B08_Attach 3 Report 7_Discovery Demolition Observations Report.pdf

CRATER LAKE NATIONAL PARK

Klamath County, Oregon

CORRECT STRUCTURAL DEFICIENCIES

& STABILIZE STEEL VISITOR CENTER

CRLA

PMIS NO. 198641

DISCOVERY DEMOLITION

OBSERVATIONS REPORTS

NATIONAL PARK SERVICE

DENVER SERVICE CENTER

August 10-13, 2020

RIM Architects and Speweik Preservation Consultants convened at the project site, the Steel Visitor Center, from August 10 through 13, 2020, for the purpose of observing interior and exterior discovery demolition. The NPS arranged for Dark Horse Construction to undertake the demolition and subsequent repair efforts. The work was carried out per the ‘Discovery Demolition and Report Scope’ document that was reviewed and approved by NPS Denver Service Center, Crater Lake National Park, and the Oregon State Historic Preservation Office (SHPO).

Observations are documented in the following report sections, and the information secured will be incorporated into the pending construction documents.

Dark Horse Construction has prepared a report on their undertaking, including hazardous materials assessment of uncovered materials. Their report is provided separately.

Steel Visitor Center Discovery Demolition and Repair Report Summary ‐ Items from Proposed Scope 18‐Aug‐20

Item (& Location ID on plans)

Location Description Flr/Rm No

Photograph General Demolition Description Total Area of Surface

Finishes to be Removed

Reason Requested General Repair Description

Post‐Investigation Comments

Roof

R.1 Roof/ Chimney 1

Remove metal framework atop chimney, on east side of building, for inspection by stone masonry consultant. Provide lift for consultant use.

Approximate Dimensions: 39" W x 63" D x 24" H

Stone masonry consultant needs access to stone, to inspect condition of stonework

Reinstall metal framework after inspection

Metal framework found to be assembled/welded in‐place, and not removable without cutting. Masonry assessment conducted with framework in place, see report by Speweik Preservation Consulting.

2nd Floor

2.1 Corridor

Cut hole into chase wall, above mechanical ductwork and grill visible on north wall of stair.

Bottom to be approximately 2 feet above floor/ Existing finish is plaster skim coat on gypsum board.

Opening to be 12" high x space between studs

Gain information on contents within chase wall. Acquire overall dimensions of inside of chase.

Gypsum board to be secured back in place. Patch cuts and repaint.

Proposed hole location was under electrical panel. Park electrian assisted in confirming wiring contained in conduit, & conduit location, prior to hole being cut. 12‐1/2" wide x 6‐1/2" high hole was cut. Layout of chase/shaft space in documented in Architect report, photos, & details.

2.2 Vacant Assoc

Office

Cut hole into chase wall, mid‐ height of wall. Existing finish is plaster skim coat on gypsum board.

Opening to be 12" high x space between studs

Gain access to chimney beyond chase wall to dimension. Gain more information on the connection between the chimney and second floor system.

Gypsum board to be secured back in place. Patch cuts and repaint to match existing per park.

Two holes ended up being cut. North and west faces of chimney as‐builted. Layout of chase/shaft space in documented in Architect report, photos, & details.

1st Floor

1.1 Stair 1

Cut hole into chase wall at landing between 1st and 2nd floors, between wood base and handrail. Hole may need to be behind temporary shoring post, to avoid chimney in the wall.

Existing finish is plaster skim coat on gypsum board.

12"x12" opening Gain information on contents within chase wall. Acquire overall dimensions of inside of chase. Check for routing of exhaust from basement.

Gypsum board to be secured back in place. Patch cuts and repaint.

Two holes ended up being cut, one below 2nd floor framing, and one above. Layout of chase/shaft space in documented in Architect report, photos, & details.

Discovery Demolition Report_20‐08.xls 1 ‐ 2

Exterior

E.1 Exterior

Remove portion of roofing to provide access for test core drilling of stone wall, from the top. See attached drawings for more information on roof removal, location of core drilling per Structural. Procedure requirements per Speweik Preservation Consultants ‐ letter.

