140P1522R0003_Amd_2_0002.pdf

(x)

140P1522R0003 x x

1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted ; or (c) By separate letter or electronic communication which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGEMENT TO BE

RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY 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 letter or electronic communication, provided each letter or electronic communication makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

x

PIA

Flagstaff AZ 86001-2694 1824 S Thompson St, Ste 200 NPS, IMR - Arizona MABO

07/19/20220002

13. THIS ITEM ONLY APPLIES TO MODIFICATION OF CONTRACTS/ORDERS. IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

12. ACCOUNTING AND APPROPRIATION DATA (If required) is not extended.is extended, Items 8 and 15, and returning

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: (a) By completing

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

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

FACILITY CODE CODE

10B. DATED (SEE ITEM 13)

10A. MODIFICATION OF CONTRACT/ORDER NO.

9B. DATED (SEE ITEM 11)

9A. AMENDMENT OF SOLICITATION NO.

CODE

8. NAME AND ADDRESS OF CONTRACTOR (No., street, county, State and ZIP Code)

7. ADMINISTERED BY (If other than Item 6)CODE 6. ISSUED BY

PAGE OF PAGES

4. REQUISITION/PURCHASE REQ. NO.3. EFFECTIVE DATE2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO. (If applicable)

1. CONTRACT ID CODE

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

06/23/2022

CHECK ONE A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE CONTRACT

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority) appropriation data, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(b).

E. IMPORTANT: Contractor is not is required to sign this document and return __________________ copies to the issuing office.

ORDER NO. IN ITEM 10A.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

A. Project Title: Rehabilitation of North Rim WWTP Valves, Pumps, and Headworks, Grand

Canyon National Park, AZ

B. The time and date for receipt of proposals is extended to July 29, 2022 at 10:00am Local

Time.

See Attachment for text of Amendment.

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)15A. NAME AND TITLE OF SIGNER (Type or print)

15C. DATE SIGNED 16B. UNITED STATES OF AMERICA 15B. CONTRACTOR/OFFEROR 16C. DATE SIGNED

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

Connie Gordon

STANDARD FORM 30 (REV. 11/2016)

Prescribed by GSA FAR (48 CFR) 53.243

Previous edition unusable

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

Solicitation No. 140P1522R0003 Rehabilitation of North Rim WWTP Valves, Pumps, & Headworks, Grand Canyon National Park, AZ Amendment No. 002

Rehabilitation of North Rim WWTP Valves, Pumps, & Headworks

AZ CONTRACTOR QUESTIONS/ANSWERS

1: In-Park Contractor Housing / Laydown Area:

Is there an area that contractor personnel can have temporary lodging in the Park (North Rim)?

Response: See the “Lindberg Hill Staging Area” on Sheet C1.2 for potential: temporary facilities, construction materials, equipment, limited personnel, overnight accommodations, and RVs. Please note, per C.1.2, the number of limited personnel is “determined by the Contracting Officer.”

Also refer to Specification Section 011100 – Summary of Work, Part 1.5 E Contactor Use of Site Construction Camp:

“Construction Camp: Establishment of a camp will be permitted at the Lindbergh Hill staging area. Only dry camping will be allowed in this area. Nearest lodging locations outside the park include Jacob Lake, AZ 44 miles from the site or Kanab, UT 80 miles from the site.”

2: North Rim WWTP Staging Area:

The proposed North Rim WWTP Staging Area (construction materials and equipment) shown on C1.1 & C1.2 appears to interfere with existing WWTP operations. Is there an alternate location available?

Response: The GRCA WWTP Facility Operator confirmed that the proposed Staging Area shown on C1.1.

does interfere with existing WWTP operations. Instead, a Staging Area equivalent in size will be available near the WWTP entrance gate; the precise location to be coordinated after Contract Award.

3: Water Access for Construction Use:

Will the contractor be able to connect to GRCA water for construction purposes?

Response: Refer to Specification Section 015000 – Temporary Facilities and Controls, Part 3.2 A General:

“Install temporary service or connect to existing service.

