20220214_Amendment_5_IFB_72044021B00001_USAID Civil Works P1 for Dioxin Remediation at BH Airbase.pdf

5. PROJECT NO.

CODE

7. ADMINISTERED BY

2. AMENDMENT/MODIFICATION NO.

CODE

6. ISSUED BY

8. NAME AND ADDRESS OF CONTRACTOR

4. REQUISITION/PURCHASE REQ. NO. 3. EFFECTIVE DATE

9A. AMENDMENT OF SOLICITATION NO.

9B. DATED

PAGE OF PAGES

10A. MODIFICATION OF CONTRACT/ORDER NO.

10B. DATED

BPA NO. 1. CONTRACT ID CODE

FACILITY CODE CODE

Offers must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended, by one of the following methods:

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offers

E. IMPORTANT:

X is extended,

(a) By completing Items 8 and 15, and returning __________ copies of the amendment; (b) By acknowledging receipt of this amendment of each copy of the offer submitted; or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR AC- KNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY is not extended.

12. ACCOUNTING AND APPROPRIATION DATA

(REV. 10-83)

is required to sign this document and return copies to the issuing office. is not, A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT ORDER NO. IN ITEM 10A.

15C. DATE SIGNED

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

RESULT IN REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER

BY /s/

Contractor X one

16C. DATE SIGNED

14. DESCRIPTION OF AMENDMENT/MODIFICATION

16B. UNITED STATES OF AMERICA

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER 16A. NAME AND TITLE OF CONTRACTING OFFICER

15B. CONTRACTOR/OFFEROR

STANDARD FORM 30 STANDARD FORM 30

(Type or print) (Type or print)

(Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

(No., street, county, State and ZIP Code)

(If other than Item 6)

(Specify type of modification and authority)

(Such as changes in paying office, appropriation date, etc.)

(If applicable)

(SEE ITEM 11)

(SEE ITEM 13)

(X)

(X)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS,

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

(Signature of person authorized to sign) (Signature of Contracting Officer)

1 1

See Block 16 C USAID/Vietnam Office of Acquisition and Assistance (OAA) 15/F Tung Shing Building, 2 Ngo Quyen Hanoi, Vietnam

To all Offerors IFB No. 72044021B00001 one

Amendment No.5 to Invitation for Bids (IFB) No. 72044021B00001 USAID Civil Works for Dioxin Remediation at Bien Hoa Airbase Area – Phase 1

The purpose of this amendment is to:

1. Extend the “Closing Date to Receive Bids” from “February 18, 2022” to “February 25, 2022 at 4.00 pm Hanoi local time” and the “Virtual Bid Opening” from “February 23, 2022” to “March 2, 2022”. The Virtual Bid Opening event detail will be shared to all Bidders at a later date;

2. Incorporate questions received and answers thereto as detailed in Attachment No. 1 of this Amendment as an integral part of the IFB;

3. Replace in its entirety Attachment J.2 BID FORM with the version attached to this Amendment No. 5; and,

4. Replace in its entirety Attachment J.13 COMPENDIUM with the version attached to this Amendment No. 5.

Except as so stated and as detailed in the Amendment No. 5 and its attachments, all other terms and conditions in the original IFB and its Amendments remain the same.

Suzanne H. Johnson

February 14, 2022

Attachment No. 1 Amendment No. 5 to IFB No. 72044021B00001 USAID Civil Works for Dioxin Remediation at Bien Hoa Airbase Area – Phase 1

Questions Received Pertaining to IFB No. 72044021B00001 and Corresponding USAID Answers:

1. DONRE-A1, DONRE-A2 AREAS

As per the Contractor's initial investigation, there are many houses at the DONRE-A1 which were built by permanent reinforce concrete structures (see attached photos). We do understand that this DONRE area will be resettled prior to handing over to Contractor for working in Year 4. We would like to be provided more information:

Which condition of those houses will be handed over to the Contractor? The MND/local authority shall demolish and remove those houses and hand-over the land to the Contractor at the above ground structures only or including the foundation of houses' structures?

USAID: The areas will be cleared of above ground structures. Below-ground foundations will remain for Contractor removal. Additional characterization of these areas will occur following removal of above grade structures to finalize the excavation design of this area. See answer to question 2 below for additional clarification on handling at or below-ground debris in dig and haul areas.

