B09-Amd2-MA-Truro_CCNS_25KG_Inground_05_10_16_Report_(1)_0002.pdf

Utility Service Group Merithew Service Center

128 Elm St

Bridgewater, MA 02324

508-279-9965

508-279-9948 Fax

CCNS Truro Tank 25,000 Gallon Inground Storage Tank Inspection Report

Cape Cod National Seashore, Truro, MA

Prepared For:

Nicole Taylor

Program Manager

99 Marconi Site Road

Wellfleet, MA 02667

Inspection Performed May 10th, 2016

Cape Cod National Seashore, Eastham, MA

Coast Guard 25KG Inground Concrete Tank

TANK DATA

TANK NAME: Truro Tank

TANK DESIGN: Inground CONSTRUCTION TYPE: Concrete

LOCATION: 10 Head of Beech Road

CITY: Truro STATE: MA

CAPACITY: 25,000 gallons HEIGHT: 8‘ DIAMETER: 20’ x 25‘

BUILDER: Neenah Foundry Co. YEAR: NA CONTRACT # NA

EXT. COATING: Only along steel manhole assembly LEAD: NR CHROMIUM: NR

INT. COATING: No interior coatings LEAD: NA CHROMIUM: NA

INSPECTOR(S): MA Service Center DATE: 5/10/16

SUMMARY

The concrete surfaces along the interior surfaces of the subject tank are still in very good to excellent condition with no appreciable degradation or cracking evident. The only immediate concern was a ~2” x 4” hole within the patching material used to reform the area surrounding the steel I-beam after its installation. Any and all loose material should be removed and the area resealed with a non-shrink, nonmetallic high strength patching material to prevent any infiltration of dirt, vegetation, water, or rodents. Once the area is patched and cured, consideration should be given to additionally sealing this area with a 100% solids epoxy coating in order to enhance the serviceable life of the patched area.

The interior ferrous metal surfaces inclusive but not limited to the steel I-beam assisting in the support of the roof as well as the fill line and drainage lines are experiencing significant coating failure and subsequent rust formation. This deterioration has not resulted in any significant metal loss of the affected surfaces to date, however consideration should be given to cleaning and recoating these surfaces as soon as feasible or at such time as the hole along the I-beam surfaces is addressed.

The coatings along both the exterior and interior surfaces of the roof hatch assembly are exhibiting extensive failure resulting in the exposure of the underlying steel surfaces, medium to heavy rust formation, and localized areas of metal loss. In order to preserve the integrity of these surfaces consideration should be given to cleaning and recoating these surfaces as soon as feasible to do so.

EXTERIOR COATING RECOMMENDATIONS

All metal surfaces along the exterior of the roof hatch assembly inclusive of but not limited to the neck, flange, cover, and locking mechanism should be either abrasive blast cleaned to an SSPC-SP #6

Commercial blast grade or power tool cleaned to SSPC-SP #11 standards, followed by the application of (2) coats of a surface tolerant epoxy primer applied at 4.0-6.0 mils per coat and (1) of a polyurethane finish coat applied at 2.5 to 3.5 mils. Please be advised that paint samples along the roof hatch assembly were not procured for testing and that the presence of lead based paint in suspected, therefore special precautions should be exercised during the removal of the existing coatings.

Cape Cod National Seashore, Eastham, MA

Coast Guard 25KG Inground Concrete Tank

INTERIOR COATING RECOMMENDATIONS

All metal surfaces along the interior of the tank (inclusive of the inboard surfaces of the hatch assembly) should be abrasive blast cleaned to an SSPC-SP #10 Near-white metal grade followed by the application of (1) coat of an NSF approved zinc filled urethane primer applied at 2.5-3.5 mils and (1) coat of an NSF approved 100% solids epoxy coating applied at 25-30 mils. All materials should be applied in accordance with manufactures recommendations.

SANITARY RECOMMENDATIONS

The roof hatch currently lies at ground level and is therefore susceptible to water infiltration due to puddling and/or snow. Therefore, consideration should be given to extending the neck of the roof hatch assembly up at least 12” or possible re-grading the surrounding are to allow for proper drainage away from the hatch.

At such time as the roof hatch surfaces are clean and painted, consideration should also be given to installing a bolting flange to the opening of the overflow/vent so as to allow for a stainless steel fine mesh screen to be bolted into place.

STRUCTURAL RECOMMENDATIONS

It was determined that the overflow pipe shares common duties as the drainage pipe and the air vent of the subject tank. These functions should be separated with the air vent acting independently of the overflow. This could involve modification of the overflow pipe assembly or the installation of a vent assembly into the existing roof hatch, similar to the vent assembly on the Coast Guard 25KG Tank.

