August 31, 2001rcconstructionservices.com/Bid Board/Tustin Metrolink Parking Struc… · 16010-Part 1, Paragraph 1.01 A.8. –removed requirement for conduit to run below gas line

IFB 0-1529 Addendum No. 4 Page 3

Attachment A

Clarifications, Questions and Responses


Attachment B

Stormwater Filtration System – 02722


Attachment C

Revised Specification drawings

Parking Structure Construction at the Tustin Metrolink Station IFB 0-1529 Addendum No. 4 – Clarifications, Questions and

Responses Addendum #3

1. Revised Addendum #3 Item #8 to reference Spec 01330-2.03 A, not 01325-2.03 A,

Specifications

1. Removed text from specifications 02070-6 1.04 C. Removed the words “See Section 01576-6.”

2. Replaced and added text in specifications

03450-6 2.05 J. Replace “Natural concrete color” with “To match appoved sample. Replace “Finish:” with “Finish: Integral colored finish”.

3. Added new section 02722 Stormwater Filtration System in specifications

4. Removed text from specifications.

16010-Part 1, Paragraph 1.01 A.8. –removed requirement for conduit to run below gas line.

5. Replaced text in specifications 16510 Lighting – 2.02 General Material Requirements, H, d: Replaced Daylight Harvesting Sensor with Photo Sensor.

Drawings

1. TD0.1_Added “12. PV Array” in the Deferred Submittal Item List.

2. C-4_Revised Sheet C-4 General Demolition Note No. 6.

3. C-6_Revised Sheet C-6 to add Construction Note 40 for the installation of a new 72” by 94” SCE transformer pad as located on the Grading Plan as a Contractor responsibility. Contractor shall comply with SCE requirements for the transformer pad requirements and installation.

4. C-9 & C-10_Revised Sheets C-9 and C-10 to delete three Kristar Up-Flo Filters (formerly Const.

Note 23) and two concrete pipe transition structures (formerly const. Notes 29 and 30); added a off-line Kristar Perk Filter (Const. Note 23); replaced Manhole No. 8 standard storm drain manhole with an Diversion Manhole (Const. Note 28); and added curb inlet screens to all catch basins (Const Note 29).

5. C-9_Revised the 2-inch private domestic water line (Const. Note 57) pipe alignment and length

for service connection to the parking structure on Sheet C-9. 6. C-9_Deleted Detail “J” from Sheet C-9.

IFB 0-1529 Addendum No. 4

Page 2 of 15

7. C-9_Revised Sheet C-9 and Construction Note 27 to delete the 15-inch PVC pipe and clarify the

use of 12-inch PVC (SDR 35) storm drain pipe for connections between the Perk Filter and Storm Drain Manholes #8 and #3 and from Storm Drain Manhole #5 to the “point of connection” with the parking structure 12-inch drain line.

8. C-9_Revised Sheet C-9 and Construction Note 30 to clarify construction requirements for

existing catch basin upstream of Storm Drain Manhole #4.

9. C-11_Revised storm drain profiles for Lines A-1, B-1 and C on Sheet C-11 to delete in-line Up-Flo Filters, concrete pipe transition structures and 15-inch PVC; added references to 12-inch PVC at Storm drain Manholes #8 and #3; reduced the length of construction for Line A-1 to begin Line A-1 improvements at Storm Drain Manhole #3; and replaced the Up-Flo filter in Line C with 12-inch PVC pipe and the Up-Flo Filter in Line B-1 with 18-inch RCP.

10. C-14_Revised Sheet C-14 to delete the Up-flow Filters and add the Perk Filter as part Phase II

erosion control system.

11. C-15_Revised Sheet C-15 to delete Up-Flo Filter Detail and add Perk Filter Detail 23 and Diversion Manhole detail 28 to the standard Detail Sheet.

12. C-16, 17 & 18_Revised prints of Sheets C-16, C-17 and C-18 that now bear IRWD approval signatures. The copies of the IRWD signed plans will be issued to the successful contractor.

13. A5.1_Revised Finish Note #1 in sheet A5.1 Replace “Powder coat all exposed metal.” with “Hot-dip Galvanize all exposed metal, U.N.O.”

14. A5.1_Added Finish Note #6 in sheet A5.1

Add “6. All precast panels and cornices are to be intergral colored finish, and the finish color to be matched to ‘SW 2006 Mocking Bird’.”

15. A8.1_Added wall type symbols for the elevator control room in detail 1 in sheet A8.1.

Add Wall type symbol ‘C’ for the elevator control room, typical for all four sides.

16. A8.6_Revised elevator glazing elevation on details 1 & 2 in sheet A8.6 to match the section detail 1 in sheet A8.4.

17. A9.3_Revised precast cornice dimesion in detail 16 in sheet A9.3.

Delete precast panel thickness dimensions 6” and 2”, and add overall thickness 7” on detail 16A/A9.3.

18. A9.2 & A9.5_Revised boxed notes on detail 16 in sheet A9.2 and details 11 & 13 in sheet A9.5.

Add “U.N.O.” to read “All exposed metal to be hot-dip galvanized. Typ. U.N.O.”. 19. M0.1_General Notes and legend:

Removed Sump Pump from Mechanical Schedule. 20. M2.1_1st Floor Elevator and restroom HVAC Plan:

Note #7: Replace “Thermostat” with “Thermostat Controller”.


Page 3 of 15

21. P2.1_1st Floor Plumbing Plan:

Storm Drain Back Water Valve; Route 4” SD from drain from C13/B.3 to outside of structure. Provide 4” backwater valve model Clean Check then connect 4” and 12” SD and route to manhole.

22. E0.2_Single Line Diagram:

• Added UGPS on Single Line Diagram. • Added Voltage Drop Calculation on Sigle Line Diagram. • Added NEMA 3R Enclosure on switchboard “MSB” in note 2.

23. E0.3_Site Electrical and Enlarged Electrical Room Renovation Plans:

• Added preliminary SCE transformer design. • Added new feeder to Panel “A” to avoid parking structure in the North-West corner. • Removed switchboard “MSB” from the electrical room. • Relocate switchboard “MSB” to South-West corner of Parking Structure.

24. E2.1_1st Floor Lighting Plan:

Showed underground routing for clarification only. 25. E2.1 thru E2.4_1st thru 4th Floor Lighting Plans:

Added flush mounted j-box with circuit in column 2/A.6 for future pay stations. 26. E2.5_5th Floor Lighting Plans:

• Added flush mounted j-box with circuit in wall at 1.1/A.6 for future pay stations. • Revised Ligth fixture locations.

