Attachment A-Dallas CMOP -Design Analysis Report-7-10-23_Revision of 8-17-23.pdf

DALLAS CMOP WAREHOUSE RACKING

2962 S. Longhorn Drive Lancaster, Texas 75134

FSC Project F23044

Existing Fire Sprinkler System Assessment of Existing Condition

Phase One – Draft Report

June 30, 2023 Revised July 10, 2023 (per TEAM meeting of 6-29-23)

Revised August 17, 2023 (per RFIs 7-26-23)

Prepared for

Mr. Bob Sinclair, Chief of Staff

Atriax, PLLC 102 3rd Avenue, NE Hickory, NC 28603

Prepared by

Hasu Doshi, PE

FSC, Inc.

8675 West 96th Street

Overland Park, KS 66212 Phone 913.722.3473

DALLAS CMOP WAREHOUSE RACING SITE PREP–PHASE Lancaster, TX 75134

FIRE SPRINKER SYTEM ASSESSMENT OF EXISTING CONDITION

7/10/2023

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Table of Contents

1 INTRODUCTION _________________________________________________________________ 2

2 REVIEW OF THE INFORMATION PROVIDED TO FSC __________________________________ 2

3 SITE VISIT ____________________________________________________________________ 13

4 APPLICABLE CODES AND STANDARDS ___________________________________________ 14

5 AUTHORITIES HAVING JURISDICTION (AHJ) _______________________________________ 15

6 USE OF SPECIAL STORAGE SPRINKLERS _________________________________________ 15

7 HYDRAULIC ANALYSIS – BUILDING #1: ___________________________________________ 18

8 RECOMMENDATIONS (CMSA SPRINKLERS) _______________________________________ 20

9 ROUGH ORDER OF COST ESTIMATE (CMSA SPRINKLERS) __________________________ 20

10 INFORMATION NEEDED FROM VA ________________________________________________ 20

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1 INTRODUCTION

As part of Atriax Group Design Team, FSC, Inc. has been retained to assess the existing fire sprinkler system located in the warehouse portion of Building #1 and develop design options and propose necessary improvements, if needed, to the existing system. The facility is planned to beutilized for the storage of pharmaceuticals and packing supplies in a racking arrangement.

Scope of work is limited to the fire sprinkler system located in the original Building #1 portion only (referenced as “Warehouse” on St. Onge Company’s drawings). Fire sprinkler systems in the 2002 addition known as Building #2 (referenced as “ORDER FILL” on St. Onge Company’s drawings) are to remain as-is.

FSC is to provide following services, under two phases, as provided in VA document of the PROJECT DESIGN SCOPE OF WORK, revised May 10, 2023

Phase One: FSC will perform following:

a. Review of existing documents and prepare for site visit.

b. Conduct site visit for investigation and documentation of existing conditions.

c. Prepare draft report of findings. This will include:

• Capability of existing fire sprinkler system to verify if the system is capable of providing required NFPA 13 density for protection of storage in proposed racking system.

• If the existing system is inadequate, provide a summary of options (including required changes) and rough order of magnitude cost estimate. The options are to be summarized in a paragraph and/or on a simple concept drawing.

d. Revised report per 29th June 2023 TEAM meeting between Bob Sinclair and Hasu Doshi of the design team and J. Andrew Comingore of VA. The following directive was provided by VA addressing questions listed in Section 10 of this report.

• Commodity classification: As listed in this report is correct. The pallets delivered are shrink-wrapped on all sides.

• Open racks - Racks are open (no solid shelving).

• Variances - VA does not want to consider any variances discussed in this report.

• In-rack sprinkler system - VA prefers not to have in-rack sprinklers. Per FSC’s recommendation, design team to explore other options to support not having in-rack sprinklers as discussed in this report.

• Assumptions- All other assumptions discussed in the report are correct.

Phase Two: If the VA decides to proceed with the proposed changes, they will issue a change order to the design team for the final report and preparation of revised drawings.

2 REVIEW OF THE INFORMATION PROVIDED TO FSC

FSC was provided with following documents related to Building #1:

a. Drawings prepared by Texas Sprinkler, Inc. - Site Plan drawing C1, dated 8-9-02 and fire sprinkler drawings FP1 and FP2, dated 6-17-02.

b. Information prepared by St. Onge Company

• Drawings, dated 9-9-22, showing floor plan of the proposed Racking System in

Building #1.