2. ZT-02 AREAS

Thru our initial survey on google earth and the virtual meeting, it’s found that these areas seem to be the old runway or permanent storage foundation. There’s large area of concrete pavement and concrete slab inside those ZT areas. Those ZT areas are quite huge as view from google earth with the approximate length of 50 meters. It’s written at the Page 9 of the revised IFB – Work Component 2 – Dig and Haul: the Contractor must excavate high and low concentration dioxin contaminated materials from DUs in the SW, PI, NE, NW, ZT, and NF areas of the airbase and off-base DUs at DONRE- A1, DONRE-A2, PI-12, and PI-15 and transfer to LTSA or PTSA in accordance with the final designs. And the SoW of the Contractor to be, at the minimum:

THIS AREA IS INTENTIONALLY LEFT BLANK

Amendment No. 5 to IFB No. 72044021B00001 USAID Civil Works for Dioxin Remediation at Bien Hoa Airbase Area – Phase 1

During the review of specifications and IFB, there was no guidance or specifications for sampling and analysis plan for the dioxin concentration in the surface of the debris/boulders. From that, the Contractor can determine the testing frequency and testing quantity for this component as stipulated in the requirements of Dig & Haul section. The Offeror would like to have more information on this.

USAID: The Waste Management Plan requirements have been updated in Attachment J.3 COMPENDIUM Section 01 30 00 ADMINISTRATIVE REQUIREMENTS to provide additional clarification. A revision table summarizing the changes to be incorporated in Attachment J.3 COMPENDIUM through this Amendment are included under item 11 below.

In addition, IFB Section C.5 WORK COMPONENTS, WORK COMPONENT 2 has been revised as follows:

a) DIG AND HAUL, first bullet is revised as shown in tracked changes below:

“● Dig and Haul: To complete this component, at a minimum, the Contractor must:

– Clear and chip above grade vegetation, set aside for later use in site restoration.

– Dewater excavation areas as required.

– Excavate high and low concentration DUs as indicated in the final designs. All low concentration material must be hauled and placed in the LTSA. All high concentration material must be hauled and placed in the

PTSA.

– Non-porous items, such as gravel, Gravel, stones, rocks, and boulders greater than or equal to 100 mm in size from low-concentration areas will be placed in the LTSA. Do not place directly on or under geotextile or HDPE liners. Provide a minimum soil cushion of 15 cm between liners and gravel, stones, rocks, and boulders. Non-porous items such as gravel, Gravel, stones, rocks, and boulders greater than or equal to 10 cm 100 mm in size from high concentration areas must be mechanically cleaned and the surface must be tested by the Contractor (See details below). Rocks and boulders must be scrubbed if testing shows contamination and retested until clean. Cracked rocks and boulders must be masticated before hauling to PTSA and clean/uncontaminated rocks and boulders, meeting the limit of 40 ppt TEQ, must be transported to an approved location on-base. Depending on nature and quantity, placement of material must be coordinated with the A&E Contractor and the Treatment Contractor.

– Set aside debris from low concentration areas contaminated debris including but not limited to at or below-ground foundations, structures, underground utilities, asphalt and concrete paving, stumps and roots encountered during excavation and place them in the LTSA. same storage area in which surrounding material is specified to be placed. Before moving contaminated debris to the LTSA or PTSA, crush concrete

Amendment No. 5 to IFB No. 72044021B00001 USAID Civil Works for Dioxin Remediation at Bien Hoa Airbase Area – Phase 1 and materials with voids, chip stumps and roots to less than 10 cm in any dimension. Do not place debris directly on or under geotextile or HDPE liners. Provide a minimum soil cushion of 15 cm between liners and debris.

– Debris at or below-ground including but not limited to foundations, structures, underground utilities, asphalt and concrete paving, stumps and roots from high concentration areas must be mechanically cleaned and sampled using 30-point multi-increment sampling (MIS) in accordance with Compendium requirements.

