final report maintenance inspection - gwp17.comgwp17.com/aaa 2... · final report maintenance...

P. O. Box 801357, Santa Clarita, CA 91380 877.274.2422

FFiinnaall RReeppoorrtt MMaaiinntteennaannccee IInnssppeeccttiioonn

900 Metro Center Fire Suppression Reservoir

Prepared for: James Meeks Walschon Fire Protection Inc. 1015 Terminal Way San Carlos, CA 94070 Prepared by: _________________ Pat Sweeney Project Manager CSI Services, Inc. April 18, 2016

CSI Services, Inc. Allegiant Technical Services, Inc.

Hawaiian Office: P.O. Box 671, Aiea, HI 96701 Northern California Office: P.O. Box 370, Sonoma, CA 95476

P. O. Box 801357 Santa Clarita, CA 91380 Phone: 877.274.2422 Fax: 661.775.7628 www.CSIServices.biz

Providing Quality Technical Services to the Coating Industry

Hawaiian Office: P.O. Box 671, Aiea, HI 96701 Northern California Office: P.O. Box 371, Sonoma, CA 95476

Coating Specialists and Inspection Services, Inc. Consulting Evaluations Tank Diving Inspection

Table of Contents

Introduction………………………………..………….………… Page 1

Summary……………………………………..…………..……… Page 1

Background…………………………………..……….…...…… Page 1

Field Evaluation.……………………………..…….…...………

Discussion…..…………………………………………..……… Page 4 Recommendations……………………………..………...…… Page 5

Attachments

- Field Notes - NFPA 25 Report - Exterior Photos - Interior Photos - CSI Chart 1 – General Description of Conditions - CSI Chart 2 – Rust Grade Criteria - CSI Chart 3 – Corrosion Grade Criteria for Concrete - CSI Chart 3A – Corrosion Grade Criteria - CSI Chart 4 – Coating Chalking Criteria - CSI Chart 6 – Coating Blistering Criteria

Maintenance Inspection Fire Suppression Reservoir, 900 Metro Center Blvd., Foster City

Walschon Fire Protection Page 1

April 18, 2016

Introduction Walschon Fire Protection Services authorized CSI Services, Inc. (CSI) to conduct a maintenance inspection on a firewater storage tank in the Visa building located 900 Metro Center Boulevard in Foster City, CA. The inspection was made in accordance with the applicable requirements of National Fire Protection Association (NFPA) Standards for Water Tanks for Private Fire Protection (NFPA 22), NFPA Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems (modified NFPA 25), American Water Works Association (AWWA) Standard D110 "Wire- and Strand-Wound Circular, Prestressed Concrete Water Tanks" AWWA D115 "Tendon-Prestressed Concrete Water Tanks", AWWA M42 “Steel Water Storage Tanks", and CSI's experience evaluating hundreds of water storage facilities. The field-work was completed on April 5, 2016 by inspection technician Mel Smith. The exterior observations were limited to areas of the tank wall that were exposed. The interior inspection was carried out with the tank mostly drained. Mr. Pat Sweeney, Project Manager, reviewed the results of the field data and prepared this report. Mr. Sweeney is a Certified Level 3 SSPC and NACE inspector, an SSPC Certified PCS, and has evaluated over 500 water storage tanks.

Summary The exterior of the tank was found to be in good condition with no notable defects that would require repair. The tank interior lining is in poor condition with large patches of blisters present. The lining should be replaced. In order to defer the relining of the tank, it is recommended that the lining be mechanically scraped to removed all loose coating, which otherwise could create an issue with the proper operation of the fire prevention system.

Background

The fire suppression reservoir is a rectangular, flat-bottom, cast-in-place concrete tank that sits within the high-rise building and is located within a 15 foot by 25 foot area. The tank is approximately 12 feet high, providing a nominal capacity of approximately 14,687 gallons. The overflow height is 10 feet. The tank has a concrete deck roof that is supported by the tank walls. The tank has a steel inlet/outlet and overflow that enter the tank through the walls. The outlet has an anti-vortex plate with 6 3/4 inch clearance from the floor. The exposed exterior surfaces of the tank are painted with what appears to be an acrylic coating, while its external piping appears to be painted with alkyd based paint system. The interior concrete surfaces of the tank are coated with an elastomeric lining. Some of the internal piping is galvanized.



