J_2024 05 09_West Orange Stormwater Management Plan

PSE&G West Orange Switching Station West Orange, NJ Stormwater Management Report 4. Stormwater Quality Requirements For Major Development sites, NJDEP requires 80% TSS reduction for the NJDEP water quality storm event (1.25 inches over 2 hours). To demonstrate compliance with the water quality requirement NJDEP has adopted TSS removal rates for each of the Best Management Practices in the Chapter 9 of the NJDEP Stormwater BMP Manual. TRC has selected the AquaFilter/AquaSwirl manufactured treatment device for the NJDEP water quality storm. The system, manufactured by AquaShield Inc., is certified by NJDEP with a TSS removal rate for the AquaFilte/Aquaswirl is 80%. The system is to be installed under the access road south of MH-12 to filter out sediments collected in stormwater flows from the east side of the existing station. See Appendix F for detailed spec sheets from AquaShield Inc., regarding the system. In addition, a series of bioretention basins will be placed alongside the main access road directly west of the new pad to provide an 80% TSS removal rate. The basins will allow sediments from the stormwater to settle out before stormwater flows reach CB #1. Section IV: Stormwater Maintenance Schedule The stormwater management system for the proposed West Orange Switching Station Expansion Project will consist of monitoring the Aqua-Swirl/Aqua-Filter system, inspection of the transformer secondary containment area and insuring that yard stone surfaces remain in place. Maintenance activities will include the following: 1. Refer to Appendix F for maintenance of the Aqua-Swirl/Aqua-Filter system. 2. After every storm event exceeding one inch (1”) of rainfall: PSE&G shall inspect to determine that basins drain completely within seventy-two (72) hours after the storm event. If stored water fails to infiltrate seventy-two (72) hours after the end of the storm, corrective measures shall be investigated and taken as required. Remove sediment and encrusted build up avoiding mixing with native topsoil, rake or till by light equipment to restore detention capacity of particular areas. 3. Once per month (or sooner as seasonal growth necessitates): PSE&G shall remove litter and debris from the basin area, and then mow top, banks and bottom to maintain a height of between 2 to 6 inches collecting and disposing all clippings off-site. 4. Four times per year

l remove litter and debris from the basin area, and then mow top, banks and bottom to maintain a height of between 2 to 6 inches collecting and disposing all clippings off-site. 4. Four times per year (quarterly): PSE&G shall inspect stormwater basins for clogging, debris and sediment accumulation - remove as needed. Check for signs of damage to structures and erosion of banks and bottom - repair as needed. Observe for signs of petroleum contamination - remediate as needed. 5. Once per year: PSE&G shall inspect basins for undesirable plant growth such as trees, woody vegetation, weeds, etc., and remove as necessary. 6. PSE&G will inspect the yard stone surface of the switching station pad on a monthly basis to ensure it remains in place. Any evidence of off-site erosion will be corrected prior to the next expected rainfall event. TRC Engineers, Inc. 15 March 2012

PSE&G West Orange Switching Station West Orange, NJ Stormwater Management Report Section V: Soil Erosion and Sediment Control During construction, the potential for soil erosion and sedimentation will be controlled through the use of temporary soil erosion and sediment control measures. This will include silt fencing, straw bale barriers and stabilized construction entrances. The soil erosion and sediment control plan is shown on Drawing No. 331311 entitled “Soil Erosion & Sediment Control Plan.” Erosion and sediment control notes are included on Drawing No. 3313310 entitled “Soil Erosion & Sediment Control Notes and Details”. The soil erosion and sediment control measures will minimize the downstream erosion hazard by controlling runoff at its source, minimize runoff from disturbed areas and de­ concentrate stormwater runoff. Section VI: Conclusion The West Orange Switching Station Expansion Project will disturb approximate 10.3 acres of land located within the existing switching station pad and transmission line ROW. It is TRC’s professional opinion that the proposed improvements to the site have been designed in accordance with these requirements and can be constructed without negatively impacting offsite drainage characteristics. TRC Engineers, Inc. 16 March 2012

PSE&G West Orange Switching Station West Orange, NJ Stormwater Management Report Appendix A - NRCS Soils Data and Information TRC Engineers, Inc. March 2012

Soil Map-Essex County, New Jersey 5 in 300 562400 562500 562600 I 40* AT AT 562700 562800 562900 563000 40* AT AT * M (N 40* AT 5" 562300 562400 562500 562600 562700 562900 Map Scale: 1:5,410 if printed on A size (8.5" x 11") sheet. A ySDA Natural Resources flSHi Conservation Service 100 400 iMeters 300 200 aFeet BOO 1.200 Web Soil Survey National Cooperative Soil Survey 10/10/2011 Page 1 of 3

Soil Map Units Borrow Pit til 69 Other Wet Spot Very Stony Spot Date(s) aerial images were photographed: 8/13/2006; 8/5/2006 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident US Routes Major Roads Local Roads Marsh or swamp Mine or Quarry Miscellaneous Water Perennial Water Rock Outcrop Saline Spot Sandy Spot els * • e V + v Slide or Slip Sodic Spot Spoil Area Stony Spot O i> * s 0 Natural Resources Conservation Service Sinkhole Severely Eroded Spot Soil Survey Area: Essex County, New Jersey Survey Area Data: Version 8, Aug 18,2008 Interstate Highways Lava Flow A. IBS Transportation Rails Web Soil Survey National Cooperative Soil Survey Y:;' ;■ ’ . 10/10/2011 Page 2 of 3 This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov Coordinate System: UTM Zone 18N NAD83 Landfill Streams and Canals © **** Water Features Gravelly Spot A Please rely on the bar scale on each map sheet for accurate map measurements. Gravel Pit Cities X • Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Warning: Soil Map may not be valid at this scale. The soil surveys that comprise your AOI were mapped at 1:12,000. Map Scale: 1:5,410 if printed on A size (8.5" * 11") sheet. Closed Depression Political Features C? Other J2S Short Steep Slope Special Line Features ▲ a t MAP INFORMATION ♦ Clay Spot Blowout Special Point Features Soils Area of Interest (AOI) Area of Interest (AOI) MAP LEGEND Soil Map-Essex County, New Jersey