27. E3.3_2nd Floor VSS Room Enlarged Lighting, Power and Grounding Plans:

Showed underground routing for clarification only. 28. E3.4_Electrical Details:

Removed Lighting Control Panel Wiring Detail and Schedule (Detail 5), and Photocell Wiring Diagram and Lighting Control Relay (Detail 6).

29. E3.5_ Electrical Details:

• Revised the Depth of the Typical Duct bank Section Detail to 36” (Detail 5). • Added Detail #5 – Switchboard “MSB” Elevation.

30. E5.1_ Site Electrical Demolition Plan:

Added new and existing feeder configuration to panel “A” and Panel “B” for clarification. It demonstrate via single line wiring diagram, note 6 & 7, general note 1, & feeder route to Panel “A”.

31. ELC5_ 5th Level Photometrics:

Revised Photometrics per revised 5th Floor Lighting Plan. 32. T1.1_ Security Conduit Site Plan:

Clarification of telecommunication conduit routing.


Page 4 of 15

33. G1.1_Revis sign locations 1-030, 1-050 and 1-051 to sign type S1 on location plan and sign

schedule. Adjust text in sign schedule for location 1-026 to Pedestrian Entrance. 34. G1.2_ Fill in missing sign location and sign type call outs for the following: 2-030, is Sign Type

D2, 2-031 is Sign Type R2, 2-032 is Sign Type D2 and 2-033 is Sign Type W1. 35. G1.5_ Adjust sign location 5-020 to read “METROLINK” and Sign Type S8. Adjust Sign

Location 5-021 to read “TUSTIN STATION” and Sign Type S12. Sign location 5-031 add text (City of Tustin Logo) to sign schedule.

36. G2.2_ A Add layout for Sign Type S12 (15” high illuminated letters similar to Sign Type S6).

Questions/ Answers

1. Reference Bid Form - Page 3 of 4, item # 11 which says “ If awarded a contract resulting from this bid, Bidder will cooperate with the Authority in meeting commitments and goals with regard to the maximum utilization of DBE firms…..” but no particular goal amount is mentioned. In the pre-bid conference on June 10th it was stated there is no pre-determined goal requirement. Please confirm there is no published pre-determined goal for DBE participation at this time? Response: Correct, there is no published pre-determined goal for DBE participation.

2. Reference the Kinder Morgan Letter dated June 25th, 2009 on sheet C-15 and Existing 16” OIL

Line noted on Sheet C-9 and C-10. The Kinder Morgan letter implies there is an active 16” high pressure petroleum pipeline within the limits of work. Drawings C-9 and C-10 depict a 16” OIL Line to protect in place that is approximately 55’ North of the proposed parking structure. Is the 16” high pressure pipeline referenced in the Kinder Morgan letter and the 16” OIL line referenced in drawings C-9 and C-10 one in the same?

Response: Yes.

3. In the Pre bid meeting the question was asked if it acceptable to place a Statement of

Qualifications along with other marketing type materials in the bid envelope along with the bid form. Our understanding is that it will be acceptable to do so. Please confirm?

Response: You may include exceptions to the proposed agreement. However, you may not qualify the bid. You are bidding the project in accordance with all the terms, conditions and specifications. Specific company information is welcome, but you are requested not to include generic marketing material.

4. Reference Steel Pipe and Fitting Specification 15061, paragraph 1.01 Scope which says “This

section specifies steel pipe and fittings specified in paragraph 15060-3.8” but there is no paragraph 3.8 in spec 15060. What paragraph do you mean to reference to specify steel pipe and fittings?


Page 5 of 15

Response: Will update specification 15061 paragraph 15060-3.8. to 15060-3.7 and will update specification 15060 3.7 to include steel pipe.

5. Reference specification 15300 paragraph 1.02 - WORK INCLUDED: Is it the Owners intent that the sprinkler system is to be designed to meet Factory Mutual requirements or are NFPA and local codes only required when considering the design?

Response: This is design build. Designer to meet Factory Mutual (FM), NFPA 101- Life Safety Code, Owner Standards, NFPA Fire Protection Standards, Underwriters Laboratory (UL), local and state regulation.

6. Reference Level 3 Safety Specifications 2.3 Designated Safety Representative paragraph D says “Authority’s Project Manager reserves the right to require Contractor to provide one full time qualified person as a safety representative whenever the Contractor and its sub-tier contractors, suppliers and vendors meets or exceeds 10 workers, or warranted by scope risk.”. The Contractors work force including sub-tier and vendors will average approximately 30 to 50 persons on site at a given time. For the purpose of bidding the work should we anticipate the cost of a full time Safety Representative?

Response: Yes, a full time Safety Representative will be required for this job.

7. Reference Notes on sheets A9.2 / Also reference sheet A9.5 Note 1 on Typical Finish Notes.

Notes on sheets A9.2 and A9.5 says “All exposed metal to be hot dip galvanized typical”; Note 1 of Typical Finish Notes on sheet A5.1 says “Powder coat all exposed metals”. It is impracticable to both powder coat and galvanize all exposed metals. Please clarify.

Response: Metal finish will be either hot-dip galvanized or powder coated. All exposed metal are to be hot-dip galvanized, unless specified to be powder coated in the drawings or specifications.

8. Reference Concrete Note 14.A on sheet S1.1 which requires dry shrinkage not greater than

.036% at suspended post-tensioned slabs and non-ductile beams. To meet this requirement we must include a shrinkage reducing admixture in the suspended slab ready mix which adds approximately $100,000 to the cost of the project. We can attain .046% dry shrinkage with specified local aggregates without the use of a shrinkage reducing admixture. Is it acceptable to bid the work using .046% dry shrinkage as the requirement for the suspended post-tensioned slabs and non-ductile beams?

Response: Dry shrinkage requirements are per S1.1 and the use of a shrinkage reducing admixture is acceptable.

9. Detail 6 on sheet S7.1 of the drawings has water tight anchorage requirements that indicate the post tension system is encapsulated. Encapsulated post tension systems cost approximately 20% more than non-encapsulated. Is it your intent that all bidders are to include an encapsulated post tension system?

Response: Provide an encapsulated system.

10. Note #3 sheet E0.3 – This note identifies a junction box with circuitry located across the main

line of the tracks. What is the intended routing of this proposed conduit?


Page 6 of 15

Response: The scope of work for this contract is all on the South side of the railroad tracks .The scope of work under this contract is to run conduit with power and data to the signal house Jbox. The GC installing the VSS system will take over at the signal house Jbox and run power and data lines in existing conduit under the tracks.

11. In the base-bid design, switchboard MSB appears to be located on the exterior wall of the

building. Please confirm MSB should be nema-3R.

Response: “MSB” shall be in NEMA 3R enclosure. 12. Note #4 on sheet 0.3 indicates a new transformer by SCE. What is the concrete substructure

required for this transformer (6’ x 8’ slab-box or pad only or 8’ x 10’)?

