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Nicholas Jones

Dan Shults

Route 7 PO Box 219
Colliersville , NY 13747

(315) 604-2402

(000) 000-0000

Hunts Point WWTP New Anaerobic Digesters - HP-238

1111111112503714

New York State Department of Environmental Protection

Bronx , Bronx County, NY

08/10/2021 at 02:00

Work Included in the Contract
1. Contract Name: HP-238 Hunts Point WWTP New Anaerobic Digester Facilities
2. The following is a general description of Work under this Contract only and shall not be construed as a complete description of the Work to be performed.
3. The project has a 23% MWBE requirement

4. Principal Items of Work:
a. Site clearing and hazardous/non-hazardous soil excavation and disposal.
b. Excavation dewatering and treatment and disposal of groundwater.
c. Stabilization of excavation system consisting of sheeting, shoring, steel sheet piling and secant piles.
d. Site grading
e. Four (4), 3.2 million gallon, post-tensioned, cast-in-place concrete digesters measuring eighty-two (82)-feet in interior diameter and approximately eighty-nine (89)-feet in sidewall height with concrete covers equipped with five (5) manways and four (4) sample ports. Digester tanks include aluminum cladding
system over exterior sprayed foam insulation barrier.
f. Cast-in-place concrete, partially buried equipment gallery at the base of the digesters constructed on a matt foundation at a finished floor elevation at twelve (12.0)-feet NAVD88.
g. Single-story gas room above the equipment gallery with an approximately four thousand two hundred thirty-four (4,234) square-foot footprint, with elevated cast-in-place concrete floor slabs supported by reinforced concrete columns, masonry exteriors and concrete roof slab.
h. Single-story control building above the equipment gallery with an approximately four thousand four hundred sixty-six (4,466) square-foot footprint, with an elevated cast-in-place concrete floor slab supported by reinforced concrete columns, masonry exteriors and concrete roof slab.
i. Single story, above ground digester feed pump station with an approximately fifty-five hundred (5,500) square-foot footprint, with a grade level cast-in-place concrete floor slab, reinforced concrete columns and beams, masonry exteriors and concrete roof slab.
j. Two (2) stairway towers, from equipment gallery to top of digesters with structural steel and cast-in-place concrete columns and beams, masonry exteriors and a concrete roof slab.
k. Prefabricated guardhouse at the new plant gate near the intersection of Ryawa Avenue and Manida Street.
l. Prefabricated, walkway bridges between digester tanks and stairway towers with a canopy roof.
m. Below grade, cast-in-place concrete pipe chase between the existing thickener building and new digester facility.
n. Digester feed system consisting of ductile iron piping from the discharge of each active gravity thickener discharge pump to two (2) mechanically mixed digester feed wells located west of the thickener building and digester feed pump station equipped progressing cavity digester feed pumps that discharge from the feed wells to the sludge digesters.
o. Sludge heating system including hot water supplied from the existing boiler facility in the Main Building, hot water pumps, hot water supply and return piping and tube-in-tube-style heat exchangers. Sludge heating secondary loop that includes hot water pumps, supply and return piping and heat exchangers. Sludge heating loop that includes one (1) tube-in-tube sludge heat exchanger and one (1) screw centrifugal-type sludge
recirculation pump per digester, with a swing pump as a spare for each pair of digesters.
p. Digester mixing system consisting of four (4), twenty (20) horsepower mechanical draft tube mixers per digester. q. Digested sludge conveyance system consisting of cast-in-place concrete sludge overflow boxes constructed to the exterior sidewalls of the digester tanks, digested sludge piping and valves, progressing cavity and recessed impeller sludge conveyance pumps and pipe connection to existing sludge transfer header.
r. Digester gas system consisting of two (2) dual pressure/vacuum relief assemblies with flame traps and safety selector valves on each digester, stainless steel digester gas piping, valves, overhead digester gas piping and support system, condensate and sediment removal equipment, three condensate control rooms, gas meters, four (4) waste gas burners located on a concrete pad west of the thickener building and pipe connection
to existing digester gas piping immediately upstream of the outdoor digester gas boosters located south of the Main Building.
s. Seal water system that includes skid mounted break tank, pumps, piping, valves and appurtenances and piping and valves to process pumps.
t. Service water system that includes skid mounted break tank, pumps, piping, valves and appurtenances and piping and valves to process pumps.
u. Electric power service for the new digester facility will be supplied from the switchgear 1512 and 1515 located in the existing Main Electrical Substation Building. A new buried electric ductbank will be run from the Main Electrical Substation Building to the pipe support bridge and the conduit will then be run on the pipe support bridge to the New Digester Facility Control Building to supply four thousand one hundred sixty (4,160) volt power. Control Building equipped with one (1) four thousand one hundred sixty (4,160) volt unit substation (USS) with main-tie-tie-main configuration Electrical room of Control Building equipped with main-tie-tie-main configured MCCs, four hundred eighty (480)/two hundred seventy-seven (277) volt panelboards for some four hundred eighty (480) volt loads, step-down transformers and panelboards for two hundred eight (208)/one hundred twenty (120) V loads. Additionally, electrical Work includes lighting, grounding, electrical power distribution to all motors, instruments, lighting and panels.
v. Heating, ventilation and air conditioning Work including ventilation and heating of the digester feed pump station, equipment gallery, control building and gas room. Ventilation, heating and air conditioning is provided in personnel areas and electric equipment room of the Control Building.
w. Plumbing including reduced pressure zone backflow preventer, piping, valves, cleanouts, traps, fixtures, floor drains, sump pumps and domestic hot water heating.
x. Buried utilities for stormwater drainage, sanitary sewer, process and rapid volume expansion drainage, fire hydrant and fire protection water, domestic water, natural gas meter/regulator assembly and piping.
y. Roadway subsurface and asphalt surface paving, concrete curbs and sidewalks and perimeter fencing.
z. Digester emergency overflow piping routed from the digesters to a twenty-four (24) inch diameter pipe in Ryawa avenue, and then to an existing manhole inside the plant property near the Screenings Building that discharges to the WWTP headworks.
aa. Replacement of manholes and rehabilitation of forty-two (42) inches sanitary sewer along the west side of the Site.
bb. Landscape trees, shrubs and turf plantings and bioswales.
cc. Instrumentation and controls improvements including open-architecture supervisory control and data access system, control and monitoring panels, instruments and devices, security improvements, alarms, closed circuit television, telephone and paging system.