Cleaned material with results under 40 ppt TEQ must be moved to the UCDDA, or other approved location on-base. Material with results of 40 to under 1200 ppt TEQ must be moved and placed in the LTSA, following requirements of debris from low concentration areas. Depending on the nature and quantity, movement of material to the PTSA must be coordinated with the A&E Contractor and the Treatment Contractor. Material unable to meet under 1200 ppt TEQ must be crushed or chipped to less than 10 cm in any direction and placed in the PTSA. Do not place debris directly on or under geotextile or HDPE liners.

Provide a minimum soil cushion of 15 cm between liners and debris.

– Unload low concentration material from the LCSA, haul, place, grade, and compact material in the LTSA.

– Unload high concentration material from the HCSA and the HCTS, haul, place, and grade material in PTSA.

– Unload treated material from the TMSA, place and grade in approved stockpile or backfill areas, compact in backfill areas.

– Provide temporary cover on a daily basis consisting of a high-density polyethylene (HDPE) layer, secured by placing a sandbagged soil anchor to provide a continuous seal along the base.

– Provide cover for the rainy season as indicated in the drawings.

– Provide groundwater monitoring wells, locations to be coordinated with the A&E Contractor.

– Protection or removal and replacement of existing structures as required.”

b) Also add Repair Existing Monitoring Wells work as a forth bullet under WORK COMPONENT 2 - DIG AND HAUL.

“● Repair Existing Monitoring Wells: The Contractor must repair existing monitoring wells. At a minimum, the

Contractor must:

– Demolish and repair damaged surface completion.

– Remove and replace surface casing if damage less than 1 meter below ground surface.

– Remove and replace protective casing and locking mechanism.

– Redevelop well after repairs are made.

– Resurvey top of casing to specified precision and ground surface after any repairs that change the casing.”

3. Under Section C.5 WORK COMPONENT, paragraph WORK COMPONENT 4 - PROTECT, MAINTAIN, AND HANDOVER ASSETS IN PROJECT AREAS, has been revised as shown below to add the following bullet, “● Monitoring wells.”

“WORK COMPONENT 4 - Protect, Maintain, and Handover Assets in Project Areas: The Contractor must protect and maintain all work areas and assets handed over from MND to USAID, as summarized below. The Contractor must handover all work areas in good working condition for use by the Airbase or other USAID contractors at the end of the period of performance. The Contractor must also provide temporary cover over all stored materials on a daily basis consisting of a high-density polyethylene (HDPE) layer, secured by placing sandbagged soil anchors to provide a continuous seal along the base. To complete this component, the Contract must protect and maintain the following areas:

● Installed storage areas and all associated work upon handover from other USAID contractors as noted in Section C.9

“Work by Others”. See Attachment J.9 40 LTSA Final Cover, Attachment J.10 IM1 LCSA and HCSA and Staging Area Plans and Sections, and Attachment J.11 IM2 LTSA and HCTS Plans and Sections − LTSA including installation of final cover: The Contractor must install final cover upon completion of loading all low concentration dig and haul material for CLIN 1 and associated excess material from CLIN 3. If CLIN 4 is exercised, the Contractor must also install final cover upon completion of loading all low concentration dig and haul material for CLIN 4 and associated excess dig and haul material from CLIN 3. This consists of:

▪ Non-woven geotextile fabric layer.

▪ HDPE double sided rough geomembrane liner.

▪ Anchor base of fill area north of the internal roadway with stone masonry channel between base of fill area and the existing access road, tie-ins to existing culverts.

▪ Sandbag anchor at base along the east side.

▪ Galvanized gabion.

▪ Geo-composite drain.

▪ Clean soil backfill.

▪ Top soil for native grass.

▪ Native grass.

Amendment No. 5 to IFB No. 72044021B00001 USAID Civil Works for Dioxin Remediation at Bien Hoa Airbase Area – Phase 1

▪ Irrigation system, including groundwater wells.

− LCSA

− HCSA

− HCTS

− UCDDA.

● Treatment area components under the Civil Works – Phase 1 contract including the PTSA, PTSA detention ponds, pump station, drainage, and all associated work.

● Roadways, ditches, grass cutting and tree trimming alongside roadways, guard shacks, fencing, and all associated work.

● Existing steel fencing, as shown in Attachment J.3 Civil Works – Phase 1 Overview.

