from the existing WWTP, assuming the most-probable
odor concentrations with no odor control measures. Dispersion modeling will apply the
Breeze ISC model (Version 4.0.4) with meteorological data from the EPA SCRAM website
for the nearest available weather station. Results from the dispersion model will be shown
on an aerial map with the probable odor impact at the wwfP property line and the
surrounding area. The WWTP odor impact with Level 1 and Level 2 odor control facilities
in-place will also be predicted by the model.
2.6 - WWTP Odor Control Capital Improvements. ENGINEER will describe general
alternatives for odor containment covers, foul air handling, and methods of treatment.
Preliminary capital cost estimates for the improvements will be organized in stages to
attain the Level 1 and the Level 2 performance standard as defined in Task 2.3 for the
existing WWTP and the expansions proposed in the Facility Plan. Conceptual
alternatives will include physical/chemical and biological systems for treatment of gas-
phase odors. The life cycle costs of odor control alternatives will be developed to
compare capital as well as operation and maintenance requirements. Cost-ta-benefit
analyses of the three odor control performance criteria will be displayed using the
atmospheric dispersion model in Task 2.4. A draft Technical Memorandum will be
provided for review, to incorporate the OWNER's comments into the final report.
Preliminary design of the preferred odor control alternatives will be developed with design
criteria, showing basic plan and section drawings and equipment cut-sheets. Final
recommendations will be summarized and can be ammended into the recommendations
and phasing in the Facility Plan.
TASK 3 - NOISE ASSESSMENT
This task includes investigation and assessment of potential noise sources and
presentation of control alternatives.
3.1 - WWTP Sound level Documentation. ENGINEER will utilize the services of
Pritchard White, Ph. D., as subconsultant, to record and document the WWTP sound
levels in decibels and the sound frequencies, to compare to measured ambient noise
levels. The sound will be measured under the expected normal and maximum WWTP
operating conditions, over times when the surrounding neighborhood noises are at the
minimum and maximum. Potential noise sources will include the existing WWTP and
modifications proposed in the Facility Plan.
The one-third octave band spectra and A-weighted noise levels will be measured at
the following locations:
1. NW corner of property
2. SW comer of property
3. Midway along south property line
4. SE comer of property
5. 500 ft S of SE comer of property
6. 500 ft S of Location 3
7. 500 ft S of SW comer of property
8. Near Blower Building
9. Interior WWTP site - exact location to be determined
To document the difference between the WWTP operating conditions and
neighborhood noises at different times, sound level measurements are proposed for
the following times and days:
1. Monday, 11 :00 PM: Quietest neighborhood time, indicative of minimum
ambient noise
2. Tuesday, 12:00 noon: Typical mid-day operation
3. Wednesday, 10:00 - 11 :00 AM: During testing of the WWTP standby
diesel generators and the biosolids dewatering centrifuge
4. Wednesday, 4:00 - 6:00 PM: Normal WWTP operation, with the highest
local traffic noise on Ustick and Ten Mile
ENGINEER will compare the noise measurements at the property to other noise
measurements in the Treasure Valley, and to other noise ordinances from various
cities and counties in the US. An attainable noise reduction goal and maximum
WWTP sound level will be defined, relative to the measured ambient noise.
3.2. WWTP Sound Attenuation Alternatives. ENGINEER will summarize WWTP noise
sources identified from Task 3.1. General noise control alternatives will be presented, to
include WWTP site improvements such as sound panels, and other specific source
control components such as mufflers, silencers, insulation and enclosures. The expected
sound attenuation for each alternative will be identified with preliminary cost estimates. A
draft Technical Memorandum will be provided for review, to incorporate the OWNER's
comments into the final report.
PROJECTDELIVERABLES
Tasks 2 and Task 3 will be presented in the form of one Technical Memorandum ( TM ).
The following deliverables will be prepared as part of the project:
A.
Draft TM, (3 copies) of Task 2 for the odor sources, dispersion model,
conceptual odor control alternatives and preliminary cost estimates, for
OWNER review.
B.
Draft TM (3 copies) of Task 3 for the noise level report, control altematives,
and preliminary cost estimates, for OWNER review.
