7 Resolution Approving a Rental Agreement for Sludge Dewatering Equipment.

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Meeting Date February 16, 2016

STAFF REPORT

AGENDA ITEM: Resolution Approving a Rental Agreement for Sludge Dewatering Equipment

MEETING DATE: February 16, 2016

PREPARED BY: Alfonso Manrique, Alternate City Engineer

REVIEWED BY: Odi Ortiz, Acting City Manager

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RECOMMENDATION:

City Council to adopt Resolution No. 2016-_, approving a rental agreement with Baker Corporation for a skid mounted belt press on a rental basis to provide interim dewatering capacity at the City’s Wastewater Treatment Plant ("WWTP").

BACKGROUND:

The City’s WWTP consists of an extended aeration treatment process. Extended aeration treatment is a biological treatment process and biosolids (sludge) must be periodically purged from the system to maintain a healthy population of organisms in the aeration tank. Biosolids, in the form of waste activated sludge, is purged from the system and conveyed to one of four lined sludge drying beds. At the sludge drying beds, water evaporates and the sludge becomes thicker. Eventually, when the sludge is thick enough, it is transported to a dewatered sludge storage area until it is hauled away.

The City’s WWTP lacks adequate sludge dewatering capacity. The sludge drying beds are insufficient to handle the current production of sludge on a year-round basis. The pace at which the sludge drying beds can dewater sludge is closely related to the weather. During hot summer months, the sludge dries faster than during cold and rainy months.

The City’s WWTP four sludge drying beds are almost full and it is uncertain how long it will take for the sludge to dry so that it can be removed to free up some dewatering space. In order to purge biosolids from the system, the City’s WWTP needs an interim sludge dewatering method to supplement the capacity of the sludge drying beds. It is estimated that the interim sludge dewatering method would be rented for at least two months or until the hot-weather returns and the sludge drying beds can be emptied.

DISCUSSION:

Staff requested quotes from three (3) companies that provide sludge dewatering equipment on a rental basis. The following is a summary of all three quotes:

Company

Mobilization &

Demobilization

Rental (per month)

Total

(for two months)

Baker Corporation (Intereco)

$6,000

$3,000

$12,000

Alfa Laval

$12,000

$24,000

Aspen Rentals

$7,184

$11,000

$29,184

The sludge dewatering equipment on the previous table would provide supplemental sludge dewatering capacity until the sludge drying beds can be emptied.

The cost to purchase a sludge dewatering unit to adequately handle the City’s sludge production ranges between $250,000 and $350,000, depending on the type of equipment. It is recommended that the costs of a new sludge dewatering facility be included in next fiscal year’s budget, however, it may take six to eight months for a sludge dewatering facility to be fully operational. In the meantime, the City can supplement sludge dewatering capacity on a rental basis as needed.

FISCAL IMPACT:

The City had not budgeted for the rental of this equipment but it is considered to be needed due to the limited drying capacity of the sludge drying beds from this winter’s wet weather. The total cost for the rental equipment for a two-month period is $12,000.00. Some small piping supplies and polymer will also be required to install the rental equipment. The cost of the additional supplies and polymer is estimated to be $6,000. Cost will be funded through the Wastewater Treatment Plant operating budget.

ATTACHMENTS:

1. Resolution No. 2016-

2. Rental Equipment Cost Proposals

RESOLUTION NO. 2016-

RESOLUTION OF THE CITY COUNCIL OF THE CITY OF LIVINGSTON APPROVING A RENTAL AGREEMENT WITH BAKER CORPORATION FOR SLUDGE DEWATERING EQUIPMENT, IN AN AMOUNT NOT TO EXCEED TWELVE THOUSAND DOLLARS

WHEREAS, the City of Livingston’s Wastewater Treatment Plant ("WWTP") consists of an extended aeration treatment process. Extended aeration treatment is a biological treatment process and biosolids (sludge) must be periodically purged from the system in order to maintain a healthy population of organisms in the aeration tank; and

WHEREAS, biosolids, in the form of waste activated sludge, is purged from the WWTP system and conveyed to lined sludge drying beds. At the sludge drying beds, water evaporates and the sludge becomes thicker. Eventually, when the sludge is thick enough it is transported to a dewatered sludge storage area until it is hauled away; and

WHEREAS, currently the City’s WWTP lacks sludge dewatering capacity. The sludge drying beds are insufficient to handle the current production of sludge on a year-round basis especially in cold weather; and

WHEREAS, given the recent cold temperatures, the lack of sludge dewatering capacity raises public health and safety concerns given the potential for an overflow; and

WHEREAS, current budget funds are insufficient to cover the purchase of a sludge dewatering unit which ranges in price from $250,000 to $350,000, thus the City sought informal quotes to rent sludge dewatering equipment for a limited basis; and

WHEREAS, the City received three (3) quotes, with Baker Corporation submitting the lowest quote, with a monthly rental rate of $3,000 plus $6,000 for mobilization and demobilization costs; and

WHEREAS, the City seeks to enter into a two-month rental agreement with Baker Corporation for sludge dewatering equipment.

NOW, THEREFORE, BE IT RESOLVED, that the City Council of the City of Livingston hereby approves a rental agreement with Baker Corporation for sludge dewatering equipment for two months, in an amount not to exceed twelve thousand dollars.

Passed and adopted this 16th day of February, 2016, by the following vote: AYES:

NOES:

ABSENT:

ABSTAIN:

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Rodrigo Espinoza, Mayor of the City of Livingston

ATTEST:

I, hereby certify, that the foregoing resolution was regularly introduced, passed and adopted at a regular meeting of the City Council of the City of Livingston this 16th day of February, 2016.

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Betty Cota, Deputy City Clerk of the City of Livingston

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