Current Conditions - Drawing VADWH_21_03_01_000_PN-RB.DWG Change for proposed Racking - Drawing VADWH_21_03_01_01D_PN-RB.DWG

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• Functional Specification Document for Rack Storage Systems, dated 9-26-22

c. For Building #2, reports by Action Automatic Sprinkler, Inc

• Fire sprinkler inspection report dated 3-3-22.

• Fire pump inspection and flow test report dated 4-6-22.

d. Drawing showing city water supply mains between East & West Longhorn Drives.

e. Dallas warehouse photos dated 4-28-23.

f. Photo of existing fire sprinkler riser in Building #1

g. List of commodities - operational supplies-pallet space.

Review of Documents and Observations:

The facility consists of two buildings built under two phases. The original Building #1 (West side) covers 24,900 SF and the 2002 addition of Building #2 (East side) covers 60,000 SF.

Both buildings are currently protected with previously approved and functioning wet-pipe sprinkler systems. Each building has an individual fire service entrance taking supply from an existing 8” city water supply main located in South Longhorn Drive.

Building #2 (not part of Scope):

Protected with an ESFR sprinkler system and contains a fire pump. Fire pump is located in the South-West corner of the building and is served by an 8” express overhead main charged from the city supply. Pump room also houses two sprinkler systems for Building #2. Each system size is 30,000 SF. Remote fire department connection is located on the North side, close to South Longhorn Drive and served from the discharge side of the fire pump. 8” Ames double-check backflow is provided outside in underground vault. Each system piping layout consists of 6” riser, 6” bulk main and a gridded system design of 6” primary main x 4” secondary main x 2” branch lines. The sprinkler spacing is limited to 100 SF coverage. The building appears to be of open steel trusses and joists construction with a clear height of 24’.

Flow test information as listed on Texas Sprinkler’s 2002 drawing is 71 PSI (static), 60 PSI (residual) with 1,100 GPM flowing. April 6, 2022 fire pump test report shows city water supply available at the pump suction side of 60 PSI (static), 44 PSI (residual) with 1,250 GPM flowing and the discharge side of 164 PSI churn (static), 132 PSI (residual) at 1,250 GPM, and 90 PSI at 1,875 GPM. This is net after deducting losses through the existing piping system of 8” underground main, 8” backflow, and 8” express main (from North entry to pump house). Being a recent test, FSC’s preliminary analysis is based on this water supply data. Electric fire pump is rated for 1,250 GPM at 90 PSI.

Building #1 (part of this Scope):

Not much information is available regarding the existing fire sprinkler system. This is to be further investigated during site visit. Photo of existing riser indicates wet pipe system served by 6” riser with 6” Reliable alarm valve. Texas Sprinkler company’s site plan indicates this riser is served by the underground fire service (size not shown) from 8” city main on South Longhorn Drive. Inspection report (similar to Building #2) of existing sprinkler system was not provided. Also, the existence of required backflow device and fire department connection (FDC) is not confirmed.

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Existing Riser in Building #1

VA proposes to order a racking system to store pallet loads of cartoned, stretch-wrapped materials. From furnished list of commodities, it appears most stringent NFPA 13 commodity classification will be Class IV. Completely enclosing pallet load with stretch-wrapping is defined as encapsulation. See following snapshot of NFPA 13 definition of cartoned and encapsulation.

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The purpose of this study is to investigate if the existing fire sprinkler system is capable of delivering NFPA 13 design density for protection of stretch-wrapped cartoned commodity on pallets in rack arrangement. It is assumed these racks are to be open as defined by NFPA 13 with no solid shelves. If the existing system is not capable of delivering required density, FSC will list options as to required changes.

St. Onge Company’s report (Doc #VADWH-001-02, dated October 26, 2022) provides following information regarding racking system.

1. Floor Plan

2. Drive-in Rack (Section 5.1):

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As per above, this racking system will be used exclusively for prescription vial storage stock in bottles. Two stretch wrapped pallets are received and consolidated into one unit for storage. The sketch shows 2 levels of storage with the top load being at 16’-4”. The racks are 8 deep (width of 25’) The horizontal member consists of C-channel structural steel. The aisles are wider than 8’-0” with rack depth of 25’- 0”.

Per Table 25.3.2.2.1 (A)(d), the ceiling fire sprinkler design density is 0.41 over 2,000 SF using high-temperature sprinklers, for the maximum storage height up to 18’-0” with maximum ceiling height of 38’-0” with one level of in-rack sprinklers.

