Attachment 7 - Combined 100 Percent Design Narrative.pdf

100% DESIGN SUBMITTAL

REPAIR VARIOUS DRY WELL LIFT STATIONS

WEAPONS STATION

JOINT BASE CHARLESTON, SC

Contract No. FA4418-22-D-0007 Task Order /Delivery Order No. FA441822-F0099

Project No. DKGV 1083977

Prepared for:

by:

MAY 2023

6302 Fairview Road, Suite 600 Charlotte, NC 28210

Phone (704) 358-8240 SC Eng License No. 5997

SC Arch License No. 101369

THIS PAGE INTENTIONALLY LEFT BLANK

100% Design Submittal Repair Various Dry Well Lift Stations Weapons Station

Joint Base Charleston, SC

ZAPATA Contract No.: FA418-22-D-0007 May 2023 DO No.: FA441822-F0099

Project No.: DKGV 1083977

Design Narrative

Joint Base Charleston, SC

ZAPATA Contract No.: FA418-22-D-0007 May 2023 DO No.: FA441822-F0099

Project No.: DKGV 1083977

100% Design Narrative

DSN Repair Various Dry Well Lift Stations

Joint Base Charleston, SC

ZAPATA Page i Contract No.: FA441822D0007

May 2023 DO No.: FA441822F0099

TABLE OF CONTENTS

1.0 NARRATIVE INTRODUCTION

2.0 TYPICAL LIFT STATION CONFIGURATIONS

3.0 NARRATIVE DESCRIPTION

3.1 SITE INVESTIGATION (PHASE I)

3.2 PRELIMINARY LAYOUT (PHASE I)

3.3 DESIGN DEVELOPMENT (PHASE II)

4.0 NARRATIVE - LIFT STATION 709

4.1 EXISTING CONDITIONS

4.2 DEMOLITION

4.3 SITE IMPROVEMENTS AND ALTERNATIVES

5.0 NARRATIVE - LIFT STATION 730

5.1 EXISTING CONDITIONS

5.2 DEMOLITION

5.3 SITE IMPROVEMENTS

6.0 NARRATIVE - LIFT STATION 1389

6.1 EXISTING CONDITIONS

6.2 DEMOLITION

6.3 SITE IMPROVEMENTS

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

1.0 NARRATIVE INTRODUCTION

Five of the wastewater lift stations owned and operated by Joint Base Charleston (JBC) have begun to experience decline and require frequent maintenance. Construction of the lift stations date back to as early as 1979 with renovations dating back to 1991. General industry standards, based on information contained in TR-16, Guides for the Design of Wastewater Treatment Works, revised in 2016, recommends that mechanical operating design life should be 20 years. Life cycle expectancy for structural components of pump stations range based on material of construction. Concrete structures are anticipated to need repair or replacement after 50 years of service, whereas steel structures are likely to need replacement after a 25-year period.

Joint Base Charleston (JBC) has hired ZAPATA to evaluate the lift stations and provide recommendations to correct capacity deficiencies and make recommendations to improve and increase reliability. The lift stations that are included in this report are shown in Figure 1-1.

This project will consist of the design of the replacement of three (3) dry well lift stations with wet well lift stations. The components will include perimeter fencing, pre-cast concrete wells each with three submersible pumps, flowmeters, control panels and backup generators. The design of the new lift stations shall comply with industry standards (UFC, NFPA, et.) and with State, County, City regulations. Permits are required as specified by South Carolina Department of Health and Environmental Control (SCDHEC) as part of this design development. The permits required are shown below:

• Berkeley-Charleston-Dorchester Council of Governments (BCDCOG) 208 Conformance Certification

• Coastal Zone Consistency Form for State and Federal Permitting – Letter Completed

• SCDHEC Notification Form - D-0451 (Less than 1-Acre, Not Within 0.5 Miles of a Coastal

Receiving Water) - Coastal Counties Only

• Construction Permit Application Water/Wastewater Facilities – D-1970

• SCDHEC Notification of Demolition Form - D-3428

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

FIGURE 1-1. JBC WEAPONS STATION LIFT STATION LOCATIONS.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

2.0 TYPICAL LIFT STATION CONFIGURATIONS

Lift stations use mechanical equipment (pumps) and pressurized piping (force main) to lift fluid from a low elevation point to a higher elevation and transport flows to the gravity portions of the collection system. Lift stations can be categorized by their configuration as centrifugal pump lift stations (dry well) or submersible pump lift stations (wet well).

A station containing centrifugal pumps is generally more complex than a submersible station.

Typically, the station is underground and contains the pumps, controls and electrical power distribution equipment. Adjacent to the station is a wet well with a level control system utilizing floats, compressors/bubbler tubes, pressure transducers or ultrasonic sensors to start and stop the pumps. The wet well can be either a separate structure or contained within the pump station. This type of station is preferred over a submersible station for higher flows, higher solids content, and higher elevation lifts. See Figure 2-1 for general arrangement of this type of station.