April 18, 2016

Field Evaluation

The purpose of this survey was to assess the conditions of the visible substrate and coatings to recommend remedial work, where applicable. The evaluation primarily involved visual observations to the surfaces above water level, while underwater surfaces were only tactically inspected due to murky water and sediment build-up. Photographs and video was taken to document the field inspections. A photo summary is included with this narrative report. For survey purposes, the tank evaluation has been segmented into defined areas: exterior wall, interior roof, interior wall, and interior floor. The various appurtenances within each of these areas have also been evaluated. A rating system has been developed to quantify the condition of the various tank areas. Each of the rating criteria is found in the Attachments (Charts 1 to 4). The condition of the coating system(s) was rated as being poor, fair, good, or excellent (Chart 1). The extent of any rust defects identified within each of the areas were generally determined using guidelines set forth in ASTM D610 “Standard Test Method for Evaluating the Degree of Rusting of Painted Steel Surfaces” (Chart 2). Where applicable, the characteristic or stage of corrosion was determined according to CSI Corrosion Grade criteria (Chart 3 and Chart 3A). Any blistering that may have been present was rated in accordance with ASTM D714 “Standard Test Method for Evaluating the Degree of Blistering in Paints” (Chart 6). The result of the evaluation follows: Exterior Close-up visual observation of the exterior was limited to the exposed area of the walls and roof. Exterior coatings are present on the tank walls, roof, the various piping and operational equipment installed on the tank. The paint on all areas was found in good condition with a negligible amount of chalking (ASTM D4214, No. 8). The roof area appears to be in good condition, but a thick layer of dust covers most of the roof. Hairline cracks was present throughout the roof. The specific observations for each roof quadrant are made below.

North: No notable comment.

West: No notable comment.

South: No notable comment.

East: No notable comment. The coating on the shell was in good overall condition. A minor amount of cracking and bug-holing is present on the shell, but no indication of leakage or corrosion was identified. The specific observations for each shell quadrant are made below.



April 18, 2016

North: Slight bug-holing is present. Some cracking is present where the northwest tank meets the wall.

West: Light bug-holing is present.


East: Slight bug-holing is present cracks are present in the southeast tank meats the wall.

Interior The interior lining system was found to be in overall poor condition. Blistering is present within the roof lining (ASTM D714; No. 2, dense). Several of the blister's caps have cracked and are beginning to dislodge from the substrate. Some small dark rust spots are present in some locations of the upper chime. Dark rust (CSI Corrosion Grade 2) is present on the piping entering the roof. The specific observations for each roof quadrant are made below.

North: Several broken blisters with delaminations are present. Small dark rusting spots are present at the upper chime.

West: Rusting is present in the crevices of the piping. Rusting nodules are present on the underwater piping.


East: No notable comment.

Large patches of blisters are present throughout the shell (ASTM D714; No. 2, dense). Some of the blister caps have broken free of the wall. There some rusting spots within the concrete surface and with nodules developing in isolated areas (CSI Corrosion Grade 2). The specific observations for each shell quadrant are made below.

North: Dense blistering is present throughout the quadrant (2-6, dense). Rusting nodules are present at some broken blisters.

West: Dense blistering with nodules are present scattered throughout the shell (2-6, dense). A few large nodules are present on the shell.

South: Dense blistering is present, but no nodules are present (2-6, dense).

East: Dense blistering is present throughout the quadrant (2-6, dense). Rusting nodules are present on some broken blisters.



April 18, 2016

The floor was inspected by feel (tactically) since approximately 3 inches of water and sediment was present on the floor. The floor lining was found to have numerous large blistered patches (ASTM D714; No. 2, dense). Areas of the lining also had locations with disbondment. The disbonded areas ranged in size from 6 inches to 1 foot in surface area. Lining disbondment was also noted to be present under the anti-vortex plate. The specific observations for each floor quadrant are made below.

North: No notable comment.

West: The anti-vortex plate is secure. Rusting nodules are present.


East: No notable comment.

