Contract_No._41020_-_VSWTP_Filter_#7_Sand_Replacement_SPEC_FINAL.pdf

COUNTY OF SACRAMENTO

PUBLIC WORKS & INFRASTRUCTURE

DEPARTMENT OF WATER RESOURCES

Sacramento County Water Agency

CONTRACT NO. 41020

VINEYARD SURFACE WATER TREATMENT

PLANT (VSWTP) FILTER REPAIR PROJECT

September 2026

BID DOCUMENTS

NOTE: The County of Sacramento Standard Construction Specifications dated September 2001, and last revised November 2024, are hereby made a part of these Specifications. A copy of the Standard Construction Specifications may be downloaded from the County website at saccountyspecs.saccounty.gov

Data on this project, including the plan holders list and bid results, can be viewed at:

http://www.saccountybids.com

DAVID DEFANTI, DEPUTY COUNTY EXECUTIVE

COMMUNITY SERVICES

MATT SATOW, DIRECTOR

http://www.saccountyspecs.net/ http://www.saccountybids.com/

COUNTY OF SACRAMENTO

COMMUNITY SERVICES

Sacramento County Water Agency

VINEYARD SURFACE WATER TREATMENT PLANT FILTER

REPAIR PROJECT

SACRAMENTO COUNTY CONTRACT NO. 41020

THE SPECIAL PROVISIONS CONTAINED HEREIN HAVE BEEN PREPARED BY OR UNDER

THE DIRECTION OF THE FOLLOWING REGISTERED PERSONS.

TO BE SUPPLEMENTED WITH THE COUNTY OF SACRAMENTO STANDARD

CONSTRUCTION SPECIFICATIONS DATED SEPTEMBER 2001 (REVISED

NOVEMBER 2024).

Project Engineer

Mitra Im Date Senior Civil Engineer Water Supply Department of Water Resources

9/8/2026

VSWTP Filter Repair Project SPECIAL PROVISIONS 01 11 00-1

VINEYARD SURFACE WATER TREATMENT PLANT FILTER SAND

REPLACEMENT PROJECT

SPECIAL PROVISIONS

CONTRACT No. 41020

DEPARTMENT OF WATER RESOURCES

Sacramento County Water Agency

SP-01 GENERAL REQUIREMENTS

SP-02 DESCRIPTION OF WORK

SP-03 MODIFICATIONS TO NOVEMBER 2024, REF. “SCS”, AS AMENDED, COUNTY OF SACRAMENTO

STANDARD CONSTRUCTION SPECIFICATIONS

SECTION 1-3 DEFINITIONS

SECTION 7-15 TIME OF COMPLETION

SECTION 8-10 LIQUIDATED DAMAGES

SECTION 10-9 SANITARY REGULATIONS

PROTECTION OF IMPROVEMENTS

SP-04 OTHER WORK

01 11 00-2

SP-01 GENERAL REQUIREMENTS

A. Standard Construction Specifications (SCS) adopted September 2001, and last revised

November 2024 are hereby made part of these specifications. Modifications to the Standard Construction Specifications are noted below.

B. Copies of the Standard Construction Specifications may be obtained online to be downloaded for no cost at: saccountyspecs.saccounty.gov

SP-02 DESCRIPTION OF WORK

General Description The work to be performed under this contract includes the furnishing of all labor, materials, and equipment for the procurement of sand, removal and disposal of spent silica sand media contained in one filter (#7); installing new sand within the same filter and repairing said filter owned by the Sacramento County Water Agency. There are 8 filters at the Vineyard Surface Water Treatment Plant (VSWTP). Each filter contains approximately 4096 ft3 of the anthracite filter media and approximately 1024 ft3 of sand within two cells. Only one filter, filter #7, is included in the scope of work. The treatment facility is in Sacramento, California.

The work includes, but is not limited to procurement of new sand, removal of existing anthracite filter media, removal of existing sand within the filter, inspection and repair of the joint between the walls and floor of the filter, installation of new approved sand within the filter cell, reinstallation of the anthracite, sampling and performing of waste extraction tests on the spent media to determine whether it is non-hazardous, and compliance with all health, safety, and other applicable federal, state or local regulations/laws whose jurisdiction the facilities are located within.

There will be no SWPPP plans or WPCP or other permits required for this project. The contractor shall take necessary measures to minimize the erosion and migration of sediments into the storm drain system and adhere to Section 10 of the Standard Construction Specifications, Environmental Controls at Work Site Section, SCS 10.

Contractor shall maintain confined space certifications and adhere to OSHA and site-specific regulations prior to physically entering the filter basin.