Response: Per SCE, the new transformer pad shall be 94” x 72” with conduit access for transformer. Final construction document from SCE to follow.

13. Fixture schedule identifies both type “A” and “A1” fixtures for the typical garage level lighting.

Type “A1” is not identified anywhere in the design. Is this correct?

Response: Fixture Type “A1” are used under (3) canopies at the bus terminal. See sheet E0.3. 14. E2.1 thru E2.5 – UBC requires exit signage throughout the garage, however, the current design

only shows exit signs on the ground level in a couple of locations. Additional exit signs will be required. Please provide locations on all levels.

Response: Provide illuminated exit signs on the 2nd through 5th levels of parking structure at both stair cases. On the ground level provide an illuminated exit sign between the elevators and at the column at grid lines A/11.

15. PV E0.3 ALT design shows the SCE meter board MSB located within the electric room along

with the Emergency power inverter and the PV Inverter. SCE will not allow their meter-board to be collocated with any battery inverter equipment. Also, as a condition of the PUC for PV Systems, the PV Inverter must be located in a separate room altogether. Please modify the design accordingly.

Response: MSB is located on the southwest corner of the parking structure and shall include an Underground Pull Section and meter socket.

16. E2.5 – Light poles on the roof are called out as type “B1” which is specified with a 25’ pole.

Should these units be type “B2” which is specified with a 15’ pole?

Response: Fixture type “B2” are used on the 5th floor parking structure with 15’ poles. 17. Alternate Bid PV E2.5 ALT – Shows light fixture type “B” to be located under the PV structure,

however, fixture type “B” is specified with a 25’ pole. Electrical Engineer should provide a modified specification for the correct fixture under the PV structure.


Page 7 of 15

Response: For Alternate Bid PV E2.5 ALT, LSI Crossover light fixture shall be used and surface mounted on the end of PV structure, Model # XAM-3-LED-119-CW-UE-PCI 120. Type A1 shall be mounted under the PV structure.

18. Note #5 on sheet E5.1 – Removal of the existing Telephone Utility conduit and conductors is

required prior to mass excavation of the site. This process must be originated by the Engineer of Record with drawings submitted to the appropriate Utility (AT&T or Verizon). Has this been done yet? If so, please provide the contact name and phone number of the individual that is handling this removal for the utility. Are there any provisions being made for a temporary rerouting of cable if necessary?

Response: Watry Design has the contact information for the AT&T rep. and is coordinating with them. The contact information will be provided after GC is selected. The intent is to place new telephone cable prior to excavation of the site so as to maintain telephone service.The contractor shall be responsible for protecting the existing services until the new services have been installed and for the removal of the existing services.

19. Photometric values provided on sheets ELC1 thru ELC5 are very low by parking structure

lighting standards. Current IES guidelines indicate a minimum level of 5-6 foot-candles is required, this current design is not quite 4 fc.

Response: The lighting plan has been revised to achieve a maintained 5fc in the parking structure. See revised lighting plan and Photometrics plan.

20. Photometric drawings are inconsistent with the quantity and locations of light fixtures on each

level compared to the lighting floor plans E2.1 thru E2.4. Please provide corrected plans as necessary.

Response: The bid plans E2.1 thru E2.5 are correct in both the quantity and location of lights. The photometric plans are not to be used for purposes of bidding the project.

21. Sheet E3.4 – Current lighting control design makes no provisions for controlling various fixtures

on Level 1 thru Level 4. Title-24 requires the ability to automatically turn “off” lighting circuits, however, the type “A” fixture specification using the motion detector and bi-level ballast only reduces the fixture output to 50%.

Response: The light fixtures in the parking structure require to be on 24/7. The fixtures are adjustable to dim down to 10% when the parking structure is not occupied.

22. ELC1 thru ELC5 – City of Tustin requires 1 foot-candle illumination along the path of egress.

Path of egress is deemed to be the entire drive aisle. The current design utilizes motion detectors on all type “A” fixtures means some of the fixtures would be at 50% illumination during and may not provide adequate coverage. Please review this requirement.

Response: Type A light fixtures will illuminate to 100% when motion is sensed, thus lighting illumination is adequate.

23. T-24 form on E3.6 indicates there are 22 luminaries for type “B2” on the project, however, the

current floor plans and site plan do not identify the type “B2” being used. Please clarify.


Page 8 of 15

Response: Fixture type “B2” are used on the 5th floor parking structure. See sheet E2.5.

24. Sheets E0.3, Site Electrical: Note 2 indicates a 1” conduit is required for data feed originating at

the SW corner of the Parking Structure. However, there is no indication where the conduit gets terminated. Please advise.

Response: Refer to telecom drawings sheet T1.1 for this work.

25. Is there a Telephone Backboard required? If so, where is it to be located?

Response: Telephone backboard are in VSS room on the second floors. See sheet E3.3, VSS Room Enlarged Power and Grounding Plan.

26. Sheet E3.3, Elevator/Machine Room Detail: Information provided in the detail does not

coordinate with the single line diagram on Sheet E0.2. Please clarify.

Response: See revised single line diagram on sheet E0.2 and Elevator /machine Room Detail, sheet E3.3.

27. Sheet E2.5, Fifth Floor Lighting Plan: Notes 1, 2 and 3 indicate conduit is to be provided for

future blue phones and CCTV. Is this a unique requirement to the fifth level or does it apply to all levels. Note the other levels require wire in the conduits and there is no reference made to “future.”

Response: The junction boxes on the Fifth level have conductors which are stub ups from the Fourth level.

28. Sheet E3.1 First Floor Power: Receptacles are shown at various locations. Are these receptacles

required? If so please provide circuit information.

Response: There are no receptacles shown on sheet E3.1. 29. Precast Concrete Spandrels (Color/Finish): Drawing / Spec reference A5.1, A5.6, A5.7; Spec

03450 2.05H: Question - Architectural drawings indicate precast concrete painted “SW 2006 Mocking Bird” Spec clause 2.05H indicated sandblast for “an exposed integral colored finish” Please clarify the required finish and color (white or grey cement?) for precast concrete spandrels and column cap.

Response: All the precast concrete spandrels are to be integral colored finish per specifications. Color to be matched to the paint color shown on the finish schedule on the drawing. The precast column capitals are not to be sandblasted. All other precast is to have a sandblasted finish.

30. Precast Concrete Spandrels (Sealant): Drawing Reference A9.4, detail 18; A8.1, detail 3:

Question – A9.4, detail 18 shows sealant at top of PC panel to CIP column joint. A8.1, detail 3 states “No sealant or framing” at gridline A/2.5. Please clarify the PC panel joint sealant requirements for the job.


