22-09_Information_Letter_No._6.pdf

STATE OF CALIFORNIA – CALIFORNIA NATURAL RESOURCES AGENCY GAVIN NEWSOM, Governor

DEPARTMENT OF WATER RESOURCES

P.O. BOX 942836

SACRAMENTO, CA 94236-0001

TO ALL HOLDERS OF

BIDDING DOCUMENTS ON

EMERGENCY RELEASE FACILITY

LAKE PERRIS

STATE WATER FACILITIES

CALIFORNIA AQUEDUCT

EAST BRANCH

SANTA ANA DIVISION

RIVERSIDE COUNTY

CALIFORNIA

SPECIFICATION NO. 22-09

CONTRACT NO. C51632

INFORMATION LETTER NO. 6

The following questions have been received for clarification. The Department of Water

Resources’ (DWR) answers are given immediately following the questions.

Question No. 1: Specification section 03300-1.01.3.c lists wing walls under

Structural Concrete – General, does this include the wing walls for the bridge abutments? Or will the bridge wingwall abutments be paid under Structural Concrete – Bridge?

Answer: Please refer to Addendum No. 2, Section 03300, Paragraph 1.01.B.

Question No. 2: Specification Section 02645 “Bridge Drainage System” states that it

“includes geocomposite drain, filter fabric, treated permeable base and PVC at wing walls, retaining walls, and approach slabs at

Fairway Culvert, Lake Perris Drive Bridge, and Evans Road Bridge.

Please clarify what is paid under Bid Item 110 BRIDGE DRAINAGE

SYSTEM and what is paid under Bid Item 114 GEOCOMPOSITE

DRAIN.

Answer: Please refer to Addendum No. 2, Sections 02645 – Bridge

Drainage System, 02650 – Geosynthetic Materials, and 02750 –

Approach Slab. Bid Item No. 114 is deleted.

Docusign Envelope ID: B32F7534-B142-4550-8203-84DF9CD0D63A

8/19/2024

Specification No. 22-09

Information Letter No. 6

Question No. 3: Is Bid Item 154 TEMPORARY SUPPORTS intended to be for the temporary wingwall shown in the abutment drawings of Evans

Road Bridge? If not, will this be paid under bid item 153

FALSEWORK?

Answer: Bid Item No.154 is for the Evans Road Bridge deck closure pour as shown on drawing no. S-501. The temporary wingwall at Evans

Road Bridge is paid under Bid Item No. 159, Structural Concrete -

Bridge. See also response to Question No. 1.

Question No. 4: Are the temporary wingwalls on Evans Road Bridge supposed to be removed in stage 2 construction or buried in place?

Answer: Temporary wingwalls at Evans Road Bridge abutments will be left in place. Please refer to Addendum No. 2, Section 03300, Paragraph 1.01B.2.

Question No. 5: Are the parapets on the Fair way culvert paid under bid item 160

STRUCTURAL CONCRETE – GENERAL?

Answer: Yes, parapets on the Fairway Culvert will be paid under Bid Item

No. 160, Structural Concrete – General. Please refer to Addendum

2, Section 03300, Paragraph 1.01B.3.

Question No. 6: Paragraph J on page 02618-7 of the specification, regarding RCP installation, states that “The contractor shall install 4-foot long concrete encasement at all pipe joints.” Is this correct? Since every joint of pipe is required to be pressure tested and the pipe is backfilled with Slurry Cement and CLSM is this concrete encasement necessary? If it is necessary, would the Owner consider changing the backfill requirement to concrete encasement for the entire length of the RCP?

Answer: Please refer to Addendum No. 2, Section 02618 – Reinforced

Concrete Pipe.

Question No. 7: Plans sheets S-201 through S-207 – please provide details and call out dimensions for the widths of both drop structures. The sections provided don’t state the overall width of the structures, only the heights and depths of each step.

Answer: For drop structure 1, refer to Sections B3 and C3 on Sheet S-203.

For drop structure 2, refer to Sections B1 and D1 on Sheet S-206.

Question No. 8: Plan sheet S-204 – what bid item and specification covers the 3” diameter PVC flap gate valves?

