B09-Amd2-MA-Eastham_CCNS_Coast_Guard_25KG_Inground_06_20_16_Report_0002.pdf

Utility Service Group Merithew Service Center

128 Elm St

Bridgewater, MA 02324

508-279-9965

508-279-9948 Fax

CCNS Coast Guard Tank 25,000 Gallon Inground Storage Tank Inspection Report

Cape Cod National Seashore, Eastham, MA

Prepared For:

Nicole Taylor

Program Manager

99 Marconi Site Road

Wellfleet, MA 02667

Inspection Performed May 9th and June 20th, 2016

Coast Guard 25KG Inground Concrete Tank

TANK DATA

TANK NAME: Coast Guard Tank

TANK DESIGN: Inground CONSTRUCTION TYPE: Concrete

LOCATION: 2 Ocean View Drive

CITY: Eastham 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: CHROMIUM:

INT. COATING: Only along steel components LEAD: CHROMIUM:

INSPECTOR(S): MA Service Center DATE: 6/20/16

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. In fact, the referenced surfaces appeared to be in almost identical condition as was observed during out last inspection of 1999.

Therefore, no concrete repairs or maintenance is required at this time or anticipated for at least an additional (5) more years. The only concern regarding the concrete surfaces was the heavy mineral staining along the shell walls. At such time as the subject tank is dewatered again for either assessment, sediment removal, or maintenance of various ferrous metal components, in order to help ensure the good water quality consideration should be given to chemically cleaning the interior shell walls in an effort to remove all heavy staining.

The interior ferrous metal surfaces inclusive but not limited to the steel I-beam assisting in the support of the roof, the embedded ladder rungs, fill line, and drainage lines are experiencing significant coating failure and subsequent rust formation, however this deterioration has not resulted in any significant metal loss of the affected surfaces to date. Nevertheless, consideration should be given to cleaning and recoating these surfaces as soon as feasible to do so in order to preserve the structural integrity of the referenced items and prevent any furtherance in metal loss of already exposed surfaces.

The only exterior concrete surfaces visible during this inspection was the raised concrete neck surrounding the roof access hatch assembly. These surfaces were exhibiting significant surface degradation, cracking, and spalled material particularly along the immediate peripheral of the neck flange of the steel roof hatch. These surfaces should be repaired as soon as feasible to do.

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 and medium to heavy rust formation as well as 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.

Coast Guard 25KG Inground Concrete Tank

EXTERIOR COATING RECOMMENDATIONS

All metal surfaces along the exterior of the roof hatch assembly inclusive of but not limited to the neck flange, cover, locking mechanism, and gooseneck vent 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 is suspected, therefore special precautions should be exercised during the removal of the existing coatings.

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 manufacturer’s recommendations.

SANITARY RECOMMENDATIONS

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 vent so as to allow for a stainless steel fine mesh screen to be bolted into place.

STRUCTURAL RECOMMENDATIONS

All loose concrete should be removed from the top of the raised concrete neck surrounding the roof hatch assembly and then pretreated to enhance interfacial bonding between existing concrete and the resurfacing material. The top of the raised concrete neck should then be resurfaced with the finish concrete emanating out from the underside of the manhole neck flange and sloping down to the outer edge of the raised neck. Once completed and cured the referenced surfaces should be resealed with a waterproof material. The junction between the steel flange of the hatch and the concrete neck should then be additionally sealed with an elastomeric caulking. All repair work should be performed after the steel surfaces of the hatch assembly have been cleaned and recoated.

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: 6/20/16 Project: 134368 Task: 1.01

Tank Name: Coast Guard Tank

Address: 2 Ocean View Drive City: Eastham 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. 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? Yes Finial Stub OD: 3"

The roof hatch assembly is equipped with a 3" Ø goose neck style vent which was found to be intact and structurally sound. The opening of the vent is approximately 4.5" above the cover and is sealed with a fine mesh fiberglass screen which is banded into place.

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 18.5" x 18.5" hatch cover which has downward overlapping edges which fit over the raised steel neck and flange assembly embedded within a concrete neck. The cover is then secured in place by means of a steel bar which passes through (2) steel retention clips and is locked in place at one end. The roof assembly appears to be structurally sound and in good sanitary condition, however the concrete surrounding the hatch assembly is exhibiting significant degradation.

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 or 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: 5"

The tank is equipped with an internal overflow which enters into the tank approximately 7" at an elevation of approximately 85" above the floor of the tank. The concrete lined ductil iron pipe appears structurally sound, although there is evidence of scattered corrosion taking place along the exterior surfaces of the pipe.

The exterior discharge point was not identified during this inspection.

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 corrosion were observed along what appeared to be areas of forming bolts.

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" x

10" steel I-beam which was noted to be in sound structural condition with no significant metal loss taking place. However, the black coal tar coating that is protecting the beam surfaces is exhibiting extensive degradation as well as medium to heavy rusting and is no longer providing an acceptable level of protection to the steel surfaces.

