10 Approve a Purchase of Sand Filtration Equipment for Wells No. 9 and 11B
Meeting Date: JANUARY 20, 2015
Agenda Item #10. Approve a Purchase of Sand Filtration Equipment for Wells No. 9 and 11B
Note from TheGardeningSnail: Parts of this page may have been prepared by running a PDF Image Document through a program which converts image to text. My apologies for any Textual Gremlins that may have slipped in. Copy of the Original can be found on the City’s Website. I may also have broken up some of the longer paragraphs for ease of reading.
I have also added a map so you can see which wells are being discussed.
AGENDA ITEM: Approve a Purchase of Sand Filtration Equipment for Wells No. 9 and 11B
MEETING DATE: January 20, 2015
PREPARED BY: Alfonso Manrique, Alternate City Engineer REVIEWED BY: Jose Antonio Ramirez, City Manager
City Council to approve a contract with Amiad Water System for the supply of three self-cleaning filters to remove sand from Well #9 and Well #11B.
Well No. 9 was constructed in 1985 and is the City’s lead well. Well No. 9 is equipped with a 150-hp electric motor and a water-lubricated DWT pump capable of producing 1,300 gpm.
Well No. 9 began producing sand in December 2013 and had to be taken out of service. A centrifugal sand separator was installed in March 2014 at Well #9 to remove the sand before it entered the distribution system.
During September 2014 operators observed that some of the finer sand particles were passing through the sand separator and entering the distribution system. These fine particles were interfering with Foster Farms operations.
Well No. 11B was constructed in 1990 and is located between the railroad and Foster Farms facility. Water produced by Well No. 11B is primarily used by Foster Farms. Well No. 1lB is equipped with a 100-hp electric motor and a water-lubricated DWT pump capable of producing 800 gpm.
During September 2014, just about the same time when sand was observed on Well No. 9, Well No. 11B also began producing sand in significant quantities.
After a few unsuccessful attempts to eliminate the sand from Wells No. 9 and 11B by pumping to waste, staff decided to stop using the wells.
Wells No. 9 and No. 11B have been out of service since October 2014 and cannot be placed in service due to the significant quantities of sand they produce.
Water samples and sand samples were collected from both wells in November 2014 to determine the amount of sand being produced and the particle size distribution of the sand being produced. Sample results indicate that Well No. 9 produces about 64 mg/1 of total suspended solids and Well No. 1lB produces 140 mg/1 of total suspended solids. A hydrometer analysis was also prepared to determine the particle size distribution.
It appears that approximately 25 percent of the particles pass through an 80 micron sieve. Copies of the laboratory reports and the hydrometer analysis are enclosed to this Staff Report.
Based on the test results staff has concluded and recommends that filtration equipment be installed at Wells No. 9 and 11B to remove the sand before it enters the distribution system. Staff requested quotes from four (4) reputable filtration equipment companies to furnish filters that would remove the suspended solids from Wells No. 9 and 11B.
Based on the hydrometer report, a sieve opening of 80 microns was determined to be adequate to remove most of the suspended particles.
Tables 1 and 2 provide a comparison of the quotes received to provide filters for Wells No. 9 and No. 1lB respectively.
After reviewing the equipment proposed by the four manufacturers we recommend Amiad for the following reasons:
1. Amiad filters are NSF 61 approved.
2. Amiad filters provide the lowest pressure drop.
3. Amiad has a heavier-duty, more robust vessel and screen element.
4. The Amiad backwashing mechanism is mechanically driven and does not rely on water pressure to move the suction pipe and nozzles.
The proposed equipment consists of one (1) EBS 15000 at Well No. 9 and two (2) EBS 10000 in parallel at Well No. 1lB.
The total equipment costs at Well No. 9 is $38,227.60.
The total equipment cost at Well No. 11B is $58,884.80. Equipment costs do not include installation.
Staff believes that the sand problem is a consequence of stress in the aquifer caused by the drought. Staff is working with the Department of Water Resources (DWR) to secure drought emergency funding to pay for the filtration equipment. However, DWR is still reviewing the City’s request and grant funding has not yet been awarded.
The City had not budgeted for the purchase of this equipment and it is considered to be an emergency caused by the drought situation.
The total cost for the equipment is approximately $97,112.40 plus shipping and taxes. Staff will continue working with DWR to try to secure grant funding for this project. However,
Well No. 9 and 11B are critical to meet demands and need to be in operation before the hot weather arrives and water demands increase.
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF LIVINGSTON APPROVING THE PURCHASE OF SAND FILTRATION EQUIPMENT FOR WELLS NO. 9
AND NO. 11B FROM AMIAD WATER SYSTEMS, AND AUTHORIZING THE CITY MANAGER TO ORDER THE EQUIPMENT FROM THE SELECTED SUPPLIER
WHEREAS, the City of Livingston is in need of installing sand filtration equipment on Wells No. 9, and No. 11B; and
WHEREAS, the City has a target of Spring of 2015 to have both wells in service; and
WHEREAS, unless the City orders the sand filtration equipment ahead of a contractor’s contract for the equipment and installation, the current completion target for the work will not be met; and
WHEREAS, the City desires to purchase the sand filtration equipment from AMIAD Water Systems for the quoted price of $38,227.60 for Well No. 9 and $58,884.80 for Well No. 1lB, for a total estimated cost of $97, 112.40; and
WHEREAS, the City Council of the City of Livingston hereby finds as follows:
A. Procurement of sand filtration equipment has been performed m accordance with DWR requirements; and
B. There is an urgent need to purchase the equipment in order to have the wells in service as scheduled.
NOW, THEREFORE, BE IT RESOLVED by the City Council of the City of Livingston as follows: Section 1. The above recitals are true and correct findings of the Livingston City Council.
Section 3. The City Manager is hereby authorized and directed to purchase the sand filtration equipment from AMIAD Water Systems for the quoted price of $97,112.40.
Section 4. This Resolution shall take effect from and after the date of its adoption.
Section 5. Each portion of this resolution is severable. Should any portion of this resolution be adjudged to be invalid and unenforceable by a body of competent jurisdiction, then the remaining resolution portions shall be and continue in full force and effect, except as to those resolution portions that have been adjudged invalid. The City Council of the City of Livingston hereby declares that it would have adopted this resolution and each section, subsection, clause, sentence, phrase and other portion thereof, irrespective of the fact that one or more section, subsection, clause sentence, phrase or other portion may be held invalid or unconstitutional.
Passed and adopted this 20th day of January, 2015, by the following vote:
Rodrigo Espinoza, Mayor of the City of Livingston
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 20th day of January, 2015.
Antonio Silva, City Clerk of the City of Livingston