HomeMy WebLinkAboutStaff Report 3.A 06/06/2005CITY OF PETALUMA, CALIFORNIA 3.A
AGENDA BILL June 6, 2005
Agenda Title: Resolution Awarding The Contract for Phase 2 and 3 Meeting Date: June 6, 2005
Biosolids Removal at the Oxidation Pond Facility. Meeting Time: 3:00 PM
❑ 7:00 PM
Category (check one): ® Consent Calendar ❑ Public Hearing ❑ New Business
❑ Unfinished Business ❑ Presentation
Denartment: Director: Contact Person: Phone Number:
Water Resources & Michael Ban, P.E. Margaret Orr, P.E. 778-4589
Conservation i- ". P. 8' /L, -
Cost of Proposal: $1,911,139 Account Number:
8200-54210
Amount Budgeted: $3,300,000 Name of Fund:
Wastewater Fund
Attachments to Agenda Packet Item:
• Agenda Report
• Resolution
• Location Map (Exhibit A)
• Biosolid Sampling Photo (Figure 1)
• Biosolid Quantity Estimate in the Oxidation Ponds (Table 1)
• Biosolid Height Contours (Figure 2)
Summary Statement: Aerators provide oxygen in the Aerated Lagoon and Oxidation Pond 1 so that
microorganisms can digest the incoming waste not degraded at Hopper Street. These microorganisms have
been growing from the waste in the water since pond operation began in 1976. Hence, for almost 30 years
microorganisms have been building up in the pond system. At this time, the treated wastewater capacity of
the Aerated Lagoon and Oxidation Pond 1 is limited by the presence of 2,695,100 cubic feet (4,900 dry
tons) of biosolids. In some areas the solids are almost to the very top of the pond. The Hopper Street
facility is nearing capacity and added capacity at the ponds is required to help ensure that discharge
requirements can be met from now until the new Ellis Creels Water Recycling Facility comes on-line in late
2008. If the biosolids top the water level then obnoxious odors could result at the pond site.
The City received two (2) bids for the Phase 2 and 3 Biosolids Removal which includes removal of
2,900 dry tons of the biosolids with an option to remove up to 1,450 dry tons more for the same cost per
ton quoted in the bid price received on May 20, 2005. The bids ranged from $1,431,274 to $2,371,166.76
for 2,900 dry tons of biosolids removal. Since the contract bid price for solids removal was favorable for
the City, the recommended project involves removing 3,675 dry tons of biosolids from the Aerated Lagoon
and Pond 1 to restore necessary capacity and alleviate any potential odor crisis at the ponds.
Recommended Citv Council Action/Suggested Motion:
City Management recommends the City Council approve the resolution awarding the construction contract.
Reviewed by Finance Director: Reviewed by City Attornev: Approved by City Manager:
Date: Date: 01 Date:
Todav's Date: Revision # and Date Revised: File Code: S:\water resources &
5/26/05 # conservafion\Wastewater\62 1 0\60-
Biosolids\City CouncilUune 6, 2005\Award
Agenda Bill and CC Report 6-6-05
final.doc
CITY OF PETALUMA, CALIFORNIA
.TUNE 6, 2005
AGENDA REPORT
FOR
RESOLUTION AWARDING THE CONTRACT FOR PHASE 2 AND 3 BIOSOLIDS
REMOVAL AT THE OXIDATION POND FACILITY
EXECUTIVE SUMMARY:
Aerators provide oxygen in the Aerated Lagoon and Oxidation Pond 1 so that microorganisms
can digest the incoming waste not degraded at Hopper Street. These microorganisms have been
growing from the waste in the water since pond operation began in 1976. Hence, for almost 30
years microorganisms have been building up in the pond system. At this time, the treated
wastewater capacity of the Aerated Lagoon and Oxidation Pond 1 is limited by the presence of
2,695,100 cubic feet (4,900 dry tons) of biosolids. In some areas the solids are almost to the very
top of the pond. The Hopper Street facility is nearing capacity and added capacity at the ponds is
required to help ensure that discharge requirements can be met from now until the new Ellis
Creels Water Recycling Facility comes on-line in late 2008. If the biosolids top the water level
then obnoxious odors could result at the pond site.