Generally, a submersible pump lift station is comprised of two or more submersible pumps placed directly inside a wet well. Valving (check valves and gate valves) for the discharge piping can either be located inside the wet well or in an adjacent valve vault. A valve vault is preferable from a maintenance and safety standpoint, as it limits the need to enter the wet well space. A level control system utilizing floats, compressors/bubbler tubes, pressure transducers or ultrasonic sensors starts and stops the pumps based on the water level in the well. The electrical power distribution panel and control panel is generally contained in an outdoor weather-proof enclosure, above ground and adjacent to the station. See Figure 2-2 for general arrangement of this type of station.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

FIGURE 2-1. DRY WELL LIFT STATION (COURTESY, MUNICIPAL SEWER AND WATER MAGAZINE, 2016)

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

FIGURE 2-2 WET WELL LIFT STATIONS (COURTESY, MUNICIPAL SEWER AND WATER MAGAZINE, 2016)

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

3.0 NARRATIVE DESCRIPTION

3.1 SITE INVESTIGATION (PHASE I)

A site visit was performed by the design team on July 7, 2022, where conditions on site could be verified. The design team met with JBC representatives to review known issues and concerns with each of the locations. Meeting minutes are provided in Appendix B. A Hazardous Material Assessment, Appendix A, has been completed to identify and sample suspect asbestos-containing material (ACM) and Lead-Based Paint (LBP) throughout the internal and external features of the five (5) lift stations that will be repurposed on the Project Site or that will be disposed of. Only lead has been detected. If the government decides to move ahead with demolition of the existing buildings, special attention will be given to Lead Base Paint materials.

LBP containing materials shall be disposed of following procedures outlined in SCDHEC’s Led-

Based Paint Waste & Residue Disposal Advisory. Studies for drawdown testing, to determine flow characteristics and diagnose potential problems of each lift station can be found in Appendix C.

3.2 PRELIMINARY LAYOUT (PHASE I)

Preliminary Site Layouts were developed and included in Appendix C of the Concept Design Submittal. The concept plans included features such as perimeter fence with gates, wet well lift stations with pumps, grinders, flow meter vaults, valve boxes, bypass pumping connections and connection points to the existing inflow line and force main. Also, the electrical equipment pads, generators, and control panels with canopy structures. The Concept Submittal report described each pump station and presents existing conditions information, demolition requirements, a description of the proposed improvements and alternatives, followed by a simplified cost estimate and cost savings through alternatives.

3.3 DESIGN DEVELOPMENT (PHASE II)

Following review of the conceptual plan, full design of three wet well lift stations: 709, 730 and 1389 have been completed to the 100%(Final) design. Lift Stations 310 and 66 will not be part of Phase II. The design of the wet well and pumps is based on the results of the studies for peak flows, waste load, and hydraulic capacities of key components such as the wet well, pumps, suction, and delivery pipework.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

4.0 NARRATIVE - LIFT STATION 709

4.1 EXISTING CONDITIONS

Lift Station 709 is Located on Jefferson Ave., across the road from the Balfour-Beatty Delivery & Self-Help Center and about 450 ft north of Boone Ave intersection. Records from the lift station are not available to establish its exact age, but per JBC it was last renovated circa 1991. LS 709 is a dry well type lift station. The station consists of a reinforced concrete pump chamber with 2 flooded suction pumps (7.3 HP and 460 V). On top of the pump chamber there is an electrical building with a roof structure housing control panels and electrical equipment. Outside the building there is a rectangular open top wet well divided in chambers which includes a grinder mounted at the inlet. A flow meter vault is also part of the lift station layout. The depth of the pump chamber and wet well are approximately 20 ft.

There is an existing building pole mounted electrical service transformers and outdoor diesel generator with subbase tank. An existing telecommunications equipment enclosure used for lift station monitoring and controls is mounted on the building exterior.

FIGURE 4-1. LIFT STATION 709.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

There are reports of infiltration after heavy rain events. A review of FEMA flood map 45015C0705E, shows that the lift station is located inside Flood Zone AE with a base flood elevation of 12 ft. The flood zone information has been taken into consideration during design development.

FIGURE 4-2. LS 709 FLOOD MAP

4.2 DEMOLITION

The demolition will include removal of the wet well, brick building and pump room, and small sections of force main and gravity sewer line. The lift station site has drywell pump control panels, diesel generator, generator automatic transfer switch, electrical panelboards, dry-type transformer, pump variable frequency drives, dry-well pumps and lighting fixtures that are operational and will be removed. Associated equipment conduit and conductors will be removed.

4.3 SITE IMPROVEMENTS

New Lift Station – The new lift station shall include a new precast concrete 12’ diameter wetwell with two internal submersible pumps and a grinder capable of handling solids and non-woven materials. The lift station shall include a control system with alarms, a 6-inch emergency by-pass line coming up above ground with an emergency connection fitting, pressure transducers and isolation valves. The overall design configuration is to largely match Berkley County Pump Station configuration. The valves and flow meter shall be placed above ground on concrete pad for ease of maintenance and to avoid confined space permit requirements.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

The drawdown test and run times have been provided for determining the design pump flow.

However, the pumps were selected based on the pump flow from the existing pump data information as shown in the Calculation Reference section. The drawdown test identified an existing flow of 128 GPM that was less than the flow identified in the existing pump data of 272 GPM. However, 600 GPM was used to provide a minimum required pipe velocity for 8” existing pipe diameter. The pump Total Dynamic Head (TDH) was selected based on a comparison between the existing pump provided TDH of 37 feet and a conservatively calculated TDH of 58 feet for the above grade valve/meter placement. The selection was based on the larger TDH value of 58 feet. Please refer to calculations for further information. The duplex pump system is designed for only one pump to run and to handle the maximum flow with the remaining pumps to be utilized for redundancy and/or use during pump repairs or maintenance purposes.