Page 9 of 15

Response: Detail 18/A9.4 which requires sealant between PC panel and CIP column applies only to the locations where the telecom or wireless antennae rooms are located such as gridlines 1 & A and 22 & A.5.

31. Precast Concrete Cap (Cap Dimensions) – Drawing Reference A9.3, details 10 & 16: Detail 10

shows min. panel thickness 4”, and rib thickness 7”. Detail 16 shows minimum panel thickness 6” and rib thickness 8”. Which detail is correct?

Response: Min. panel thickness is to be 4” and rib thickness to be 7” as shown on the detail 10/A9.3.

32. Per sheet E0.3, switchboard MSB appears to be located on the exterior wall of the building.

Electrical Room Enlarged Detail shows MSB in the main electrical room. Which location is correct? If located on the exterior, please confirm MSB should be nema-3R.

Response: The final location of “MSB” shall be on the exterior southwest corner of the parking structure. “MSB” is not in the electrical room. “MSB” shall be in NEMA 3R enclosure.

33. No details are shown on drawings for sign type's S3, S4, and S7. Please clarify.

Response: Locations called out as S3 are changed to S1 (1-030, 1-050, 1-060). Locations called out as S4 are changed to S2 (1-031, 1-051, 1-061). Location 5-020 called out as S7 is changed to S8 with text “METROLINK”. Location 5-021 text is changed to “TUSTIN STATION” and Sign Type S12 (15” high illuminated letters similar to Sign Type S6.

34. Sign schedule states sign type S2 reads: "EXIT ONLY DO NOT ENTER (symbol) however

drawings show it reading "DO NOT ENTER". Please confirm which is correct.

Response: Text is “DO NOT ENTER" only. 35. Please confirm the sign schedule location 026 on G1.1 is to read "PEDESTRIAN ENTRANCE"

as shown on detail 8/G2.2.

Response: Yes. 36. No drawing is shown for sign type X9. Please clarify.

Response: Please refer to 9/G2.1. 37. Will it be acceptable for sign types S1, S2 & S5 to be uniformly 3” deep? It will be much more

costly to have a step down from 3” to 2” in the return depth of the letter.

Response: Please price notched as specified. 38. Spec. 02070-6 1.04C says “See Section 01576-6”, however Section 01576 is not listed in the

Table of Contents. Addendum #3 Item #1 adds text to 02070-6 1.04C. Should the previous text be omitted?

Response: Remove the text “See Section 01576-6” from Spec. 02070-6 1.04C.


Page 10 of 15

39. Spec. 01360-1 1.01C seeks to provide vibration monitoring, however items 1-4 all say “Building

name and address – add by bid time”. Will the buildings to be monitored be identified or are the correct locations shown on page 9? Please advise.

Response: See diagram on 01360-9 for locations where vibration monitoring is required.

40. Addendum #3 Item #8 references Spec. 01325-2.03A, however section 2.03A is not part of spec.

01325. Please clarify where Addendum #3 Item #8 is to be added.

Response: Correct Addendum #3 Item #8 to reference Spec. 01330-2.03A, not 01325.

41. [03400 Precast Concrete] On sheet A9.2, detail 4 & 14 it notes “embed plate to be designed by p.c. panel manufacturer” for the canopy beam and tie rod. The p.c. panel manufacturer will be unaware of the design requirements of these two embed plates, therefore is it possible for the steelwork manufacturer to design and provide those requirements to the precaster?

Response: During the shop drawing process, the canopy manufacturer will provide precast design loads for these embeds.

42. [03400 Precast Concrete] Please provide the quantity of embed plates to be installed in the p.c.

panels by the precaster as shown on sheet A9.2, detail 14.

Response: For the purposes of the bid, provide 5 embeds (similar to detail 4/A9.2) per canopy. 43. [03400 Precast Concrete] Please confirm that the 3/4” plate will be field-welded to the embed

plate as shown on sheet A9.2, detail 4

Response: Yes, the plate will be welded to the embed plate. 44. [03400 Precast Concrete] In specification section 03450, 2.05.F.2 it states “locate inserts on

surfaces which will be concealed in the finished installation.” Does this statement infer that the inserts may only be located on the spandrel panel edges adjacent to the columns, or is it acceptable for the inserts to be placed on the back (inside) face of the spandrel if they are patched?

Response: See sheet S10.1 for suggested panel connection locations. It is preferred to conceal spandrel connections behind precast column cover on outside face of column.

45. [Proposed Agreement] In follow up to Question and Answer No. 2 in Addendum No. 2, please

provide further clarification on how the general contractor's level of self performed work is to be measured. Typically, such provisions require a contractor to self-perform a percentage of the overall contract which is a comparison of the contractor's portion of the contract work (which includes labor, as well as material and equipment costs) to the overall contract price. The answer to this question focuses on the contractor's labor costs rather than the actual cost of the work performed even though the specifications say that the contractor "shall perform work equivalent to at least ten percent (10%) of the total construction work at the site...." Since the term "work" normally includes labor, material and equipment costs, the answer to question no. 2 from Addendum No. 2 seems to limit the term "work" to just the labor component. Please confirm if


Page 11 of 15

this provision and answer to Question 2 (Addendum No. 2) was intended to mean (a) Prime Contractor's direct labor costs (thus excluding material and equipment costs) must be 10% of the overall Contract price (which includes labor, material and equipment costs); or (b) Prime Contractor's work (labor, material and equipment) must be 10% of the overall Contract Price.

Response: Note the reference concludes “work at the site; and, perform the work on the site with its own staff.” Description (a) applies the requirement.

46. [Proposed Agreement] Can OCTA clarify that the statement in IFB Para. M (item No. 2 on page

8) does not prohibit first tier subcontractors from subcontracting work to lower tier subcontractors (e.g., second tier subcontractors).

Response: Subcontractors to the Prime may also hire their own subcontractors (2nd tier)

47. [Proposed Agreement] Is the $1,000,000 limits for Builder's Risk Policy intended to cover any

Owner Soft Costs? If so, this will impact pricing of the policy. Therefore, please advise as to the value and categorization of such soft costs.

Response: Owner is also required to have its own risk coverage. The requirement stems from risk that is inherent to the industry.

48. [Proposed Agreement] Please confirm that a Broad Form Additional Insured Endorsement

wherein all the entities listed in Art. 10.B.1 will be included as Additional Insureds.

Response: The Authority requires the coverage. The endorsement form will have to be reviewed by Authorities’’ Risk Manager.

49. Sheet E0.2, Single Line Diagram: Per note 2 and the single line diagram the MSB does not

include an Underground Pull Section (UGPS) or meter sockets. Please confirm the configuration of MSB.