VA was able to confirm that these racks are considered “Open” per email dated 7/26/23 from Joseph A Comingore. NFPA 13 defines open racks as shelves with more than 50 percent opening; see snapshot below. If not open, fire sprinklers are to be provided at the top of each load level.

Google defines a vial as a small glass or plastic vessel or bottle, used to store medication in the form of liquids, powder, or capsules. Per NFPA 13, the commodity classification is Class IV (see snapshot below) and drive-in racks are considered as multiple-row racks (see snapshot below)

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Per NFPA 13, Table 21.4.1.5.1, being encapsulated, minimum of one level of in-rack sprinkler protection is required. Per Table 25.3.2.2.1 (A)(a), the ceiling sprinkler design density is 0.24 GPM/SF over 2,000 SF for storage height of 18’-0” with maximum ceiling height of 38’-0” using high-temperature fire sprinklers.

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Figure A.3.3.177(g) Flow-Through Pallet Rack.

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3. Pushback Rack (Section 5.2):

This racking system will be used exclusively for vial caps and shipping bags. The sketch shows 3 levels of storage with the top load at 18’-5”. The racks are 2 deep (total depth of 8’- 6”) with 6” flue-space between 2 loads. The horizontal member is 4” C-channel beams.

The VA was able to confirm, per email dated 7/26/23 from Joseph A Comingore, that these racks are considered “Open” as defined by NFPA 13 (as shown in snapshot above). If not open, sprinklers are to be provided at the top of each level of load.

NFPA 13 defines multiple-row racks as more than two pallets deep or racks greater than 12’- 0” in depth. Therefore, pushback racks are not considered single or double row racks nor as multiple-row racks. Per Table 25.3.2.2.1 (A)(d), the ceiling design density is 0.39 GPM/SF over 2,000 SF for the maximum storage height of up to 25’-0” with a maximum ceiling height of 45’-0” with one level of in-rack sprinklers.

3 SITE VISIT

The design team conducted a site visit of Building #1 (warehouse) on Monday, 5th June 2023 and with the assistance from the VA, was able to document existing overhead fire sprinkler piping layout. The Team also reviewed existing conditions in the pump room of Building #2. See attached meeting memorandum with list of attendees and project kickoff – meeting agenda.

Summary of findings:

Building #1 (Warehouse)

• Construction is open steel trusses.

• 6” wet-pipe sprinkler system riser located along North wall.

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• Piping layout consists of a gridded system with 4” primary main x 4” secondary main x 2” branch lines.

• Sprinkler spacing varies from 104 SF to 130 SF with spacing between varies from 10’- 0” to 13’-0”. For storage occupancy, NFPA 13 limits spacing to 100 SF and spacing between sprinklers to 12’-0” (12’-6” in 25’-0” bays) for design densities greater than

0.25 GPM/SF.

• Fire sprinklers are of the K-5.6 upright type and of high temperature rating with ½” thread.

• Building height is about 22’-0” at highest point and has a roof slope of less than 2 in 12.

• Except for planned storage of the racking system, the highest occupancy classification (as defined by NFPA 13) is ordinary hazard group 2 which allows miscellaneous storage to 12’-0” in height.

• NFPA 13, Section 20.13.1 (1), allows the required sprinkler protection of higher hazards to extend 15’-0” beyond the perimeter of the higher hazard. This allows reinforcement of the existing system in the rack-storage with 15’-0” of buffer areas.

• The sprinkler system is not connected to the fire pump in Building #2.

• There are no hydraulic placards on system risers.

4 APPLICABLE CODES AND STANDARDS

Most stringent requirements of following:

Codes and standards as adopted by the City of Lancaster, Texas VA Fire Protection Design Manual 8th Edition, June 1, 2021

• Section 1.1.D Applicable for new facility – use as guide of existing facility.

• Section 1.3 B National Fire Code by NFPA – latest edition, NFPA 101 and IBC (only not addressed by National Fire Code)

• Section 6.1 C NFPA 13

• Section 6.1 H Bulk supply storage to be classified per NFPA 13

This analysis is based on the latest edition of NFPA 13-2022.

Summary of NFPA 13 minimum requirements (per the applicable codes listed above) for the storage arrangement described:

a. Design Density for roof system (as listed above) will be 0.25 GPM/SF over 2,000 SF using

CMDA (Control Mode Density Area) sprinklers.

b. Minimum one level of in-rack sprinkler protection is required.

c. Hydraulic calculation is to be based on simultaneous operation of fire sprinklers at the roof plus in-rack sprinklers plus 500 GPM for outside hose (per Table 20.15.2.6)

d. NFPA 13 Section 21.1.3 requires standard response fire sprinklers with K-8.0 or higher.