About 38 SF of roofing Test core drilling technique recommendations on stone wall.

Plug top of two core drilled hole with rockwool insulation.

Reinstall blocking between joists. Reassemble roof assembly with salvaged materials, or materials matching in‐kind (thickness, type of material [cedar] and dimension). Match existing "hit and miss" pattern.

Roof partial removal, and core drilling of stone wall completed. Configuration of existing roof framing documented in Architect report, photos, & details. Refer to report from Dark Horse Construction on core drilling effort.

Notes:

1. All reasonable care is to be taken in the removal and reinstallation of historic materials, do not remove more existing finishes than is necessary. Store historic materials safely during the discovery work.

2. Consult Park Historian, if there is any question as to the historic significance of a particular finish or molding.

3. All storage, repair and reinstallation of historic materials, along with finished appearance, is to be acceptable to the Park Historian. Finished appearance to match adjacent areas.

4. Asbestos is not anticipated. Refer to attached investigation report.

5. If, during the opening up of hidden areas, noticeable amounts of suspect or potential mold are observed, contractor to cover the opening in the gypsum board wall surface with minimum 8 mil vapor retarder. Top of vapor retarder to be securely taped at the top. Bottom corners to be taped, but allow lifting up and observation of hidden areas by the design team. Do not disturb building materials in hidden areas further. If the gypsum board cut‐ out has evidence of mold, bag and dispose of, and patch the hole with new gypsum board. Contractor to notify NPS. This also applies if obviously wet and water damaged building materials are noticed. NPS will arrange for testing and removal protocol.

Discovery Demolition Report_20‐08.xls 2 ‐ 2

UP

UP

UP

STORAGE

AUDITORIUM

HISTORIC BENCH

VISITOR'S LOBBY/

SALES

620 SF

ENTRY

TERRACE

OFFICE

UTILITY

STORAGE ROOM

UP

DN

DN

WOMEN'S

RESTROOM

MEN'S

RESTROOM

SALES

140 SF

DF

DN

A

A

A

A

A

STOR

POST OFFICE

STAIR 2

STAIR 1

A

E.1

1.1

FIRST FLOOR PLAN - LEGEND

BLDG.4 0 4 128

SCALE OF FEET

NOVEMBER 20, 2019

DDS2.1

A.1

*SEE ALSO DDS1.1

DN

DN

INTERP. WORKSHOP

CORRIDOR

VACANT ASSOC OFFICE

LAV

OFFICE

PARK LIBRARY

LINE OF ROOF ABOVE

VACANT OFFICE

VACANT

OFFICE

LINE OF GROUND FLOOR BELOW

CEILING LINE

INTERP

LEAD

STAIR 2

STAIR 1

2.1 2.2

SECOND FLOOR PLAN - LEGEND

BLDG.4 0 4 128

SCALE OF FEET

NOVEMBER 20, 2019

E.1

DDS2.1

R.1

ROOF PLAN - LEGEND

BLDG.4 0 4 128

SCALE OF FEET

NOVEMBER 20, 2019

E.1

DDS2.1

Architect Field Report

Project: Correct Structural Deficiencies & Stabilize Steel Visitor Center Project No.: 181027.001 Date: August 10 - 13, 2020

Time: Varied, see below. Temperature: Varied Weather: Varied

Estimate of Completion: N/A Conformance with Schedule: N/A

Reported by: Bryce Klug, AIA

WORK IN PROGRESS:

RIM Architects was on-site to observe the Discovery Demolition investigation, described in the ‘scope’ spreadsheet dated November 20, 2019. Item numbers from that document is referenced below.

OBSERVATIONS:

Monday, August 10, 2020. Weather: sunny and clear.

Item E.1: Dark Horse Construction personnel were setting up. Bryce confirmed wall section where core drilling is to occur.