WATER STORAGE TANK CONDITION ASSESSMENT REPORT

Utility Service Group

Merithew Service Center

128 Elm St Bridgewater MA 02324

508-279-9965 Fax: 508-279-9948

Date: 5/10/16 Project: 134370 Task: 1.01

Tank Name: Truro Concrete Tank

Address: 10 Head of Beech Rd City: Truro State: MA

County: Barnstable Lat: N 41° 50.615' Long: W 069° 56.880'

Capacity: 25,000 gallons Tank Type: Inground Construction: Concrete % Inground: 100%

Height: 8' Diameter / Dimensions: 20' x 25' Yr Built: NA By: Neenah Foundry CO. Contract: NA

Exterior Last Painted: NA Exterior Color: NA Interior Last Painted: NA Interior Color: NA

Exterior Roof Conditions: All questions are Yes / No / NA / NR unless listed (G/F/P) for Good / Fair / Poor / NA / NR

Tank Area Item of Concern Status Comments

Roof Surfacer visual assessment? (G/F/P) NR Coating Type: NR Lead Bearing: NR DFT: NA

The entire tank is buried below grade therefore the condition or existence of exterior coatings could not be determined at this time.

Coating or Actionable checking / delamination? NR

Surfacer Actionable deterioration / efflorescence? NR

Is there any graffiti paint or etchings? No

Coating adhesion assessment? (G/F/P) NR

Does soiling impact visual appearance? Yes

Roof seam sealer condition (G/F/P)? NR

Roof Structural visual assessment? (G/F/P) NA As stated above, the entire tank is buried below grade therefore the exterior surfaces of the tank were not available for visual inspection. The only exception is the raised neck surrounding the roof access hatch which appeared to be in generally good condition with only minor surface degradation evident.

Structure Significant cracking / bug holes evident? NR

Significant spalling evident? NR

Significant exposed rebar? NR

Unsealed penetrations to WC present? NR

Is the roof perimeter watertight? NR

Roof Vent Design meets state standards? No Finial Stub OD: 3"

No independent air vent was detected. It is suspected that the overflow/drain pipe also serves as the vent. The opening of the overflow pipe is screened, however it is located only 2" above grade.

Screen intact? Yes

Vacuum pallet functional? NA

Unsealed penetrations present? No

Roof At least two hatches to WC present? No The roof of the tank is equipped with a single 20.5" by 21" hatch cover which has downward overlapping edges which fit over the raised steel neck embedded within a raised concrete neck. The cover is then secured in place by means of a steel bar which passes through (2) steel eyebolts embedded in the concrete neck and is locked in place at one end. The roof assembly appears to be structurally sound and in good sanitary condition, although the hatch is almost flush with the surrounding grade and could be susceptible to water intrusion due to puddling and/or snow load.

Access Primary meets state standards? Yes

Additional meet state standards? NA

All roof access points secured? Yes

Ground level access >24” above grade? No

Roof Is there a roof ladder / stair present? No The roof is at ground level with no stairs of ladders required to gain access to the exterior of the roof hatch. Safety Is there a guardrail system present? No

Required fall arrest system present? NA

Tank access inside a secured structure? No

Exterior Shell Conditions: All questions are Yes / No / NA / NR unless listed (G/F/P) for Good / Fair / Poor / NA / NR

Tank Area Item of Concern Status Comments

Shell Surfacer visual assessment? (G/F/P) NR Coating Type: NR Lead Bearing: NR DFT: NA

As stated above, the entire tank is buried below grade therefore the condition or existance of exterior coatings could not be determined at this time.

Coating or Actionable checking / delamination? NR

Surfacer Actionable deterioration / efflorescence? NR

Is there any graffiti paint or etchings? No

Coating adhesion assessment? (G/F/P) NA

Does soiling impact visual appearance? Yes

Is majority of the tank wall below grade? Yes

Shell Structural visual assessment? (G/F/P) NR The exterior shell surfaces were not available for inspection. There was no evidence of wet or damp areas surrounding the tank nor were there any areas of eroded soil or depressions surrounding the tank which could be a result of undermining due to leakage.

Structure Significant cracking / bug holes evident? NR

Significant spalling evident? NR

Significant exposed rebar? NR

Dome cap to shell transition? (G/F/P) NR

Is the base of the tank wall visible? No

Any active leakage observed? No

Foundation Structural visual assessment? (G/F/P) NR The shell walls and any potential foundation are below grade and therefore not visually accessible for inspection. Increased deterioration at grade? No

Any undermining evident at grade? No

Does grade promote good drainage? Yes

Evidence of unexplained standing water? No

Shell At least two manholes present? No The shell is completely below grade therefore there are no shell manholes present. Access Primary meets state standards? NA

Additional meet state standards? NA

Structural damage / leakage visible? No

Shell Required shell ladder present? No Safety Climb Type: NA

The exterior of the tank is not equipped with an access ladder nor is one required.