Discussion The exterior of the tank was rated to be in good condition with no notable defects that would require repair. Some areas did have some small cracks, but each of these conditions was considered normal and not a symptom of any issues. The paint on the exterior pipe was also found to be satisfactory with no maintenance needs. The tank interior lining is in poor condition with large patches of blisters present in most locations, and some of the blister caps are disbonding from the concrete substrate. There were also some localized rusting nodules on the concrete. It is believed that these corroding spots in the concrete are a result of casting fasteners (e.g. staples, nails, etc) that were not removed before the tank was lined. The blisters are a result of osmotic forces. Osmotic blistering is typically caused when coatings that are to be placed into immersion service are applied too thick, overcoated too soon, under colder weather conditions, and/or over contaminated surfaces. One form of osmotic blistering is solvent entrapment. Solvents are added to coatings to act as a vehicle during application. When coatings are applied too thick the coating solvents that were designed to be released during application are locked in-place when the catalyzed coating reaches a full chemical cure. Additionally, if coatings are applied under cold or cooler conditions, the solvents have a difficult time escaping from the film before it gets hard. Blisters that result from solvent entrapment tend to be localized to the coolest and lowest areas of a tank. Solvent vapors are typically heavier than air, and the lowest portion of a tank tends to become saturated with these gases without proper ventilation at the time of application. Coated over contamination creates a source for osmotic forces. This



April 18, 2016

contamination attracts fluid that creates pressures that exceed the film's ability to bond, creating blisters. There is no immediate concern with respect to the tank structure properly providing water storage; however, the internal lining has locations where the lining is disbonding. This raised concerns that these pieces could enter the piping system in the event of pump operation. The lining has failed and should be replaced. In order to defer the concern of lining fragments entering the piping in the near-term, it is suggested that the coating system be scraped of all loose lining. The newly applied lining should also be applied to the piping that is present within the structure.

Recommendations The following work should be completed to ensure proper tank operation: 1) Scrape all internal loose lining from the tank surfaces. 2) Abrasive blast clean all internal concrete surfaces of the tank in accordance with

Surface Preparation of Concrete (SSPC-SP13) followed by the application of an immersion grade epoxy in accordance with the coating manufacturer's requirements.

NOTICE: This report represents the opinion of CSI Services, Inc. This report is issued in conformance with generally acceptable industry practices. While customary precautions were taken to insure that the information gathered and presented is accurate, complete and technically correct, it is based on the information, data, time, and materials obtained and does not guarantee a leak-proof tank.

The information reported was obtained using visual observations and testing believed to be accurate. The information reported represents the data obtained from the specific representative areas inspected, tested, and/or verified. © Copyright CSI Services 2007

P. O. Box 801357, Santa Clarita, CA 91380 Page 1 of 1 Phone: 877.274.2422 (toll free) Date 04-05-16 Fax: 661.775.7628 CSI Job No.: 216138

www.CSIServices.biz Completed by: Smith

In-Structure Fire Suppression Reservoir Inspection Report

Client: Walschon Fire Protection Dive Supervisor: Mel Smith Client Contact: James Meeks Diver: N/A Owner: Visa Tender: N/A Tank Name: Fire Suppression Tank Date of Last Inspection: N/A

Scope Maintenance Warranty Cleaning Patch Repairs UT Readings NFPA-25 Sampling

Parent Structure Characteristics Site Address 900 Metro Center Blvd

Dive Truck Access Access Near Reservoir

Reservoir Location Parking Garage Room Secure Yes Power Available Yes Drainage for Cleaning Vicinity of Tank

Reservoir Characteristics

Reservoir Construction On grade Vent Sealed No screening

Reservoir Geometry Rectangular Access Type Square Hatch

Number of Fire Pumps 1 Hatch Dimensions 36"x36" Type of Fire Pumps Diesel Hatch Direction Top Check Valve Present? Yes Exterior Access Ladder Anti-Vortex Plate Yes Interior Ladder None Present Overflow Design Pipe-upper course Tank Piping shell outlet Capacity Appx 14,687 gallons Inlet Diameter 2"/4" Height 12 Outlet Diameter 8" Length 25 Overflow Diameter 3" Width 10 Outlet Location Lower shell Vent Type other Water Level Monitor Water Float

The information reported was obtained using visual observations and testing believed to be accurate. The information reported represents the data obtained from the specific representative areas inspected, tested, and/or verified. © Copyright CSI Services 2007

