attachment-1-rfp-des-2026-16.pdf
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- Solicitation number
- RFP DES 2026-16
- Issued by
- Belknap County, New Hampshire
About this file
This is a Confined Space Entry Safety Checklist document for wastewater treatment facilities operated by the State of New Hampshire, specifically covering operations at the Franklin Compound, Laconia Compound, and associated pump stations and siphon locations throughout the Winnipesaukee River Basin service area. The document establishes safety protocols and identifies potentially hazardous confined spaces requiring permits, checklists, and specialized equipment before entry. The checklist applies to three primary facility locations: the Franklin Compound (including OPS Building & Tunnels, Primary and Secondary Treatment areas, Disinfection Facilities, Solids Handling Areas, and Plant Grounds); the Laconia Compound (including flow channels, pump stations, clarifiers, and contact tanks); and Other Locations (including sewer and drain manholes, catch basins, metering chambers, siphon chambers, and pump stations at Smith Road, Lower Bay Road, and Belmont). All confined space entries must comply with 29 CFR 1910.146(b) and LAB 1402.02 regulations.
Safety requirements vary by location and hazard type, with specific precautions mandated for atmospheres testing positive for low oxygen, toxic gases (particularly hydrogen sulfide), fire and explosion risks, and engulfment hazards. Standard entry requirements include gas meters, safety attendants, harnesses, tripods or davit arms, blowers for ventilation, hard hats, and the two-man rule. Critical restrictions prohibit blower use when Lower Explosive Limit (LEL) readings reach or exceed 100 percent, as introducing air could trigger explosions. Certain tanks (clarifiers, aeration tanks, and contact tanks) require continuous atmospheric monitoring and attendants only during cleaning operations, but become non-confined spaces afterward if standards are met. Digesters entered after cleaning or painting require mechanical ventilation, with subsequent entries requiring continuous gas monitoring and attendants. Specific pump station locations are designated as non-atmospheric hazards under certain conditions, allowing discretionary use of safety equipment based on attendant judgment.
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| File | Type | Posted |
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| attachment-3-rfp-des-2026-16.pdf | ||
| attachment-2-rfp-des-2026-16.pdf | ||
| attachment-4-rfp-des-2026-16.pdf | ||
| rfp-des-2026-16.pdf |
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Text version
P e rm it R e q u ir e d
C h e c k lis t R e q u ir e d
L o w O x y g e n
S e e N o te
F ir e
E x p lo s io n
T o x ic
G a s e s S e e
N o te
F a lls
L iv e W ir e s
M o v in g M a c h in e ry
E n g u lf m e n t
D ro w n in g
F a lli n g O b je c ts
G a s M e te r
H a rn e s s
T ri p o d /D a v it A rm S e e n o te
H a rn e s s
L a n y a rd
L o c k o u t
T a g o u t
B lo w e rs S e e n o te
H a rd H a t
T w o M a n
R u le
S a fe ty
A tt e n d a n t
C o m p lia n c e w /L a b
.2
OPS Building & Tunnels NOTES:
OB Drain Pit ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
All drain sumps in tunnels ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Reaction tank ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Retention tank ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Headworks Influent chamber before headworks ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Flow channels ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Aerated grit chambers empty See note (1) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Grit chamber channels ✓ ✓ ✓ ✓ ✓ ✓ ✓
Primary Treatment Primary Clarifier splitter box ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Primary Clarifier empty See note (1) ✓ ✓ ✓ ✓ ✓ ✓ ✓
Clarifier scum wells ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Clarifier launders ✓ ✓ ✓ ✓ ✓ ✓ ✓
Aeration Tanks Aeration tank splitter box ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Aeration tanks clean and empty See note (1) ✓ ✓ ✓
Secondary Clarification Secondary clarifier splitter box ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Secondary clarifier empty See Note (1) ✓ ✓ ✓ ✓
Clarifier launders ✓ ✓ ✓ ✓ ✓ ✓ ✓
Clarifier scum wells ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Secondary station drain pit exterior ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Secondary flume chamber ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Disinfection Facilities UV inlet chamber ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Old contact tank, empty ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
UV flow channel, empty ✓ ✓ ✓ ✓ ✓ ✓ ✓
UV "bypass" channel ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Contact tank, empty See note (1) ✓ ✓ ✓ ✓
Plant Water well, empty ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