The City received two (2) bids for the Phase 2 and 3 Biosolids Removal which includes
removal of 2,900 dry tons of the biosolids with an option to remove up to 1,450 dry tons more
for the same cost per ton quoted in the bid price received on May 20, 2005. The bids ranged
from $1,431,274 to $2,371,166.76 for 2,900 dry tons of biosolids removal. Since the contract bid
price for solids removal was favorable for the City, the recommended project involves removing
3,675 dry tons of biosolids from the Aerated Lagoon and Pond 1 to restore necessary capacity
and alleviate any potential odor crisis at the ponds.
City Management recommends the City Council approve the resolution awarding the
construction contract.
2. BACKGROUND:
Treatment of Petaluma's wastewater occurs at two locations: 950 Hopper Street and at the
Oxidation Ponds at 4400 Lakeville Highway. All wastewater is first pumped into the 950 Hopper
Street plant. The plant on Hopper Street provides primary treatment for up to 6 million gallons
per day (mgd) of incoming wastewater and secondary treatment for 4 mgd of wastewater.
Because of diurnal flow changes, influent flows can exceed 6 mgd. When the flow into the plant
exceeds the capacity of the Hopper Street facility, the remaining raw wastewater and primary
treated wastewater is sent to the Oxidation Ponds for secondary treatment and disinfection prior
to reuse or disposal. At the Oxidations Ponds, the wastewater first enters the Aerated Lagoon,
and is then conveyed into Oxidation Pond 1 (Exhibit A Location Map).
Aerators provide oxygen in the Aerated Lagoon and Oxidation Pond 1 so that microorganisms
can digest the incoming waste not degraded at Hopper Street. These microorganisms have been
growing from the waste in the water since pond operation began in 1976. Hence, for almost 30
years microorganisms have been building up in the pond system. The wastewater term for
microorganisms grown to degrade waste in water is biosolids.
Last summer the Department of Water Resources and Conservation characterized the quantity
and quality of the biosolids at the ponds. The results of this work are presented first followed by
the results of bidding the project.
Quantity of Biosolids
A topographic survey was conducted to measure the existing ground elevations within the ponds
and along site access roads. The volume of biosolids in each pond was determined by measuring
the elevation of the top of the biosolids throughout the pond. The biosolids elevation was
measured using an infrared portable biosolids-measuring device that was lowered to the liquid -
solids interface from a boat (Figure 1). The infrared sensor was lowered into the water to detect
the interface between the water and the biosolids. The depth of water above the biosolids was
then measured using the sensor's graduated cable. Simultaneous with the measurement of the
biosolids surface, a surveyor on the shore determined the horizontal location of the boat and the
water surface location. The data was plotted in order to compare the elevation of the bottom of
the pond with the top of the accumulated biosolids.
The survey work determined the total volume and distribution of biosolids in each pond. At this
time, the treatment capacity of the Aerated Lagoon and Oxidation Pond 1 are limited by the
presence of 2,695,100 cubic feet (4,900 dry tons) ofbiosolids(Table 1). Both the Aerated
Lagoon and Oxidation Pond 1 have deep accumulations of biosolids because these two ponds
receive the pond influent flow and are always in use providing aeration and wastewater
treatment. Because of the current solids accumulation, only about half of the total volume of the
Aerated Lagoon is available for wastewater treatment, the rest is filled with biosolids. In
Oxidation Pond 1 which is 2.5 times the size of the Aerated Lagoon, biosolids take up more than
two-thirds of the pond's volume. To restore substantial wastewater treatment capacity to the
Oxidation Pond system, most of the biosolids in the Aerated Lagoon and Oxidation Pond 1
require removal. On Figure 2 the approximate height of accumulated biosolids above the sloping
bottom of the Aerated Lagoon and Pond 1 is indicated by contour lines in feet. The biosolids
have settled in mountainous configurations where several areas approach the height of the pond
with less than a half foot of water cap above the biosolids. The consequences of this situation are
as follows:
1. Potential Odors. If any pond becomes so full of biosolids that it is difficult to
maintain a water cap above the biosolids, offensive odor conditions will likely
occur._ Offensive odors could lead to Bay Area Air Quality Management District
citations and fines. Offensive odors could impact businesses located in the
Oakmead Northbay Business Park and nearby residents.