Answer: Please refer to Addendum No. 2, Section 11285 – Flap Gate and

Pop-Up Drainage Emitter, and the addition of Bid Item No. 187a in

Document 00410 – Bid Schedule.

Question No. 9: Per the Bridge Drawings, “Do not place backfill against back of abutment until deck concrete has attained a compressive strength of 3,000 psi or concrete has been in place for 28 days. Temporarily brace abutment during construction.” Is it allowable to cover the footings prior to deck construction? Up to what depth can the footings be covered prior to the deck hitting 3 ksi or 28 days of cure?

Answer: Please refer to Addendum No. 2, Section 02305 – Earthwork, Paragraph 3.05 A.3.

Question No. 10: On drawings S-203 and S-206, there are no sections including the drop structure footing lengthwise and there is no description on where the footing starts and stops. Please provide a section view of the footings.

Answer: For drop structure 1 footing, refer to Section A1 on drawing S-202 and Section B3 on S-203. For drop structure 2 footing, refer to

Section B1 on drawing S-206 and Sections A2 and B2 on drawing

S-207.

Question No. 11: Reference Spec Section 02455.3.06.E. Please confirm that load testing will not be required for the driven steel pipe piles.

Answer: Confirmed. Please refer to Addendum No. 2, Section 02455 – Steel

Pipe Piles.

Question No. 12: Please confirm that the topsoil may be used as habitat soil backfill east of STA 37+50 per Specification 02305-2.01.E.1-2.

Answer: Soil excavated east of Channel Station 37+50 that meets requirements of Section 02305 – Earthwork, Paragraph 2.01 A.1 and E.1 may be used as habitat soil.

Question No. 13: Please provide the voltage and elevation of the proposed relocated powerlines on Evans Rd, reference Drawing No. C-1001 & E-201.

Answer: The power poles are 75’ in height and have two powerlines: 115 kV and 12 kV, poles and lines to be installed by Southern California

Edison (SCE):

1. 115 kV line is approximately at 68’ height above the ground.

2. 12 kV line is approximately at 43’ height above the ground.

3. The required underground work to be performed in this contract per the contract drawings is for 12 kV line.

4. Communication lines will be installed below the 12kV lines but should have a minimum clearance based off the NESC.

5. Vertical height for all conductors are per final design from SCE.

The vertical heights should be field verified prior to start of work.

Question No. 14: The proposed relocation of the SCE overhead powerlines on Evans

Rd is scheduled to be completed prior to construction, per the project bid walk. The overhead powerlines will become a conflict with the pile installation due to the proximity of the centerline of the power poles and the Abutment No.4 easterly footing. Please confirm that the intent is to have spliced piles. If spliced piles are not recommended, please provide a revised layout for the overhead powerlines. Refer to Drawing No. S-507, S-504, and C-1001.

Answer: The relocated SCE powerlines will cross over near the westerly abutment pile locations. Pile splices will be allowed to enable the use of shorter segments to drive piles in low-headroom situations.

Question No. 15: Reference Drawing No. S-404 and C-1319. There is a constructability issue between the proposed Lake Perris Drive detour on Drawing No. #C-1319 and the proposed Abutment No. 1 return wall on the southeast corner of Lake Perris Drive. Please provide a location of approved construction joints in the Abutment

No. 1 return wall/footing, or please provide a new layout for the

Lake Perris Drive detour to accommodate the monolithic pour of

Abutment No. 1 footing.

Answer: Please refer to Addendum No. 2, drawings S-404 (Sheet 322), S-407(Sheet 325), and S-411(Sheet 329).

Question No. 16: Is flagging required for all inbound and outbound trucking and/or deliveries?

Answer: Yes, please refer to the notes on Drawing No. G-114 and Section

01551 – Public Safety and Traffic Controls, Paragraph 3.01 I.

Question No. 17: Per section 00701.e, the contractor must maintain an all-wheel water truck or fire truck with a water tank of at least 3,000 gallons and the truck's tank must be full at all times and may not be utilized for construction. May we use the working water truck for this piece, or does it really have to be a standby water truck that can have no other duties?