Safety Required safety climb system present? No

Is shell ladder equipped with a cage? NA

Are there rest platforms present? NA

Actionable corrosion / deterioration? No

Functional security gate present? NA

Do antennas / cables impact climbing? NA

Overflow Is the overflow system internal? No Pipe OD: 4"

The tank is equipped with an internal overflow which enters into the tank approximately 3.5" at an elevation of approximately 7' above the floor of the tank. The concrete lined ductil iron pipe appears structurally sound, however there is evidence of extensive medium to heavy rusting taking place along the exterior surfaces of the pipe. The overflow also appears to serve as the drain and air vent as previously referenced. The discharge opening is located approximately 100-150' from the tank is the side of a small hill. The pipe itself exits out only 2" above grade. The opening, however, is equipped with a fine mesh screen which is banded to the end of the pipe, as shown in attached photographs.

Is the overflow pipe encased in concrete? Yes

Significant cracking or efflorescence? No

Significant spalling evident? No

Is the overflow discharge above grade? NR

Required air gap present? NR

Screen is intact or was replaced? NR

Flapper is functional or was replaced? NR

Drain, spillway or rip-rap present? NR

Interior Roof Conditions: All questions are Yes / No / NA / NR unless listed (G/F/P) for Good / Fair / Poor / NA / NR

Tank Area Item of Concern Status Comments

Roof Surfacer visual assessment? (G/F/P) Good Coating Type: None Lead Bearing: NA DFT: NA

The underside of the concrete roof is not coated, but appears to be in very good condition with no appreciable degradation evident. Only isolated areas of minor surface degradation were observed. There was also evidence of patched areas along what appeared to be areas of forming bolts. These patched areas are still intact with no appreciable degradation observed.

Coating Actionable blistering / delamination? NA

Actionable deterioration / efflorescence? No

Surfacer adhesion assessment? (G/F/P) Good

Roof seam sealer condition? (G/F/P) NA

Roof to shell junction? (G/F/P) Good

Roof Structural visual assessment? (G/F/P) Good The concrete roof surfaces were found to be in very good to excellent condition with no appreciable degradation, cracking, or spalled material evident. There are no support columns, although the roof is additionally supported by (1) 8" wide by 8.5" tall steel I-beam which was noted to be in sound structural condition with no significant metal loss taking place. The coating that is protecting the beam surfaces, however, is exhibiting extensive degradation as

Structure Significant cracking / bug holes evident? No

Significant spalling evident? No

Significant exposed rebar? No

Support columns in sound condition? NA

Roof to column junctions are sound? NA well as medium to heavy rusting and is no longer providing an acceptable level of protection to the steel surfaces, particularly the top and bottom flanges.

Interior Shell & Floor Conditions: All questions are Yes / No / NA / NR unless listed (G/F/P) for Good / Fair / Poor / NA / NR

Tank Area Item of Concern Status Comments

Shell & Surfacer visual assessment? (G/F/P) Good Coating Type: None Lead Bearing: NA DFT: NA

Neither the wall or the floor are coated.The exposed concrete surfaces appeared to be in very good condition with mimimal degradation evident.

Floor Actionable blistering / delamination? NA

Coatings or Actionable deterioration / efflorescence? No

Surfacer Surfacer adhesion assessment? (G/F/P) NA

Shell & Structural visual assessment? (G/F/P) Good The concrete surfaces along the shell walls and floor are in very good condition with no appreciable degradation, cracking, or spalled concrete evident. There is a significant number of bug holes within the concrete incurred during construction however there was no evidence of any significant degradation along these surfaces. The only noticeable issue was along the top of the shell immediately adjacent to to where one end of the steel I-beam is supported.

There is a ~2" x 4" hole within the patching concrete use to seal this area after the beam was installed. There is no evidence of any moisture or vegetation infiltration noted, though this area should be sealed as soon as possible to ensure the continued sanitary condition of the tank. The shell walls were also found to be light to moderately stained from mineral deposits within the water supply. The floor surfaces were also found to be in very good condition with the exception of a hairline fracture within the floor which remains tight with no further degradation evident and several heavily corroded steel components, possible forming ties, embedded within the concrete.