Item 1.1: Cutting a hole at stair handrail height was called for, to provide visual access to adjacent chase. A 6” x 9.5” hole was cut. Foil faced rigid insulation was observed on the exterior west wall, and the ‘lid’ of the chase. East wall is lath & plaster on brick chimney. North wall has fiberglass batt insulation. The ‘lid’ is at the underside of the 2nd floor framing, where the floor framing extends beyond knee walls that create the thermal envelope. To observe above the chase ‘lid’, a second hole (6.5” x 12”) was cut, providing visual access to the partial attic space.

August 10 – 13, 2020 Discovery Demolition investigation – Architect report www.rimarchitects.com Page 2 of 5

Item 2.1: Proposed location of hole, for visual access to chase, is underneath an electrical panel.

Coordination with the park electrician was undertaken, to confirm if wiring is in conduit, and location of conduit. 6.5” x 12.5” hole was cut. Ductwork and conduits visible. Hidden area is built as shaft, open through second floor framing. Measurements taken.

Item 2.2: A 6” x 5” hole was cut approximately centered on chase beyond. Brick of chimney encountered 2-3/4” away in hole. A second hole (7” x 11.5”) was cut at north end of chase. Round insulation-wrapped duct observed in distance. Framed wall on north has fiberglass batt insulation.

North face of chimney is mortared stone.

Item E.1: Dark Horse Construction had removed shake roofing materials, and sheathing boards, at rafter/joist space that meets criteria of maximum 1’-5” from end of wood lintel of windows. This is at south end of wall segment. They encountered a mechanical duct leading to a vent grill mounted in the blocking at the face of the stone wall.

www.rimarchitects.com Page 3 of 5

Tuesday, August 11, 2020. Weather: sunny and clear. Temperature: 50 degrees at 8:15 am.

Item E.1: Dark Horse Construction on scaffolding and removing shake roofing materials at north end of wall segment. Between 9:45 and 10:15, Bryce generated as-built sketch of top of wall condition.

Bryce pointed out the roof sheathing board, from face of stone wall, to eave edge are historic and to be preserved. Mid-morning Bryce discussed with John Speweik core drilling hole at south end of wall segment. It was determined Dark Horse should drill at the rafter/joist space immediately north of the wood lintel, it will meet minimum 9” from intel. It was noted this location will be near the crawlspace vent that was plugged as part of 1986 renovation project. Later in the morning, as Dark Horse prepares the mounting of the drill rig on the wall, they point out that two of the three sheathing boards will need to be removed, to accommodate the plate of the drill. After discussing with Kirsten Hardin, it was agreed that boards could be cut, the width of the rafter/joist space, on top of the rafter, for reinstallation. Mid-afternoon Dark Horse was not able to contain water seeping out from under the wood sill plate. Decision was to remove the wood plate and rebuild up with Cementitious compound, drilling to resume tomorrow.

Item R.1: Dark Horse Construction personnel went up to the east chimney, and removed screws holding the cage to the chimney. It was discovered that the cage appears to have been assembled in-place, it is narrower at the bottom than the top. It can not be removed without cutting the plate steel.

John Speweik inspected the stonework with the cage in place. Bryce went up in the lift to review flashings, and flue situation of the east chimney. While in the lift, he noted that the east side of the west chimney appears to have mortar coating over brickwork, that is spalling.

www.rimarchitects.com Page 4 of 5

Wednesday, August 12, 2020. Weather: mostly clear and sunny.

Item E.1: Early morning, Dark Horse Construction revised drill base condition, and resumed drilling.

Drilling progressing carefully, stopping occasionally to adjust for water coming through exterior mortar joints. Mid-afternoon, larger amount of water flowing out of joints, both interior and exterior.

Kirsten briefed, and Dark Horse will be allowed to proceed tomorrow, with additional interior and exterior water containment and removal process.

While investigating items in the crawlspace, Bryce documented that the former crawlspace vent was not plugged full depth, as called for in the 1986 renovation project documents. Dark Horse Construction reported on August 15 that the edge of the vent opening was encountered.

www.rimarchitects.com Page 5 of 5

Thursday, August 13, 2020. Weather: clear and sunny.

