PPI_Responses_11_Oct_2018.pdf

N69450-15-R-1090 Pre Proposal Inquiry (PPI) LOG

The PPI log is for informational purposes only. It does not amend the RFP. If a revision to the RFP is required, a formal amendment will be issued.

PPI # RFP Section Paragraph Number Page Number Drawing Number Question Government Response RFP / Solicitation Attachment

Provided Yes or No ACQ Amend

1 26 42 13.00 20 3.1.7.1.c

SECTION 26 42

13.00 20 Page 11

Please clarify sentence below from the CATHODIC PROTECTION section of the specs. The DI pipe manufacturer recommends one joint bond be placed on the bell portion on the pipe to prevent damage to special lining such as ceramic epoxy lining specified in the piping schedule. To prevent damage of the lining on the plain end of the pipe from the joint bonds, the DI pipe manufacturer recommends welded a heat sink plate on the plain end which prevents damage to the interior lining. Will you consider adding this requirement by addendum to the spec to make sure all bids are similar?

SECTION 26 42 13.00 20 Page 11, 3.1.7.1.c, “On pipe and fittings with dielectric linings, make weld connection on shop tab provided or on a thick metal section to minimize damage to lining and coating. After weld is made, coat weld with coating repair material.”

Changes to the specification will not be made.

Method of protection of lining is up to each contractor and describing how to protect the lining may limit the available manufacturers.

No 0002

2 40 05 13 2.2.2

SECTION 40 05 13

Please clarify restraint for buried DI piping. The spec below requires all buried DI piping to be restrained. Some lines on the YARD PIPING drawings show restrained joint limits and some lines show nothing. Am I correct in assuming lines that have no limits shown are fully restrained and lines with RJ limits are only restrained within the limits?

SECTION 40 05 13 Page 10, 2.2.2 Ductile Iron Joints Joints shall have a working pressure rating for liquids equal to the pressure rating of the connected pipe. Dielectric fittings or isolation joints shall be provided between all dissimilar metals. All buried piping joints shall be restrained unless otherwise noted.

All buried piping shall be restrained per Specifications and General Yard Piping and Utilities Note 11. The only exception is the new 8"-W1-PVC(C900) pipe that comes from off of the plant site. The restrained joint distances for that pipe are shown on the drawings.

No 0002

3 40 05 13

2.2.2.2 Restrained

Joints

SECTION 40 05 13

Are MJ wedge action restraints such as Megalug allowed for use on DI MJ fittings to provide restraint?

Yes, as long as the product meets the specification criteiria.

No 0002

5 09 96 00

f. System No. HP-7 Concrete Encased

Metal

SECTION 09 96 00

Per SECTION 09 96 00 Page 14, System No. HP-7 Concrete Encased Metal, requires wall pipes to be coated with 16 mils of coal tar epoxy. Does all concrete encased metel piping require 16 mils of coal tar epoxy or can the wall pipe be provided with a shop primer and field coated with a coal tar epoxy at the jobsite?

Yes, all concrete encased metal piping requires the specificed 16 mils of coal tar epoxy. The contractor may apply one coat of shop primer and one coat of field coated coal tar epoxy provided the same surface preparation is used, the total mils meets the specification and primer and coal tar epoxy product are compatible.

No 0002

EC05-101,

General Sheet Note 2

General Sheet Note 2 on sheet EC05-101 requires insulating joints at all connections to existing pipe and pipe at structures. Will an insulated coupling be allowed for connections to existing pipe? Does all DI buried piping require a buried insulating flange joint before connectiong to the wall pipe at the structure?

Requirements are set forth in Section 26 42 13.00 20 Paragraphs 2.9 (in accordance with AWWA C110), 2.10, 3.1.3 and 3.1.4 as well as shown on Detail C1 and C2 on E-99-814.

No 0002

8 40 05 13

2.3.3.3 Flanged

Fittings

SECTION 40 05 13

Are buried flange bolts for DI pipe required to be 316SS?

DI buried flange bolts are not required to be 316SS.

See Section 40 05 13 Paragraph 2.3.3.3.

No 0002

Section 00100 Bidding

Schedule/Instructions to Bidders

2 5 of 56

The instructions state "Offerors must submit the Attached AMAG form (NAS Jacksonville base access form) for hand delivery. This form must be submitted at least 2 business days in advance of the proposal receipt date". The form is not attached to the documents. How do we obtain the form?