Existing installation consist of K-5.6 fire sprinklers which need to be replaced with K-11.2 upright 286-degree fire sprinklers with ½” thread available in the market place.

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e. NFPA 13 Table 10.2.4.2.1 (d) provides roof fire sprinkler spacing limitation based on density. For less than 0.25 GPM/SF density, it permits spacing between fire sprinklers up to 15’-0” and 130 SF coverage. For densities of 0.25 GPM/SF or higher, limitation changes spacing between fire sprinklers up to 12’-0” and 100 SF coverage. The existing installation has more than 12’-0” spacing between fire sprinklers and more than 100 SF coverage.

Since our design density is higher than 0.25 GPM/SF, a variance will be required from the Authorities Having Jurisdiction. Otherwise, it will require respacing of the existing branch lines with new branch lines, in order to maintain 100 SF coverage.

5 AUTHORITIES HAVING JURISDICTION (AHJ)

City of Lancaster

VA – National Engineering: J. Andrew Comingore, Engineer, National CMOP, (469) 475-7218

6 USE OF SPECIAL STORAGE SPRINKLERS

Options noted above are based on using traditional Control Mode Design Area (CMDA) sprinklers requiring addition of in-rack sprinkler system for Class IV commodity per NFPA 13-2022.

During Team meeting on 29th June 2023, FSC asked if the VA has any concerns having fire sprinklers in racks which could be impacted by the accidental discharge from in-rack fire sprinklers due to damage by fork-lift operations. VA asked the design team to explore other design options without having in-rack fire sprinklers. FSC mentioned the use of special sprinklers, including Early Suppression Fast Response (ESFR) which may not require in-rack sprinklers.

Early Suppression Fast Response (ESFR) sprinklers:

Existing sprinklers are K-5.6 upright with ½” thread. ESFR fire sprinklers have ¾” and 1” threads. Retrofitting existing system with ESFR will require demo of all existing piping and replacing with new branch lines having ¾” or 1” outlets.

Control Mode Specific Application (CMSA) sprinklers:

FSC explored another option using CMSA fire sprinklers.

1. Use of CMSA retrofit sprinklers with ½” thread is available in the marketplace. See attached datasheet of Viking CMSA K-11.2 sprinkler. This allows use of existing ½” outlets on existing 2” branch lines if proven by hydraulic calculations.

2. No in-rack fire sprinklers are required which eliminates concern of accidental discharge due to damage by fork-lift operations.

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NFPA 13-2022 provides following criteria for CMSA sprinklers:

1. Design criteria and commodity classification:

Per Table 22.4 and Table 22.5, K-11.2 high-temperature upright fire sprinklers designed to deliver a density of 50 PSI with 15 sprinklers operating will protect following occupancies:

• Class IV encapsulated or nonencapsulated commodity stored on single, double and multiple-row open racks to a maximum storage height of 20’-0” in a building with a maximum ceiling/roof height of 25’-0”.

• Group A cartoned nonexpanded plastic stored on open single, double and multiple-row racks with a minimum 8’-0” aisle, to a maximum storage height of 20’-0” feet with a maximum ceiling/roof height of 25’-0”.

Above provides most flexibility to the VA in storage of Group A cartoned nonexpanded plastics.

Single, double, and multiple-row racks

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NA: Not applicable.

*Limited to single- and double-row racks with minimum 8 ft (2.4 m) aisles.

2. Clearance between the top of storage and fire sprinkler deflector is required to be 36”.

Considering the estimated ceiling (roof height) of 22’-0” and fire sprinkler deflector distance of 12”, the fire sprinkler deflector would be around 21’-0” above the floor. This will allow the required storage height to be approximately 18’-0”.

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3. Spacing limitation:

Per Table 13.2.2.1, CMSA fire sprinklers are allowed to be up to 130 SF coverage for all occupancies except rack storage. Rack storage is limited to 100 SF. In both cases, maximum spacing between fire sprinklers is limited to 12’-0” with unobstructed noncombustible construction. However, respacing of existing branch lines will be required as current spacing between fire sprinklers exceeds 13’-0” and coverage exceeds 100 SF.

4. Obstructions to CMSA sprinklers: CMSA and ESFR fire sprinklers are very sensitive to obstructions. This may require repositioning of existing branch lines ensuring minimum required distance of building elements and other existing systems (e.g. duct work, piping, etc.).