Item E.1: Dark Horse Construction has set up exterior water capture system on finish grade. Around 9 am it was estimated core drill was down around 21 inches, with minimal water leakage. Initial core samples set aside. At 9:45 am, Bryce left the site, returning to Anchorage.

ATTACHMENTS:

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;o" cdr,"7#., QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

Report Distribution Date: Friday, August 21, 2020 Page 1 of 42

PROJECT: Steel Visitor Center Crater Lake National Park CRLA 198641 - Discovery Demo Investigation

CLIENT: Bryce Klug, Project Architect, RIM Architects

RE: REPORT QUALITY ASSURANCE, HISTORIC MASONRY - DIVISION 4

ASSIGNMENTS: Observations on historic masonry during vertical core drilling operations on the west elevation of the building. Monitored tools, methods, and approach to completing two (2) cores through the historic stone masonry wall on the Steel Visitor Center. Participate in quality assurance inspection activities that included documenting the core drilling process and reviewed the existing conditions of the chimney on the east elevation.

DATE: Tuesday, August 11, 2020 TIME: 10:30 a.m. – 3:30 p.m. PDT WEATHER: Sunny / Partly Cloudy TEMP: High: 88F Low: 42F WIND: N/A HUM. Did not measure STONE TEMP: Did not measure

DATE: Wednesday, August 12, 2020 TIME: 7:00 a.m. – 3:00 p.m. PDT WEATHER: Sunny / Partly Cloudy TEMP: High: 75F Low: 42F WIND: N/A HUM. Did not measure STONE TEMP: Did not measure

DATE: Thursday, August 13, 2020 TIME: 7:00 a.m. – 4:00 p.m. PDT WEATHER: Sunny / Partly Cloudy TEMP: High: 76F Low: 43F WIND: N/A HUM. Did not measure STONE TEMP: Did not measure

PRESENT AT SITE DURING THE DISCOVERY DEMOLITION INVESTIGATION:

Bryce Klug, RIM Architects Kirsten Hardin, National Park Service Michael Green Jr., Dark Horse Construction, LLC Jerry Davis, Dark Horse Construction, LLC Jason Davis, Dark Horse Construction, LLC Chris Zach, Dark Horse Construction, LLC John Speweik, Speweik Preservation Consultants, Inc.

QUALITY ASSURANCE INSPECTION:

John Speweik, of Speweik Preservation Consultants (SPC), conducted a Quality Assurance Inspection August 11-13, 2020. This report contains observations on the condition of the east elevation chimney as well as observations on the discovery demolition activities, specifically the core drilling operations. The report also identifies the areas of concern and obstacles that were addressed during the core drilling operations.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

Report Distribution Date: Friday, August 21, 2020 Page 2 of 42

Fig. 1 East Elevation Chimney: The image above shows the east elevation chimney with steel cap and bracing. An attempt was made to remove the steel cap and bracing but was unsuccessful. It appears the bracing was fabricated in place, as a result the cap could not be removed by simply lifting it off as originally thought.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 2 Chimney Design Details: The image above shows two (2) separate masonry tile flue liners that contain stainless steel insert flue liners capped with the same material. The center stone masonry pier assists in bridging the two (2) masonry cap stones on the top of the chimney.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 3 Chimney Existing Condition: SPC noted a mortar joint requiring repointing inside the west side of the center masonry pier.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 4 Chimney Existing Condition: SPC reviewed the existing condition of the mortar cap that surrounds the masonry tile flue liners. The mortar cap is cracked and must be removed and replaced with a new replacement mortar cap and detailed to match the original design.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 5 Chimney Design: The image above shows the width of the chimney at the top cap area measures 33 inches.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 6 Chimney Design: This image shows the length of the chimney at the top cap area measures 60 inches.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 7 Chimney Design: SPC noted that the flue liners measure 13.5 inches square.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 8 Chimney Existing Condition: SPC noted several mortar joints that have been previously repaired with sealant on the south elevation of the chimney. The sealant must be removed and the mortar joint repointed with the specified mortar to match the original formulation.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 9 Chimney Design: The image above shows the west flue liner.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 10 Chimney Design: The image above is the east flue liner. SPC noted the interior surfaces of both of the stainless-steel flue liners were very clean.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 11 Chimney Existing Condition: The chimney on the west elevation is in good condition. The mortar joints appear to be performing well and the copper flashing is in satisfactory condition.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 12 Chimney Details: SPC noted a two (2) inch off-set in the chimney just beneath the cap area. This off-set extends to the entire perimeter of the chimney at this location.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 13 Chimney Existing Conditions: SPC noted several mortar joints that have been repaired with sealant on the east elevation. The sealant must be removed and the mortar joint repointed with the specified mortar that matches the original formulation.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 14 Chimney Existing Condition: This image shows a bed joint that requires repointing on the east elevation (yellow arrow).