Answer: As stated in Document 00701 – Safety, the truck’s water tank must remain full and shall not be used as a source of construction water without prior written approval by the Engineer. The intent is to have the water truck available for fire control if needed.

Question No. 18: The chain link fabric that is written into the specifications is not readily available. May the contractor use the attached material as an as equal alternate?

Answer: Please refer to Addendum No. 2, Section 02820 for clarifications on the type of fabric.

Question No. 19: The portions of the C line channel that are upstream of the drop structures have a 2% fall to the low flow section in the middle. The drop structures shown on sheets on S-201 through S-207 tie into these channel portions. It is unclear if the entire drop structures should also have a 2% slope towards the center to mimic the channel, or if the top section of the drop structure should be tapered to match the channel, and the rest of the drop structure be placed flat. Please confirm the cross slope of the drop structure concrete. See attached sketch for clarification.

Answer: The entire drop structures have a 2% slope towards the center of the channel “C” Line, as shown on Drawing Nos. S-203 and S-206.

Question No. 20: Reference Specification Section 02512, Part 2.07.A.4 and Part

2.07.B.4: Both sections apply to Fittings and specials. Part 2.07.B.4 specifies 2” x 4” No. 12 welded wire fabric except handwork reinforcement. Part 2.07.B.4 states that cement mortar lining shall meet the requirements of straight pipe with the handwork lining using wire fabric. They contradict each other. We only use wire fabric in the hand patch areas of fabricated fittings. Please confirm that the wire fabric is only required for handwork lining.

Answer: Confirmed.

Question No. 21: Reference Contract Drawings C-1004 and M-110: The pipe joints for the 24” CML&C steel pipe are full weld double pass. The welded joint detail on Drawing M-110 shows a bell and spigot rolled groove with gasket and a filler rod. The gasket is obsolete in a fully welded joint. Will you allow a lap welded joint, as specified in Specification

02512, Part 3.04, in lieu of the rolled groove joint?

Answer: Yes, welded lap joints are acceptable.

Question No. 22: Reference Contract Drawing C-1004: The tie-ins to the existing 24”

CML&C pipe call out a 24” FxPL spool and install insulating joint.

Note 3 references Drawing C-819 for pipe connections to existing pipe. Per drawing C-819 the connections to existing pipe are flanged joints. Is it your intent that our pipe end with a flanged end and a ship loose flanged will be field installed? Or do you want us to provide a flange x plain end spool with a loose buttstrap for a buttstrap connection to existing pipe. Please clarify.

Answer: Connections to existing steel pipe should be done with flanges so that we can insulate the joint. Do not butt-strap the existing pipeline as there is no way to insulate a butt strap.

Question No. 23: Reference Contract Drawing C-1004: The horizontal elbows are called out as 24” 90° FxF Bend and the vertical elbows are called out as 24” 22.5° HxH Bend. We could not find any abbreviations for these in the contract drawings. We are assuming that the FxF means flanged x flanged. What does HxH represent?

Answer: FxF = flange by flange, HxH = hub by hub, PL = plain end.

Question No. 24: Reference Contract Drawing C-1004: Assuming FxF represents flanged joints, can we eliminate the flanged joints at the elbows?

Flanged joints at elbows are typically used for short body ductile iron fittings. They are not normally required for AWWA C200/C208 steel pipe fittings.

Answer: If this is buried pipe, then welded joints are typical and flanged joints are not desired unless we need isolation kits at the joints. If this is exposed pipe, then flanged joints are typical to allow disassembly.

Question No. 25: The Evans Road Utility Relocation drawing C-1001 (sheet 184) identifies the Southern California Edison (SCE) overhead electrical line relocation alignment. The plan doesn’t provide any details regarding the relocated wire elevation(s) and corresponding voltage. Please provide the overhead electrical line voltage and elevation(s) in order to determine the minimum clear work distance as required by Cal OSHA.

Answer: Please refer to Question No. 13.

Question No. 26: Is a specific style of “Decorative Metal Panel Fencing” to be used?

The drawing per C-1604 Shows a Pre-Manufactured Panel but the

ASTM A588/A242 is not used for fencing material and is hard to come by.

Answer: Please refer to Addendum 2, Section 02820- Fencing and gates for clarification on Decorative metal fencing and gates.