Floor Significant cracking / bug holes evident? Yes

Structure Significant spalling evident? No

Significant exposed rebar? No

Column or wall conditions? (G/F/P) Good

Shell to floor junction? (G/F/P) Good

Fill line opening in sound condition? Yes

Is there a silt stop present? Yes

Is a separate floor drain present? Yes

Shell Is an interior shell ladder present? Yes Safety Climb Type: NR

The interior of the tank is equipped with a 7" section of aluminum ladder attached to the shell wall by means of (2) sets of support brackets. The ladder is intact and structurally sound, however surfaces are exhibiting heavy calcifications along the surfaces from the high water level down.

Safety Required safety climb system present? No

Actionable corrosion / deterioration? No

Internal cage or platforms present? No

Water Water quality visually acceptable? NA As previously referenced the shell walls are light to moderately stained and there was less than 1/4" of sediment remaining after the tank was drained. The sediment and remaining dirty water was removed from the interior of the tank as part of this inspection.

At such time as the subject tank is next drained, consideration should be given to chemically cleaning these surfaces in order to ensure continued good water quality.

Quality Significant staining or biofilm present? No

Significant floor sediment present? No

Is there a mixing system present? No

Is there evidence of tank infiltration? No

Root growth or soil entry evident? No

Site Conditions: All questions are Yes / No / NA / NR unless listed (G/F/P) for Good / Fair / Poor / NA / NR

Tank Area Item of Concern Status Comments

Site Is site equipped with a security fence? No The underground tank is located in a heavily wooded area with unrestricted access to the top of the tank. There was no evidence of any damage to the top of the tank or surrounding grounds and it was reported that the Parks Dept.

constantly monitors the site.

There are (2) sample taps located within an adjacent building which also houses the well head, transmission lines, valves, electrical, and pump controls.

Any signs of damage to the fence? NA

Are fence gates secured with locks? NA

Is a vault or pump house present? Yes

Sample tap onsite? Yes

Is there telemetry / SCADA onsite? No

In-ground tank roof well maintained? No

Is there non-tank pooling water onsite? No

Is there electrical service onsite? Yes

Are there power lines near the tank? No

Is there a non-tank water source onsite? Yes

Is the tank located in a coastal area? Yes

Site utility during tank rehab (G/F/P)? Fair

CCNS 25KG Inground Concrete tank located in Truro, MA

Inspection conducted 05.10.16

Showing the general location of the Truro 25KG

Underground concrete tank

Showing the Truro 25KG underground concrete tank to be completely buried below grade with only access hatch visible

Showing access hatch assembly located slightly above grade and susceptible to possible water intrusion due to puddling or snow

Showing an aluminum access ladder mounted to the shell wall directly below the roof access hatch

Tank interior: showing aluminum access ladder to be in sound structural condition and adequately secured to tank wall

Tank interior: showing extensive calcium deposits encrusted along the access ladder surfaces

Tank interior: showing no evidence of any significant degradation of the ladder surfaces

Roof interior: showing concrete surfaces to be in generally very good condition with minimal surface degradation noted

Roof interior: showing concrete surfaces to be in generally very good condition with minimal surface degradation noted

Roof interior: showing concrete surfaces to be in generally very good condition with minimal surface degradation noted

Roof interior: showing what appears to be previously patched areas to be intact with no appreciable degradation evident

Roof interior: showing the underside of the roof is not coated, however concrete surfaces are in generally very good condition

Roof interior: showing what appears to be previously patched areas to be intact with no appreciable degradation evident

Roof interior: showing evidence of small, localized areas of minor surface degradation

Roof interior: showing evidence of small, localized areas of minor surface degradation

Roof interior: showing heavily corroded penetration for water level sensors

Showing the water level sensors extending down from the underside of the roof

Roof interior: showing presence of a steel I-beam used to reinforce the roof structure. Item appears intact and structurally sound

Roof interior: showing support beam to be exhibiting extensive coating failure resulting in medium to heavy rusting

Roof interior: showing support beam to be exhibiting extensive coating failure resulting in medium to heavy rusting

Shell interior: showing spalled concrete resulting in a small void near the top of the shell wall immediately adjacent to the support beam

Roof interior: showing support beam to be exhibiting extensive medium to heavy rust and stratified rust along web and flanges

Roof interior: showing support beam to be exhibiting extensive medium to heavy rust and stratified rust along web and flanges

Roof interior: showing heavy rust and stratified rust formations along the underside of the bottom flange

Roof interior: showing junction with shell walls to be in generally good condition with no open voids evident

Roof interior: showing junction with shell walls to be in generally good condition with only minor areas of spalled concrete evident

Roof interior: showing junction with shell walls to be in generally good condition with only minor areas of spalled concrete evident