Although the SOW specified a triplex system, the duplex system was determined to provide the necessary redundancy. The new grinder and flow meter have been sized to meet the same maximum design flow. The pumps will be installed with variable frequency drives.

Site Improvements - A perimeter chain link fence shall be provided to enclose the new lift stations and a vehicle parking area. The fence will include a manual swing gate to provide vehicle access. Canopies shall be installed to house new control panels under a roof structure.

Refer to Structural section for further information. Site grading and erosion control shall be required. The site is identified to be within the AE Zone of the flood map. The wetwell lid shall be an floodtight type to minimize infiltration. The wetwell vent opening shall be a minimum of 2 feet above the BFE. The immediate area surrounding the lift station system components will be placed with concrete pavement. In previous iterations of the design the surface elevation was designed to be above the BFE to meet that requirement. Flood protection requirements are met with the installation of site equipment above the BFE on supports, raised foundation slab along with generator riser track, and the floodtight wetwell access lid. The remainder of the site will be installed with asphalt pavement to 6” outside of the proposed permanent fence.

The existing water line that fed the demolished lift station building shall be terminated to outside of the new lift station components. For maintenance purposes, a new yard hydrant and BFP shall be provided. The existing waterline shown is based on JBC GIS and shall be field verified by the contractor.

Primary Power Distribution – The existing pole mounted site transformer will be utilized to provide a new electrical service for the new lift station.

Grounding - A new grounding system will be provided for the electrical service that consists of grounding electrode conductors, grounding electrodes and equipment grounding conductors.

Grounding conductors shall be copper and bonded as required by the NEC.

Secondary Power Distribution - The lift station will be provided with new electrical service conductors to a service entrance rated enclosed circuit breaker. A new underground feeder and control wiring will be provided from the new permanent diesel generator to a new manual

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099 transfer switch with camlock outlets for a temporary generator connection. The manual transfer switch will feed the automatic transfer switch. The automatic transfer switch will feed a 480Y/277 volt branch circuit panelboard that will serve a wet well pump panel and grinder pump panel. A 7.5 kVA step-down dry-type transformer will be provided to feed a 120/240 volt panelboard that will serve generator battery charger, generator heater, equipment canopy lights, telecom enclosure equipment and convenience receptacle loads. Electrical equipment and wet well control panel enclosures will be NEMA 4X rated and located outdoors underneath an equipment canopy. The wet well pumps shall be specified with a 460 voltage rating. A new 40kW diesel generator with weatherproof enclosure and 72 hour subbase fuel tank will be provided to provide backup power to the wet well electrical service. A dedicated outlet for a temporary generator battery charger and heater will be provided at the equipment canopy.

Exterior Lighting - Exterior lighting will consist of linear LED type lighting fixtures mounted underneath the equipment canopy and controlled by a manual switch.

Telecommunications - The existing telecommunications equipment enclosure will be mounted to the metallic support structure at the new equipment canopy. Conduit and wiring to match the existing installation will be provided and extended underground to the new telecommunications enclosure location as required.

4.4 STRUCTURAL NARRATIVE

4.4.1 Structural – General

A. The Structural Contractor shall read and comply with all drawings, relevant UFCs and Codes.

B. The latest effective publications of all applicable standards, codes, etc., as they apply, form part of these specifications as if were written fully herein and constitute minimum requirements. The following shall be referred to throughout in abbreviated form.

1. Savannah District Design Manual for Military Construction.

2. Applicable United Facilities Criteria (UFC).

3. Minimum Design Loads and Associated Criteria for Buildings and Other

Structures (ASCE 7-16).

4. International Building Code (IBC-2018).

5. Building Code Requirements for Structural Concrete and Commentary (ACI 318-

11).

6. Building Code Requirements for Masonry Structures (ACI 530-13).

7. Steel Construction Manual (AISC 360-17).

8. American National Standards Institute (ANSI).

9. American Society for Testing and Materials (ASTM).

10. Occupational Safety and Health Administration (OSHA 29 CFR 1910).

11. Fire Protection and Life Safety National Fire Protection Association 1: Fire Code

(NFPA 1).

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

The scope of this project consists of the design of three canopy structures to cover electrical equipment and backup generators. Structural also is tasked with the design of an equipment rack to mount the electrical equipment to for each canopy. The design basis of these canopies is based on the largest one. The largest of these canopies will be 16’ long by 5’-6” wide and 8’ tall with a mono-slope roof with a minimum roof pitch. The canopies are open air structures and will be designed for dead, live, seismic, and wind loads. The equipment racks shall be placed inside the footprint of the canopy and shall be constructed of structural steel and be designed for dead, seismic, and wind loads. Both the canopy and equipment rack will be constructed on a 12” thick reinforced concrete slab on grade and will be designed as steel special cantilever column systems.

4.4.2 Structural - Special Design Features

4.4.2.1 Anti-Terrorism/Force Protection (AT/FP) Features

These structures are classified as uninhabited and therefore do not need to meet the AT/FP requirements of UFC 4-010-01.