5. Design area: To consist of 15 fire sprinklers spaced to maximum coverage of 100 SF.

Per Sections 22.1.3, 28.2.4.3.1, and NFPA 13-2022 handbook commentary for Section 22.1.4, design area is determined as follows:

Number of sprinklers operating on a line:

1.2 x square root of (15 fire sprinklers x 100 SF coverage = 1,500 SF) divided by sprinkler spacing of 8’-8” on branch line = 5.36 rounded up to 6 fire sprinklers on a line.

Total of 15 sprinklers; six fire sprinklers on two remote branch lines plus remaining 3 fire sprinklers on third branch line.

6. Minimum flow from each sprinkler: K-11.2 x square root of 50 PSI = 79.2 GPM.

7. Allowance for outside hose (Table 20.15.2.6) 500 GPM (for 15 CMSA fire sprinklers).

8. Total estimated water supply demand:

Sprinkler system: 15 fire sprinklers x 79.2 x 1.12 overage = 1,330 GPM.

Outside hose added at hydrant: 500 GPM.

Total demand: 1,830 GPM.

9. Since existing pump is rated for 1,250 GPM, it is capable of supporting system demand of 1,330 GPM.

10. Maintenance of 20 PSI minimum at City water main: Per flow test and pump test data listed on page 3, City supply is capable of providing 1,830 GPM while providing minimum of 20 PSI at the City main and provides positive pressure at pump suction inlet.

7 HYDRAULIC ANALYSIS – BUILDING #1:

Qualifications:

1. Flow test: Since there is no recent flow test data available for the City water supply, actual data provided in recent pump test at the suction side of pump is used as available City water supply. The losses through existing fire service main, backflow device, and the bulk-main is already accounted for in this test.

2. Safety factor: 100% of available pressure is used in performing following analysis; NFPA 13 does not have such requirements. However good engineering practice is to allow 10% safety factor for the fluctuation in City water supply.

3. Options of providing in-rack sprinklers, code requires simultaneous operation of the roof fire sprinkler system and in racks. For exploring capability of the existing system, this preliminary hydraulic analysis is based on the demand of roof sprinkler system only.

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Once final determinations are made, a separate site visit will be required to confirm changes discussed in this report which include:

1. Documentation of existing conditions which is to include all building structural elements, duct work, piping, etc.

2. Repositioning of existing branch lines and adding new branch lines in order to limit maximum spacing between fire sprinklers of 12’-0” and fire sprinkler coverage of 100 SF and maintaining allowable distances of CMSA fire sprinklers from obstructions.

3. Adding new supply from the existing pump room and demo of existing riser in Building 1.

4. New hydraulic calculations.

Hydraulic analysis using CMDA fire sprinklers:

Listed below are results of preliminary hydraulic calculations for the various options discussed earlier in the report.

a. Existing system: FSC created a CAD sketch of existing installation per information complied during site visit. FSC also created a hydraulic model to perform what-if analysis scenarios (see Exhibits 1 and 2).

Preliminary results of these hydraulic calculations:

1) System as-is. Existing CMDA fire sprinklers are K-5.6 with ½” threaded outlets.

System can deliver a density of 0.23 GPM/SF over 2,000 SF plus 500 GPM for outside hose allowance.

Demand is 528.30 GPM @ 50.6 PSI plus 500 GPM for hose.

These results are significantly short of the minimum density requirement of 0.41

GPM/SF and does not comply with NFPA 13 requirements of K-8.0 or higher fire sprinklers. It also does not comply with the 100 SF limitation coverage per fire sprinkler.

b. Existing system plus improvement:

1) Using existing riser and using existing city supply only.

Replace existing K-5.6 upright fire sprinklers with CMDA K-11.2 high-temperature upright fire sprinklers which have a ½” thread.

System can deliver a density of 0.29 GPM/SF over 2,000 SF plus 500 GPM for outside hose allowance.

Demand is 686 GPM @ 49.1 PSI plus 500 GPM for hose.

This is short of the minimum density requirement of 0.41 GPM/SF (this complies with NFPA 13 requirement of K8.0 or higher sprinklers). It also does not comply with 100 SF spacing limitation for fire sprinkler coverage.

2) Set up a new zone in Building #2 served by the existing pump in Building #2 and running new 6” bulk main to Building #1.