Response: MSB is located on the southwest corner of the parking structure and shall include an Underground Pull Section and meter socket.

50. Sheet E0.2, Single Line Diagram does not show a feeder to Panel A. Is Panel A is to be

reconnected to the new transformer? If so please provide feeder information.

Response: Panel “A” will be re-fed from the existing 120/240v transformer. See plan for new feeder.

51. Sheet E0.2, Fixture Schedule: There are Type B2 Pole Lights shown in the Fixture Schedule.

Please provide location and circuit information as they are not shown elsewhere on the electrical drawings.

Response: Fixture type “B2” are used on the 5th floor parking structure. See sheet E2.5.


Page 12 of 15

52. Sheet PV E0.3-ALT, Site Electrical Plan: There are (2) 3” conduits shown going from the new SCE transformer to MSB in the Electrical Room. Note that SCE requirements do not allow for more than 5' of conduit inside building. Please verify that this configuration has been approved in advance by SCE.

Response: The feeder to “MSB” stubs up to the UGPS on the southwest corner of the parking structure. There is an underground conduit from “MSB” to the 150KVA transformer that stub-up in the electrical room.

53. Sheet E5.1, Site Electrical Demolition Plan: Note 3 says to reconnect the existing Panel A to the

new transformer and to see the Single Line Diagram for the new feeder.

Response: See Panel “A” & Panel “B” single line diagram on sheet E5.1. 54. Only (2) Type E Exit Fixtures are shown only on the first level. Are Type E Exit Fixtures

required on the other levels? If so please provide locations and circuit information.

Response: Provide exit signs on each floor of parking structure at both stair cases. 55. Sheet C-4, Demolition Plan: At what depth is the existing 30” gas line? Specification Section

16010, Part 1, Paragraph 1.01 A. 8 states that conduit is to run below gas lines with no exceptions. New feeder to Panel A, site lighting and security will require crossing the 30” gas line.

Response: Existing pothole information obtained by the City near the existing platform places the top of the existing 30” SCG gas line at elevation 52.0 and the existing 18-inch RCP storm drain line for the northern catch basin was designed by the City to cross over the existing 30” SCG gas line having a pipe invert elevation of approximately 54.0. No other information is available on the existing facility The spec section that required conduit to run below gas lines has been removed.

56. Sheets E2.2, E2.3, E2.4 and E2.5 all show conduit for Blue Light Emergency Phones. There are

details on Sheet T3.0 showing (3) different Blue Light Emergency Phones. Please identify which phones are to be used at each location. Also, is there a Blue Light Emergency Phone required at the southwest corner of level 5? If so please provide location and circuit requirements.

Response: Blue Light Emergency Phones are indicated on the T series drawings. Notes on these drawings define what type of phone goes where. T2.5 shows 5th floor locations of phones at 2 locations.

57. Per Note 8 on Sheet P2.1, a storm drain line is to connect to a “Sump Pump” near gridlines B/13. However, there is no information regarding this sump pump in the other plans or specifications. Please provide direction if a sump pump is required.

Response: Sump Pump was removed. Run a 4” SD line to outside of structure. Provide back water valve and connect to 12” SD.


Page 13 of 15

58. Detail 21/C-8 calls for the pedestrian pavers and sand bed above 4” aggregate base. However, spec section 02784 2.02 B calls for a minimum of 8” aggregate base. Please clarify.

Response: Specification Section 02784 2.02 B to be deleted. Aggregate base thickness under pavers shall comply with detail in the plans.

59. Architectural Sheet A1.1 call for a guardrail at the middle median at the bus turnaround area.

However, this guardrail is not shown on the Civil plans. Please advise.

Response: Guardrails at the medians are to be installed per sheet A1.1 and detail 1/A7.1. 60. Per Sheet C-18, an existing 8” water line is shown to be vacated within the parking garage

footprint. Please confirm if this is an ACP (Asbestos Concrete Pipe), as no information is provided regarding removal/ abatement of asbestos. Will the Owner be responsible for the abatement costs if required?

Response: 8” ACP – Contractor will be responsible for all demolition costs for the existing water line to satisfy IRWD requirements.

61. The Civil plans reference the City of Tustin Standard Details for sidewalks, curbs and gutters.

The City standard does not indicate requirements for reinforcement or required base. Please confirm no reinforcing or aggregate base is required.

Response: City standard does not require reinforcement or base material under concrete sidewalk.

62. City of Tustin standard Detail 26 for the trash enclosure does not indicate the finish for the metal

gates or plaster color. Please advise.

Response: The standard city detail included in the civil drawings indicates a skim coat and a paint color will be selected in the submittal process. The metal gates will be powder coated. Embeds and any other steel connections that are not a visible part of the gates to be galvanized. Color of powder coat will be provided in the submittal process.

63. Civil Demolition Plan Sheet C-5 identifies an “existing 3 inch electrical conduit. The Civil Sheet

C-10 identifies this line to be “protected until relocated as shown.” Electrical Site Plan, Sheet E0.3 does not indicate any relocation for this line. Please verify the extent of this line and any relocation necessary. Upon relocation does the existing line need to be removed, or can it be abandoned in place?

Response: Per Sheet E5.1, (E) 3” feeder to Panel “A” can be abandoned in place after new feeder is in place and re-connected to Panel “A”. See sheet E0.3 for new feeder routing.

64. Civil Demolition Plan Sheet C-5 identifies an “existing 4 inch telephone conduit. The Civil Sheet

C-10 identifies this line to be “protected until relocated as shown.” Electrical Site Demolition Plan, Sheet E5.1 also identifies this line to be relocated and refers to Sheet T1.1. However, T1.1


Page 14 of 15

does not identify this line. Please verify the extent of the existing 4” telephone line relocation. As well, upon relocation does the existing line need to be removed, or can it be abandoned in place?

Response: See revised Sheet T1.1 which shows new conduit for Telephone cable. Path marked “possible existing path will be part of demolition after cutover to new telco cable.

65. Sheet T1.1 indicates a “possible existing path”, which is not identified on the Civil Plans. Please

verify what this line is (conduit/cabling, etc) and the extent of any relocation necessary. Upon relocation does the existing line need to be removed, or can it be abandoned in place?

Response: See revised Sheet T1.1 which shows new conduit for Telephone cable. Path marked “possible existing path will be part of demolition after cutover to new telco cable.

66. Per the SCRRA General Safety Regulations for Third Party Construction, Section E No. 11,

states…”Work is not allowed within 50 feet of the track centerline while the trains are passing the work site”. Per the civil plans, some of the north side site work will be within 50ft. of the centerline of the Main track No.2. While No. 14 states…”Equipment must be stopped while train is passing through your work limits.” a) what is the “work limits” defined as for this project? b) Please advise if the work stoppage during passing train will apply to the project?