C.
Final Odor and Noise Mitigation TM (5 copies).
OPTIONAL SERVICES
0-1.0 - Odor Sampling. W'NTP odors are typically highest during the warmer summer
months, This study will assume odor concentrations, typical for normal domestic sewage.
Odor sampling is not included in this proposal, since the completion is anticipated during
I winter and early spring. Odor sampling and analyses can be included in a future task to
verify assumptions used in this preliminary assessment, or to conduct a more thorough
documentation of the odor characteristics and concentrations. Odor sampling can indude
a combination of field measurements, and off-gas sampling for laboratory analyses,
selected on a case-by-case basis.
SERVICES PROVIDED BY OWNER
OWNER will provide access to the W'NTP for the ENGINEER and subconsultants to
conduct all evaluations under this scope. OWNER will also provide available base
maps and aerial photographs.
TIME OF COMPLETION
The estimated schedule for completion is:
Notice to Proceed (NTP)
Draft Odor Control Evaluation
Draft Noise Evaluation
Final TM Odor and Noise Mitigation
(no later than)
60 days from NTP
90 days from NTP
120 days from NTP
COMPENSATION
OWNER shall pay ENGINEER on an hourly basis in accordance with the attached
engineering cost estimate (Exhibit A). Subconsultants shall be invoiced at ENGINEER's
cost plus ten (10) percent. All other direct costs shall be invoiced at the actual cost.
ENGINEER's total compensation for the Scope of Services identified in this Task order
shall not exceed the amount of sixty four thousand dollars ($64,000), without additional
authorization from OWNER. The ENGINEER shall submit monthly statements to the
OWNER based on the ENGINEER's labor and expenses accrued at the time of billing.
OWNER shall make monthly payments in response to ENGINEER's statement.
EFFECTIVE DATE
This Task Order No.~is effective as of the Iv.J!. day of ;;é!:H'ÙIh:J-
20~.
IN WITNESS WHEREOF, duly authorized representatives of the ENGINEER and of
the OWNER have executed this Task Order No. ...!... evidencing its issuance by
OWNER and acceptance by ENGINEER.
CAROLLO ENGINEERS,
A Professional Corporation
OWNER
By:
Partner
By:
Public Works
By:
Partner
By:
Attest'
EXIDBIT A
ESTIMATE OF ENGINEERING COSTS
CITY OF MERIDIAN - PUBLIC WORKS DEPARTMENT
ODOR AND NOISE ASSESSMENT
TASK DESCRIPTION
Task 1 - Proiect Mana.....ment
1.1 .Project tracking and Subconsultattn Coordination
1.2 Project Meetings
Task 2 - Odor Assessment
2.1 Odor Control Reference Standards
2.2 Odor Souroe Assessment
2.3 Odor Control Perfonrumce Criteria
2.4 Odor Dispersion Model
2.5 Odor Control Alternatives
Task 3 - Noise Assessment
3.1 Noise Level Docwnentaion
3.2 Sound AttenuationA1tematives
Final TM Task 2 and Task 3
TOTALS
Personnel Classification
LABOR MANHOURS
CaroDo Entdneers I Subcønsultants
8
8
2
8
2
2
24
2
4
2
62
8
12
12
2
24
4
12
2
88
~
5
::I:
~
¡¡
.~
Jj
8
12
24
4
12
80
6
24
6
ESIVII ESN I ESIß I ETN
176
~
§¡
~
24
8
2
34
20
i
'"
~
I
"'
~
~
a
~
I
$3,000
113,000
Direct
Costs
!
§ ~
<¡j8
~
$
$
$
$
$
$
$
$
$
$
TOTAL
~
:
u
i
...
841 $
144 $
1,762
2,880
132 $ 3,402
276 $ 5,922
120 $ 3,380
108 $ 17,098
948 $ 18,422
841 $
300 $
84 $
4,456
5,078
1,358
2
2
2
6
$1,000
$1,000
$1,000
$15,400
$2,500
$ 2,280 I $ 63,758
Clot
Hourly Billing Ratel $131 I $131 I $80 I $82 I $53 I
2
2
2
$20,900