● Monitoring wells”

4. A revised Attachment J.2 BID FORM is being issued through this Amendment with the following additional Bid Items:

● 01.40.07 Monitoring Wells (for maintenance during CLIN 1)

● 03.20.13 Repair Existing Monitoring Wells

● 04.40.05 Monitoring Wells (for maintenance during CLIN 4)

5. Would the government request the bonds (including bid, performance, and payment bonds) for the first 3 years base period only or all 4 years? If 3 years base period only, will CLIN3 be considered in base bid or an option? And at which point the 4th year wouldn’t be an option?

USAID: The base bid price is considered as the total of “CLIN 1 SUBTOTAL” + “CLIN 2 SUBTOTAL” + “CLIN 3 SUBTOTAL” in the revised Attachment J.2 BID FORM (provided with this IFB amendment No. 5).

In accordance with L.4 INSTRUCTIONS FOR THE PREPARATION OF BIDS, item 4(vii), the bid package shall include a “Bid Guarantee at 20% of the base bid price, but not to exceed $3 million.”

The performance bond (30% of the base bid price) and payment bond (30% of the base bid price) are required within 10 days of Contract award per F.5.1 BONDS OR GUARANTEES FOR CONTRACT PERFORMANCE. The base bid price consists of the sum of CLIN 1, CLIN 2, and CLIN 3.

The timing for exercising CLIN 4 Option Period is still unknown. However, it will be exercised prior to demobilization. The Contractor will be notified ahead of time to allow for sufficient preparation and action. The performance and payment bonds for the CLIN 4 Option Period will be required within 10 days after the notification of exercising of the CLIN 4 Option Period.

In the revised Attachment J.2 BID FORM, Bid Item No. 01.00.08 includes the bonds and guarantees for the base period and Bid Item No. 04.00.08 includes the bonds and guarantees for the CLIN 4 Option Period.

To reflect these clarifications, the following changes have been made to the IFB:

Delete and replace in its entirety paragraph F.5.1 BONDS OR GUARANTEES FOR CONTRACT PERFORMANCE in the original IFB and its amendments with the following:

“F.5.1 Bonds or Bank Guarantees for Contract Performance

Within 10 calendar days after the date of Contract Award, the Contractor must furnish the Contracting Officer a Performance Security – Performance and Payment Bonds The Performance Bond (30% of the base bid price) and Payment Bond (30% of the base bid price) or Bank Guarantee from a certified bonding agent, an established bank, or financial institution - that meets the approval of the Contracting Officer for the performance of all work in the base Contract (CLIN 1, CLIN 2, and CLIN 3). The Security shall be irrevocable and on demand. The Security shall be in the amount of 30% of the Contract value. The Security shall be dated as of the Contract Award date or no more than ten (10) calendar days thereafter. The Security shall state that it will continue in effect for one year after the date of the last work accepted by USAID under this Contract, in the amount of 10% of the Contract value. The Security must also state that the bank/surety agrees and consents that the Contract may be modified by change order(s) or supplemental agreement(s) without affecting the validity of the Performance and Payment Bonds or Bank Guarantee.

If CLIN 4 Option Period is exercised, the Contractor must furnish the Contracting Officer a Performance Security - Performance Bond (30% of the CLIN 4 Option Period value) and Payment Bond (30% of the CLIN 4 Option Period value) or Bank Guarantee from a certified bonding agent, an established bank, or financial institution within 10 calendar days after

Amendment No. 5 to IFB No. 72044021B00001 USAID Civil Works for Dioxin Remediation at Bien Hoa Airbase Area – Phase 1 the Option Period begins, meeting the same requirements stated above.”

6. VALUE OF PERFORMANCE AND PAYMENT BONDS

In the Section F.5.1 Bonds or Guarantees for Contract Performance and at the Question 1 attached to Amendment 1 of the

IFB:

“Within 10 calendar days after the date of Contract Award, the Contractor must furnish the Contracting Officer a Performance Security – Performance and Payment Bonds or Bank Guarantee from a certified bonding agent, an established bank, or financial institution – that meets the approval of the Contracting Officer for the performance of all works in this Contract. The Security shall be irrevocable and on demand. The Security shall be in the amount of 30% of the Contract value”.