AMAG Form (NAS Jacksonville base access form) is fortcomming.

YES 0001

The PPI log is for informational purposes only. It does not amend the RFP. If a revision to the RFP is required, a formal amendment will be issued.

PPI # RFP Section Paragraph Number Page Number Drawing Number Question Government Response RFP / Solicitation Attachment

Provided Yes or No ACQ Amend

12 40 05 13 PIPING SCHEDULE PIPING SCHEDULE

The piping schedule in spec 40 05 13 lists coating HP-8 for buried DI piping. Spec section 09 96 00 calls for C210 epoxy or C213 epoxy. Buried DI is usually coated with a 1 mil bituminous coating. Epoxy coatings are an additional charge. Will you require all buried DI to be epoxy coated or will you change the piping schedule for buried DI from HP-8 to BITUM to indicate bituminous coating for buried DI?

The specification is correct for the use of cold tar epoxy coating on burried DI piping. Corrosion is a concern for plant staff and the coal tar epoxy provides an additional level of protection for the saline environment.

N/A 0002

14 Can another site visit be held? And will the bid opening be extended past Oct 4? An additional site visit will not be provided at this time No 0002

15 N/A N/A N/A D-99-801, detail B3 ON plan sheet D-99-801, detail B3, Notes for Fabricated Slide Gates #2, states to See Slide Gate Schedule. We can not locate the Slide Gate Schedule. Please provide.

Slide gates 11RS-SLG11011, 11RS-SLG11012, 11RS- SLG-11001, 11RS-SLG-11002, and 11RS-SLG-11003 shall be Style 1 per sheet D-99-801, Detail B3, aluminum materials, with design seating head of 5 feet water column in a seating condition. All slide gates shall be motor actuated equipped with a manual handwheel for manual operation as shown on sheet D- 99-801. Soft goods and hardware shall be as per specification 35 20 16.53.

No 0002

17 35 20 16.53 N/A N/A N/A Specification section 35 20 16.53 references wheel gates. We can not locate wheel gates on the drawings. Please advise if wheel gates are required on this project.

Wheel gates are not required on this project. No 0002

18 35 20 16.53 N/A N/A N/A Specification section 35 20 16.53 references tractor gates. We can not locate tractor gates on the drawings. Please advise if wheel gates are required on this project.

Tractor gates are not required on this project. No 0002

19 43 32 69 N/A N/A N/A Who is responible to pay for chemcials required for testing?

Contractor is required to provide all chemicals required for testing.

No 0002

20 33 16 13.16 2.7 6 N/A Are stairs and handrail required at the industrial storage tank, industrial spill tank, industrial EQ tank, and domestic storage tank? Nothing is shown on the drawings.

There is no requirement for stairs for the industrial tank, industrial spill tank, industrial EQ tank, and domestic storage tank.

No 0002

21 31 23 00.00 20 Part 2 Products N/A GD05-101 General

Sheet Note 11 Can the existing Trickling Filters stone be re-used on site as backfill or fill?

No, test and dispose of rock as directed in General Sheet Note 11.

No 0002

23 N/A N/A N/A N/A Who is responsible to transfer seed sludge to new package plants?

Contractor is responsible for bringing new package plant online which includes transferring seed sludge.

No 0002

26 N/A N/A N/A N/A Who is required to pay for the Government witnessing factory tests?

Costs associated with factory tests are requirements of the RFP and to be paid by the Contractor.

No 0002

27 N/A N/A N/A N/A Please provide as-built drawings of the exisitng wwtp . Available as-builts will be provided upon award No 0002

28 N/A N/A N/A N/A Is the General Contractor required to provide builder's risk insurance? No Builders risk insurance is not required No 0002

29 40 05 13 40 05 13

ATTACHMENT - 1

PIPE SCHEDULE

Please clarify joints listed for buried DI piping. Some lines list MJ and some lines list PRJ. Are buried DI lines listed as MJ required to MJ pipe and MJ fittings? Do lines listed as MJ require restraint? If MJ pipe is required, will Push-on pipe be allowed inlieu on MJ pipe?

In accordance with specification section 40 05 13, estrained MJ or PRJ are acceptable and shall be restrained.

No 0002

31 DP05-103 Are Keynote pipelines 1 and 2 reversed? See photo C1 on D-73-901.

Notes are correct. Note 1 points to cast iron pipe and note 2 points to the pvc pipe behind the cast iron pipe.