Replace existing K-5.6 upright fire sprinklers with CMDA K-11.2 high-temperature upright fire sprinklers which have a ½” thread to allow installation into the existing outlets.

System can deliver a density of 0.54 GPM/SF over 2,000 SF plus 500 GPM for outside hose allowance.

System demand is 1,265.42 GPM @ 95 PSI at pump discharge plus 500 GPM for hose.

This exceeds the minimum density requirement of 0.41 GPM/SF and does comply with NFPA 13 requirement of K-8.0 or larger fire sprinklers. This will also provide a safety factor which is about 10%. Since allowance for in-rack sprinklers is not added, new supply piping (from the exist pump) may have to be upsized from 6” to 8”.

Only variance required is for the fire sprinkler coverage - exceeding 12’-0” between fire sprinklers and 100 SF coverage. This may be acceptable to the Authority Having

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Jurisdiction (AHJ) as delivered density is much higher than required and is and existing condition.

Hydraulic analysis using CMSA fire sprinklers (see Exhibit #3):

Evaluated improvement set up a new zone in Building #1 served by existing pump in Building #2. Replace existing K-5.6 upright fire sprinklers with CMSA K-11.2 high-temperature upright fire sprinklers with ½” thread to allow installation into existing outlets. This will require setting up a new zone in the existing pump house, running new 8” bulk-main (supply main) from existing pump house in Building #2 to Building #1, and adding new bulk-main from the existing riser in Building #1 to the existing 4” cross-main on the West in Building #1.

System can deliver required density of 15 CMSA sprinklers operating at 50 PSI plus 500 GPM for the outside hose allowance.

Demand is 1251.5 GPM @ 117.1 PSI at the pump discharge plus 500 GPM for hose.

This complies with NFPA 13 requirements for intended storage and without in-rack sprinklers.

This will require repositioning of existing branch lines and adding new branch lines to bring the existing system in compliance with the allowable sprinkler spacing requirements pf NFPA 13.

With these changes, a variance will not be required.

8 RECOMMENDATIONS (CMSA SPRINKLERS)

FSC recommends making following improvements to existing system in Warehouse #1 (per Exhibit #3)

a. Replace existing K-5.6 upright fire sprinklers with new CMSA K-11.2 high-temperature upright sprinklers throughout the entire warehouse area, equal to Viking VK540 (see attached datasheet). Existing fire sprinklers in the areas separated from the rack storage, such as offices, restrooms, and breakrooms can remain as-is.

b. Abandon the existing riser in Building #1.

c. Add a new 8” system riser/zone to the existing pump house and install an 8” express main to Building #1. Also, in order to provide adequate flow to meet the new design criteria of the system and reduce friction loss thought the sprinkler piping, adding a new 4” bulk-main from the top of the existing riser in Building #1 to the existing 4” cross-main on West is required.

d. Connect new 8” express main to existing system cross main per Exhibit #3.

e. This will eliminate two existing fire department connections. The entire facility will be served by a single existing connection located outside of Building #2. Also, the maintenance of the existing riser in Building #1 will be eliminated.

9 ROUGH ORDER OF COST ESTIMATE (CMSA SPRINKLERS)

As per FSC’s rough estimate, the cost of the above recommendation will be around $99,000.

10 INFORMATION NEEDED FROM VA

Confirmation of Commodity classification listed in this report – confirmed 6-29-23.

a. Confirmation of open racks (not solid shelving) as assumed in this report – confirmed

6-29-23.

b. Variance for existing spacing exceeding 100 SF. – Directed - No Variance 6-29-23.

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c. Adding sprinklers to the proposed racking system. Sometime, operation people don’t like in-rack sprinklers– Directed – remove requirement of in-rack sprinklers 6-29-23.

d. Confirmation of the assumptions listed above in this report– confirmed 6-29-23.

Attachments:

Exhibit #1 – CMDA sprinklers - Sketch of Existing System served from existing riser.

Exhibit #2 – CMDA sprinklers - Sketch of Existing system with the proposed changes with supply from existing pump house.

Exhibit #3 – CMSA sprinklers - Sketch of Existing system with the proposed changes with supply from existing pump house.

Exhibit #4 - Hydraulic Calculations

• Existing system as-is K5.6 CMDA Sprinklers and existing city water supply.

• Existing system with improvement K11.2 CMDA Sprinklers and connection to existing fire pump

• Existing system with improvement K11.2 CMSA Sprinklers and connection to existing fire pump Datasheet -Viking CMSA VK540 K11.2 upright sprinklers