Roof interior: showing junction with shell walls to be in generally good condition with no open voids evident

Shell interior: showing no coatings along the shell walls, however the concrete surfaces appear to be in very good condition

Shell interior: showing concrete to be in very good condition, however there is light to moderate staining evident

Shell interior: showing concrete to be in very good condition, however there is light to moderate staining evident

Shell interior: showing concrete to be in very good condition, however there is light to moderate staining evident

Shell interior: showing concrete to be in very good condition with no cracking or spalled material evident

Shell interior: showing concrete to be in very good condition with no cracking or spalled material evident

Shell interior: showing concrete to be in very good condition with no appreciable surface degradation evident

Shell interior: showing concrete to be in very good condition with no appreciable surface degradation evident

Shell interior: showing concrete to be in very good condition with no appreciable surface degradation evident

Shell interior: showing presence of 4" dia. overflow pipe located approximately 7' above the floor of the tank

Shell interior: showing the interior surfaces of the overflow pipe to be cement lined and in good condition

Shell interior: showing the exterior surfaces of the overflow pipe to be exhibiting extensive medium to heavy rusting

Shell interior: showing what appears to be a fill line located approximately 5' 5" above the floor of the tank

Shell interior: showing what appears to be a 2" diameter fill line which is flush with the inside of the shell wall

Shell interior: showing what appears to be a fill line from the well which is exhibiting heavy corrosion along the interior surfaces

Floor: showing the presence of a drainage sump and line

Floor : showing the drainage sump to be 12" x 12" and in sound structural condition

Floor: showing the drainage sump to be approximately

2.5" in depth with the drainage pipe slightly recessed from the top of the sump

Floor: showing the drainage line located within the sump to be heavily corroded

Floor: showing opening of outlet line to be 6" in diameter however it reduces to a 4" diameter pipe.

Floor: showing opening of outlet line to be 5" above the floor surfaces

Floor: showing both exterior and interior surfaces of the outlet line to be heavily corroded

Floor: showing extent of sediment and residual water left on floor after initial draining

Floor: showing extent of sediment and residual water left on floor after initial draining

Floor surfaces: showing surfaces after all residual sediment and water was removed

Floor surfaces: showing surfaces after all residual sediment and water was removed

Floor surfaces: showing surfaces after all residual sediment and water was removed

Floor: showing concrete surfaces to be in generally very good condition with minimal degradation evident

Floor: showing concrete surfaces to be in generally very good condition with minimal degradation evident

Floor: showing junction with shell walls to be tight with no evidence of degradation, open voids, or leaks evident

Floor: showing junction with shell walls to be tight with no evidence of degradation, open voids, or leaks evident

Floor: showing evidence of a hairline fracture within the floor that remains tight with no evidence of water transmission

Floor: showing concrete surfaces to be in very good condition with no appreciable degradation evident

Floor: showing concrete surfaces to be in very good condition with no appreciable degradation evident

Floor: showing remnants of heavily corroded steel embedded within concrete, possibly forming material

Floor: showing remnants of heavily corroded steel embedded within concrete, possibly forming material

Showing open roof hatch and junction box for water level sensors

Roof hatch: showing scattered coating failure and resulting surface corrosion along underside of cover

Roof hatch: showing extent of coating degradation and resulting surface corrosion along exterior of cover

Roof hatch: showing cover repositioned back in place and locked upon completion of internal inspection

Site: showing a secondary manhole assembly leading to a pit which houses a transfer line and valve

Site: showing the neck of the pit constructed with cement blocks which appear in good condition

Site: showing no vegetation infiltration along the neck of the pit

Site: showing pit housing a transfer line with valve, both of which appear to be in good condition

Showing heavy cast iron manhole cover to be in very good condition and difficult to handle

Showing manhole cover set back into place upon completion of inspection

Site: showing combination overflow and floor drain discharge opening approximately 100-150' from tank

Site: showing discharge opening of overflow/drain pipe secured with screening banded into place

Site: showing building constructed to house well head, miscellaneous piping, and vavles

Site: showing side chamber which actually houses the well head and some of the transmission lines

Site: showing side chamber with cover off. There is typically a wooden cover which is locked in place over the top of this chamber

Site: showing the well head located within the side enclosure

Site: showing the transmission lines located within the side enclosure

Site: showing small building housing piping, valves controls, and electrical components

Site: showing hose connections along transmission lines allowing site access to water and possible sampling points

Site: showing transmission line with meter and shutoff valve located within building

Site: showing electrical panel and outlets as well as control panel located within building

Site: showing unrestricted access to tank site

Tank is located within a wooded area directly across the street from a campground parking lot