No 0002

The PPI log is for informational purposes only. It does not amend the RFP. If a revision to the RFP is required, a formal amendment will be issued.

PPI # RFP Section Paragraph Number Page Number Drawing Number Question Government Response RFP / Solicitation Attachment

Provided Yes or No ACQ Amend

32 D-73-901 Detail C1: 90 bends appear to be long radius. Please confirm.

90 deg. bend shown on dwg D-73-901 is a long radius 90 deg bend.

No 0002

35 Please confirm whether this project will be tax exempt.

This project is not tax exempt. Prime and all subcontractors must pay all appropriate city, county, state and federal taxes.

No 0002

36 Please confirm the retainage to be withheld for this project.

See solicitation clauses: FAR 52.211-12, Liquidated Damages - Construction and FAR 52.232-5, Payments under Fixed-Price Construction Contracts

No 0002

37 Please confirm the warranty time frame for this project. Please see FAR 52.246-21, Warranty of Construction No 0002

38 "0700" 45 Please confirm the minority goal of 41.7 percent will apply to all trades on this project. That is correct. No 0002

S-23-101, S-24-

101, S-25-01, S-30- 101, Please confirm the tank manufacturer may adjust wall penerations locations by +/- 1' to accommodate the floor wall connection and tank prestressing operations for all AWWA D110 structures.

Yes, tank manufacturer may adjust wall penetrations on tanks on S-23-101, S-24-101, S-25-101, and S-30- 101 by +/- 1' in elevation to accommodate wall connections and tank prestressing operations but contractor shall be responsible for all design elements associated with the adjustment.

No 0002

S-23-101, S-24- 101, S-25-01, S-30- 101, General Note

Note 5 states that tank manufacturer shall engage a licensed geotechnical engineer to design the tank foundation based on geotechnical data shown on the drawings. After reviewing the geotechnical data available, it appears the limited informaiton available will introduce significant risk into the bidding process and result in added project costs.

Would it be possible for a basis of bids to be established to reduce risk and ensure all bidders are providing pricing on equal assumptions? Additional geotechnical investigations would be performed (either by contractor or owner) during construction to confirm foundation preparation requirements and any changes from the basis of bid assumption would be handled as an amendment to the contract.

Borings are provided in the design document but since calculations on settlement are particular to each manufacturers proprietary tank design and in order to allow for multiple bids, the settlement calculations are not provided in the design. In accordance with specification section 33 16 13.16 it is the contractors responsibility to perform the settlement calculations in order to determine the extent of soil improvements required.

If additional soil information is required during bidding per the tank locations provided, provide detailed list of what additional information is required.

No 0002

47 40 05 13 2.5.1.2 14 D-73-101

Drawing D-73-101 states to remove all CI pipe and fittings and replace with C900 PVC.

Spec section 40 05 13 ,page 14 ,2.5.1.2, c. States all fittings to be same material as pipe (C900). The drawing shows 6x4 reducing base tees as typical. C900 fittings are not made with bases. Is it the intent of these documents to use DIP 125# flanged base fittings with flange adpters to C900 pipe? also the specs call for push on gasketed fittings for abovegrade installation. Please advise. Is it acceptable to use sch 80 PVC pipe with solvent welded fittings and 150# flanges with 125# flanged DI fittings or solvent welded PVC fittings?

See response for PPI#20 & PPI#21 No 0002

The PPI log is for informational purposes only. It does not amend the RFP. If a revision to the RFP is required, a formal amendment will be issued.

PPI # RFP Section Paragraph Number Page Number Drawing Number Question Government Response RFP / Solicitation Attachment

Provided Yes or No ACQ Amend

48 41 05 13 2.11.2.1 27 D-99-804, D1

Drawing D-99-804 detail D1, calls out "Pipe Flexible expansion Joint". Is this expansion joint to be as specified in section 40 05 13, 2.11.2.1, page 27, a. flanged metallic Piping Systems: Elastomer bellows expansion joint or is the drawing showing something other than what is specified?

Drawing D-99-804 is showing that at tanks pipe connections use a double ball joints.

No 0002

Section 00100 Bidding

Schedule/Instructions to Bidders

2 5 of 56 N/A

The instructions state "Offerors must submit the Attached AMAG form (NAS Jacksonville base access form) for hand delivery. This form must be submitted at least 2 business days in advance of the proposal receipt date". The form is not attached to the documents. How do we obtain the form?

