B08_ATTACHMENT_A_SOW.pdf

ATCH02-SOW

RFQ

Potable Water Reservoir Death Valley National Park

PMIS 323905

Description of Work

Perform cyclic cleaning and inspection of eleven potable water storage tanks, and one raw water vault at Death Valley National Park.

Scope shall be performed by underwater operations utilizing certified personnel. All work shall be done in accordance with AWWA, NACE, SSPC, ASNT, ACI, and AWS standards.

- Remove all sediment from the floor of each tank

- Visually inspect the interior and exterior of the tank

- Video record the interior inspections

- Prepare written report with photos for each tank, describing any deficiencies in detail Deliverables: Written report; video recordings.

Background

Park staff and visitors depend on functioning potable water systems to provide safe drinking water in many areas of Death Valley National Park. The park operates eleven (11) water storage tanks ranging in size from 10,000 gallons to 2,000,000 gallons. The raw water collection vault at Mesquite Springs Campground needs inspection.

The park cyclic maintenance program requires thorough inspection of the tanks on a three-year cycle.

Contract Items

Tank Summary

TANK NAME SIZE (gal) MATERIAL CONSTRUCTION DIMENSION NOTES

WST 1 Scotty's Castle "Contemporary

65,000 Reinforced Concrete w/Prestressed Roof

Partially Buried 25'x40x'8'DP (rectangular)

WST 2 Scotty's Castle "Johnson"

40,000 Reinforced Concrete w/Prestressed Roof

Partially Buried 24'x48'x4.5'DP (rectangular)

Tank has PVC liner installed

WST 3 Grapevine 80,000 Concrete Buried 20'x80'x8'DP (rectangular)

Tank is divided into 2 sections, requiring 2 entries. All discharge water to be dechlorinated.

Requires 4WD access.

WST 4 Mesquite 20,000 Steel Above Grade 17'6"' dia x

10'DP

Walk-in access, park assistance with mobilizing gear to the tank

WST 5 Stovepipe Wells #1

20,000 Concrete Buried 10'x26'x16'DP (rectangular)

Discharge water and sediment to be surface discharged as directed on-site

WST 6 Stovepipe Wells #2

100,000 Prestressed Concrete

Buried 30' dia x 25'DP Discharge water and sediment to be surface discharged as directed on-site

WST 7 Wildrose 10,000 Fiberglass Buried 12' dia x 12'L WST 8 Emigrant 20,000 Concrete Buried 10'x26'x16'DP

(rectangular)

WST 9 Cow Creek 350,000 Concrete Buried 70' dia x 12'DP WST 10 Furnace Creek 2,000,00

Concrete Partially Buried 124' dia x

24'DP

WST 11 Mesquite Collection Vault

1,500 Concrete Buried 5'x5'x6' Deep Non-potable collection vault

Inspection Exterior/Interior:

Adhering to American Water Works Association (AWWA) C652-11 (or most current) The inspection shall be completed by a trained and qualified inspector as stated in AWWA D101-53. The purpose of inspection is to determine if repairs are required and, if so, the exact nature and extent of the work required. The inspection should outline specific maintenance needed to restore the tank(s) in good condition and submitted to the COR.

Cleaning:

All sediment, sludge and debris shall be removed from the tank’s interior. Tank shall be disinfected per AWWA standards C652-02 (or most current) prior to placing back in service. Written permission is required from the Utilities manager prior to returning to service. Contractor shall be responsible for all removal and disposal of all materials or sediment collected to an NPS-approved location. All discharge shall be de-chlorinated.

Upon completion, the work area shall be left clean of debris and trash associated with the work. There shall be no additional charges for removal and/or disposal of materials. It is the responsibility of the contractor to secure all work areas from unauthorized access. This may include, but is not limited to, installation of temporary work-site fencing, signage, and controlled access points. Contractor must provide a description of planned security measures.

Return Tanks to Service:

Any chemical contamination shall be eliminated by means of neutralization and/or flushing.