P. O. Box 801357, Santa Clarita, CA 91380 Page 1 of 1 Phone: 877.274.2422 Date 04-04-16 Fax: 661.775.7628 CSI Job No.:

www.CSIServices.biz Completed by: Smith

NFPA 25 Fire Suppression Tank Inspection Report

Rev. NFPA 25‐2011 Edition‐California 2014 Edition Title 19

900 Metro Ceneter Blvd., Foster City, CA

Item

NFPA-25

Subsection

Data Sat Unsat N/A Comment

Water Temperature >40F 9.2.4.1 Drained

Ext Shell 9.2.5.1a Excellent Condition Satisfactory

Ext Roof 9.2.5.1.b Excellent Condition Satisfactory

Ext Support Structure 9.2.5.1.c Not applicable

Ext Vents 9.2.5.1.d Not applicable

Ext Foundation 9.2.5.1.e Not applicable

Ext Catwalk/Ladder 9.2.5.1.f Excellent Condition Satisfactory

Ext Combustible Debris against

shell 9.2.5.2(1) Unsatisfactory

Cardboard on top of tank and miscellaneous items in overflow trough

Ext Debris against Shell-

Rot/Corrosion 9.2.5.2(2) Satisfactory Satisfactory

Ext Ice Build Up 9.2.5.2(3) Satisfactory Satisfactory

Ext Surrounding Site Errosion 9.2.5.2(4) Not applicable

Ext Expansion Joint/Hoops 9.2.5.3 Not applicable

Exterior Coating Condition 9.2.5.5 Excellent Condition Satisfactory

CP Present 9.2.6.1& 2 No Not applicable

Silt Removed 9.2.6.2 No Approximately 1 inch of sediment,

debris, and torn coating on the floor Interior Corrosion

Inspection 9.2.6.3&4

Good Condition Satisfactory

Void under floor plate? 9.2.6.5 Void Present Loose coating on floor

Anti-Vortex Plate Condition 9.2.6.7 Good Condition Rusting nodules, but satisfactory

Tank Float Accuracy/Function 9.3.1 Not Functioning Pending repairs

Additional Comments: See inspection report.

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© Copyright CSI Services, Inc. 2004

Chart 1 - Condition Rating The table below gives a basic description of the four different categories that CSI Services, Inc. uses to provide a general depiction of the condition of each defined area of a structure. The categories are Poor, Fair, Good, or Excellent. The development of these categories is based on historical knowledge and experience of various substrates and paint and lining systems over given periods of time in certain service environments. Basically, the rating is determined based on what should be expected the substrate and paint or lining system at that point in its life cycle. As a result, different determinations are made for maintenance inspection versus warranty inspections. A detailed description of each rating with relative consideration addressed follows:

General Description of Conditions Rating

Maintenance Inspection Warranty Inspection

Poor

This condition is usually prioritized for rework in the short-term. Typically, these surfaces have considerably more coating defects and/or corrosion than what is expected for the age of the system. Significant rust staining from corroded reinforcing steel at cracks or spalled areas is identified. Leaks and large areas of seepage may be present.

This condition identifies an area with wholesale coating defects or corrosion concerns that will typically require significant removal and replacement of the coatings in the area.

Fair

Typically, these surfaces have a level of coating defects and/or corrosion that is slightly worse than what should be expected for the age of the system. This condition is placed on a short-term monitoring schedule. Minor rust staining of reinforcing steel from cracks or spalled areas is common. Minor indications of leaks and areas of seepage is noted.

This condition identifies an area with partial coating defects or corrosion concerns that will require significant rework.

Good

This condition is rated for areas without any considerable coating defects or reinforcing steel corrosion. These surfaces are in a condition that is typical for the age of the structure or coating system.

This condition identifies areas with coating defects or corrosion that is typically seen in one-year warranty inspections. Typically, only minor spot repairs are required.

Excellent

This condition is for areas without any considerable coating defects or corrosion. Typically, these surfaces are in a condition that is better than expected for the age of the system.

This condition identified areas that typically are in perfect condition and require no repair work.