The AMAG form was provided on Amendment 0001 dated 09/24/2018.

YES 0001

50 N/A N/A N/A D-99-801, detail B3 ON plan sheet D-99-801, detail B3, Notes for Fabricated Slide Gates #2, states to See Slide Gate Schedule. We can not locate the Slide Gate Schedule. Please provide.

See response for PPI #15 No 0002

51 35 20 16.53 N/A N/A N/A What Material are the slide gates composed of? See response for PPI #16 No 0002

52 35 20 16.53 N/A N/A N/A Specification section 35 20 16.53 references wheel gates. We can not locate wheel gates on the drawings. Please advise if wheel gates are required on this project.

See response for PPI #17 No 0002

53 35 20 16.53 N/A N/A N/A Specification section 35 20 16.53 references tractor gates. We can not locate tractor gates on the drawings. Please advise if wheel gates are required on this project.

See response for PPI #18 No 0002

54 43 32 69 N/A N/A N/A Who is responible to pay for chemicals required for testing? See response for PPI #19 No 0002

55 33 16 13.16 N/A N/A N/A Are stairs and handrail required at the industrial storage tank, industrial spill tank, industrial EQ tank, and domestic storage tank? Nothing is shown on the drawings.

See response for PPI #20 No 0002

56 31 23 00.00 20 Part 2 Products N/A GD05-101 General

Sheet Note 11 Can the existing Trickling Filters stone be re-used on site as backfill or fill? See response for PPI #21 No 0002

57 N/A N/A N/A C-05-102 Drawing C-05-102, General Sheet Notes #1, states "See Geotechnical Report By Rock Engineering". Please provide Geotechnical Report.

See response for PPI #22 No 0002

58 N/A N/A N/A N/A Who is responsible to transfer seed sludge to new package plants? See response for PPI #23 No 0002

59 N/A N/A N/A GD05-106

Per elevation view it states filter media to remain. After demolition and removal of filter media, is it the intent to utilize the filter media for backfill of the void left from the demolition of the trickling filters?

See response for PPI #24 No 0002

60 N/A N/A N/A N/A What permits are the General Contractor required to pay for? See response for PPI #25 No 0002

61 N/A N/A N/A N/A Who is required to pay for the Government witnessing factory tests? See response for PPI #26 No 0002

62 N/A N/A N/A N/A Please provide as-built drawings of the exisitng wwtp . See response for PPI #27 No 0002

63 N/A N/A N/A N/A Is the General Contractor required to provide builder's risk insurance? See response for PPI #28 No 0002

The PPI log is for informational purposes only. It does not amend the RFP. If a revision to the RFP is required, a formal amendment will be issued.

PPI # RFP Section Paragraph Number Page Number Drawing Number Question Government Response RFP / Solicitation Attachment

Provided Yes or No ACQ Amend

64 40 05 13 2.5.1.2 14 D-73-101

Drawing D-73-101 states to remove all CI pipe and fittings and replace with C900 PVC.

Spec section 40 05 13 ,page 14 ,2.5.1.2, c. States all fittings to be same material as pipe (C900). The drawing shows 6x4 reducing base tees as typical. C900 fittings are not made with bases. Is it the intent of these documents to use DIP 125# flanged base fittings with flange adpters to C900 pipe? also the specs call for push on gasketed fittings for abovegrade installation. Please advise. Is it acceptable to use sch 80 PVC pipe with solvent welded fittings and 150# flanges with 125# flanged DI fittings or solvent welded PVC fittings?

See response for PPI#20 & PPI#21 No 0002

65 41 05 13 2.11.2.1 27 D-99-804, D1

Drawing D-99-804 detail D1, calls out "Pipe Flexible expansion Joint". Is this expansion joint to be as specified in section 40 05 13, 2.11.2.1, page 27, a. flanged metallic Piping Systems: Elastomer bellows expansion joint or is the drawing showing something other than what is specified?

See response for PPI #48 No 0002

67 N/A N/A N/A DI00-701

I see that we are supposed to provide a 95LCP01 but I do not see any IO for it on the I/O list or P&ID drawing. Please provide I/O points if needed.

There is one analog signal linked to the remote I/O station at 95LCP01. Drawings DI00-701 and DI00- 702 indicate the signal to be provided for the pH transmitter replacement at PS 1839.

No 0002

Amendment 0001, Could you clarify the bid due time?

Can we submit electronic proposals?