We would like to request for interpretation that:

(1) Total Performance and Payment Bonds will be at the amount of 30% of Contract value, or

(2) The amount of Security Bonds will be:

i. The Performance Bond will be at 30% of Contract value, and

ii. The Payment Bond will be at 30% of Contract value

USAID: See answer to Question 5 above.

7. SECTION C.7 REQUIRED REGISTRATION AND LICENSES

5.1. Refer to Section C.7 Required Registration and Licenses extracted from Amendment No. 3 dated February 22, 2022:

5.2. Pursuant to Circular No. 06/2021/TT-BXD dated June 30, 2021, stipulating the classification of works in accordance with structure scale:

Construction scale of PTSA: the figures of construction area of PTSA containing contaminated soil to be treated as follow:

(i) Construction Area: >30,000m2.

(ii) Storage area of contaminated soil: >60,000m3 of high concentrate contaminated soil and sediment Pursuant to Section 2.4 of Table 2. Classification of construction works in accordance with structure scale at stipulated at Appendix II of Circular No. 06/2021/TT-BXD dated June 30, 2021, by the Ministry of Construction (MoC), to implement the construction work item of Pre-Treatment Storage Area (PTSA) of 60,000m3, the contractor is minimum required holing the Construction Operation Capacity License of Grade I.

Amendment No. 5 to IFB No. 72044021B00001 USAID Civil Works for Dioxin Remediation at Bien Hoa Airbase Area – Phase 1

Regarding the drainage work item at PTSA, HDPE with dimension of 1200mm is used as per design drawings, it’s stipulated at Section 2.10 of Table 2 Classification of construction works in accordance with structure scale, the contractor is minimum required holding the Construction Operation Capacity License of Grade II.

Currently, our company is certified of Construction Operation Capacity License of Grade 3. With our legal experience to previous construction works in fulfill the procedures of as-built documentations before handing-over to the Client / Owner, it’s required the Contractor holding the equivalent license / certificate as stipulated at Circular No. 06/2021/TT-BXD. If not meet the requirement, the Contractor is not qualified to sign-off on the as-built documentation for handing-over to operations. We hereby to request the response from the Owner if the Offeror is qualified to join this IFB and submit the bidding documentation. We would like to enclose the Circular No. 06/2021/TT-BXD dated June 30, 2021, by MoC in the attachment for the Owner’s review and consideration.

USAID: It is up to Bidders to determine their eligibility under Article 83 of Decree 15/2021/NDCP to comply with C.7 REQUIRED REGISTRATION AND LICENSES and applicable Government of Vietnam regulations.

8. SUBMISSION OF BIDDING DOCUMENT / FILE

It’s mentioned at the Cover Letter of IFB, the closing date to receive the bids is February 18, 2022 at 4:00 p.m. Hanoi local time. It’s experienced that the size of bid documentation is quite big, while the emailing size has limitation of 20.0Mb ~ 25.0Mb. To prevent the unstable internet connection and the limitation of email transferring, which effects the time of bid receiving, we are asking for the consideration, approval, and/or instruction from USAID/Vietnam on:

(1) The bid documentation will be divided into separate files <20Mb,

(2) The bid will be emailed to the nominated USAID’s emails before the closure time and date to receive the bid.

However, to ensure the security and the transparent for the OWNER and the fair between all Offerors, the Contractor recommend that the file of Bid form (J.2 in .pdf and native file) will be protected with password. The passwords of Bid form (for .pdf and native) will be emailed separately to the nominated USAID’s email around 30 minutes after the closing time and date to receive bids.

USAID: Following section L.4 INSTRUCTIONS FOR PREPARATION OF THE BID of the IFB, bidders may submit a bid package in separate emails not to exceed the 20 MB limit for each email. If you submit your bid package by multiple emails, please indicate in the subject line of the email the desired sequence of the submitted emails and of attachments (e.g. "no. 1 of 4", etc.). For example, if your bid package is being sent in two emails, the first email must have a subject line which says: "[organization name], IFB No. XXX, Part 1 of 2". If you wish, you may submit a separate email containing passwords. However, the Bidders assume all responsibility for ensuring that USAID POCs indicated in the IFB have received an accurate and complete version of the bid package—including email with password (if any), any annexes or attachments thereto—through e-mail(s) within the specified date and time in the IFB and as amended. USAID bears zero responsibility for data errors or data loss while either transmitting, converting, downloading, or printing the bid package.