Response: The limits of work as they relate to SCRRA requirements are shown on the demolition plans Sheet C-4 & C-5. Any work that is within 50’ of center line of the closest rail will have to allow for one of the following: 1. A physical barrier consisting of a k-rail and a fence on top as shown in the attached

drawing must be placed at the edge of the construction site 2. OR a flagger must be present if contractors work encroaches into the 50 feet limit. All contractor’s work requiring large equipment within the 50’ must be done during certain work windows coordinated with SCRRA or at night time. Attachments

1. Specification Section 02722 – Stormwater Filtration System : Added 2. Sheet C-4 : Revised 3. Sheet C-6 : Revised 4. Sheet C-9 : Revised 5. Sheet C-10 : Revised 6. Sheet C-11 : Revised 7. Sheet C-14 : Revised 8. Sheet C-15 : Revised 9. Sheet E0.2 : Revised 10. Sheet E0.3 : Revised 11. Sheet E2.1 : Revised 12. Sheet E2.2 : Revised 13. Sheet E2.3 : Revised 14. Sheet E2.4 : Revised 15. Sheet E2.5 : Revised 16. Sheet E3.3 : Revised 17. Sheet E3.5 : Revised


Page 15 of 15

18. Sheet E5.1 : Revised 19. Sheet ELC5 : Revised 20. Sheet P2.1 : Revised 21. Sheet T1.1 : Revised

Section 02722 – STORMWATER FILTRATION SYSTEM

Page 1 of 9

Section 02722 - STORMWATER FILTRATION SYSTEM

PART 1 — GENERAL

1.1 Related Requirements

A. Section 01330 – Submittals: Shop Drawings, Product Data, and Samples

B. Section 02300 – Earthwork: Excavation, Trenching, Backfill, and Compaction.

C. Section 02370 – Erosion and Sedimentation Control (Including SWPPP)

1.2 Summary

A. This section includes a radial cartridge stormwater media filters.

1.3 Reference Standards

A. American Association of State Highway and Transportation Officials (AASHTO)

a. AASHTO M105 – Gray Iron Castings

B. American Society for Testing and Materials (ASTM)

a. ASTM A48, CL.30B – Gray Iron Castings

b. ASTM A82 – Steel Wire, Plain, for Concrete Reinforcement

c. ASTM A185 – Steel Welded Wire Reinforcement, Plain for Concrete

d. ASTM A496 – Steel Wire, Deformed, for Concrete Reinforcement

e. ASTM A497 – Steel Welded Wire Reinforcement, Deformed for Concrete

f. ASTM A615 – Deformed & Plain, Carbon-Steel Bars for Concrete Reinforcement

g. ASTM B209 – Aluminum & Aluminum Alloy Sheet and Plate

h. ASTM C32 – Sewer and Manhole Brick (Made form Clay or Shale)

i. ASTM C139 – Concrete Masonry Units for Construction of Catch Basins and Manholes

j. ASTM C150 – Portland Cement

k. ASTM C478 – Precast Reinforced Concrete Manhole Sections

l. ASTM C595 – Blended Hydraulic Cement

m. ASTM C857 – Minimum Structural Design Loading for Underground Precast Concrete Utility Structures


Page 2 of 9

n. ASTM C858 – Underground Precast Concrete Utility Structures

o. ASTM C891 – Installation of Underground Precast Utility Structures

p. ASTM C990 – Joints for Concrete Pipe, Manholes, and Precast Box Sections Using Preformed Flexible Joint Sealants

q. ASTM C1107 – Packaged Dry, Hydraulic Cement Grout (Non-Shrink)

r. ASTM D698 – Test Methods for Laboratory Compaction Characteristics of Soil Using Standard Effort

1.4 Definitions

A. BMP: Best Management Practices

B. TSS: Total Suspended Solids

1.5 Submittals

The following shall be submitted by contractor in accordance with Section 01330 Submittal Procedures:

A. Product Data for the following:

a. Radial Cartridge Stormwater Media Filter

1. Product specifications to include but not limited to specification sheets, brochures, and performance claims.

2. Installation procedures.

3. Shop Drawings shall be provided to include details for fabrication, construction, reinforcement, joints, assembly, and any accessory items. Shop drawings shall be annotated to indicate all materials to be used and applicable material standards, required tests of materials, and all design assumptions for structural analysis.

4. Operation & Maintenance Manual.

B. Independent third party certification or test report demonstrating conformance to applicable local or regional BMP standards before the treatment system is installed for the following:

1. Removal Efficiency

2. Targeted Pollutants of Concern

3. Hydraulic Capacity

4. Certification of adherence to applicable standard

C. Products submitted as approved equal must be submitted at least two weeks prior to project bid opening and must be approved by project Engineer. Submittal for approved


Page 3 of 9

equal product must contain a signed letter from an executive officer of the manufacturer stating product is equivalent to all applicable requirements of this specification.

1.6 Delivery, Storage, and Handling

A. All filtration system components shall be delivered to the site and unloaded with handling that conforms to the manufacturer’s instructions for reasonable care. Concrete and internal components shall not be rolled or dragged over gravel or rock during handling. The Contractor shall take necessary precautions to ensure the method used in lifting or placing the filtration system does not induce stress fatigue in the concrete.

PART 2 — PRODUCTS

2.1 Radial Cartridge Stormwater Media Filter

2.1.1 Description

The Contractor, and/or a manufacturer selected by the Contractor and approved by the Engineer, shall furnish all labor, materials, equipment and incidentals required and install all precast concrete stormwater filtration systems and appurtenances in accordance with the Drawings and these specifications. The stormwater filtration system shall consist of an underground precast concrete structure that houses rechargeable, passive, orifice controlled, radial-flow media-filled filter cartridges which trap particulates (TSS) and adsorb pollutants such as dissolved metals, nutrients, and hydrocarbons. The Stormwater Filtration System shall be sized at a hydraulic loading rate of no more than 2.0gpm/sf of media surface area. The water quality treatment flow rate shall be as determined and approved by the Engineer. The Stormwater Filtration System shall contain a pre-treatment bay and be self-draining to increase the effective life of the filter media. The media cartridges shall be elevated to reduce the accumulation of material on the cartridge surface. Each radial-flow filter cartridge shall operate at a pre-determined flow rate through the use of an integrated flow control mechanism located within each filter cartridge. The filtration system must include the capability to partition flows, causing all runoff to be diverted into the filtration chamber during low-flow conditions. This can be accomplished with either internal or external diversion. Flows exceeding the treatment capacity of the unit shall be diverted around the filtration chamber to prevent re-suspension and washout of previously trapped pollutants. The Contractor shall furnish and install the Stormwater Filtration System complete and operable as shown and as specified herein in accordance with the requirements of the plans and contract documents.

