Waterfront Substation October 29, 2015 Project Update I Pepco - PowerPoint PPT Presentation

Waterfront Substation October 29, 2015

Project Update I Pepco Holdinqs Inc 2

~ ~ Waterfront Substation • Project Phase Progress • Phase 1: Regulatory authorization and zoning • BZA approval received in March 2015 and DC PSC approval in April 2015 QStSW • Phase 2: Substation site preparation Waterfront • Substation Environmental assessment finished and demolition will complete in early November 2015 nc W; d Impacted • Phase 3: Design & construction of the substation, St<eets transmission and distribution lines • Detail engineering and permitting is underway • Distribution construction beginning Nov 2015 S St SW ..... • Transmission construction beginning Dec 2015 ..... VI Buzzard Pt - • Substation construction beginning Jan 2016 "' . Substation .. G-, l- ) "O C N I Pepco Holdings Inc 3

Waterfront Substation Project Schedule June – November 2015 Prepare Waterfront Site for Construction July 2015 – July 2016 Award EPC Contract; Perform Detail Engineering Obtain Building Permit January 2016 January 2016 – April 2017 Construct Substation Building August 2016 – April 2017 Install Electrical Equipment May 2017 – June 2017 Initial Transfer of Electrical Load I Pepco Holdinqs Inc 4

Demolition Update I Pepco Holdinqs Inc 5

Demolition Update • Pepco contractor Northstar performed demolition of existing Lyon Bakery and ANA towing office buildings • Demolition phase is nearing completion I Pepco Holdings Inc 6

Demolition – Measures & Controls • Water spraying mounted hose and nozzles for dust suppression • Continuous humidity/moisture content in the construction debris • Prevention of dust from becoming airborne • Portable water tanks cover smaller blanket of airborne dust areas without blowing any water or dust laden mist outside the property limits Construction vehicles cleaned prior to departing construction site I Pepco Holdings Inc 7

Demolition – Vector Control & Abatement • Northstar placed ten bait stations around the perimeter of the site prior to demolition • Department of Health bureau of community hygiene and rodent control division inspected the site on July 28th 2015 and issued clearance certification • The contractor also hired Critter Control (Rodent Control company) as secondary measures • Bait stations inspections reveal no evidence of rodents • Northstar has requested follow up DOH site inspection post demolition 8 Pepco Holdings nc

Demolition – Site Controls • Installation of Stabilized Construction Entrance, silt fence and super silt fence as part of the Erosion and Sediment control measures • Construction debris and Asbestos containing building material segregated, covered and hauled off site for disposal I Pepco Holdings Inc 9

Substation Engineering & Construction Update I Pepco Holdinqs Inc 10

Waterfront Substation Construction January 2016 - April 2017 • 60% detail design complete • Pepco will install up to 20,000 sf of PV Panels on the roof of the substation for station service I Pepco Holdings Inc 11

About ABB USA ABB USA is a world leader in power • technology ABB is working with Pepco to enhance • Pepco’s transmission network in Washington DC – improving reliability and efficiency with this advanced substation I Pepco Holdings Inc 12

About Coakley & Williams Construction, Inc. Founded in 1961 CREBA Recently Ranked Us Best Contractor Award Winning Technology Services Sustainable Construction 215 Industry Awards Strong, Local Relationships 2 13

About Coakley & Williams Construction, Inc. 2 14

~ Waterfront Substation Landscape i t:i (J) 0 z N PEPCO WATERFRONT SUBSTATION #223 I Pepco Holdings Inc 15

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Waterfront Substation Landscape Plant Palette I Pepco Holdings Inc 18

Transmission Engineering & Construction Update I Pepco Holdinqs Inc 19

Overall Underground Transmission and Distribution  Map on slide 20 was removed • Underground Transmission (Under Construction) from the original presentation • Underground Transmission Lines Phase 1 for publication on website • Underground Transmission Lines Phase 2 • Future Ductbank on New Bridge • Underground Distribution Lines I Pepco Holdings Inc 20

Underground Transmission Lines  Map on slide 21 was removed from 138kV Underground Lines the original presentation for between Buzzard Point publication on website Substation and Waterfront Substation. Construction: December 2015  March 2017 Ductbank for future Underground Transmission Feeders Construction: March 2016  July 2017 I Pepco Holdinqs Inc 21

Underground Transmission Installation Video www.pepco.com/Underground-Construction.aspx I Pepco Holdinqs Inc 22

Distribution Engineering & Construction Update I Pepco Holdinqs Inc 23

Distribution Conduit Phase 1: November 2015 - April 2016  Map on slide 24 was removed from the original presentation for publication on website I Pepco Holdinqs Inc 24

Traffic Control ·- - ~ 25

Potential Yard Disturbance  Map on slide 26 was removed from the original presentation for publication on website I Pepco Holdings Inc 26

Distribution Conduit Phase 2: 2017 and beyond  Map on slide 27 was removed from the original presentation for publication on website I Pepco Holdinqs Inc 27

Questions I Pepco Holdinqs Inc 28

Appendix I Pepco Holdinqs Inc 29