Amendment No. 5 to IFB No. 72044021B00001 USAID Civil Works for Dioxin Remediation at Bien Hoa Airbase Area – Phase 1

Please also note that the bid submission and the bid opening dates have been changed as detailed in the cover page of this amendment.

9. BANK VOLUME QUANTITIES >1.5M. In Attachment J.2 Bid Form, please clarify the quantities for:

● 01.20.02 - Dig and Haul - Excavation, Dewatering and Drainage, Stockpile, Transport, and Placement and

Grade of Soil - Excavation Depth up to 1.5m

● 01.20.03 - Dig and Haul - Excavation, Dewatering and Drainage, Stockpile, Transport, and Placement and

Grade of Soil - Excavation Depth >1.5 m Would these quantities apply to the same area? For example, if a specific area requires excavation up to 2.0 m, is the first 1.5 m covered under 01.20.02 and the additional 0.5 m depth covered under 01.20.03?

USAID: Dig and haul quantities for bid items 01.20.03, 03.20.02, and 04.20.03 include bank volumes for areas with anticipated depths greater than 1.5m below-ground and already include quantities up to 1.5m depth in that same area.

Where the depth of excavation in an area is greater than 1.5 m (for example 2.0 m), that entire volume is included under 0.1.20.03, 03.20.02, or 04.20.03 as applicable.

10. I am writing to obtain your clarification on the difference regarding the amount of the required payment and performance bonds as discussed in Subsections F.5.1 and I.6 below. The yellow highlighted text shows 30% of the contract value in Subjection F.5.1 versus 100% of the original contract price in Subsection I.6.

USAID: See answer to Question 5 above.

11. An updated Attachment J.13 COMPENDIUM is being issued through this Amendment to reflect the changes summarized below:

SECTION NUMBER DESCRIPTION

01 30 00

ADMINISTRATIVE

REQUIREMENTS

REPLACE paragraph 3.05.C with the following:

C. The CONTRACTOR must plan to dispose of all solid wastes resulting from Contract implementation that were present on the Airbase or off-base Decision Units before Contract implementation, including those wastes derived from site clearance and demolition, in an on-base area as shown on the Contract Documents, as directed by the ENGINEER/CONSTRUCTION MANAGER, or to be identified by the CONTRACTOR and approved by Air Defense Air Force Command (ADAFC). All other solid wastes derived from the Contract implementation will be disposed of outside the Airbase in compliance with the standards and regulations specified in the Waste Management Standards. The Contractor must clean/decontaminate all waste material and test all non-porous waste materials for residual dioxin contamination on a volumetric basis before seeking COR approval for the disposal.

1. Cleaning/decontamination of materials must be performed mechanically. Decontamination waste must be characterized and disposed of appropriately.

2. Sampling for porous material, including but not limited to building materials and underground utilities, must be performed using the 30-point multi-increment sampling (MIS) method.

a. Samples must be 10 cm deep core samples with a minimum frequency of 100 cubic meters or for each discrete structure/material type.

01 35 29 HEALTH AND SAFETY DELETE the following phrase from paragraph 1.08.C.2.a.11): “…including monitoring ionizing radiation.”

32 80 00

IRRIGATION SYSTEM

REPLACE paragraph 2.02 with the following:

“2.02 PIPES AND FITTINGS

A. Pipe sizes as shown on the drawings. Pipe materials include HDPE, stainless steel, and as shown on the drawings.

B. Fittings must be the same size as the piping served.

C. Pipes and fittings must meet performance requirements for pressure applications and per design standards.

32 80 00

IRRIGATION SYSTEM

REPLACE paragraph 3.04.A.1 with the following:

“All lateral piping must be buried a minimum of 300mm below finished grade, or as shown on the drawings. All main piping must be installed with a minimum of 450mm of cover, or as shown on the drawings.

[END OF ATTACHMENT 1]

[END OF IFB AMENDMENT NO. 5]