2. Capacity at Ponds. A parallel concern is that the Hopper Street facility is very
near capacity and with the two ponds that provide oxygen for further treatment
also capacity limited because of the volume of biosolids stored in them, the
ability to meet permit requirements could be compromised. At a time when
meeting permit is difficult due to the capacity issues in both locations (Hopper
Street and the Oxidation Ponds) this situation could lead to further violations of
the wastewater discharge pennit.
Quality of the Biosolids
Wastewater biosolids have significant organic matter and contain macro- and micro- nutrients
essential for plant growth. However, biosolids may also contain contaminants such as heavy
metals, organic compounds, and pathogens (disease causing organisms, e.g. bacteria, viruses, and
parasites). Therefore, Federal, State, and County regulations control the reuse of biosolids as a
soil amendment. Biosolids applied to land must first be shown to be non -hazardous and must
meet risk-based polhrtant limits specified in the U.S. EPA's Biosolids Rule 503 in Title 40 of the
Code of Federal Regulations (503 Rule). In addition, before biosolids can be land applied, the
503 rule identifies wastewater treatment processes and operational standards that must be used to
condition the biosolids in order to control disease -causing pathogens and reduce the attraction of
vectors (e.g. flies and potential disease -carrying organisms). The 503 rule also places general
requirements on land appliers of biosolids that prescribe management practices, monitoring,
record keeping, and reporting.
Representative samples of the pond biosolids were tested for chemical pollutants and biological
parameters as required by the U.S. EPA's Rule 503 (US EPA, 1993), the State's hazardous waste
regulations (Title 22, Division 4.5, Chapter 11, Article 3 of the California Code of Regulations);
and the County of Sonoma's DHS requirements (DHS, 2004). Information from these test
results was used to characterize the biosolids to determine the appropriate reuse and disposal
options. According to the regulations for land application, biosolids must be tested for volatile
and semi -volatile toxic organic substances and be shown to be non -hazardous as defined by State
and County regulations. The biosolids must be classified based on the following biosolids
quality characteristics, which are defined in Rule 503:
• Pollutant (metals) concentration
• Nitrogen concentrations
• Class of pathogen reduction level achieved
• Vector attraction reduction option achieved, if any
In addition to the quality characteristics listed above, biosolids are also tested for other
agronomic and physical parameters such as phosphorus content, pH, and salinity to determine
the quality of the biosolids for use as a soil amendment and to allow the determination of loading
rate onto farm fields.
The options for land applying biosolids decrease in cost, complexity, and regulatory
requirements in proportion to an increase in the quality classification of the biosolids. The good
news is that the oxidation pond biosolids were found to be non -hazardous and to have low
pollutant concentrations for metals that were below the Rule 503 limits for the maximum
average monthly Pollutant Concentrations. Biological testing for indicator organisms (fecal
coliform) indicated that the biosolids would be classified as meeting the Class B Pathogen
Reduction Requirements at the time of reuse or disposal. Prior to removal from the Oxidation
Ponds the biosolids will not be treated for vector attraction. Consequently, to meet the Vector
Attraction Reduction requirement dining land application, there will be restrictions on how the
biosolids are applied. The biosolids will need to be applied in a way that limits the possibilities
for attracting vectors: these include application of biosolids by injection directly into the ground
(liquid application), disking into the ground within six hours of placement on land surface
(dewater solid application), or by being completely covered with soil (surface disposal).
Biosolids Removal Project
As required by Rule 503, State, and County standards, the City has properly quantified and
characterized the biosolids. Using the data generated in the characterization report, the
Department of Water Resources and Conservation prepared the plans and specifications for this
project. Of interest is the high cost for biosolids removal. To balance the needs of the system
(for capacity and odor control) with the cost, the Department bid the project to remove about
2,900 dry tons of the biosolids as a minimum requirement to partially restore the capacity of the
Aerated Lagoon and Oxidation Pond 1. If cost per dry ton of solids removed was good the
Department intended on removing 3,675 dry tons of the biosolids in the Aerated Lagoon and
Oxidation Pond 1.