Per Amendment 0001, proposal due has been extended to 18 Oct 2018 at 3 PM Eastern Time.

Proposal may not be submitted electronically.

No 0002

70 N/A N/A N/A D-14-101 Who is responsible for supplying the trash bin dumpster? Prime contractor is responsible for this. No 0002

71 N/A N/A N/A D-14-101 If the contractor is responsible for supplying the trash bin dumpster, please provide a specification.

Contractor is responsible for dumpster as per specification 46 23 00, Section 2.6.7, Sheet 13

No 0002

72 N/A N/A N/A N/A What is the frequency that sludge is sent to the sludge drying beds?

Frequency varies depending on amount of sludge produced. Generally no more than 10 times per day.

No 0002

73 N/A N/A N/A N/A Please provide inverts for all existing underground piping. Without this information we can not locate potential conflicts between new and old underground utilities.

Per General Yard Piping and Utilies Note 1 on Drawing C-00-001, the Contractor shall field verify depth and location of all existing utilities prior to excavation.

No 0002

75 01 14 00.00 1.2.a.6 2 N/A Specification section 01 14 00.00, 1.2.a.6 states to modify existing influent pumps.

What modifications are being performed to the pumps?

Influent pumps will be equipped with new VFDs as shown on sheet E-00-603, and sheet D-100-602.

No 0002

76 N/A N/A N/A GD05-101

Per gerneral note 5 on sheet GD05-101 states "if sludge quanties are less than idicated provide a credit". Please establish quanities.

Height or volumn of sludge to use for bidding purposes is provided in the table on GD05-101 and along with the dimensions of the structures provided throughout the contract, the contractor can determine the quantity of sludge.

No 0002

77 N/A N/A N/A GD05-101

Per gerneral note 5 on sheet GD05-101 states "if sludge quanties are less than idicated provide a credit". Will the contract be paid more if the quanities are higher?

A change from the overall quantities of sludge for the WWTP will result in a changed condition.

No 0002

78 N/A N/A N/A S-60-101 Are the concrete equipment pads shown plan sheet S-60-101, note 5 new or exisitnig?

Concrete equipment pads shown on sheet S-60-101 are all new as per note 5.

The PPI log is for informational purposes only. It does not amend the RFP. If a revision to the RFP is required, a formal amendment will be issued.

PPI # RFP Section Paragraph Number Page Number Drawing Number Question Government Response RFP / Solicitation Attachment

Provided Yes or No ACQ Amend

79 33 16 13.16 N/A N/A N/A

Section 33 16 13.16, Part 1.2.g states that the ‘Uplift resistance shall be achieved with soil tendon anchors embedded in the tank base mat in accordance with specification Section 31 68 13 Soil Anchors.’ Section 31 68 13, Part 1.4.2.a specifies the ‘Soil anchor shall be strand type.’ Strand type anchors provide tensile restraint but no compressive support. Should the tank designer determine that compressive support is also required in addition to tensile restraint, may piles be substituted for soil tendon anchors? Piles will be designed resist the uplift in accordance with Setion 33 16 13.16, Part 1.2.g.

Design shall be based on specification. If contractor calculations show additional compressive support is needed, it will be evaluated further during submittal review.

No 0002

80 462020 2.5.2.b

Requires a PLC in the control panel, but does not specify the manufacturer and model number. Spec 462020-2.5.2.a is referencing 409500, and its section 25 calls for a rack mounted modular PLC without the use of ribbon connectors between modules. The MicroLogix PLC has ribbon connectors, so it will not meet this requirement. The CompactLogix appears to meet this section with the exception of the comments they have about a Rack mounted PLC. The only Rack mounted PLC is the large ControlLogix type. Which type of PLC will the engineer be requiring.

PLC selection is not required to be chassis-based.

For clarification, the term "rack" is used to describe the rack/slot/point configuration of a typical PLC and not resticted to a chassis mount.

No 0002

81 462020

Does not outline an Operator Interface. The P&ID DI00-601 and Network diagram DI00- 701 do NOT show an Operator Interface in the Screen control panel. Section 409500-

2.5.8 outlines a high level industrial PC (IPC). Please advise if we should include the standard Operator Interface for set point changes only or the high level industrial HMI

Per design, no operator interface shall be present on the packaged screen panel; screen system graphics and control shall be accessible on the SCADA system HMIs identified on DI00-701.