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

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 material evident. There is a significant number of bug holes within the concrete incurred during construction, however there was no evidence of any degradation along these surfaces.

The shell walls were found to be heavily stained from mineral deposits within the water supply.

The ductil iron fill line enters in from the shell and then extends down to within

4" above the floor surfaces as shown in attached photographs. The fill line appears intact and structurally sound, however it is experiencing localized areas of heavy rusting.

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? NA

Is a separate floor drain present? No

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

There is a set of embedded ladder rungs located within the shell wall just below the roof access hatch. The rungs are intact and structurally sound, although they are exhibiting heavy rusting along 100% of their surfaces.

Safety Required safety climb system present? No

Actionable corrosion / deterioration? Yes

Internal cage or platforms present? No

Water Water quality visually acceptable? No As previously referenced the shell walls are heavily stained and as much as 12" of sediment was found along the floor surfaces. 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? Yes

Significant floor sediment present? Yes

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 on a state beach with public access to the top of the tank. There was no evidence of any damage to the top of the tank or surrounding grounds and the Parks Dept. constantly monitors the site.

There is a sample tap located within a shallow pit which is sealed by a steel collar and manhole cover and is located in between the tank and the well heads.

There is no electrical service at the tank, however there is at the visitor center building immediately adjacent to the tank.

Any signs of damage to the fence? NA

Are fence gates secured with locks? NA

Is a vault or pump house present? No

Sample tap onsite? Yes

Is there telemetry / SCADA onsite? No

In-ground tank roof well maintained? Yes

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? No

Is the tank located in a coastal area? Yes

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

CCNS Coast Guard 25KG Inground tank located in Eastham, MA

Inspection conducted 06.20.16

Showing visitor center immediately adjacent to the tank site

Showing actual location of underground tank

Showing both roof hatch and manhole cover to sample tap pit open to permit inspection

Showing sample tap located at the bottom of the shallow pit to be in good condition and visually functional

Showing (1) of (2) well heads located adjacent to the underground tank

Showing 2nd of (2) well heads located adjacent to the underground tank

Showing the presence of a water main shut off valve Showing sediment in the process of being removed from the interior of the tank

Showing significant surface degradation along the concrete neck of the roof hatch

Showing roof hatch and vent assembly to be in good structural and sanitary condition

Showing the finial vent assembly located within the roof hatch cover

Showing the opening of the roof vent sealed with a fine mesh screen which is banded into place

Showing extensive coating degradation along the roof hatch cover and neck assembly

Showing access rungs embedded within the shell wall of the concrete tank

Showing extent of residual water and sediment within the tank prior to removal

Showing extent of sediment within the tank prior to removal

Showing sediment within the tank being removed by a vacuum truck

Showing extent of sediment within the tank prior to removal

Showing sediment completely removed from the interior of the tank and the presence of a sump and floor drain

Underside of roof: showing concrete surfaces to be in very good condition and additionally supported by a steel beam

Underside of roof: showing both concrete surfaces and steel beam to be in sound structural condition

Underside of roof: showing both concrete surfaces and steel beam to be in sound structural condition

Underside of roof: showing extensive coating degradation and rusting taking place along steel beam

Underside of roof: showing extensive coating degradation and rusting along bottom flange of steel beam

Underside of roof: showing medium to heavy rusting along penetration for sensors

Shell interior: showing concrete surfaces to be in sound structural condition however heavily stained

Shell interior: showing concrete surfaces to be in sound structural condition however heavily stained

Shell interior: showing presence of a fill line which appears intact and structurally sound

Shell interior: showing presence of a fill line which appears intact and structurally sound

Shell interior: showing presence of a fill line which is exhibiting localized coating failure and medium to heavy rusting

Shell interior: showing presence of a fill line which is exhibiting localized coating failure and medium to heavy rusting

Shell interior: showing presence of a fill line which is discharging approximately 4" above the floor

Floor: showing the concrete surfaces and the floor of the tank to be in very good condition

Shell interior: showing overflow pipe to be in sound structural condition

Overflow: showing overflow pipe extending out of the shell wall approximately 7" and exhibiting scattered medium to heavy rusting

Overflow: showing pipe to be cement lined and with approximately a 3.5" inside diameter

Overflow: showing bottom of overflow pipe to be approximately 85" above the floor of the tank

Showing additional steel pipe penetrating the shell wall and exhibiting medium to heavy rusting

Showing additional steel pipe to be approx. 2" in diameter and exhibiting extensive corrosion along the interior of the pipe

Showing water level indicator sensors present and intact

Showing water level indicator sensors present and intact

Roof hatch assembly: showing coatings along the underside of the cover to be in very poor condition

Showing roof hatch cover repositioned back into place and secured with locking bar

Showing the locking bar of the roof hatch secured in place with a padlock upon completion of inspection

Showing manhole cover placed back over the sample tap pit upon completion of inspection