This work has been coordinated carefully with the new Ellis Creek Water Recycling Facility. As
you may recall, Phase 1 biosolids removal was approved by City Council last fall to remove
approximately 2,500 dry tons of biosolids stored on the Aerated Lagoon and Pond 4 levees.
Phase 2 is part of this project and will consist of the removal of 2,625 dry tons of biosolids from
Oxidation Pond 1 starting this July and finishing by October 31, 2005. Another companion
project will be brought to the City Council for repairs to the dike surrounding Oxidation Pond 1
by November 15, 2005. Following that work the Ellis Creels Water Recycling Facility contractor
will begin electrical upgrades for additional aeration at Oxidation Pond 1. The new aeration will
be installed by May 1, 2006. At that time, the Phase 3 biosolids removal will begin at the
Aerated Lagoon. The Aerated Lagoon will be taken out of service May 1, 2006 and biosolids
removed by August 15, 2006. Once the biosolids are removed the Ellis Creek Water Recycling
Facility contractor will provide shoring for the tie in of the new plant to the influent pipe area of
the Aerated Lagoon. The Ellis Creek contractor is required to finish this work by November 15,
2006. Once the shoring is in place another contractor will repair the dike surrounding the
Aerated Lagoon. Hence, the final Phase 2 and Phase 3 for the biosolids removal project are
necessary in order to have pond levels synchronized with the needs of the Ellis Creek Water
Recycling Facility construction schedule as well as capacity increases necessary until the new
plant comes on-line in late 2008.
The bidders for this project are a select group of companies that have land approved for biosolids
application and are equipped to handle the biosolids as required by Rule 503 (meet requirements
for vector attraction, etc.). Thirty-eight sets of plans were distributed to the exchanges and
interested contractors. Of that group, only 4-5 contractors listed met EPA requirements for
handling biosolids. Two of the top known companies for providing biosolids removal bid the
project. The two bidders are common competitors for work. The Notice Inviting Bids was
issued on April 22, 2005. Bids were received and opened on May 20, 2005. The following is a
summary of the bids received:
NAME OF BIDDER
BID AMOUNT
Synagro West, hic., El Dorado Hills, CA $1,431,274.00
Trimax AN ASW Co., Edmonton, Canada
$2,371,167.76
The engineer's estimate for removal of 2,900 dry tons of biosolids was $1,560,000.
With a bid of $1,431,174, the apparent low bidder is Synagro West, Inc. This bid amount is
below the engineer's estimate for 2,900 dry tons of biosolids removal for $1,560,000. Synagro
performed similar projects for Iron House Sanitation District, City of Stockton, and the City of
Calistoga. When contacted by the Department of Water Resources and Conservation, these
agencies gave good reviews of Synagro's work. Staff verified that Synagro possesses a valid
Class A California Contractor's license, license number 817636, expiration date February 28,
2007, that qualifies Synagro to perform the biosolid removal project.
3. ALTERNATIVES:
1. Award the contract to the low bidder.
2. Reject all bids and re -advertise.
3. Take no action
4. FINANCIAL IMPACTS:
Typical pricing for biosolids removal is about $500 per dry ton. The City received an excellent
bid of $395 per dry ton. Therefore, City Management recommends the City capitalize on this
good price and remove 3,675 dry tons of the biosolids currently occupying more than 50% of the
space in the Aerated Lagoon and more than 60% of the space in Oxidation Pond 1.
The following is the breakdown of the estimated costs:
CONSTRUCTION CONTRACT (LOW BID — 2,900 Dry Tons of biosolids) $1,431,274
REMOVAL OF ADDITIONAL 775 Dry Tons 306,125
PROJECT CONTINGENCY FOR 3,675 Dry Tons 173,740
ESTIMATED TOTAL COST $1.911,139
The estimated total cost of construction is $1,911,139. The construction will be funded by the
Wastewater Funds in the amount of $1,911,139.
5. CONCLUSION:
Following the award, the contractor will enter a contract with the City and submit the required
contract documents, bonds and insurance.
Phase 1 Biosolids Removal from Aerated Lagoon Levee — Fall 2004 — Completed.