4.4.3 Structural – Preliminary Structural Design Analysis

4.4.3.1 Design Loads:

Roof Live Loads: Ordinary flat, pitched, and curved roofs 20 psf

Slab Live Loads: Platforms (assembly) 100 psf Snow Loads Ground Snow Load Pg 10 psf

Flat Roof Snow Load Pf 8 psf Snow Exposure Factor Ce 0.9 Snow Load Importance Factor 1.0 Thermal Factor Ct 1.2 Slope Factor Cs 1.0

Wind Loads Basic Wind Speed 129 mph Exposure C Surface Roughness C Design Wind Pressure 30.8 psf Wind Normal to Roof Ridge Design Pressure ±31.4 psf Wind Parallel to Roof Ridge Design Pressure ±20.9 psf

Seismic Loading: Site Class D (assumed)

0.2 Second SS 1.771g

1.0 Second S1 0.525g

0.2 Second SDS 1.417g

1.0 Second SD1 0.621g

Seismic Design Category D

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

Seismic Force Resisting Steel Special Cantilever System Column Systems Response Modification Factor 2.0 Overstrength Factor 1.25 Seismic Response Coefficient CS = 0.567 Seismic Base Shear 3.4 kips Secondary Base Shear 1.14 kips Analysis Procedure Used Equivalent Lateral Force

Procedure

4.4.3.2 Crane Loads

N/A

4.4.3.3 Material Strengths and Allowable Stresses

Structural Steel

A. W-Shapes (ASTM A992) ......................................................................................... 50,000psi B. Rectangular HSS (A500 Grade C) ........................................................................... 50,000psi C. Plate steel (ASTM A36) .......................................................................................... 36,000psi

Reinforcing Steel

A. Yield Stress (Grade 60) ........................................................................................... 60,000psi

Reinforced Concrete

A. Concrete Compressive Strength (Foundations) ....................................................... 4,000psi

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

5.0 NARRATIVE - LIFT STATION 730

5.1 EXISTING CONDITIONS

Lift Station 730 is Located on Pulaski Street, North of the intersection of Von Steuben Street & Pulaski Street. Its exact age is unknown, but per JBC it was last renovated circa 1991. LS 730 is a dry well type lift station. The station consists of a reinforced concrete pump chamber with 2 flooded suction pumps (30 HP and 460 V). On top of the pump chamber there is an electrical building with a roof structure housing control panels and electrical equipment. Outside the building there is a rectangular open top wet well divided in chambers which includes a grinder mounted at the inlet. A flow meter vault is also part of the lift station layout. The depth of the pump chamber and wet well are approximately 20 ft.

The building pole mounted electrical service transformers will remain to serve a new electrical service for the new wet well. There is an existing telecommunications equipment enclosure used for lift station monitoring and controls mounted on the building exterior. The telecom.

equipment enclosure will be retained. The outdoor diesel generator with subbase tank is not operational and will be replaced.

FIGURE 5-1. LS 730

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

A review of FEMA flood map 45015C0705E by the design team, shows that the lift station is located inside a Zone X(0.2% Annual Chance Flood Hazard, Areas of 1% annual chance flood with average depth less than one foot or with drainage areas of less than one square mile).

FIGURE 5-2. LS 730 FLOOD MAP

5.2 DEMOLITION

The demolition will include removal of the wet well, brick building and pump room, and small sections of force main and gravity sewer line. The lift station site has drywell pump control panels, generator automatic transfer switch, electrical panelboards, pump variable frequency drives, dry-well pumps and lighting fixtures that are operational and will be removed.

Associated equipment conduit and conductors will be removed. The outdoor diesel generator with subbase tank is not operational and will require replacement.

5.3 SITE IMPROVEMENTS

New Lift Station – The new lift station shall include a new precast concrete 12’ diameter wetwell with two internal submersible pumps and a grinder capable of handling solids and non-woven materials. The wetwell will be installed with a pressure transducer along with four floats to accurately determine the level. The lift station shall include a control system with alarms, a 6-inch emergency by-pass line coming up above ground with an emergency connection fitting, and pressure transducers, and isolation valves. A flow meter shall be installed on a pad above ground.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

The drawdown test and run times have been provided for determining the design pump flow.

However, the pumps were selected based on the pump flow from the existing pump data information as shown in the Calculation Reference section. The drawdown test identified an existing flow of 572 GPM that was less than the flow identified in the existing pump data of 750 GPM. The pumps were sized based on the existing provided Total Dynamic Head (TDH) which provided a 750 GPM design flow. The pump TDH was selected based on a comparison between the existing pump provided TDH of 78 feet and a conservatively calculated TDH of 77 feet for the above grade valve/meter placement. The selection was based on the slightly larger TDH value of 78 feet. Please refer to calculations for further information. The duplex pump system is designed for only one pump to run and to handle the maximum flow with the remaining pumps to be utilized for redundancy and/or use during pump repairs or maintenance purposes.

Although the SOW specified a triplex system, the duplex system was determined to provide the necessary redundancy. The new grinder and flow meter have been sized to meet the same maximum design flow. The pumps will be installed with variable frequency drives.

Site Improvements - A perimeter chain link fence shall be provided to enclose the new lift stations and a vehicle parking area. The fence will include a manual swing gate to provide vehicle access. Canopies will be required to house new control panels under a roof structure.

Minor grading and erosion control shall be required. The site has been shifted slightly to the southeast to avoid being within the Zone X flood hazard area shown above. The immediate area surrounding the lift station system components will be placed with concrete pavement. The remainder of the site will be installed with asphalt pavement to 6” outside of the proposed permanent fence. The existing water line that fed the demolished lift station building shall be terminated to outside of the new lift station components. For maintenance purposes, a new yard hydrant and BFP shall be provided. The existing waterline shown is based on JBC GIS and shall be field verified by the contractor.