See the Plans for the Location Map, Site Layout, and Filter drawings.

See below the specifications of bid items and materials:

Bid Item 1: Mobilization and Demobilization.

A. By the Unit price of Lump sum. Mobilization shall be pursuant to Section 8-1.03 of the Standard Construction Specifications.

Bid Item 2: Removal of existing Anthracite filter media within Filter #7.

A. By the Unit price of Lump sum. Contractor shall transfer approximately 2048 ft3 of existing anthracite filter media from Filter #7 for temporary storage. Existing anthracite shall be http://www.saccountyspecs.net/

01 11 00-3 preserved properly with no damage to the media. Any media that is damaged shall be the responsibility of the contractor.

Bid Item 3: Sand Removal from Filter #7 south cell.

A. By the Unit Price of Lump sum. The remaining spent sand shall be removed and dumped on site. Contractor to coordinate with Agency operators on location to dump existing sand.

Bid Item 4: Filter #7 south cell internal repairs.

A. By the Unit Price of Lump sum. Contractor shall inspect and repair the joint between the walls and floor once the basin is empty.

B. On the north wall of the south cell, the cant strip is damaged and the grout along the wall is loose. Most damage is in the middle and on the west side of the south cell. There are likely to be cracks between the floor and wall. Contractor to coordinate with the Agency to identify the specific areas needed for repair prior to repair.

Bid Item 5: Procurement of new sand media and installation of sand in Filter #7 south cell.

A. By the Unit Price of Cubic Feet. Contractor shall provide bid per cubic foot for the procurement of new filter media sand and installation. See “Silica Sand Media” specification for sand media requirements. Contractor to submit “Installation Test Plan” according to Section 1.2 (H) in the Silica Sand Media specification prior to installation of media. Crane installation will not be allowed.

Bid Item 6: Filter #7 Restoration

A. By the Unit Price of Lump Sum. Contractor shall re-transfer the anthracite from storage back into filter #7 to restore full filtration capacity.

SP-03 MODIFICATIONS TO NOVEMBER 2024, REF. “SCS”,

AS AMENDED, COUNTY OF SACRAMENTO STANDARD

CONSTRUCTION SPECIFICATIONS

Modifications shall be made as follows:

SECTION 1-3 DEFINITIONS

A broader list of definitions is available in Section 1 of the General Provisions of the Sacramento County Standard Construction Specifications as amended November 2024.

The definitions below are specific to this project and these Special Provisions.

A. Agency: Shall mean the Sacramento County Water Agency, 827 7th Street, Room 301, Sacramento, CA 95814, (916) 874-6851, Fax: (916) 874- 8693. Also referred to as the Operator.

B. Project Engineer: Mitra Im, Desk: (916) 874-5039, Main office: phone and address as defined above for Agency.

C. SCS: Sacramento County Standard Construction Specifications November 2024. The SCS are incorporated into these contract documents.

01 11 00-4

SECTION 7-15 TIME OF COMPLETION

As set forth in Section 7-15, “Time of Completion”, of the Standard Construction Specifications, the Contract Time for completion of this project shall be FORTY (40)

WORKING DAYS.

SECTION 8-10 LIQUIDATED DAMAGES

As set forth in Section 8-10, “Liquidated Damages for Delay”, of the Standard Construction Specifications, the liquidated damages for this contract shall be five hundred dollars ($500) per calendar day.

SECTION 10-9 SANITARY REGULATIONS

The following is added to Section 10-9

CONTRACTOR shall be solely and completely responsible for implementing the applicable COVID- 19 guidelines from the California Department of Industrial Relations, Division of Occupational Safety and Health, and the applicable COVID-19 guidance from the Centers for Disease Control and Prevention for the protection of workers, including regulations concerning education, training, routine cleaning, on-site washing facilities, and the use of Personal Protective Equipment (PPE) at the workplace (collectively, "Guidelines"). The CONTRACTOR shall submit a plan and/or narrative description to the Agency for compliance with these Guidelines prior to commencement of the Work. This safety plan and/or narrative description shall describe all education, training, routine cleaning, on-site washing facilities, Personal Protective Equipment (PPE), or similar, to be used at the Project Site. Full compensation for implementing the Guidelines, and any required updates to the safety plan and/or narrative description, shall be considered as included in the prices paid for the various items of Work involved as specified in Section 8-3, "Work to be Done Without Direct Payment," of the Standard Construction Specifications and therefore no additional compensation shall be made.