Phase 2 Biosolids Removal Oxidation Pond 1 — July 2005 — October 2005.
Phase 3 Biosolid Removal Aerated Lagoon — May 2006 — August 2006
6. OUTCOMES OR PERFORMANCE MEASUREMENTS THAT WILL IDENTIFY SUCCESS OR
COMPLETION:
Successful removal of 3,675 dry tons of biosolids from the Oxidation Pond 1 and the Aerated
Lagoon providing necessary treatment capacity until the new Ellis Creels Water Recycling
Facility is on-line in late 2008. After the new plant is on-line the Oxidation Ponds will provide
treatment during wet weather conditions.
RECOMMENDATION:
City Management recommends the City Council adopt the resolution awarding the contract to
the low bidder, Synagro West, Inc.
1
2
3 AWARDING A CONSTRUCTION CONTRACT FOR THE
4 PHASE 2 AND 3 BIOSOLIDS REMOVAL AT THE OXIDATION POND FACILITY
5
6 WHEREAS, the Phase 2 and 3 Biosolids Removal Project ("Project") is included in the
7 Department of Water Resources and Conservation Fiscal Year 2004-2005 Capital Improvement
8 Program Budget;
9
10 WHEREAS, in accordance with the City of Petaluma Charter and Municipal Code, California
11 Public Contract Code Section 20162 and other applicable law, the City of Petaluma solicited bids
12 for the Project; and
13
14 WHEREAS, two (2) bids for the Project were received on May 20, 2005, and opened in
15 accordance with California Public Contract Code Section 4105.5 and other applicable law; and
16
17 WHEREAS, the apparent low bid for the Project was submitted by Synagro West, Inc.; and
18
19 WHEREAS, the City staff has verified that Synagro West, Inc. possesses a valid California
20 Contractor's license, Class A, license number 817636, expiration date February 28, 2007, that
21 qualifies Synagro to perform the Project; and
22
23 NOW BE IT RESOLVED by the Petaluma City Council that:
24 1. The low bid is accepted.
25 2. The contract is hereby awarded to Synagro West, Inc., 4993 Golden Foothill Parkway,
26 Suite 2, El Dorado Hills, CA 95672, the low bidder.
27 3. This resolution shall become effective immediately.
28 4. All portions of this resolution are severable. Should any individual component of this
29 resolution be adjudged to be invalid and unenforceable by a body of competent
30 jurisdiction, then the remaining resolution portions shall be and continue in full force and
31 effect, except as to those resolution portions that have been adjudge invalid. The City
32 Council of the City of Petaluma hereby declares that it would have adopted this
33 resolution and each section, subsection, clause, sentence, phrase and other portion
8
I thereof, irrespective of the fact that one or more section subsection, clause sentence,
2 phrase or other portion may be held invalid or unconstitutional.
3
4 BE IT FURTHER RESOLVED that the City Manager is hereby authorized to execute the
5 contract with Synagro West, hic. subject to the review and approval of all contract documents,
6 insurance certificates and bonds by the City Attorney.
E
EXHIBIT A
LOCATION MAP
10
11
FIGURE 1
BIOSOLID SAMPLING PHOTOS
I')
Figure 1— City of Petaluma Oxidation Ponds
Wastewater biosolids sampling with 20 ft. sampler in the Aerated Lagoon
Pond 4 watewater biosolids sample preparation for laboratory analyses.
13
C\Oocumems and Servings\ynti pen\Local San ng,\Temponpy Imams, F&,\OLK35\Pham. -0 dos pal,, A -i
Figure 1 — City of Petaluma Oxidation Ponds
Survey measurements of thickness of biosolids in Pond 6 using density meter
14
,na u„.. Imcnun Pdo\OL05\Phnm+_i dnc P,h � :\-3
y4
i
� fv4:! •a:}'r. .�,',.";'
..�J .. iii.:"',:r:;
_
View north of the Aerated Lagoon showing
the survey ground control equipment
used to record position during pond biosolids measurements and sampling.