Question No. 27: Is there a specific “manufacturer” to be used?

Answer: Please refer to Question No. 26.

Question No. 28: Is a Specific “Fencing” spec to be provided?

Answer: Please refer to Question No. 26.

Question No. 29: Are Post size, Rail Size available. Is attachment of panel to post per drawing?

Answer: Please refer to Question No. 26.

Question No. 30: Is the electrical contractor responsible to furnish and install the transformer KAA (it’s a 225KVA, 3P, 12KV-480V)?

Answer: Yes.

Question No. 31: Is the electrical contractor to furnish and install the 12KV 1200A switchgear U1A?

Answer: Yes.

Question No. 32: Will DWR accept the attached specification for the fabric to be installed on the chain link fence in lieu of what is being called out in the specifications. We are seeing multiple suppliers can’t supply what is spec’d out. Please advise.

Answer: Please refer to Addendum No. 2, Section 02820 for clarifications on the type of fabric.

Question No. 33: Reference Bid Item 196 - Grounding Cable – No. 4/0 AWG Bare

Copper Wire, does the quantity (3,500 LF) include the Grounding

Cable for the Duct Banks as shown on Drawing No. E-506 & E-507, or is the Grounding Cable in these details being paid under Bid

Item 212 – Duct Bank. Please clarify.

Answer: Bid Item No. 196, Grounding Cable – No. 4/0 AWG Bare Copper

Wire, includes grounding conductors for the Duct Banks.

Question No. 34: Reference Drawing E-402, callout “New Light Pole with Fixture See

DWG E-508”. Does this Light Fixture (Qty of 1 EA) fall under Bid

Item 233?

Answer: Yes, please refer to Section 16500 – Lighting, Paragraph 2.01 A.4 and 4.01 A.

Question No. 35: Reference Drawing E-401, Note 9 “Additional equipment may be required to reconnect service”, will this additional equipment be provided by SCE? If not, please clarify what additional equipment will be required.

Answer: Additional equipment will be provided by the Contractor. Drawing

No. E-401 only shows the power pole and conductors. Other equipment is not shown but specified in Section 16311 – Overhead

Distribution Equipment.

Question No. 36: Please clarify the location and flowrate of the dam seepage system.

Answer: Please refer to Drawing No. R-011 for the location of the dam seepage collection system. Please refer to Section 02240

Dewatering, Paragraph 1.06 A.2 for minimum design flow rate to be assumed for Drainage Lines No. 1 and No. 2.

Question No. 37: Please clarify whether this project is subject to the Buy America

Act.

Answer: There are no Buy America Act provisions in this contract.

Question No. 38: Please clarify whether the filter fabric shown wrapped around the

CTPB in the bridge drainage systems is paid for in the filter fabric item. Where is the CTPB to be paid?

Answer: For the Bridge Drainage System, both the filter fabric and CTPB will be paid under Bid Item No. 110, Bridge Drainage System, per

Section 02645 – Bridge Drainage System, Paragraph 1.01 A.

Question No. 39: Please clarify the type of Rip Rap that DWR would like contractors to purchase for RSP Type 2. 1 TON, ¼ TON, 300 LB, etc…

Answer: Please refer to Section 02305 – Earthwork, Paragraph 2.01J for

Type 2 RSP requirements.

Question No. 40: Is there a Buy American or Buy America for this project?

Answer: Please refer to Question No. 37.

Question No. 41: Is there any recommended manufacture for the decorative fence and gates?

Answer: Please refer to Question No. 26.

Question No. 42: Decorative fence, is there a picket and posts size recommended for this detail?

Answer: Please refer to Question No. 26.

Question No. 43: Please be aware that the alignment of the temporary road to be constructed at Lake Perris Drive conflicts with approximately 9’ of the abutment return wall, and the entirety of RW-2. There may be engineering concerns that cannot be analyzed by the contractor in putting traffic back onto Lake Perris Drive while the abutment lacks a return wall.

Answer: Please refer to Question No. 15.

If there are additional questions, please send to doe_specs@water.ca.gov.

Sincerely, Judy Li, Manager Contract Coordination Section Division of Engineering