PROTECTION OF IMPROVEMENTS

The following statement shall be added to Section 12-6, “Excavation and Trench Safety” and Section 13-1.02, “Overloading, Pavement Protection & Repair”, of the Standard Construction Specifications.

“The Contractor shall prevent damage to existing surface or subsurface improvements, both public and private. All roadways and other improved surfaces shall be protected from damage by vehicles with tracks or lugs. All costs for this work shall be included in the prices bid for the items involved.”

All facilities, utilities, and property shall be protected from damage resulting from the Contractor’s operations. The Contractor throughout the construction period shall protect all trees, shrubbery, walls, and other improvements, including existing pavements, sidewalks, street improvements, underground utilities, and other improvements not shown on the drawings from damage. All roadways and other improved surfaces shall be

01 11 00-5 protected from damage by vehicles with tracks or lugs.

Any damage resulting from the Contractor’s operations shall be repaired by the Contractor to the condition, which existed prior to the damage, and to the satisfaction of the Engineer, at no cost to the County. The Engineer may deduct from payments otherwise due to the Contractor, the estimated cost of repairing the damage created by the Contractor’s operation, until such time the Contractor makes the repairs to the Engineer’s satisfaction.

SP-04 OTHER WORK

All work not mentioned in these Special Provisions and/or not shown on the plans but considered necessary and in the scope of the Standard of Practice for the given item of construction technique shall be constructed in accordance with the Standard Construction Specifications, or as directed by the Engineer. Payment for work for which there is not an item on the bid form shall be included in prices bid for other items of work necessary to provide a completed job. No additional compensation shall be made.

– END OF SECTION –

VSWTP Filter Repair Project SILICA SAND MEDIA

SILICA SAND MEDIA

PART 1 -- GENERAL

1.1 THE REQUIREMENT

A. The CONTRACTOR shall provide silica sand filter media, complete and in place, in accordance with the Contract Documents.

1.2 CONTRACTOR SUBMITTALS

A. General: Submittals shall be in accordance with Sacramento County Specifications Section 5-8.

B. Certifications: The CONTRACTOR shall certify on the shop drawings that the silica sand is in conformance with ANSI/NSF Standard 61 – Drinking Water System Components and ANSI/AWWA B100 – Granular Filter Material, except as otherwise noted herein.

C. Quality Assurance: The manufacturer shall procure the services of an independent testing laboratory to test the silica sand prior to submittal of samples. The qualifications of the laboratory to perform the analyses required in ANSI/AWWA B100-25 – Granular Filter Material, as certified by an appropriate agency such as the American Association for Laboratory Accreditation, shall be submitted and approved prior to any testing.

D. Samples: The CONTRACTOR shall furnish to the ENGINEER samples of silica sand which is proposed for use. Samples shall be placed in tight jars holding not less than 1 quart (1 liter, approx.) and shall be properly labeled. In addition, laboratory analyses for uniformity coefficient, acid solubility, specific gravity, effective particle size, and gradation shall be submitted.

E. The ENGINEER’s approval of the submitted silica sand media samples shall not be construed as signifying that the materials supplied satisfy all requirements of these Specifications and shall in no way relieve the CONTRACTOR of the obligation to satisfy all requirements specified herein.

F. After the silica sand arrives on site, a testing laboratory retained by the CONTRACTOR will analyze samples in accordance with ANSI/AWWA B100 – Granular Filter Material. The manufacturer shall verify that all bags are properly labeled and shall clearly indicate the customer and lot and bag number on the bags. The bags shall be divided into lots by the CONTRACTOR for testing, with the size of a lot no larger than 1 truckload. The ENGINEER will select 3 bags at random, and the CONTRACTOR shall collect samples from the selected bags per AWWA B100 Sections 5.2. After testing, the testing laboratory will submit the analyses directly to the ENGINEER. The analyses will include effective size, uniformity coefficient, acid solubility, specific gravity, and gradation. In addition, sieve analysis results will be provided in tabular form and plotted on semi-log or log-probability paper. If acceptable to the ENGINEER, the ENGINEER will then instruct the CONTRACTOR to install the silica sand. Contractor shall schedule silica sand deliveries to allow ample time for sampling and testing of the silica sand.

G. The OWNER reserves the right to re-test the silica sand upon delivery or placement. All testing after the silica sand is on-site will be at the CONTRACTOR’s expense. Failure to meet the specification after the silica sand is placed shall be cause for rejection.

H. Installation Test Plan: The CONTRACTOR shall submit a detailed step by step plan with checklists for testing each underdrain system prior to installation of media.