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 15 Chimney Design Details: Overall the chimney is in good condition for the exception of a few repairs that have been mentioned. Note the two (2) inch off-set (yellow arrows) previously noted.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 16 Chimney Design Details and Condition: This image of the west chimney shows the roof side of the chimney constructed from back up brick rather than stone. The brick have been parged coated with cement. The brick are deteriorating at several locations and require replacement. A new parge coat should be applied to the brick after installation.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 17 Core Drilling Operations: The image above shows the cutting end of the two (2) inch diameter diamond core bit. The drilling procedures involve running water during the cutting process to cool the diamond bit. Excess water and slurry produced from the coring operation is collected at the mouth of the opening using a vacuum.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 18 Core Drilling Operation: This image shows the scaffolding used to set up for the core drilling operations. Two (2) cores were drilled several feet apart at this location.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 19 Core Drilling Operation: This image shows the drilling post being mounted plumb to allow the core to penetrate the wall plumb at the center point of the wall.

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Fig. 20 Core Drilling Operation: During the first attempt the core penetrated the wood sill plate. Once the core exited the bottom of the wood sill plate, the water began leaking under the plate. Operations were stopped and an attempt to drill a pilot hole to the core location was tried but failed. The image above shows the coring location after the wood sill plate was removed. It was decided that the space the wood sill plate occupied could be filled with a rapid set cement to create a better seal at this location.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 21 Core Drilling Operation: In an attempt to create the maximum bond strength, an acrylic fortifier was used in a slurry coat over the existing concrete prior to casting the rapid set cement.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 22 Core Drilling Operation: A rapid set non-shrink grout was used to fill in the wood sill plate void and to create an even surface for the mounting bracket.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 23 Core Drilling Operation: The image above shows the acrylic fortified slurry coat being applied over the existing concrete in the wood sill plate void area.

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Fig. 24 Core Drilling Operation: The rapid set non-shrink grout being mixed using a paddle drill to the proper consistency.

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Fig. 25 Core Drilling Operation: The image above shows the wood sill plate void filled with the rapid set non-shrink grout. The grout was cast flush with the existing concrete surface towards the interior side of the wall.

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Fig. 26 Core Drilling Operation: These images above show the dimensions of the wood sill plate that was removed. The measurement was 5-1/2” x 1-5/8”.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 27 Core Drilling Operation: This image shows the core drill mounting bracket attached to the masonry wall. Note the putty placed around the opening of the core hole to prevent water leakage at this location during operation. A vacuum is used at this location to collect excess water during operations.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 28 Core Drilling Operation: The image above shows the core drill set up with the diamond core attached to the drill attached to the post while penetrating the top of the wall.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 29 Core Drilling Operation: This image shows the interior space on the west elevation where water leaked through from the core drilling operations (yellow arrow). The drilling was stopped and the condition evaluated. Some base board trim was removed to determine the entry point of the water infiltration. After some discussion, is was decided to continue with the core drilling and to vacuum all water that entered this area of the wall from the base of the wall at floor level.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 30 Core Drilling Operation: Water leakage was also occurring through the mortar joints on the exterior during core drilling. A plan was developed to capture the runoff water from the exterior wall into a custom capture tray. In an effort to contain the water, the exterior mortar joints were cleaned and tape was applied to the area to receive plastic.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 31 Core Drilling Operation: A heat gun was used to secure the tape and plastic to the existing mortar joints.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 32 Core Drilling Operation: This image shows the custom plastic capture tray used to collect water from the core drilling operations.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 33 Core Drilling Operation: This image shows water leaking from the mortar joints during the core drilling operations.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 34 Core Drilling Operation: This image shows water leakage patterns. The water leaked through the stone and mortar interfaces. It did not leak through the stone or through the mortar.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 35 Core Drilling Operation: This image shows a close up of a core removed from the wall. At this location the core penetrated both the back of the stone wall and the cast-in-place concrete interior wall surface. A total of 29 cores were collected from the first core location measuring different lengths. Of the 29 cores only 12 cores contained fragments of stone. The majority of the cores were through solid concrete substrate.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