Primary Power Distribution - The existing pole mounted site transformers will be utilized to provide a new electrical service for the new lift station.

Grounding - A new grounding system will be provided for the electrical service that consists of grounding electrode conductors, grounding electrodes and equipment grounding conductors.

Grounding conductors shall be copper and bonded as required by the NEC.

Secondary Power Distribution - The lift station will be provided with new electrical service conductors to a service entrance rated enclosed circuit breaker. A new underground feeder and control wiring will be provided from the new permanent diesel generator to a new manual transfer switch with camlock outlets for a temporary generator connection. The manual transfer switch will feed the automatic transfer switch. The automatic transfer switch will feed a 480Y/277 volt branch circuit panelboard that will serve a wet well pump panel and grinder pump panel. A 7.5 kVA step-down dry-type transformer will be provided to feed a 120/240 volt panelboard that will serve generator battery charger, generator heater, equipment canopy lights, telecom enclosure equipment and convenience receptacle loads. Electrical equipment

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099 and wet well control panel enclosures will be NEMA 4X rated and located outdoors underneath an equipment canopy. The wet well pumps shall be specified with a 460 voltage rating. A new 50kW diesel generator with weatherproof enclosure and 72 hour subbase fuel tank will be provided to provide backup power to the wet well electrical service. A dedicated outlet for a temporary generator battery charger and heater will be provided at the equipment canopy.

Exterior Lighting - Exterior lighting will consist of linear LED type lighting fixtures mounted underneath the equipment canopy and controlled by a manual switch.

Telecommunications - The existing telecommunications equipment enclosure will be mounted to metallic support structure at the new equipment canopy. Conduit and wiring to match the existing installation will be provided and extended underground to the new telecommunications enclosure location as required.

5.4 STRUCTURAL NARRATIVE

The structural design is a general design that encompasses all three lift stations. The equipment pad/rack for LS 709 was the largest of the three and is used as the basis of this design. Please see the structural narrative for LS 709 for further information.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

6.0 NARRATIVE - LIFT STATION 1389

6.1 EXISTING CONDITIONS

Lift Station 1389 is Located on the north side of Pulaski Street across from Petrel Street. Its exact age is unknown, but per JBC it was built or last renovated circa 1983. LS 1389 is a dry well type lift station. The station consists of a reinforced concrete pump chamber with 2 flooded suction pumps (40 HP and 230 V). On top of the pump chamber there is an electrical building with a roof structure housing control panels and electrical equipment. Outside the building there is a rectangular open top wet well divided in chambers which includes a grinder mounted at the inlet. A flow meter vault is also part of the lift station layout. The depth of the pump chamber and wet well are approximately 20 ft. This lift station is not inside a Flood zone area.

The building pad mounted electrical service transformer will remain to serve a new electrical service for the new wet well. There is an existing outdoor diesel generator with subbase tank.

There is an existing telecommunications equipment enclosure used for lift station monitoring and controls mounted on the building exterior. The telecom equipment enclosure will be retained.

FIGURE 6-1. LS 1389

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

6.2 DEMOLITION

The demolition will include removal of the wet well, brick building and pump room, and small sections of force main and gravity sewer line. The lift station site has drywell pump control panels, diesel generator, generator automatic transfer switch, electrical panelboards, pump variable frequency drives, dry-well pumps and lighting fixtures that are operational and will be removed. Associated equipment conduit and conductors will be removed.

6.3 SITE IMPROVEMENTS

New Lift Station – The new lift station shall include a new precast concrete 12’ diameter wetwell with two internal submersible pumps and a grinder capable of handling solids and non-woven materials. The wetwell will be installed with four floats to accurately determine the level. The lift station shall include a control system with alarms, a 6-inch emergency by-pass line coming up above ground with an emergency connection fitting, pressure transducers, and isolation valves.

The drawdown test and run times have been provided for determining the design pump flow.

However, the pumps were selected based on the pump flow from the existing pump data information as shown in the Calculation Reference section. The drawdown test identified an existing flow of 208 GPM that was less than the flow identified in the existing pump data of 675 GPM. The pumps were sized based on the existing provided Total Dynamic Head (TDH) of which provided an 800 GPM design flow. The pumps were sized based on the existing provided TDH which provided a 750 GPM design flow. The pump TDH was selected based on a comparison between the existing pump provided TDH of 113 feet and a conservatively calculated TDH of 101 feet for the above grade valve/meter placement. The selection was based on the larger TDH value of 113 feet. Please refer to calculations for further information. Although the SOW specified a triplex system, the duplex system was determined to provide the necessary redundancy. The new grinder and flow meter have been sized to meet the same maximum design flow. The pumps will be installed with variable frequency drives.

Site Improvements - A perimeter chain link fence shall be provided to enclose the new lift stations and a vehicle parking area. The fence will include a manual swing gate to provide vehicle access. Canopies will be required to house new control panels under a roof structure.

Minor grading and erosion control shall be required. The immediate area surrounding the lift station system components will be placed with concrete pavement. The remainder of the site will be installed with asphalt pavement to 6” outside of the proposed permanent fence. The existing backflow preventer(BFP) shall be removed, stored, and salvaged for the government.