Soil Map-Essex County, New Jersey Map Unit Legend Essex County, New Jersey (NJ013) Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI BogBc Boonton loam, 0 to 8 percent slopes, extremely stony 1.1 0.9% BogCc Boonton loam, 8 to 15 percent slopes, extremely stony 6.3 5.3% DuuB Dunellen - Urban land, Dunellen substratum complex, 0 to 8 percent slopes 11.7 9.8% HanBc Haledon silt loam, 0 to 8 percent slopes, extremely stony 1.2 1.0% UdbonB Udorthents, Boonton substratum, 0 to 8 percent slopes 26.0 21.8% URBONB Urban land, Boonton substratum, 0 to 8 percent slopes 40.0 33.5% USBONB Urban land, Boonton substratum - Boonton complex, 0 to 8 percent slopes 32.9 27.6% YaobBc Yalesville - Boonton - Holyoke complex, 0 to 8 percent slopes, extremely stony 0.0 0.0% 119.1 100.0% Totals for Area of Interest Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/10/2011 Page 3 of 3

Hydrologic Soil Group-Essex County, New Jersey 562300 562400 562500 562600 562800 562700 562900 563000 40* 47* 42" 40* 47* 42" ^77^ .^,' ^ ' N -•m ■# Jffl •.Jv /' v- i V V Av ill r' #H m j? j? «0>v. * '(I 'fl' ■i \ rm^.- • /'** /A J fin'. 'Mg . • • Jf; j j ".vi/ #*j - V I -3 11 rr? . > . 9 ’ ■//’ * /v ■ O 1 M ;..r / /. •,:% j n /?■?"*-'! oI• i ,/ ! a - y % I 3 V-A r m. . •/ f o.'i' ■■■■--• i; & / v. ,I * ./'• *• . / ?/ / (f 7 r" i.A.1 ■ *S 40* 47* 5" 40* 47* 6" 562300 562400 562500 562700 562600 562800 562900 563000 Map Scale: 1:5,410 if printed on A size (8.5" x 11") sheet. A US 50 —i Maters 300 200 100 aFeet 200 Natural Resources Conservation Service 400 800 1,200 Web Soil Survey National Cooperative Soil Survey 10/10/2011 Page 1 of 4

C/D D □ m m x-v* §££ Transportation Roads Local Roads Major US Routes Interstate Highways Ralls Streams and Canals Cities Water Features O Political Features Conservation Service tKDA Natural Resources C □ Not rated or not available B B/D A/D □ u A Soil Map Units □ Soil Ratings Soils □ Area of Interest (AOI) Area of Interest (AOI) MAP LEGEND Web Soil Survey National Cooperative Soil Survey MAP INFORMATION Page 2 of 4 10/10/2011 The orthophoto or other base map on which the soil lines were compiled and digitized probably differs from the background imagery displayed on these maps. As a result, some minor shifting of map unit boundaries may be evident. Date(s) aerial images were photographed: 8/13/2006; 8/5/2006 Soil Survey Area: Essex County, New Jersey Survey Area Data: Version 8, Aug 18,2008 This product is generated from the USDA-NRCS certified data as of the version date(s) listed below. Source of Map: Natural Resources Conservation Service Web Soil Survey URL: http://websoilsurvey.nrcs.usda.gov Coordinate System: UTM Zone 18N NAD83 Please rely on the bar scale on each map sheet for accurate map measurements. Enlargement of maps beyond the scale of mapping can cause misunderstanding of the detail of mapping and accuracy of soil line placement. The maps do not show the small areas of contrasting soils that could have been shown at a more detailed scale. Warning: Soil Map may not be valid at this scale. The soil surveys that comprise your AOI were mapped at 1:12,000. Map Scale: 1:5,410 if printed on A size (8.5" * 11") sheet. Hydrologic Soil Group-,___>ex County, New Jersey

Hydrologic Soil Group-Essex County, New Jersey Hydrologic Soil Group Hydrologic Soil Group—Summary by Map Unit — Essex County, New Jersey (NJ013) Rating Map unit name Map unit symbol Acres in AOI Percent of AOI BogBc 8oonton loam, 0 to 8 percent slopes, extremely stony C 1.1 0.9% BogCc Boonton loam, 8 to 15 percent slopes, extremely stony C 6.3 5.3% DuuB Ounellen - Urban land, Dunellen substratum complex, 0 to 8 percent slopes A 11.7 9.8% HanBc Haledon silt loam, 0 to 8 percent slopes, extremely stony C 1.2 1.0% UdbonB Udorthents, Boonton substratum, 0 to 8 percent slopes D 26.0 21.8% URBONB Urban land, Boonton substratum, 0 to 8 percent slopes 40.0 33.5% USBONB Urban land, Boonton substratum Boonton complex, 0 to 8 percent slopes 32.9 27.6% YaobBc Yalesville - Boonton - Holyoke complex, B 0 to 8 percent slopes, extremely stony 0.0 0.0% 119.1 100.0% Totals for Area of Interest Natural Resources Conservation Service Web Soil Survey National Cooperative Soil Survey 10/10/2011 Page 3 of 4