2.1.2 Materials and Design

A. Concrete for precast stormwater filtration systems shall conform to ASTM C478, C857 and C858 and meet the following additional requirements:


Page 4 of 9

1. In all cases the wall thickness shall be no less than the minimum thickness necessary to sustain HS20-44 (MS18) loading requirements as determined by a Licensed Professional Engineer.

2. Sections shall have tongue and groove or ship-lap joints with a butyl mastic sealant conforming to ASTM C 990.

3. Cement shall be Type V Portland cement conforming to ASTM C 150.

4. All sections shall be cured by an approved method. Sections shall not be

shipped until the concrete has attained a compressive strength of 4,000 psi (28 MPa) or other designate suitable handling strength.

5. Pipe openings shall be sized to accept pipes of the specified size(s) and

material(s), and shall be sealed by the Contractor with hydraulic cement conforming to ASTM C 595M or ASTM C1107.

6. Aggregates shall conform to ASTM C33, except that the requirement for

gradation shall not apply.

7. Reinforcement shall consist of wire conforming to ASTM A82 or A496, of wire mesh conforming to ASTM A185 or A497, or Grade 40 steel bars conforming to ASTM A615.

8. Castings for manhole frames and covers shall be in accordance with

ASTM A48, CL.30B and AASHTO M105. The access cover/s shall be designed for HS20-44 traffic loading and shall provide a minimum of 30-inch clear opening.

9. Brick or masonry used to build the manhole frame to grade shall conform

to ASTM C32 or ASTM C139 and shall be installed in conformance with all local requirements.

10. Diversion weirs, separation chamber, and oil baffle shall be made from

concrete, marine grade fiberglass and/or stainless steel and shall conform to ASTM A240

11. All mounting hardware for internal components shall be made of 304SS

and shall conform to ASTM A240

B. All internal components including stainless steel bypass manifold, pre-treatment filter, filter cartridge(s), filter media (as specified on the plans or by the Engineer), and shall be provided by the manufacturer.

1. The bypass manifold shall be fabricated of stainless steel, minimum Type 304, complying with the requirements of ASTM A240.

2. Filter cartridge bottom pan, inner ring, top and hood shall be constructed from high density polyethylene (HDPE). Filter cartridge screen shall consist of 1” X ½” welded wire fabric (16 gauge minimum) with a bonded PVC coating. An orifice mechanism plate shall be supplied with each cartridge to restrict flow rate to a maximum of 12 gpm (12-inch cartridge), 18 gpm (18-inch cartridge), 24 gpm (24-inch cartridge), 30 gpm (30-inch cartridge) at system design head or as specified on drawings.


Page 5 of 9

3. The filter media shall consist of one or more of the following:

a. Perlite Media: Perlite media shall be made of natural siliceous volcanic rock free of any debris or foreign matter. The perlite media shall have a bulk density ranging from 6.5 to 8.5 lb/ft3 and particle sizes ranging from that passing through a 0.50 inch screen and retained on a U.S. Standard #8 sieve.

b. Zeolite Media: Zeolite media shall be made of naturally occurring clinoptilolite, which has a geological structure of potassium-calcium-sodium aluminosilicate. The zeolite media shall have a bulk density ranging from 44 to 48 lb/ft3, particle sizes ranging from that passing through a U.S. Standard #4 sieve to that retained on a U.S. Standard #6 sieve, and a cation exchange capacity ranging from 1.0 to 2.2 meq/g.

c. Zeolite-Perlite (ZP): ZP is a mixed media that shall be composed of a blend of Zeolite (see above) and Perlite (see above).

2.1.3 Performance

A. Each specified flow based Stormwater Filtration system shall be capable of removing 80% of the net annual Total Suspended Solids (TSS) load based on a d50 particle size of 20 microns. Annual TSS removal efficiency models shall be based on laboratory and field performance data, site-specific hydraulics and hydrology, and local rainfall intensity distributions. Filtration units shall have the ability of being placed inline without re-suspending trapped sediments or re-entrain contaminants up to and including the Peak Flow Rate. B. Each Stormwater Filtration System shall contain one or more media cartridges that maintain a uniform pressure profile across the face of the filter during operation. At the design flow rate the maximum filter hydraulic loading rate is not to exceed 2.0gpm/sf of filter surface area. Stormwater shall enter the filter cartridges through the sides and shall flow through the filter media radially from the outer perimeter inward and shall have an average media contact time of not less than 39 seconds. C. The Stormwater Filtration System performance shall be third partied verified and shall be based on lab and field performance. The Stormwater Filtration System shall have Washington Department of Ecology General Use Level Designation (GULD). D. The Stormwater Filtration System shall be supplied with either internal or external bypass with a minimum capacity not less than the peak design storm as determined by the Engineer.

2.1.4 Quality Assurance

The materials, process and finished stormwater filtration system shall be subject to inspection by the Engineer. Acceptance or rejection of the system shall be based on the Specifications contained in this section. Imperfections may be repaired but subject to the acceptance of the Engineer.


Page 6 of 9

2.1.5 Manufacturer

Each stormwater filtration system shall be a FloGard Perk Filter as manufactured by Kristar Enterprises, Inc, 360 Sutton Place, Santa Rosa, California 95407. Phone: (800) 579-8819

PART 3 — Execution

3.1 Earthwork

A. Excavation, trenching, and backfilling shall be as specified in Division 2 Section “Earthwork.”

3.2 Identification

A. All Stormwater Filtration devices shall be identified at the surface level with markings indicating that they are treatment devices.

3.3 Inspection

3.3.1 General

A. Concrete, internals, and accessories, shall be inspected prior to installation and any defective or damaged product shall be replaced.

3.3.2 Manhole Sections

A. Any manhole section with chipped bells or spigots shall be rejected and replaced.

B. Any section with a fracture or crack greater than 0.10 in. in length or 0.01 in width shall be rejected and replaced.

C. Any manhole section that has not had at least seven (7) days cure time (including 12 hours steam cure, or 21 days without steam cure) or is out of round shall be rejected and replaced.

D. Any section with indications of imperfections in mixing and/or molding, honeycombed, or open textured surface, shall be rejected and replaced.

E. Any section with indications of patches or repairs shall be rejected and replaced.

F. Any section with exposed reinforcing steel shall be rejected and replaced.

3.4 Structure Installation

3.4.1 General

A. General Locations and Arrangements: Drawing plans and details indicate general location and arrangement of underground storm and drainage piping systems. Location and arrangement of stormwater filtration systems is critical and design consideration should be taken into account. Install filtration system as indicated herein and as directed by the product manufacturer, to the maximum extent practical. Where specific installation procedure is not indicated, follow product manufacturer’s written instructions.