1. Arrange with NPS, and existing users for time when service can be interrupted, if necessary, to make connections for temporary services. Acquire all necessary permits. Water, sewer and power may be available for contractor use at the plant. Power & sewer are no cost to contractor. Potable water use shall be metered and costs $36.03/1000 gallons. Contractor shall meter and monitor water use and pay for use. Adequate backflow prevention required.”

4: What Time Zone are Bids Due?

Response: Per this Amendment, proposals are due 7/29/2022 at 1000 “local time.” Local time is the location of the job site in the Grand Canyon National Park, which is in Arizona time.

5: Work Outside of Normal Working Hours:

Due to the relative isolation of the North Rim in the Grand Canyon National Park, is it possible to work outside of the normal work hours?

Response: Refer to Specification Section 011100 – Summary of Work Part 1.6 B Conduct of Operations:

& Headworks, Grand Canyon National Park, AZ Amendment No. 002

“Work on Saturdays, Sundays, Federal holidays or at night may not be performed without prior consent from the Contracting Officer. Submit requests 48 hours in advance of the work to the Contracting Officer for approval.”

Part 1.7 A Work Restrictions:

“On-Site Work Hours: Work shall be generally performed during normal business working hours of 7 a.m.

to 5 p.m., Monday through Friday, except when otherwise indicated.

1. Weekend Hours: Weekend work may not be performed without prior consent from the Contracting Officer or their representative. Submit requests 48 hours in advance of the work.

2. Early Morning Hours: Will be allowed with prior approval of the Contracting Officer.”

6: SCADA Reprogramming:

Verify which party is responsible for any reprogramming of the SCADA system.

Response: Per Appendix A, SectionA.4, there are three categories of programming modifications that the Contractor needs to execute:

• A.4.A. VFD Reset Programming

• A.4.B. AWT Backwash Valve Operation

• A.4.C. AWT Backwash Waste Valve Operation

7: Sludge Pumps:

Requesting clarification of equipment specified for this referenced project. In question are one sludge pump and two equalization pumps. The one sludge pump is specified on C2.5 while the two Equalization Pumps are specified on C2.6. Both images are pasted below. The information on the pumps is incomplete.

In all three cases we need the Flow in GPM and Head in TDH Feet in order to make an appropriate selection. Impeller diameters and or Model numbers alone could lead to the selection of the wrong pump(s) leading to a misapplication.

The information we are requesting is commonly provided by design engineers.

Response: The pumps are specified in Spec Section 46 06 07 – Schedules for Packaged Treatment Equipment. Everything you are looking for can be found in this spec.

8: Sludge Pumps:

We examined the specifications and believe we discovered some inequities that may negatively impact this proposed application of Dry Pit Pumps. In the simplest of terms we believe both dry pit pumps are specified with underpowered electric motors. Specified are 2 HP and 5 HP Motors. To meet the required flow and head performance you will likely need 7-1/2 HP and 15 HP respectively depending upon the level of protection you desire.

Attached are the performance data sheets for both Deming Pumps that are published in the public domain.

We have added some callouts and comments to assist you in understanding our assessment. In addition we have attached some performance data on ESSCO Pumps which can also deliver your required performance but at a higher horsepower. Note the ESSCO Pumps can pass 3" solids, far greater than the

& Headworks, Grand Canyon National Park, AZ Amendment No. 002

2" solids of the Deming Pumps. The higher horsepower required will additionally impact the sizing of electrical components from power cords to control equipment.

This is an example of how we arrived at our conclusions. Take for example the proposed 2 HP Pump rated 240 GPM @ 40 ft TDH. Using the horsepower formula Q / 3960 X H / Eff = HP Required.

240 / 3960 X 40 / .58 = > 4HP. Perhaps there is suction pressure that would reduce the head to 20 Feet VS the specified 40 Feet, we just do not know. Would you please review our attachments knowing that we are not trying to create unnecessary work for you but rather are doing our best to understand your needs. We additionally request that you name ESSCO Pumps as an approved competitor to Deming.

Response: Operating points identified below.

Pumps list salient characteristics with a named manufacturer or approved equal. Proposed pumps are required to meet the salient characteristics as stated in the specifications.