The existing water line that fed the demolished lift station building shall be terminated to outside of the new lift station components. For maintenance purposes, a new yard hydrant and BFP shall be provided.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007

May 2023 Delivery Order No.: FA441822F0099

Primary Power Distribution - The two existing pad mounted site transformers will be utilized to provide a new electrical service for the new wet well.

Grounding - A new grounding system will be provided for the electrical service that consists of grounding electrode conductors, grounding electrodes and equipment grounding conductors.

Grounding conductors shall be copper and bonded as required by the NEC.

Secondary Power Distribution - The lift station will be provided with new electrical service conductors to a service entrance rated enclosed circuit breaker. A new underground feeder and control wiring will be provided from the existing permanent diesel generator to a new manual transfer switch with camlock outlets for a temporary generator connection. The manual transfer switch will feed the automatic transfer switch. The automatic transfer switch will feed a 120/240 volt branch circuit panelboard that will serve wet well panel, grinder panel, shelter lights, generator battery charger, generator heater, telecom enclosure equipment and convenience receptacle loads. Electrical equipment and wet well control panel enclosures will be NEMA 4X rated and located outdoors underneath an equipment canopy shelter.

The wet well motors shall be specified with a 240 voltage rating. An existing 80kW diesel generator with weatherproof enclosure and 72 hour subbase fuel tank will be utilized to provide backup power to the wet well electrical service. A dedicated outlet for a temporary generator battery charger and heater will be provided at the equipment canopy.

Exterior Lighting - Exterior lighting will consist of linear LED type lighting fixtures mounted underneath the equipment canopy shelter and controlled by a manual switch.

Telecommunications - The existing telecom. equipment enclosure will be mounted to metallic support structure at the new equipment canopy shelter. Conduit and wiring to match the existing installation will be provided and extended underground to the new telecommunications enclosure location as required.

6.4 STRUCTURAL NARRATIVE

The structural design is a general design that encompasses all three lift stations. The equipment pad/rack for LS 709 was the largest of the three and is used as the basis of this design. Please see the structural narrative for LS 709 for further information.

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007 May 2023 Delivery Order No.: FA441822F00992

Project No.: DKGV-1083977

DESIGN ANALYSIS - APPENDICES

TABLE OF CONTENTS

APPENDICES

Appendix A Appendix C Appendix D

Hazardous Materials Assessment Pump Drawdown Testing & Run Time Permitting Forms

Joint Base Charleston, SC

ZAPATA Contract No.: FA441822D0007 May 2023 Page A Delivery Order No.: FA441822F00992

Project No.: DKGV-1083977

Appendix A

Hazardous Materials Assessment

Project DKGV 1083977 – Repair Various Dry Well Lift Stations

Joint Base Charleston Weapons Station Berkeley County, South Carolina 29404

August 2022

Prepared for:

ZAPATA, Inc.

6302 Fairview Road, Suite 600 Charlotte, North Carolina 28210

Prepared by:

Pond and Company

3500 Parkway Lane, Suite 500 Peachtree Corners, Georgia 30092

August 1, 2022

Shane Smith, PE, LEED BD+C Senior Vice President ZAPATA, Inc.

6302 Fairview Road, Suite 600 Charlotte, North Carolina 28210

Subject: Project DKGV 1083977 – Repair Various Dry Well Lift Stations Joint Base Charleston Weapons Station

Berkeley County, South Carolina

Dear Mr. Smith, Pond and Company (Pond) is pleased to submit this report of our Hazardous Materials Assessment (HMA) for the above referenced project. We appreciated the opportunity to assist you with this project and look forward to our continued participation. Please contact us if you have any questions or if we can be of further assistance.

Sincerely, Bill Watts Glenn Martin Environmental Scientist Principal | Director WattsB@Pondco.com MartinGl@Pondco.com mailto:WattsB@Pondco.com mailto:MartinGl@Pondco.com

Joint Base Charleston Lift Stations Repair August 2022 Hazardous Materials Assessment Table of Contents

TABLE OF CONTENTS

SECTION 1. EXECUTIVE SUMMARY

SECTION 2. INTRODUCTION

2.1 Site Location

2.2 Purpose

2.3 Scope of Work

SECTION 3. INVESTIGATION

3.1 Asbestos Containing Material Survey

3.1.1 Visual Assessment

3.1.2 Physical Assessment

3.1.3 Sample Collection

3.2 Lead-Based Paint Survey

3.2.1 Visual Assessment

3.2.2 XRF Testing

3.2.3 Sample Collection

SECTION 4. ANALYTICAL TESTING RESULTS

4.1 Asbestos Containing Material Analytical Testing Results

4.2 Lead-Based Paint Analytical Testing Results

SECTION 5. CONCLUSIONS

ATTACHMENTS:

FIGURE 1 PROJECT SITE MAP

FIGURE 2 ASSESSMENT LOCATIONS MAP

FIGURE 3 LIFT STATION 66 MAP

FIGURE 4 LIFT STATION 310 MAP

FIGURE 5 LIFT STATION 709 MAP

FIGURE 6 LIFT STATION 730 MAP

FIGURE 7 LIFT STATION 1389 MAP

ATTACHMENT A SAMPLING LOCATIONS PHOTOLOG

ATTACHMENT B LABORATORY ANALYTICAL RESULTS

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SECTION 1. EXECUTIVE SUMMARY

Pond and Company (Pond) has completed a Hazardous Material Assessment (HMA) for five (5) dry well sewage lift stations, located within Joint Base Charleston in North Charleston, Berkeley County, South Carolina. This property, which constitutes the project area, will hereafter be referred to as the Project Site (Figures 1 and 2).

