22-09_Information_Letter_No._7.pdf

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

DEPARTMENT OF WATER RESOURCES

P.O. BOX 942836

SACRAMENTO, CA 94236-0001

August 29, 2024

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. 7

The following questions have been received for clarification. The Department of Water Resources (DWR) answers are given immediately following the questions.

Question No. 1: There is a lump sum item for BMP's but there are no SWPPP for contractors to bid off of. Caltrans typically provides unit price bid items for BMPs. Please add bid items for the different types of BMPs that we may see on this project.

Answer: There is no lump sum item associated with BMPs. The Contractor is responsible for SWPPP as defined in Section 01570 - Environmental Protection. The cost for the items specified in Section 01570 - Environmental Protection shall be included within the overall construction cost.

Question No. 2: The specifications mention that various structures like junction structures, drainage outlets, retaining walls, and other structural concrete items are all included under bid item 160. To improve clarity, please consider creating separate bid items for each of these structures that require structural concrete. This way, each item will be quoted individually, making it easier to understand and manage the costs associated with each specific structure. This will also make it easier to track in the field if there are quantity issues or DWR directs us to construct additional work.

Specification No. 22-09 Information Letter No. 7

Answer: All the features included under Structural Concrete – General have the same material properties and installation requirements. This is the reason why they are all included in the same bid item.

Question No. 3: Plan sheet C-409 detail A1 shows preformed grooves. Please provide specifications for this work. Can these be formed by tools while placing the concrete or do they need to be a plastic strip material? Do these require sealing after the concrete has cured?

Answer: Preformed grooves formed by saw cutting concrete after concrete hardening is not allowed unless approved by Department. Sealing is not needed for the groove after the concrete is placed. Please refer to Addendum No. 4, Section 03300 – Cast-In-Place Concrete, Paragraph 3.09 D.

Question No. 4: Specification section 03600 “Rock Grout” – 1.01 Description item 3 has a location downstream of the Flow Control Structure as shown.

Please identify what plans pages has the information for the Flow Control Structure.

Answer: Changes have been made to the Specification to clarify the locations where the Rock Grout is used. Please refer to Addendum No. 2, Section 03600 – Rock Grout.

Question No. 5: Will CADWR provide both plans and specifications for all work to perform temporary erosion control - best management practices that will be required for this site? Please add necessary bid items to cover the work for installation, maintenance, and removal of temporary erosion control measures.

Answer: Please refer to Question No. 1.

Question No. 6: Please provide Brown Trunk Height (BTH) and detail of Palm Tree.

Answer: The BTH of the palm trees shall be 15', please see Drawing No. C- 1703 for plant schedule.

Question No. 7: Refer to Bid Schedule/ Addendum #1, the quantities of bid items numbered #147 and #148 are different from the takeoff quantities per plans/ sheets C-302 through C-310 and C-402 thru C-407.

Please clarify.

Answer: For Bid Item No. 147, Final Stabilization Seeding: The 85 acres is for the levee slopes plus the entire SRA area as well as the sides of the drainage ditch/bio retention swale along Ramona expressway.

For Bid Item No. 148, Bioretention Swale Seeding: DWR revisited the quantities for the Bioretention Swale Seeding and 0.25 AC is correct. Please also refer to Drawing C-721 for the Bioretention Swale Seeding quantities.

Question No. 8: Irrigation legend/ sheet C-1708 shows irrigation sleeve material is PVC Schedule 80. However, specification section 2.15/ 02936 - Irrigation indicates that Irrigation Pipe Sleeves shall be PVC schedule 40. Please verify.

Answer: Irrigation pipe sleeve shall be Schedule 80. Please refer to Addendum No. 4 for updated Section 02936 - Irrigation System.

Question No. 9: Please provide details of Remove Control Valve and Sprinkler Heads and that shown on irrigation legend/ sheet C-1708

Answer: Standard Hunter PGV-101G Remote Control Valve and Pro-Spray Pop Up Sprinkler Body PROS-12-PRS30-F-R.

Question No. 10: Please provide the size of conduit for irrigation control wire.

Answer: Please refer to Section 02936 – Irrigation System, Paragraph 2.15 B for size of the conduit for irrigation control wire. Please also see updated Section 02936 Paragraph 3.05 E in Addendum No. 4.

Question No. 11: For Reference Drawings R-007 and R-008, please confirm that the "Evans Rd" is an error and that the correct street name should be Fair Way.

Answer: Yes, confirmed. The street name is incorrect on the as-built drawings. The correct street name is Fair Way.

Question No. 12: In Spec Section 01550-3.02.C.3.b it states that neither work or deliveries impinge upon the public to access the fairgrounds and or state park. Will DWR require the contractor to install temporary Lake Perris Dr detour road and complete the new permanent Lake Perris Dr between the months of November to September? Or will the contractor be allowed to work westerly of the temporary detour during the restricted time frame?

Answer: Pursuant to Section 01550 – Right of Way, Access Restriction, and

Work Site Security, Paragraph 2.03 C.3) a., the Contractor is not allowed to work from Drop Structure No. 1 (Channel Sta. 4+00) to Lake Perris Drive (Channel Sta. 27+00) for up to two weeks in October. However, the Contractor may seek permission from the Fairgrounds to relax these restrictions.