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Fig. 36 Core Drilling Operation: SPC noted water flow through the mortar stone interfaces during the core drilling operations. The flow volume changed as the core penetrated deeper from the top of the wall.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

Report Distribution Date: Friday, August 21, 2020 Page 38 of 42

Fig. 38 Core Drilling Operation: This image shows the core being removed from the wall after reaching a depth of 13.5 feet. The distance from grade to the wood sill plate at this location was approximately

10.5 feet. This means the core drilling penetrated 3 feet below grade before reaching what appeared to be a gravel base.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

Report Distribution Date: Friday, August 21, 2020 Page 39 of 42

Fig. 39 Core Drilling Operation: This image shows the 29 cores removed from the wall during the first drilling operation (north) on Thursday, August 13, 2020.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

Report Distribution Date: Friday, August 21, 2020 Page 40 of 42

Fig. 40 Core Drilling Operation: The second drilling operation was completed on Friday, August 14, 2020. The core drilling on the second location (south) was limited to approximately nine (9) feet due to an existing vent opening near the foundation that was not filled in with masonry. This image shows the interior crawl space and the vent opening at the core drilling location. SPC was not on site.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

Report Distribution Date: Friday, August 21, 2020 Page 41 of 42

Fig. 41 Core Drilling Operation: This image shows the close up of the top of the stone masonry wall after the two (2) inch core drilling operations were complete. The core was centered on the top of the wall. The wall measured approximately thirteen (13) inches in width. The core bit was centered at approximately six and one half (6.5) inches.

Summary:

SPC believes 2-inch core drilling through the historic stone masonry walls is a viable option for installing steel reinforcement. Some core drilling water (slurry) leakage is expected on both sides of the walls. The leakage on the interior is believed to have penetrated from the concrete fasteners. The leakage on the exterior is through the mortar joint interfaces with the stone; however, not all interfaces were leaking.

SPC noted only 3 visible holes in the mortar where water was exiting during core drilling operations.

During the core drilling operations the exterior mortar joints that exhibit large amounts of water leakage should be marked and repointed to minimize any grout leakage from that area during steel reinforcement operations. This investigation proved that core drilling water (slurry) could be captured efficiently on both sides of the wall and disposed of off site. Capturing the core water (slurry) from the top of the wall proved inefficient due to the amount of voids in the wall system.

All cores were sequentially numbered as they were removed from the wall. The cores were saved and are on site for anyone that would like to review them.

QUALITY ASSURANCE Steel Visitor Center, Crater Lake National Park DIVISION 04 - MASONRY Quality Assurance Inspection Report: August 21, 2020

Report Distribution Date: Friday, August 21, 2020 Page 42 of 42

Thank you for the opportunity to provide you with this quality assurance field report for the Steel Visitor Center, Discovery Demolition Investigation. Please feel free to contact me regarding any technical questions you might have regarding the information contained in this report.

SUBMITTED BY:

SPEWEIK PRESERVATION CONSULTANTS, INC.

John Speweik, CSI, ASTM

Speweik Preservation Consultants, Inc.

3163 Heritage Pkwy Elgin, IL 60124 Phone: 224-856-7449