J_2024 05 09_West Orange Stormwater Management Plan

For Inspector Component No. Component Name Inspection Item and Inspection Item No. For Maintenance Crew Result Preventative / Corrective Maintenance Actions Recheck to determine if there is standing water after 72 hours If standing water is present longer than 5 days, report to mosquito commission. Standing water is present after the design drain time 1 The observed drain time is approximately _________ hours. Y__ N__ Remove any sediment buildup Check the soil permeability Till the soil bed with rotary tiller or disc harrow Replace the planting soil, if necessary B Basin Bed Work Order # ______________ 2 3 Excessive sediment, silt, or trash accumulation on basin bed Erosion or channelization is present Y__ Clean pretreatment system N__ Remove silt, sediment, and trash Y__ N__ Check whether the flow bypass or diversion device is clogged Re-grade the infiltration bed Work Order # ______________ 4 Y__ Pest control N__ Work Order # __________ Bioretention System Page 39/49 Animal burrows/rodents are present Note: April 2015

For Inspector Component No. Component Name Inspection Item and Inspection Item No. For Maintenance Crew Result Y__ 5 Uneven bed N__ B Basin Bed 6 7 Evidence of sinkholes or subsidence Pop-up Drainage Emitters and perforated drainage pipes Use light equipment to resurface the bed Work Order # _________ Y__ Monitor for sinkhole development N__ Y__ N__ Y__ 1 Preventative / Corrective Maintenance Actions Large spot(s) showing bare soil N__ Open Pop-up drainage emitters and inspect for blockages, remove blockages if found Vegetative cover must be maintained at 85%. Revegetate the entire basin if 50% or more vegetation has been lost. Check Landscaping plan for guidance (if available) Work Order # __________ C Vegetation Y__ 2 Invasive plants are present N__ Remove the invasive plants and restore the vegetation in accordance with the landscaping plan Work Order # __________ Revegetate the system in accordance with the vegetation plan 3 The vegetation in the basin has been mowed or removed April 2015 Y__ N__ Bioretention System Work Order # __________ Note: The vegetation in a bioretention system should not be mowed or removed Page 40/49

For Inspector Component No. Component Name Inspection Item and Inspection Item No. For Maintenance Crew Result Preventative / Corrective Maintenance Actions Note: Check for excessive overland runoff flow through the embankment. 1 D Bioretention System Embankment and Side Slopes Signs of erosion, soil slide or bulges, seeps and wet spots, loss of vegetation, or erosion on the basin slope Check for any sink hole development Y__ N__ Direct the overland runoff to the forebay or pretreatment area Restabilize the bank Work Order # __________ Mow the vegetation on the perimeter of the embankment Y__ 2 Overgrown perimeter vegetation N__ 1 E Outlet Trash or debris accumulation more than 20% Work Order # __________ Note: Mowing of vegetation should only take place in the area outside the basin. Dense vegetation must be maintained in the basin. Clean and remove Y__ N__ Determine source of trash and address to reduce future maintenance costs or basin failure Y__ Repair or replace trash rack N__ Work Order #__________ Bioretention System Page 41/49 Trash rack is damaged or rusted greater than 50% 2 Trash rack is bent, loose, or missing parts April 2015

For Inspector Component No. Component Name Inspection Item and Inspection Item No. 3 4 Outlet components (e.g., orifice plates or weir plate) skewed, misaligned, or missing Discharge pipe apron is eroded or scoured For Maintenance Crew Result Preventative / Corrective Maintenance Actions Y__ Repair or replace component N__ Work Order #__________ Y__ Restabilize the discharge riprap apron N__ Work Order #__________ Y__ Remove trees and roots, and restore berms if necessary Note: 1 Trees or excessive vegetation present F Emergency Spillway 2 1 G Miscellaneous 2 3 N__ Work Order #________ Y__ Repair N__ Work Order #________ Y__ Repair or replace N__ Work Order #__________ Y__ Repair or replace N__ Work Order #__________ Y__ Repair or replace N__ Work Order #__________ Bioretention System Page 42/49 Damaged structure Fence: broken or eroded parts Gate: missing gate or lock Sign/plate: tiled, missing, or faded April 2015

For Inspector Component No. Component Name Inspection Item and Inspection Item No. 4 Excessive or overgrown vegetation blocking access to the basin For Maintenance Crew Result Y__ N__ Preventative / Corrective Maintenance Actions Clear, trim, or prune the vegetation to allow access for inspection and maintenance Work Order #________ Note: Follow Up Items (Component No. / Inspection Item No.): Associated Work Orders: # ______, # ______, # ______, # ______, # _____ ________________________ Inspector Name ______________________ ________________ Signature Date Report issues to the local authority and mosquito commission as required by local ordinances and regulatory authorities. File this checklist in the Maintenance Log after performing maintenance. April 2015 Bioretention System Page 43/49

Preventative Maintenance Record Corresponding Checklist No. ________ Component No._______, Inspection Item No.________ Work Logs Activities Sediment/debris removal Sediment removal should be taken place when the basin is thoroughly dry. Vegetation removal Components A1/A2/A3 – Pretreatment B – Basin Bed D – Bioretention System Embankment and Side Slopes E – Outlet Date Completed A1/A2/A3 – Pretreatment B – Basin Bed D – Basin Embankment and Side Slopes E – Outlet F – Emergency Spillway Vegetation is removed by _____________ (type of equipment) with minimum disruption to the remaining vegetation. All use of fertilizers, pesticides, mechanical treatments, and other means to ensure optimum vegetation health must not compromise the intended purpose of the stormwater management measure. The fertilizer applied is ____________ (type), and _________ (quantity per usage) is applied _____________ (frequency of use). Debris, sediment, and trash are handled (onsite / by ____________ (contractor name) to disposal site _________________). (See Part I: Maintenance Plan – Disposal Plan Section) Crew member:___________________/_________________ Date: _____________ (name/ signature) Supervisor:_____________________/__________________ Date: _____________ (name/ signature) File this Preventative Maintenance Record in the Maintenance Log after performing maintenance. April 2015 Bioretention System Page 44/49