The HMA was performed at the five (5) lift stations on July 15, 2022. The lift stations are scheduled to be renovated/repurposed. The HMA included pre-renovation asbestos survey, polarized light microscopy (PLM) bulk sampling for asbestos content, non-destructive X-Ray Florescence (XRF) testing, and limited paint chip sampling for lead content. Results from HMA are briefly summarized below. Please reference the following sections for a detailed account of the HMA findings.

The five (5) lift stations within the Project Site are identified as the following: Lift Station 66, Lift Station 310, Lift Station 709, Lift Station 730, and Lift Station 1389 (Figures 3 through 7).

Based on results of the visual and physical assessments, six (6) bulk samples of suspect ACM were collected in accordance with EPA sampling protocols (see Attachment A for the sampling locations photolog).

Asbestos was non-detect at all sampling locations.

Based on results of the visual assessment and XRF testing, 13 paint chip samples of suspect LBP were collected in accordance with the sample collection protocols established in the U.S. Department of Housing and Urban Development HUD’s Guidelines for the Evaluation and Control of Lead-Based Paint Hazards in Housing (see Attachment A for the sampling locations photolog).

Lead was detected at concentrations above the EPA definition of lead-based paint (0.5% by dry weight as determined by laboratory analysis) on the bollard and ladder at Lift Station 709, the grate at Lift Station 730, the grate, bollard, and ladder at Lift Station 1389, and the grate at Lift Station 66. Within each lift station, every ladder, bollard, and grate were painted with the same yellow paint and should be assumed to be lead-containing. Lead was also detected at concentrations above the EPA definition of lead-based paint on the wood panel behind the transfer switches at Lift Station 730. Lead was not detected on the wood panel at Lift Station 709, and wood panels were not present in Lift Station 66, Lift Station 310, and Lift Station 1389.

Lead was detected on the south exterior door of Lift Station 310 and on the HVAC duct of Lift Station

709. However, the paint chip samples yielded lead concentrations below the EPA definition for lead-based paint.

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SECTION 2. INTRODUCTION

2.1 Site Location

The Project Site (approximately 32.97194, -79.98789) consists of five (5) dry well sewage lift stations under the jurisdiction of the United States Air Force 628th Air Base Wing, Air Mobility Command. It is located within the Joint Base Charleston in North Charleston, Berkeley County, South Carolina (Figure 1). The five (5) lift stations within the Project Site are identified as the following: Lift Station 66, Lift Station 310, Lift Station 709, Lift Station 730, and Lift Station 1389. Lift Station 66 is located west of the Nuclear Power Training Unit. Lift Station 310 is located east of the intersection of Pomflant Access Road and South Freedom Drive. Lift Station 709 is located west of Jefferson Avenue, about 150 yards north of the Boone Avenue intersection. Lift Station 730 is located north of the Von Steuben Street and Pulaski Street intersection. Lift Station 1389 is located on the north side of Pulaski Street, across from Petrel Street. The assessment locations are shown in Figures 3 through 7.

2.2 Purpose

Pond was directed by ZAPATA, Inc. to perform a Hazardous Materials Assessment (HMA) of the Project Site.

The purpose of the HMA was to identify and sample suspect asbestos-containing material (ACM) and lead-based paint (LBP) throughout the internal and external features of the five (5) lift stations that will be repurposed on the Project Site.

2.3 Scope of Work

The scope of this assessment included the following items as outlined on the proposal dated March 24, 2022:

Conduct a visual inspection of each building/structure and take representative photographs of pertinent site features.

Within each building/structure, record all friable material, thermal system insulation, and miscellaneous materials that may suggest the presence of asbestos. Perform surface-by-surface X- Ray Florescence (XRF) analysis throughout each building/structure.

Collect ACM bulk samples for laboratory polarized light microscopy (PLM) analysis and paint chip samples for laboratory LBP analysis, when appropriate (see Attachment A for the sampling location photolog and Attachment B for laboratory analytical results).

The ACM assessment will be performed in accordance with Environmental Protection Agency (EPA) guidance document 560/5-85-030a, in order to identify ACM, if any. The LBP assessment will be performed in accordance with U.S. Department of Housing and Urban Development (HUD)’s Guidelines for the Evaluation and Control of Lead-Based Paint Hazards in Housing, in order to identify LBP, if any.

Upon receipt of laboratory analysis, Pond will prepare a written report detailing our findings and conclusions that reflects all information gathered during the investigation.

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SECTION 3. INVESTIGATION

3.1 Asbestos Containing Material Survey

The ACM survey was conducted on July 15, 2022 by Mr. Bill Watts and Mr. Robi McGarvey. The survey was conducted in accordance with the sample collection protocols established in EPA guidance document 560/5- 85-030a. A summary of the survey activities is provided below.

3.1.1 Visual Assessment

The survey activities were initiated with visual observation of the accessible exterior and interior of each lift station. A homogeneous area consists of building materials that appear similar throughout in terms of color and texture with consideration given to the date of the application. The assessment was conducted in physically accessible areas of the lift stations. The lift station roofs were not accessible during this ACM survey and were, therefore, not assessed. Although reasonable effort was made to assess accessible suspect materials, additional suspect but non-sampled materials could be located within pipe flanges or in other concealed areas. Building materials identified as concrete, glass, fiberglass, wood, masonry, metal, or rubber were not considered suspect ACM.