No 0002

82 462020 Does not outline a UPS battery backup. Spec 409500 does outline a UPS battery backup. The P&ID DI00-601 and Network diagram DI00-701 do NOT show a UPS in the Screen control panel. Does a UPs need to be provided.

UPS is required for the panel in accordance with Specification 409500 2.4.9.

No 0002

83 462020

The specification does not state whether the control panel is NEMA 4X 304SS or 316SS. Please let me know your thoughts on the material type. Panel material shall be 316SS in accordance with specification 462020-2.1g.

No 0002

85 40 05 13 3.9 PENETRATIONS 40 05 13 - 37

Under spec 40 05 13 - 37, 3.9 PENETRATIONS. Galvanized steel wall sleeves are specified for use with rubber modular seals for wall penetrations. Spec "3.9.1 Molded Polyethylene Pipe Sleeve" specifies HDPE molded sleeves. Will HDPE wall sleeves be allowed in lieu steel wall sleves?

Pipe sleeves shall be as per specification 3.9, Use galvanizes sleeves for metallic pipe, and HDPE for plastic pipe.

No 0002

87 N/A N/A N/A S-30-101

Per sheet S-30-101, the top of tank floor of the Domestic Storage Tank is elevation 7.0.

Given that the design flood elevation is only 1.5’ higher than the tank floor elevation, can pressure relief valves (PRV) be used to compensate for the floor buoyancy in an empty tank and flood condition for the Domestic Storage Tank only?

See response for PPI #40.

Use of PRVs are not acceptable to NAVY.

No 0002

88 N/A N/A N/A D-99-804, D1

Sheet D-99-804 details various Wall Pipe Details A4, C3 & C4. These details appear to have been prepared for cast-in-place concrete structures. Prestressed concrete tank builders utilize details specifically designed for prestressed concrete tank structures.

Please confirm wall penetration details by the prestressed concrete tank manufacturer will be acceptable.

Wall penetrations unique to the selected Tank Manufacturer will be allowed but subject to Government and Engineer approval.

The PPI log is for informational purposes only. It does not amend the RFP. If a revision to the RFP is required, a formal amendment will be issued.

PPI # RFP Section Paragraph Number Page Number Drawing Number Question Government Response RFP / Solicitation Attachment

Provided Yes or No ACQ Amend

89 N/A N/A N/A S-43-101

Sheet S-43-101 Sheet Keynotes 6 states: ‘Design inner precast tank wall for attached launder and drop box.’ Is it the Engineer’s intent that the inner tank wall should designed and constructed as an AWWA D110 circumferentially prestressed concrete wall with a steel shell diaphragm similar to the outer tank wall?

Yes, the intent is that both inner and outer rings would be constructed as circumferentially prestressed concrete tanks. Modify wall construction in local areas to accommodate attached items like the launder and drop box.

No 0002

90 N/A N/A N/A S-00-001

Sheet S-00-001 Item 7 of the Foundation Notes provides design settlements for tank design. The settlement is presented at ‘Total’ and ‘Differential’ settlement. Please confirm the meaning ‘Total’ settlement. Is ‘Total’ settlement the settlement of the tank at the edge or the center? If at the edge, is differential settlement added to the ‘Total’ settlement to determine the settlement at the center of the tank?

See response for PPI #46. No 0002

91 N/A N/A N/A S-30-101

Per sheet S-30-101, the top of tank floor of the Domestic Storage Tank is elevation 7.0.

Given that the design flood elevation is only 1.5’ higher than the tank floor elevation, can pressure relief valves (PRV) be used to compensate for the floor buoyancy in an empty tank and flood condition for the Domestic Storage Tank only?

See response for PPI #40. No 0002

92 N/A N/A N/A D-99-804, D1

Sheet D-99-804 details various Wall Pipe Details A4, C3 & C4. These details appear to have been prepared for cast-in-place concrete structures. Prestressed concrete tank builders utilize details specifically designed for prestressed concrete tank structures.

Please confirm wall penetration details by the prestressed concrete tank manufacturer will be acceptable.

See response for PPI #88 No 0002

93 N/A N/A N/A S-43-101

Sheet S-43-101 Sheet Keynotes 6 states: ‘Design inner precast tank wall for attached launder and drop box.’ Is it the Engineer’s intent that the inner tank wall should designed and constructed as an AWWA D110 circumferentially prestressed concrete wall with a steel shell diaphragm similar to the outer tank wall?

See response for PPI #89 No 0002