24-13_-_Addendum_No._1.pdf

(Addn. No. 1, Pg. 1)

ADDENDUM NO. 1

PROJECT TITLE: FULL PIPE PENETRATION REPLACEMENT

DEFERRED MAINTENANCE PROGRAM (DMP)

LOCATION: DAVIS – SITES 545 AND 549

SPECIFICATION NO.: 24-13

CONTRACT NO.: C51674

ISSUED BY: STATE OF CALIFORNIA

DEPARTMENT OF WATER RESOURCES

DATE ISSUED: JANUARY 28, 2025

The following changes are hereby made by this addendum:

1. Revised section(s) with page numbers: 03300-{4, 6, 6a, 13, 14, 16}

BIDDER'S SIGNATURE

This addendum shall be signed below in the same manner as the bid is signed.

Bidder: ________________________________________________________

By (Authorized Officer): ___________________________________________

Business Address: _______________________________________________

Dated: ________________________, 20__.

THIS ADDENDUM COMPRISES 7 PAGES.

THIS COVER PAGE MUST BE SIGNED AND RETURNED WITH THE BID.

Cast-in-Place Concrete

03300-4 G-24 (Addn. No. 1, Pg. 2)

y. ****

z. ASTM C 1602 – Standard Specification for Mixing Water Used in the Production of Hydraulic Cement Concrete

aa. ASTM D 75 – Standard Practice for Sampling Aggregates

bb. ASTM D 1751 – Standard Specification for Preformed Expansion Joint Filler for Concrete Paving and Structural Construction (Nonextruding and Resilient Bituminous Types)

cc. ASTM D 1752 – Standard Specification for Preformed Sponge Rubber, Cork and Recycled PVC Expansion Joint Fillers for Concrete Paving and Structural Construction

dd. ASTM D 2419 – Standard Test Method for Sand Equivalent Value of Soils and Fine Aggregate

3. California Department of Transportation (Caltrans):

a. California Test 227, Method of Test for Evaluating Cleanness of Coarse Aggregate

4. Department of Interior, Bureau of Reclamation:

a. Specification M-47 (MO470000.296), Standard Specification for Repair of Concrete

5. International Concrete Repair Institute (ICRI):

a. Guideline No. 310.2R – Selecting and Specifying Concrete Surface Preparation for Sealers, Coatings, Polymer Overlays, and Concrete Repair

6. National Ready Mixed Concrete Association (NRMCA):

a. Quality Control Manual – Section 3, Certification of Ready Mixed Concrete Production Facilities

1.04 SUBMITTALS

A. Concrete Mix Design Data:

1. Concrete Mix Design(s):

03300-6 G-24 (Addn. No. 1, Pg. 3)

B. Concrete Certifications:

1. NRMCA Certification of Production Facilities:

a. Concrete supplier’s ready-mix plant information, including plant certification in accordance with NRMCA or equivalent.

b. Concrete supplier’s delivery fleet inspection records in accordance with NRMCA or equivalent.

c. Current calibration of scales, water meters, and admixture dispensers.

d. Example batch ticket per requirements specified herein.

2. Quality Control Testing Agency Qualifications:

a. Quality control testing laboratory AASHTO certification.

b. QC testing personnel certifications:

1) ACI Aggregate Testing Technician – Level 1 certification(s).

2) ACI Concrete Field Testing Technician – Grade I certification(s).

3) ACI Concrete Strength Testing Technician certification(s).

c. QC testing personnels’ supervisor qualification:

1) Registration as a civil engineer.

3. Contractor’s Personnel Qualifications:

a. ACI Concrete Flatwork Finisher certification(s).

C. Concrete Placement Drawings:

1. Drawings for individual concrete placements showing concrete work placed in one continuous operation between specified lines or joints.

a. The scale used shall not be less than 1/4-inch to 1 foot and shall be sufficient to adequately show all details of the construction.

03300-6a G-24 (Addn. No. 1, Pg. 4)

b. List contract drawing(s) from which details for placement were obtained.

c. Show locations, elevations, dimensions, blockouts, openings, recesses, waterstops, construction joints, other embedded items, and finishes.

d. Placement drawings shall be coordinated and referenced with related reinforcement and formwork drawing(s) associated with each placement.