Corrective Maintenance Record 1. Work Order # ______________________ Date Issued _____________ 2. Issue to be resolved: 3. The issue was from Corresponding Checklist ________, Component No. ______, Inspection Item No. _____ . 4. Required Actions Actions Install new bolts to fix the orifice plate Repair/replace the trash rack Restabilize side slope (indicate location) Repair riprap apron with 100 cubic yards of aggregate Revegetate Planned Date Date Completed 5. Responsible person(s): _____________________________________________________________ 6. Special requirements o Time of the season or weather condition :__________________________ o Tools/equipment:_____________________________________________ o Subcontractor (name or specific type):_____________________________ Approved by ___________________/_______________ Date _____________ (name/signature) Verification of completion by ____________/________ Date _____________ (name/signature) File this Corrective Maintenance Record in the Maintenance Log after performing maintenance. April 2015 Bioretention System Page 45/49

APPENDIX E - SUBSURFACE INVESTIGATION

January 17, 2023 File No. 26.0092704.00 PSE&G 80 Park Plaza, T-13 P.O. Box 570 Newark, New Jersey 07101 Attention: Mr. Matthew Cieri Civil Project Engineer Report Addendum Supplemental Test Pits and Permeability Testing West Orange Switching Station Lifecycle Project West Orange, Essex County, New Jersey PSE&G Introduction This report addendum presents the results of five additional test pits and related permeability testing performed for the West Orange Switching Station Lifecycle Project at the West Orange Switching Station located at 341 Mount Pleasant Avenue in West Orange, Essex County, New Jersey. The subject site is identified as Block 155, Lot 26.01 on the local tax map. Background Information GZA previously performed a subsurface investigation for the proposed Lifecycle project, the results of which was presented in our report dated August 8, 2022. Following completion of the investigation, five additional stormwater test pits were requested along the eastern edge of the site and are the subject of this addendum. Discussion On January 4th through January 6th, 2023, our representative visited the site and observed the excavation of the five requested additional test pits which have been identified as TP-201 through TP-205. The test pits were excavated by PSE&G’s contractor (Furino & Sons) and extended to depths of approximately 6 feet to 10 feet beneath the existing surface levels (bgs). The approximate test pit locations are shown along with the prior explorations on the Plot Plan, Plate 1. Detailed descriptions of the encountered subsurface conditions are presented on the Logs of Test Pits, Plates 2A through 2E. Test Pit 201 encountered 4-inches of gravel at the ground surface, while the other four test pits encountered 1 to 4 inches of topsoil at the ground surface. Silty and sandy clay loam or loam fill materials were encountered in Test Pits 201, 204, and 205. The fill was An Equal Opportunity Employer M/F/V/H

January 17, 2023 File No. 26.0092704.00 PSE&G – West Orange Station Page 2 underlain by buried topsoil in Test Pits 204 and 205. The fill and buried topsoil extended to depths of approximately 2 to 4.5-feet bgs. Proactive by Design Native soils consisting primarily of silts and clays with occasional silty sand layers were encountered below the fill and surface materials and extended to the underlying basalt bedrock in Test Pit 201 to Test Pit 205 at which point refusal to further excavation was encountered. The native soils in Test Pit 205 extended to the maximum reach of the excavator, 10 feet bgs. Groundwater seepage was observed in Test Pit 201 and 204 at depths of 6 feet and 7 feet respectively, atop of or within 1 foot of the underlying bedrock. Groundwater levels will vary based on seasonal changes. Permeability Test Results Field single ring infiltration tests were initiated at approximately 3.5 to 4 feet bgs in the test pits. In addition, tube samples were collected from each test pit for laboratory tube permeameter permeability testing. The results of the field single ring infiltration and laboratory tube permeameter tests are presented in the table below and are shown on the appropriate exploration logs. The infiltration test rates from the single ring tests were used to calculate a permeability rate using the formula provided in Chapter 12 of the NJDEP BMP manual. Summary of Permeability Test Results Test Permeability Type of Test Depth USDA Description of Soil Tested (in/hr.) (1) Performed (ft, bgs) TP-201 1.5 <0.06 Loam Fill Tube Permeameter TP-201 6 >20 Loamy Sand Tube Permeameter TP-202 1.5 0.2 Sandy Clay Loam Tube Permeameter TP-202 4 <0.06 Clay Loam Tube Permeameter TP-202 4 <0.06 Clay Loam Single Ring TP-203 2 0.2 Silt Loam Tube Permeameter TP-203 4 <0.06 Silty Clay Loam Single Ring TP-203 5 0.1 Clay Tube Permeameter TP-204 4 <0.06 Silt Loam Single Ring TP-204 4 <0.06 Silt Loam Tube Permeameter TP-204 6 <0.06 Clay Loam Tube Permeameter TP-204 8 <0.06 Clay Loam Tube Permeameter TP-205 3.7 <0.06 Silt Loam Topsoil/Fill Single Ring TP-205 4 <0.06 Silt Loam Topsoil/Fill Tube Permeameter TP-205 5 <0.06 Loam Single Ring TP-205 7 <0.06 Clay Loam Tube Permeameter (1) Slowest of two test replicates reported for laboratory tube permeameter tests. Exploration No. An Equal Opportunity Employer M/F/V/H