Copyright CSI Services, Inc. 2004

Chart 2 -Rust Grade The black and white figures below depict the standards referenced in ASTM D610 “Standard Test Method for Evaluating Degree of Rusting on Painted Surfaces.” Below each standard is a photographic depiction of each level of corrosion, as used by CSI Services, Inc. The standards depict the percentage of rust on a scale from 0 to 10, with 10 having no rust and 0 having complete rust. Rust Grade 10 Rust Grade 9 Rust Grade 8 Rust Grade 7 Rust Grade 6 Rust Grade 5 Rust Grade 4 Rust Grade 3 Rust Grade 2 Rust Grade 1

Rust Grade 0

Rust Grade Description

10 No rusting or less than 0.01% of surface rusted

9 Minute rusting, less than 0.03% of surface rusted

8 Few isolated rust spots, less than 0.1% of surface rusted

7 Less than 0.3% of surface rusted

6 Excessive rust spots, but less than1% of surface rusted

5 Rusting to the extent of 3% of surface rusted

4 Rusting to the extent of 10% of surface rusted

3 Approximately one-sixth of the surface rusted

2 Approximately one-third of the surface rusted

1 Approximately one-half of the surface rusted

0 Approximately 100% of the surface rusted


Chart 3 - Corrosion Grade The figure below depicts the photographic standards referenced by CSI Services, Inc. in the determination of the characteristics and stages of corrosion progression. This standard is used to better quantify the level of corrosion of concrete and/or reinforcing steel. When applicable, CSI classifies an area as one or more of the five different Corrosion Grades. Corrosion Grades 1 through 5 follow:

Grade Description Photo Examples

1

Mild Corrosion - This condition involves relatively light colored rust on exposed rebar or surface degradation that is less than 1/4 inch in depth or isolated spalling.

2

Moderate Corrosion - This condition involves relatively dark colored rust from rebar or surface degradation that is more than 1/4 inch in depth.

3

Heavy Corrosion - Rebar is partially exposed or surface degradation is between 1/4 and 1/2 of an inch in depth. Exposed aggregate is present.

4

Severe Corrosion- Localized rebar is completely exposed and aggregate has been dislodged or substrate has more than 1/2 of an inch deep of localized degradation.

5

Structural Loss - This condition involves exposed aggregate and areas with rebar loss.

The photos depicted are examples and were not taken on this project.


Chart 3A - Corrosion Grade The figure below depicts the photographic standards referenced by CSI Services, Inc. in the determination of the characteristics and stages of corrosion progression. This standard is used to better quantify the level of corrosion once it has progressed to Rust Grades 3, 2, 1, or 0 (see Chart 2). When applicable, CSI classifies an area as one or more of the five different Corrosion Grades. Corrosion Grades 1 through 5 are described below:

Grade Description Photo Examples

1

Light Rust - This condition involves relatively light colored rust that does not have any significant metal loss.

2

Dark Rust -This condition involves relatively dark colored, thicker rust that is progressing towards the next phase, significant metal loss.

3

Pitting - This condition involves isolated or widespread deep spot corrosion (pitting).

4

Scale - Also known as lamellar or exfoliation corrosion. The edges of the affected area are leaf like and resemble the separated pages of a wetted book.

5

Structural Loss - This condition involves metal loss or failure where components will require structural consideration

The photos depicted are examples and were not taken on this project.


Chart 4 - Chalking The figure below depicts the photographic standards referenced in ASTM D4214 “Standard Test Method for Evaluating the Degree of Chalking of Exterior Paint Films,” Method D659, Method C. Generally speaking, chalking is the degradation of a paint’s binder leaving behind loose pigments as the binder reacts with the environment, primarily ultraviolet light and oxygen. Evaluating chalking is a means to measure the performance of a coating system and its life cycle projection. It is also important to quantify for consideration of future overcoating options. This test uses these pictorial standards to quantify the amount of chalking present on paint films. The depictions below represent the mount of colored chalk removed onto a cloth during the test. The scale ranges from 2 to 8 with the rating 2 having the most chalk.

Light Colored Paints

No .8 No. 6 No .4 No. 2

Dark Colored Paints No .8 No. 6 No .4 No. 2


Chart 6 – Blistering Rating The figure below depicts the photographic standards referenced in ASTM D714 “Standard Test Method for Evaluating Degree of Blistering of Paints”. This test uses these pictorial standards to quantify both the size and density of blisters that may develop in linings. Although the standard uses a blister size scale of 0 to 10 this chart uses the most common sizes of blisters found in the field. The standard does not use a reference for the size of each of the blisters depicted. CSI used this scale as a means for further quantification by qualifying the largest blister depicted as being 1 inch in width (Blister Size No. 2) and the smallest blister being 1/32 of an inch in width (Blister Size No. 8). Few Medium Medium Dense Dense Blister Size No. 2 Blister Size No. 4 Blister Size No. 6 Blister Size No. 8

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