PART 2 -- PRODUCTS

2.1 SILICA SAND MEDIA

A. Silica sand and silica sand testing methods shall conform to the requirements of ANSI/AWWA B100, except as otherwise indicated.

B. Uniformity: The silica sand provided in the WORK shall be equal in all respects to the approved samples, and similar samples for test purposes shall be furnished if required by the Engineer during the preparation and placing of the silica sand.

C. Material Quality: The silica sand shall consist of hard, durable, dense grains that will resist degradation during handling and use and shall contain not more than two (2) percent minus No. 200 material by washing, as determined by ASTM C117 and a color not darker than the standard color in ASTM C40/C40M for impurities in fine aggregate, and shall comply with Section 4 of ANSI/AWWA B100.

D. Acid Solubility and Hardness: The silica sand solubility in a 1:1 mixture of concentrated hydrochloric acid (approximately 37 percent) shall be less than five (5) percent. It shall have a hardness of not less than 2.7 on the MOH scale. All test procedures shall be in accordance with the applicable portion of Section 5 of ANSI/AWWA B100 – Granular Filter Material.

E. Particle Size and Gradation: Silica Sand shall have the uniformity coefficient and size indicated below. Effective size is defined as the theoretical size of the sieve (in millimeters) that will pass 10 percent of the sample by weight. The uniformity coefficient is defined as the theoretical size of the sieve (in millimeters) that will pass 60 percent of the sample by weight divided by the effective size. The particle size of the silica sand shall be determined by screening through standard sieves calibrated in accordance with ASTM E11 – Standard Specification for Woven Wire Test Sieve Cloth and Test Sieves.

F. Silica Sand Suppliers, or Equal

1. CEI Filtration, Inc., Circleville, Ohio

2. Northern Filter Media (Northern Gravel Company), Muscatine, Iowa

3. Unifilt Corporation, Fombell, Pennsylvania

4. Carbon Activated Corp., Compton, California

2.2 FILTER DESIGN

A. Silica sand shall be provided for 1 filter of which have a surface area of 1,024 square feet.

The depth of silica sand shall be as measured after all necessary washing and scraping has been completed. The depth shall be measured from the top surface of the underdrains.

B. The silica sand layer of the filter bed shall meet the following criteria:

1. Depth (inches) 12 (after all washing and skimming procedures)

2. Effective size (mm) 0.55 ± 0.05

3. Uniformity coefficient less than 1.5

4. Specific gravity greater than or equal to 2.64

PART 3 -- EXECUTION

3.1 GENERAL

A. Silica sand delivery, placing, and filter preparation methods shall conform to the requirements of ANSI/AWWA B100 – Granular Filter Material, except as noted herein.

B. Delivery of Materials: Manufactured materials shall be delivered in original, unbroken packages, containers, or bundles.

C. Jobsite Storage: All packages, containers, or bundles of silica sand shall be stored on wooden pallets set on a pad of gravel elevated 6 inches above adjacent grade. Tarps, opaque visqueen, or other protective cover shall be utilized to minimize UV degradation of the containing bags and to prevent intrusion of water, dust, and other airborne pollutants.

3.2 PLACEMENT, WASHING, AND TESTING

A. Placing: Special care shall be taken in transporting and placing the silica sand to avoid contamination with dirt or organic matter. Any silica sand which has become dirty, either before or after it has been placed in the filters, shall be either washed or removed and replaced by clean silica sand. All silica sand which has been contaminated by organic matter will be rejected. In placing the silica sand in the filters, extreme care shall be taken to avoid disturbing the underdrains, pipes, or other appurtenances within the filter cell.

Method of placement shall not break down the silica sand material.

B. Washing and Testing: The silica sand shall be placed in one 12-inch lift. After the 12-inch lift of silica sand has been placed, it shall be washed at least 3 times, with the ENGINEER present, by the washing devices connected with the filters. The wash water shall be applied at the start at a rate not to exceed 2 gallons per minute per square foot of filter area and shall be gradually increased to a maximum of 21 gpm/sq ft. Each separate and distinct washing shall be of at least 5 minutes duration at the indicated maximum wash rate.

C. Cleaning: The fine-grained materials which accumulate at the surface of the bed shall be scraped off and removed by the CONTRACTOR at the end of each period of backwash.

The depth of scraping shall be approximately 5 percent, 2.5 percent, and 1.5 percent of the indicated 12-inch silica sand depth for successive washes.

D. The filter shall be washed and tested one at a time. Water for the initial backwash and testing shall be routed by the CONTRACTOR from the completed clearwell and high service pump station. The water itself will be provided by the OWNER.

- END OF SECTION -

SP-04 OTHER WORK