UV Building Drain Pump ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Solids Handling Area Septage tanks , empty ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Thickeners, Inspections ✓ ✓ ✓ ✓
Thickeners ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Thickeners, empty ✓ ✓ ✓ ✓ ✓ ✓ ✓
Thickener valve pit ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Thickener scum wells ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Anaerobic digester covers Primary See note( 5 ) ✓ ✓ ✓
Anaerobic digester covers Secondary ✓ ✓ ✓ ✓ ✓ ✓ ✓
Below Digester (inside) See Note (2) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Interior of Primary Digester covers ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Tunnel 4 drain pit ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Plant Grounds/Manual Road Pressure reducing valve chamber ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Meter/backflow prevent or vault ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Flow channels ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Catch basin sumps, 4' deep or greater ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Sewer manholes/drain manholes ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Centrate tank ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Electrical vaults/wire pulls, 4' deep or greater ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Training center sewage pump vault ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
UST's ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Trench/Excavations 4' deep or greater ✓ ✓ ✓ ✓ ✓ ✓ ✓
Oil Water Separator ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
PRECAUTIONS
(1) Clarifiers, contact Tanks and aeration tanks being taken out of service (i.e., being cleaned) they shall be entered only with gas meters and attendants. After cleaning, these tanks do not have the potential to contain a hazardous atmosphere; therefore they are not confined spaces and they may be entered without atmospheric monitoring or attendant as long as 2 workers are present at all times.
Potentially Hazardous Places Including CONFINED SPACES AS PER 29 CFR 1910.146(b) and LAB 1402.02
G:\Group\COMMON\Safety\Master Safety File\Safety Manual\Safety Manual 2014\Section 7 Confined Space\Figures 7-2, 7-3 Final Approved 0320114_JCR_Rev.060514_JCR
(5) On Primary Digesters with ramps. When making
Operations inspections or performing minor adjustments requiring less than 15 minutes, no checklist is required. For
Maintenance Inspections or other work expected to last longer than 15 minutes, a checklist is required. Using the ladder on Digesters requires a check list. (Confined Space)
(4) When set up of tripod is not feasible, use of harness and lanyard may be substituted. Whenever lanyard and harness are used, 2 attendants must be present.
Figure 7.1
FRANKLIN COMPOUND
(2) Digesters being entered after cleaning or painting have the potential for low oxygen, toxic fumes, etc. and shall be entered only with mechanical ventilation (i.e. blowers).
Subsequent entry to these tanks may be made without mechanical ventilation, but continuous gas monitoring and an attendant are required. Once at the floor of the digester, an entrant may disconnect from the tripod cable.
(3) In addition to locations noted, blowers shall be employed in any location which, upon testing shows low oxygen, or hydrogen sulfide. BLOWERS MUST NEVER BE USED in a situation where LEL is reading at or greater than 100 percent, since adding air to such an atmosphere will increase the potential for explosion.
POTENTIAL HAZARDS
P rm it R e q u ir e d
C h e c k lis t R e q u ir e d
L o w
O x y g e n S e e N o te
F ir e
E x p lo s io n
T o x ic
G a s e s S e e N o te
F a lls
M o v in g M a c h in ry
E n g u lf m e n t
D ro w n in g
F a lli n g O b je c ts
G a s M e te r
H a rn e s s
T ri p o d /D a v it A rm S e e n o te
H a rn e s s
L a n y a rd
B lo w e rs
S e e n o te
H a rd
H a t
S a fe ty A tt e n d a n t
C o m p lia n c e w
/L a b
.2
Flow channels ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Pump station lower wet well See note (1) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Manholes See note (2) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Catch basin sumps 4' deep or greater ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
River crossing valve boxes ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Water meter vault ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Influent splitter box ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Clarifiers - bottom ✓ ✓ ✓ ✓
Clarifiers - launders ✓ ✓ ✓ ✓ ✓
Contact tank, down inside ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Trench/Excavations 4' deep or greater ✓ ✓ ✓ ✓ ✓ ✓ ✓
Laconia Admin Building lower level ✓ ✓ ✓
NOTES:
G:\Group\COMMON\Safety\Master Safety File\Safety Manual\Safety Manual 2014\Section 7 Confined Space\Figures 7-2, 7-3 Final Approved 0320114_JCR_Rev.060514_JCR
(1) The portion of the structure not accessible by stairs would be entered only when the wet well has been drained.