2. Include separate drawing(s) showing sequence of placements.

03300-13 G-24 (Addn. No. 1, Pg. 5)

ASTM C 29. The quantity of size Number 4 shall not be less than 40 percent of the total coarse aggregate, by weight.

B. Concrete Temperature at Point of Placement:

1. The temperature of concrete at point of placement shall not exceed 85 degrees Fahrenheit when measured per ASTM C 1064.

2. Aggregates and water shall be heated or cooled to produce concrete within specified limits. If ice is used to cool concrete, the ice particles shall be sized to be completely melted prior to discharge from the mixer.

C. Plastic Concrete Consistency Control:

1. Concrete slump will be determined in accordance with ASTM C 143. The slump of concrete at the point of placement shall conform to the limits specified in Table 03300 B – Concrete Slump Working Limit, measured in inches:

Table 03300 B – Concrete Slump Working Limit

Item Working Limit Inadvertency

Margin Rejection

Limit Structural Concrete 5 1-1/2 6-1/2 Transition Concrete 5 1-1/2 6-1/2

a. The “Working Limit” is the maximum slump for estimating the quantity of water to be used in the concrete.

b. The average slump shall be less than the “Working Limit” per individual concrete placement.

c. The “Inadvertency Margin” is the allowable deviation from the “Working Limit” for such occasional batches of concrete as may inadvertently exceed the “Working Limit”.

d. Batches of concrete with slumps exceeding the “Rejection Limit” will be rejected.

e. Batches of concrete with slumps in the inadvertency margin may be rejected by the Engineer if the Contractor fails to promptly reduce the slump of concrete to within the working limit.

03300-14 G-24 (Addn. No. 1, Pg. 6)

f. Concrete that has been rejected for failure to meet slump limits shall not be salvaged for use in the work and shall be removed from the work site as the Contractor’s property.

2. Water may be added one time upon arrival of the truck in accordance with ASTM C 94, after approval by the Engineer, at the placement site to adjust the slump to within specification limits but not after discharge begins. Added water shall not exceed the submitted and approved concrete mixture proportions. Addition of water shall be in the presence of the Engineer.

3. Concrete produced for demonstration or test purposes shall not be used in the work.

D. Contractor Batch Plant Quality Control Testing

1. Independent testing agency shall perform sampling, testing, and reporting as required in Table 03300 C – Batch Plant Testing.

a. Independent testing agency shall meet requirements specified in ASTM C 1077.

b. Personnel conducting tests: Qualified as ACI Aggregate Testing Technician, Level I; or equal.

2. Perform tests at least as often as frequencies specified in Table 03300 C – Batch Plant Testing.

3. Aggregates shall be sampled in accordance with ASTM D 75.

4. Notify the Engineer immediately of test results showing failure of materials to meet specifications. Submit reports of test results within 48 hours of testing. Results of all field testing shall be provided to the Engineer on site on the same day.

03300-16 G-24 (Addn. No. 1, Pg. 7)

2. Concrete wet curing blankets shall be UltraCure DOT, manufactured by Sika Corp; or equal.

C. Curing Compounds:

1. Concrete curing membrane shall be white pigmented, conforming to ASTM C 309, Type 2, Class B.

2. Shall meet Federal, State, and Local regulations for volatile organic compounds (VOCs).

D. ****

2.08 ****

PART 3 EXECUTION

3.01 PREPARATION FOR PLACING

A. Do not place concrete until formwork, embedded parts, steel reinforcement, foundation surfaces, and joints involved in placement have been approved, and until appropriate facilities have been provided and made ready for accomplishing the work as specified.

B. Items to be embedded shall be free of oil and other foreign matter such as loose coatings, rust, paint, and scale.

C. Aluminum shall not be embedded in concrete unless coated with 20 mils of cold-applied coal tar paint.

D. Remove standing water, mud, and debris from foundation surfaces immediately prior to covering with concrete.

E. Prepare earth foundations free from frost or ice.

F. Thoroughly moisten surfaces of absorptive foundations to be covered with concrete so that moisture will not be drawn from fresh concrete.

Keep subgrade in uniformly moist condition.

G. Clean, roughen, and surface dry surfaces of existing concrete and construction joints to be covered with fresh concrete.