14
,na u„.. Imcnun Pdo\OL05\Phnm+_i dnc P,h � :\-3
TABLE I
BIOSOLID QUANTITY ESTIMATE IN THE OXIDATION PONDS
15
Table 1:Biosolids Quantities Estimate in the Oxidation Ponds
Pond Full
Average
Pond
Biosolids
Water
Height
Depth(')
Above
Pond
Bottom `
No.
Lagoon
1
3
4
5
6
1 7
8
9
10
Notes:
Est Full
Est.
Est.
Pond
Volume
Total
Operating
Biosolids
Pond
Volume
Total('')
Volume
52
1 F
as
67%
5.5%
Biosolids
Biosolids
Est.
Est. Dry
Average
Volume
Solids
Percent
Biosolids
Above 1
Solids (3)
Above
FT (4)
52
1 F
2,369,300
FT FT
CF CF
Percent Percent
CF
DTS
13.5 7.5
1,436,000 796,500
55%
5.8%
726,800
1,400
7.75
52
3,539,000
2,369,300
67%
5.5%
1,968,300
3,500
7.5
1.3
5,025,000
853,700
17%
5.8%
196,100
400
925
1.5
5,988,000
1,001,7001
17% 3.4%(3) (
376,800
400
925 1 0.8
6,095,000 499,500
8% 5.6%
0
0
10.251 1.0
1 7,079,0001 677,700
10% 1 2.8%(3) 1
60,2001
100
10.25
1.8
7,159,0001 1,242,0001
17%
3.6%(3) 1
635,3001
700
11.75
22
7,722,000
1,422,9001
18%
4.0%(3)
880,900
1,200
10.751 1.0
6,602,000
642,600
10% 2.9%(3)
20,800
0
9.0 0.5
6,075,000 326,700
5% 1.8%
0
0
6.0 0.6
4,081,000 386,100
9% 3.5%
0
0
(') Water depth varies.
Pond bottoms are sloped.
(2) Biosolids thiclmess
varies. Biosohds measurements were talon in Aug. -Sept. 2004
(3) Percent solids based on average value of 4 sample results.
For ponds with no sample data (Ponds
3, 5, 6, 7,
and 8) percent solids
was estimated from a pond study conducted at the City of Stocluon correlating
biosolids depth verses
percent solids (Carollo, 1999)
(4) Biosolids quantities
(dry tons) estimate based on Pond 1 biosolids maximum sample density, 1.043
g/ml (65
LB/CF).
CF = Cubic feet
DTS =Dry tons
g/ml = Grams per milliliter
LB = Pounds
Max. = Maximum recommended operating depth
16
FIGURE 2
BIOSOLID HEIGHT CONTOURS
17
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LEGEND
+
NOTES
a
FLOATING AERATOR
r�__
2
1. BIOSOUDS SAMPLES W801001 TO -004
AND SAMPLES W1311001 TO -004
TRANSFER STRUCTURE
-.-5—
BIOSOLIDS HEIGHT ABOVE BOTTOM OF POND
3
TESTED FOR ORGANIC AND INORGANIC
18
POLLUTANTS AND NUTRIENTS. OTHER
j
5
E
SAMPLES SHOWN TESTED FOR FECAL
COLIFORM.
n 8 T
0
9 10
0...
C, ' LOCATION MAP
LEGEND
+
BIOSOLIDS SAMPLE LOCATION (SEE NOTE 1)
a
FLOATING AERATOR
C7
BRUSH AERATOR
&--
TRANSFER STRUCTURE
-.-5—
BIOSOLIDS HEIGHT ABOVE BOTTOM OF POND
CONTOUR IN FEET
18
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CITY OF PETALUMA OXIDATION PONDS
BIOSOLIDS CHARACTERIZATION REPORT
4400 LAKEVILLE HIGHWAY, PETALUMA, CA 94954
AERATED LAGOON & POND 1 PLAN WITH
BIOSOLIDS HEIGHT CONTOURS
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CITY OF PETALUMA OXIDATION PONDS
BIOSOLIDS CHARACTERIZATION REPORT
4400 LAKEVILLE HIGHWAY, PETALUMA, CA 94954
AERATED LAGOON & POND 1 PLAN WITH
BIOSOLIDS HEIGHT CONTOURS
FIGURE _Z
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mBY,W."xi.BemR.ID.G9840.INaC . ENGIumn