Tank shall be disinfected per AWWA standards C652-11 (or most current) prior to placing back in service. Written permission is required from the Utilities manager prior to returning to service.

Replace Float Mechanism:

The Grapevine tank requires the replacement of the float valve control prior to cleaning and inspection.

The float valve control CF1-C1 will be park provided.

Registration and Site Visit Meeting

a) Prospective offerors are encouraged to attend a site visit at the eleven locations for this project before submitting proposals.

b) An organized site visit has been scheduled for ______________ at 9:30 AM. Offerors should RSVP for the site visit in advance by contacting Marcy Frazier, Utilities Work Lead, Death Valley National Park,

(760) 786-3263 or marcia_frazier@nps.gov.

c) Participants will meet at Cow Creek Maintenance Yard, 579 Cow Creek Service Road Death Valley.

36.503536°, -116.868606°.

bmetler Highlight

Coordination of Work and Schedule

a) Contractor shall schedule the work at least 7 days in advance.

b) The park shall ensure tank water levels are as high as possible.

c) The park shall provide a utility operator escort/monitor for the work.

d) Field work shall be completed between September 1 and December 30.

e) Allowable work hours are Monday-Friday, 0600 hours to 1630 hours.

Water Tank Storage Tank Location Map

Mesquite Springs Tank Access:

Mesquite Springs potable water tank is only accessible via a high clearance four-wheel drive two track road. The contractor will be responsible to make sure their vehicle can traverse the entire distance of the road listed as Track

1 or carry the equipment up the footpath listed as Track 2 shown on the Mesquite Springs Potable Tank Access Map. This vehicle should be cleaned thoroughly prior to entry into the park and be inspected by Death Valley Park staff at the Cow Creek Maintenance Yard to be determined to be weed free prior to entering this access road.

Lat Long Plot Name

36°57'43.72"N 117°22'0.71"W Start of track

36°57'45.04"N 117°22'1.52"W Washout at campground

36°57'43.54"N 117°22'0.52"W Washout near amphitheater

36°57'43.35"N 117°21'59.58"W Small dip

36°57'43.24"N 117°21'59.21"W Small dip_

36°57'43.07"N 117°21'58.40"W Small dip 2

36°57'42.76"N 117°21'57.02"W Dip 1

36°57'43.17"N 117°21'56.13"W Washout2

36°57'46.89"N 117°21'50.59"W Washout3

36°57'47.01"N 117°21'50.24"W Enters wash

36°57'47.01"N 117°21'50.24"W Enters wash_a

36°57'48.67"N 117°21'46.73"W Enters wash_b

36°57'49.38"N 117°21'46.11"W Small dip after wash exit

36°57'49.38"N 117°21'46.11"W Rut

36°57'51.38"N 117°21'44.00"W Small dip before hill

36°57'51.89"N 117°21'43.34"W Erosion on first hill

36°57'52.85"N 117°21'42.22"W Erosion on second hill

36°57'55.54"N 117°21'42.28"W Road on top of hill

36°57'48.38"N 117°21'57.38"W Water tank

36°57'47.98"N 117°21'58.04"W Water tank 2

36°57'47.98"N 117°21'58.04"W Potable tank dist access vault

36°57'47.98"N 117°21'58.04"W Foot path erosion

36°57'47.82"N 117°21'59.80"W Foot path track 2

36°57'47.95"N 117°22'0.97"W Foot path from below

Start of path

Washout at campground

Washout near amphitheater

Small dip

Small dip

Small dip 2

Dip 1

Washout 2

Washout 3

Enters wash

Enters wash_a

Enters wash_b

Small dip after wash exit

Rut

Small dip before hill

Erosion on first hill

Erosion on second hill

Road on top of hill

Water tank

Water tank 2

Potable tank dist access vault (For reference only access to drain and distribution main)

Foot path erosion

Foot path track 2

Foot path from below