Page 7 of 9

B. All products shall be inspected for defects and cracks before being lowered into the trench, piece by piece. Any defective, damaged or unsound structure or any product that has had its grade disturbed after laying, shall be taken up and replaced. Open ends shall be protected with a pipe plug to prevent earth or other material from entering the filtration system during construction. The interior of the filtration system shall be free from dirt, excess water and other foreign materials as the installation progresses and left clean at the completion of the installation.

3.4.2 Trench Excavation

3.4.2.1 Excavation

A. Excavate trenches to ensure that sides will be stable under all working conditions. Slope trench walls or provide supports in conformance with all local and national standards for safety. Open only as much trench as can be safely maintained by available equipment. Backfill all trenches as soon as practicable, but not later than the end of each working day.

B. Where trench walls are stable or supported, provide a width sufficient, but no greater than necessary, to ensure working room to properly and safely place and compact haunching and other embedment materials. The space between the filtration system and trench wall must be wider than the compaction equipment used in the compaction zone.

C. When supports such as trench sheeting, trench jacks, trench shields or boxes are used, ensure that support of the filtration system and its embedment is maintained throughout installation. Ensure that sheeting is sufficiently tight to prevent washing out of the trench wall from behind the sheeting. Provide tight support of trench walls below viaducts, existing utilities, or other obstructions that restrict driving of sheeting.

3.4.2.2 Dewatering

A. Do not lay or embed any section of the Stormwater Filtration system in standing or running water. At all times prevent runoff and surface water from entering the trench.

B. When water is present in the work area, dewater to maintain stability of in-situ and imported materials. Maintain water level below pipe bedding and foundation to provide a stable trench bottom. Use, as appropriate, sump pumps, well points, deep wells, geofabrics, perforated underdrains, or stone blankets of sufficient thickness to remove and control water in the trench. When excavating while depressing ground water, ensure the ground water is below the bottom of cut at all times to prevent washout from behind sheeting or sloughing of exposed trench walls. Maintain control of water in the trench before, during, and after pipe system installation and until embedment is installed and sufficient backfill has been placed to prevent flotation of the pipe, fitting, or drainage structures. To preclude loss of soil support, employ dewatering methods that minimize removal of fines and the creation of voids in in-situ materials.

3.4.2.3 Removal of Rock

A. Rock in either ledge or boulder formation shall be replaced with suitable materials to provide a compacted earth cushion having a thickness between exposed rock and the manhole sections of at least 12 inches (0.3m).


Page 8 of 9

3.4.2.4 Removal of Unstable Material

A. Where wet or otherwise unstable soil incapable of properly supporting the manhole structure, as determined by the Engineer, is encountered in the bottom of a trench, such material shall be removed to at least 24 inches below bottom of the structure and replaced to the proper grade with select granular material, compacted as directed by the engineer. When removal of unstable material is due to the fault or neglect of the Contractor while performing shoring and sheeting, water removal, or other specified requirements, such removal and replacement shall be performed at no additional cost to the Owner.

3.4.3 Bedding

A. A stable and uniform bedding shall be provided for the manhole structure and any protruding features of its joint and/or fittings. The bedding shall be compacted to a minimum of 90% of maximum density per AASHTO T99, or as shown in the plans. Structure bedding shall be a minimum of 6” in thickness. The bedding surface for the structure shall provide a firm foundation of uniform density throughout the entire length of the pipe.

3.4.4 Setting Structures

A. Each structure section shall be thoroughly examined before being placed; defective or damaged sections shall not be used. Structures shall be placed to the elevations as indicated on the plans. Proper facilities shall be provided for lowering structure sections into trenches. Sections shall not be laid in water, and the sections shall not be laid when trench conditions or weather are unsuitable for such work. Diversion of drainage or dewatering of trenches shall be provided as directed by the engineer; see dewatering section.

3.4.5 Jointing

A. Joints shall be constructed as described herein and in accordance with manufacturer’s installation instructions.

B. All Bell-and-Spigot manhole joints shall be thoroughly cleaned. The supplied gasket shall be installed on the spigot end with the angled surface facing toward the mating surface. Joint lubricant, supplied by the manufacturer, shall be liberally applied to entire interior of bell and gasket on spigot prior to assembly. Sections shall be mated with sections level and plumb to prevent rolling the gasket.

C. All Tongue-and-Groove joints shall be thoroughly cleaned. Sections shall be mated and Hydraulic Cement Grout (Non-Shrink) complying with ASTM C1107 shall be applied liberally to the exterior and exterior of the joint ensuring all voids are filled completely.

3.4.6 Backfilling

3.4.6.1 General

Backfill placement and compaction shall be constructed in accordance with the specifications herein and the product manufacturer’s published installation guides.


Page 9 of 9

3.4.6.2 Backfilling Manhole Sections in Trenches

After the manhole sections and connecting pipes have been properly bedded, selected material from excavation or borrow, at a moisture content that will facilitate compaction, shall be placed along all sides of pipe in layer depths to ensure minimum compaction density is obtained evenly throughout the backfill material. The backfill shall be brought up evenly on all sides of the structure. Each layer shall be thoroughly compacted with mechanical tampers or rammers. Tests for density shall be made as necessary to ensure conformance to the compaction requirements specified below. Where it is necessary, in the opinion of the Engineer, that sheeting or portions of bracing used be left in place, the contract will be adjusted accordingly. Untreated sheeting shall not be left in place beneath structures or pavements.

3.4.6.3 Movement of Construction Machinery

Movement of construction machinery over a manhole structure at any stage of construction shall be at the Contractor's risk. Any damaged structure shall be repaired or replaced.

END OF SECTION

CBARRIER/FENCE

4’-

0"

2’-

8"

6’-

8"

CONTRACTORS

WORK AREA

4’-0" HIGH CHAIN

LINK FENCE

2:1

TRACKC CBARRIER/FENCECONTRACTORS

WORK AREA

TYPICAL ROADBED SECTION

FILL SECTION

CUT SECTION

TEMPORARY BARRIER

TYPE "K" (TYP)

50’-0" MIN.

NATURALGROUND

NATURALGROUND

3:1

2:1 2:1

2:12:1

(WHICHEVER IS GREATER)

50’-0" MIN. OR TOE OF SLOPE

Documents

August 31, 2001rcconstructionservices.com/Bid Board/Tustin Metrolink Parking Struc… · 16010-Part 1, Paragraph 1.01 A.8. –removed requirement for conduit to run below gas line