Question No. 13: On Sheet C-902 Note 6, it identifies that there is an "unidentified utility see Note 6". Note 6 states "contractor shall pothole to verify if there is an existing utility located in the vicinity, determine if the utility is active, attempt to locate the owner and remove or relocate as directed by the engineer." Will DWR have an allowance bid item for these potential unforeseen utility relocations and miscellaneous work associated with coordination and planning of the work.

Answer: Potholing shall be included as part of Bid Item No. 60, General Excavation. Please see Addendum No. 4 for updated Section 02305 – Earthwork. Work related to unforeseen utility relocations coordination and planning will be handled in accordance with Document 00707 – Changes.

Question No. 14: Reference Bid Item 73 - CLSM Type 1 and Specification Section 02320 1.01 A. Given the locations specified in Section 02320, our quantity takeoff for the Bid Item 73 is significantly lower than what is given in the SOV. Please provide further clarifications on the quantity and locations for the CLSM Type 1.

Answer: Bid Item 73 - CLSM Type 1 is updated as per sections A2 and A6 on Drawing No. C-903. Please refer to Addendum No. 4, Document 00410 – Bid Schedule.

Question No. 15: Reference Bid Item 74 - CLSM Type 2 and Specification Section 02325 1.01 A. Given the locations specified in Section 02325, our quantity takeoff for the Bid Item 74 is significantly lower than what is given in the SOV. Please provide further clarifications on the quantity and locations for the CLSM Type 2

Answer: Bid Item 74 - CLSM Type 2 is updated as per section C4, D5 and B5 on Drawing No. G-116. Please refer to Addendum No. 4, Document 00410 – Bid Schedule.

Question No. 16: Please confirm that Rebar for the Bridge Items (Items 158 & 159) is included in Item 156, Reinforcing Steel Bars.

Answer: Yes, confirmed as per Section 03210 – Concrete Reinforcement, Paragraph 1.01.

Question No. 17: What is Note 3 for Table 03300 A? Is Note 2 supposed to be Note

3? If that is the case, what is Note 2?

Answer: Please refer to Addendum No. 4, Section 03300 – Cast-in-Place Concrete.

Question No. 18: Please allow the ability to predrill an open shaft at 14" diameter (diameter of steel pipes) for the full depth of each of the piles (both battered and vertical).

Answer: Please refer to Addendum No. 4, Section 02455 – Steel Pipe Piles for alternate pile installation method.

Question No. 19: Please allow the thickness of the steel pipe piles to be 5/8" thick in order to avoid potential damage while driving in the hard soils/weathered granite.

Answer: Bidder shall assume the thickness of the piles as shown on Drawing No. S-605.

Question No. 20: We are requesting consideration for an adjustment to the specified plumbness tolerance for the battered piles as outlined in Specification Section 02455-8, Section I-1, Note C ("Straightness:

+/- 1.0 percent over the length of the pipe"). The equipment required for predrilling the battered steel pipe piles will not be able to maintain the specified 1% plumbness due to the depth and challenging geological conditions at the site. Given these constraints, we request that the allowable plumbness tolerance be increased to accommodate the field conditions.

Answer: Please refer to Addendum No. 4, Section 02455 – Steel Pipe Piles for alternate pile installation method.

Question No. 21: Concerns are being raised by the local Ready-Mix Concrete suppliers regarding the following job requirements: Section 03300 – Cast-in-Place Concrete, Paragraphs 2.05C.1, 2.05C.2, 2.07B, 2.07E.

They are stating “Our SRAs (ISO SRA 2000 and ISO SRA 2800) would not meet this spec. This was written specifically for shrinkage compensating additives (up to 100% or more shrinkage reduction) and shrinkage reducing admixture (SRA) generally can reduce shrinkage up 50%. If the shrinkage requirement can be reached with a traditional SRA then a case could be made for using a traditional SRAs, but many times the specifying engineer doesn’t know how much shrinkage is acceptable, they just figure less is better. Those shrinkage compensating additives are generally in powder form not liquid form.

“Other examples of shrinkage compensating additives are CTS Komponent and Euclid Conex, but those are not magnesium based. The only MgO based shrinkage compensating additive that I know of is made by Premier and Sika as referenced in the spec.

They are likely the same product made by Premier and Sika relabels the product and resells. “

Please consider relaxing/revising the specifications to be more in line with Caltrans requirements as that is what they are most likely to be able to satisfy at a reasonable cost.:

Answer: See Specification Section 03300 – Cast-In-Place Concrete, Paragraph 2.07 B: “Shrinkage reducing admixture or shrinkage-compensating admixture may be used.”

SRAs shall meet the requirements specified in Section 03300 – Cast-In-Place Concrete, Paragraph 2.05 B.

Paragraph 2.05 C in Section 03300 – Cast-In-Place Concrete was modified. Please see the revised section in Addendum No. 4

Question No. 22: Reference Drawing C-213 - Fairgrounds Sign. Can you please provide the as-builts and/or details (LED Sign weight, dimensions, rigging points, structural details) of the Fairgrounds Sign. Please also indicate if the LED sign is to be salvaged and if so, please provide a delivery location.

Answer: Bid as shown. Regarding disposal of the sign, please see Section 02220 – Selective Demolition, Paragraph 3.41.

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

mailto:doe_specs@water.ca.gov