(2) In addition to locations noted, blowers should be employed in any location which, upon testing, shows low oxygen, or hydrogen sulfide. BLOWERS MUST NEVER BE USED in a situation where LEL is reading at or greater than 100 percent, since adding air to such an atmosphere will increase the potential for explosion.
(3) When set up of tripod is not feasible, use of harness and lanyard may be substituted with 2 attendants present.
Figure 7.2
LACONIA COMPOUND
POTENTIAL HAZARDS PRECAUTIONS
Potentially Hazardous Places Including CONFINED SPACES AS PER 29 CFR 1910.146(b) and LAB 1402.02
Figure 7.3
POTENTIAL HAZARDS PRECAUTIONS
P e rm it R e q u ir e d
C h e c k lis t R e q u ir e d
L o w
O x y g e n S e e N o te
F ir x p lo s io n
T o x ic
G a s e s S e e N o te
F a lls n g u lf m e n t
D ro w n in g
F a lli n g O b je c ts
T ra ff ic
S e e n o te
G a s M e te r
H a rn e s s
T ri p o d /D a v it A rm S e e n o te
H a rn e s s
L a n y a rd
B lo w e rs
S e e n o te
H a rd
H a t
S a fe ty A tt e n d a n t
O ra n g e v e s ts
S ig n s a n d C o n s
C o m p lia n c e w
/L a b
.2
Sewer Manholes See notes (1) & (3) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Drain manholes See notes (1), (3) & (4) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Catch basin 4' deep and greater ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Metering chambers 4' deep and greater See note (1) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Siphon chambers ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Carbon air filters (inside) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Pump stations lower wet well ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Smith Road p.s. - wet side See notes (2) & (3) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Smith Road p.s. - dry side see notes (5) ✓ ✓ ✓ ✓ ✓ ✓ ✓
Lower Bay Road p.s. - wet side See notes (2) & (3) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Lower Bay Road p.s. - dry side See notes (5) ✓ ✓ ✓ ✓ ✓ ✓ ✓
Pressure reducing valve chamber ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Belmont p.s. - wet side See notes (2) & (3) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
Belmont p.s. dry side below grade ✓ ✓ ✓ ✓ ✓
Trench/Excavations 4' deep and greater See note (1) ✓ ✓ ✓ ✓ ✓ ✓ ✓ ✓
NOTES:
G:\Group\COMMON\Safety\Master Safety File\Safety Manual\Safety Manual 2014\Section 7 Confined Space\Figures 7-2, 7-3 DRAFT NF 121120
(5) For the dry sides at Smith Road and Lower Bay Road Pump Stations: These locations have been determined to not pose an atmospheric hazard, thus a confined space entry permit is not required. The use of a davit arm/ harness & tripod may be implemented under the discretion of the attendant working at these locations if the attendant does not feel comfortable entering these locations without additional safety equipment.
(4) When set up of tripod is not feasible, use of harness and lanyard may be substituted with 2 attendants present.
(3) Blowers shall be employed in any location which, upon testing, shows oxygen, or hydrogen sulfide. Blowers shall also be used at Pump Stations
(p.s.) when the installed ventilation system is non-functional. BLOWERS MUST NEVER BE USED in a situation where LEL is reading at or near 100 percent, since adding air to such an atmosphere will increase the potential for explosion. Oxygen deficiency is not a potential hazard provided that ventilation system is kept in operation.
Potentially Hazardous Places Including CONFINED SPACES AS PER 29 CFR 1910.146(b) and LAB 1402.02
OTHER LOCATIONS
(1) Traffic hazards exist primarily for the entry attendant(s), and for vehicles when structures are located on the traveled way.
(2) The portion of the structure not accessible by stairs would be entered only when the wet well has been drained.
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