3.1.2 Physical Assessment

A physical assessment of each homogeneous area of suspect ACM was conducted to assess the friability and condition of the materials. A friable material is defined by the EPA as a material that can be crumbled, pulverized, or reduced to powder by hand pressure when dry. Friability was assessed by physically touching suspect materials.

3.1.3 Sample Collection

Based on results of the visual and physical assessments, bulk samples of suspect ACM were collected in accordance with EPA sampling protocols. Samples of suspect materials were collected from randomly selected locations in each homogeneous area. Bulk samples were placed in sealable containers and labeled with unique sample numbers using indelible marker. Samples were submitted to an accredited laboratory (Analytical Environmental Services, Inc.) for PLM analysis.

The selection of sample locations and frequency of sampling were based on Pond’s observations and the assumption that like materials in the same area are homogeneous in content.

Pond did not perform sampling requiring demolition or destructive activities such as knocking holes in walls, dismantling equipment, or removing protective coverings. Electrical systems associated with the lift stations were assumed energized at the time of the survey, and therefore, were not sampled.

Pond collected six (6) samples from areas of suspect ACM. A summary of suspected ACM samples collected during the assessment is found in Section 4.1.

3.2 Lead-Based Paint Survey

In conjunction with the asbestos survey, Pond conducted a survey of components in representative areas to identify, test, and assess the condition of accessible painted surfaces suspected of containing lead. The lift station roofs were not accessible during this LBP survey and were, therefore, not assessed. The survey was conducted in accordance with the sample collection protocols established in HUD’s Guidelines for the Evaluation and Control of Lead-Based Paint Hazards in Housing. A summary of the survey activities is provided below.

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3.2.1 Visual Assessment

The survey activities began with a surface-by-surface visual observation of the interior and exterior components of the five (5) lift stations. Representative photographs were taken of the pertinent site features.

3.2.2 XRF Testing

Based on results of the visual assessment, selected locations of representative suspect paint were tested using a Thermo Fisher Niton XL3t Goldd XRF Analyzer. The Niton XL3t is a portable electronic device containing a small, sealed x-ray tube used as a field screening tool to identify lead concentration in painted surfaces. The device emits an x-ray beam at various energy levels. The x-ray energy excites electrons in the outer orbits of lead atoms. The detector in the XRF unit reads this excitation and translates it into a semi-quantitative reading of lead present by surface area. XRF technology allows detection of lead in a painted surface, even several layers below the surface, without disturbing the painted surface. The instrument was used in accordance with the manufacturer’s guidelines. Calibration checks were performed in the field prior to commencement of testing and again at the completion of testing. The instrument was determined to be properly calibrated during the testing.

3.2.3 Sample Collection

When an area yielded a positive XRF reading, a paint chip sample was collected from the corresponding area’s surface. Paint chip sampling resulted in damage to a small area (approximately four square-inches) of painted surface at each sample location. Pond was not responsible for repainting sampled surfaces. Paint chip samples were placed in sealable containers and labeled with unique sample numbers using indelible marker.

Samples were submitted to a National Lead Laboratory Accreditation Program (NLLAP) laboratory (Analytical Environmental Services, Inc.) for total lead in paint analysis.

Pond collected 13 paint chip samples. A summary of suspected LBP samples collected during the assessment is found in Section 4.2. The ladders and bollards in Lift Station 709, Lift Station 730, and Lift Station 1389 all yielded positive XRF readings. However, to avoid sample redundancy, paint chip samples were only collected from the ladders in Lift Station 709 and Lift Station 1389, and paint chip samples were only collected from the bollards at Lift Station 709 and Lift Station 1389. Similarly, grates in all five lift stations yielded positive XRF readings, but paint chip samples were only collected from Lift Station 66, Lift Station 730, and Lift Station 1389.

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SECTION 4. ANALYTICAL TESTING RESULTS

4.1 Asbestos Containing Material Analytical Testing Results

ACM analytical testing results are summarized in Table 1 (below) and laboratory analytical reports are included in Attachment B. The National Emission Standards for Hazardous Air Pollutants (NESHAP) defines friable ACM as a material containing more than 1% asbestos that, when dry, may be crumbled, pulverized, or reduced to powder by hand pressure. As shown in Table 1, asbestos was non-detect at all sampling locations.

Table 1: ACM Analytical Testing Results

Sample ID Sample Location Sample Description

Asbestos Mineral Percentage Lab Comments

CH AM CR AN TR AC

ACM-1 Lift Station 310 Insulation in upstairs southeastern corner

ACM-2 Lift Station 730 Putty on exterior northern wall

ACM-3 Lift Station 730 HVAC duct mastic tape on southern wall

Paint included as binder

ACM-4 Lift Station 1389 Putty on exterior southern wall

ACM-5 Lift Station 1389 Insulation in northern wall - - - - - -

ACM-6 Lift Station 66 Putty on northern wall - - - - - -

Notes: Dashed line (-) = Parameter not detected above Method Detection Limit CH = Chrysotile AM = Amosite CR = Crocidolite AC = Actinolite TR = Tremolite AN = Anthophyllite

4.2 Lead-Based Paint Analytical Testing Results

LBP analytical testing…