EROSION AND SEDIMENT POLLUTION CONTROL REPORT

FOR

CENTERPOINT COMMERCE & TRADE PARK SOUTH

RIVER ROAD (S.R. 2004) & SAYLOR AVENUE (S.R. 2015)

IN

JENKINS TOWNSHIP

LUZERNE COUNTY, PENNSYLVANIA

PREPARED FOR

MERICLE RIVER ROAD, LLC

PREPARED BY

MERICLE COMMERCIAL REAL ESTATE SERVICES

PROJECT #: 2366

DATE: December 8, 2021

REVISED DATE: February 17, 2022

REVISED DATE: April 28, 2022

REVISED DATE: July 6, 2022

REVISED DATE: September 30, 2022

REVISED DATE: July 19, 2023

REVISED DATE: May 31, 2024

REVISED DATE: January 23, 2026

100 BALTIMORE DRIVE, EAST MOUNTAIN CORPORATE CENTER, WILKES-BARRE, PA, 18702

TELEPHONE (570) 823-1100 FAX (570) 823-3524

TABLE OF CONTENTS

Project Narrative Existing Topographic Features Types, Depth, Slope, Location and Limitation of Soils Characteristics of Earth Disturbance Volume and Rate of Runoff from the site Location of Surface Waters which may Receive Runoff Description of E&S BMPs

Temporary Control Measures Permanent Control Measures Collection, Conveyance and Energy Dissipation Seeding

Sequence of BMP Installation and Removal Critical Stages of PCSM BMP Installation Operation and Maintenance of E&S BMPs Recycling and Disposal of Materials Naturally Occurring Geologic Formations or Soil conditions Thermal Impacts Regulatory Concurrence Identification of Existing and Proposed Riparian Forest Buffers

APPENDIX A

Location Map Soils Map Rainfall Information

APPENDIX B

Standard E&S Worksheets Conveyance Calculations

PROJECT NARRATIVE

This submission is a minor modification to the existing NPDES Permit Number PAC400140A-2.

It is being submitted in relation to a revision to the site improvements at CenterPoint Commerce & Trade Park South in Jenkins Township, Luzerne County, PA. The original issued NPDES Permit Number was PAG-02-004010008, approved September 13, 2010.

Construction of buildings, truck court yards, and parking lots on Lots #2, #3, and #4 have been completed and are in a stabilized condition. All previously approved Sediment Basins to be converted to permanent Infiltration Basins have been constructed and are stabilized and functional.

Mericle River Road, LLC has since acquired additional and adjacent to the site. The modifications to the previous E&S Plan Approval consists of the following plan revisions:

1. A Rail Road Spur is proposed to be constructed to provide service to Lot #2 and Lot #4.

2. A Rain Garden (RG-12) is proposed downslope of the Rail Road Spur. The Rain Garden will be utilized as a Sediment Trap (ST-E) during construction.

3. The Limit of Disturbance will be increased by 1.60 acres to accommodate the Rail Road

Spur and Rain Garden. All runoff will be conveyed to Discharge Point #2

Mericle River Road, LLC; 159 Commonwealth Drive, LLC; and 144 Commonwealth Drive-, LLC proposes to construct the rail spur and raingarden in an existing industrial park located on a 138-acre parcel in Jenkins Township, Luzerne County, PA. Maintenance of the improvements will be the responsibility of the contractor during construction. Upon completion of the improvements, maintenance will be the responsibility of the property owner.

The site drains to three (3) unnamed tributaries to the Susquehanna River. The project area is located within the watershed of the Susquehanna River which is classified by PA Chapter 93 as warm water fishes (WWF) and migratory fish (MF).

The project area will be part of a planned industrial site called Centerpoint Commerce & Trade Park South. Stormwater management facilities have been designed to accommodate the roadway and individual lot developments within the park. The project site is not located within an Act 167 Stormwater Plan area. The stormwater management plan, as designed, meets or exceeds the requirements of the Jenkins Township SALDO which requires post development runoff rates to be managed to not exceed the predevelopment runoff rates for runoff occurring between the 1 year and 100-year storm events. A Wetland Absence Memorandum is provided for the additional disturbed area.

The site has been reviewed for wetlands by Joseph Gallagher of Ecological Solutions, Inc., Conyngham, PA. Three (3) pockets of wetlands have been identified on the CenterPoint South site totaling 1.43 acres. Wetland locations are shown on the plans. There are no planned disturbances of any wetland areas.

The total area of disturbance will now be approximately 141 acres an increase of approximately

1.60 acres from the prior approval. The proposed NPDES Boundary is approximately 145 acres.

The construction of this project began in August 2022 and will be completed by December 2027.

The project location is shown on the location in Appendix A.

The permanent stormwater management will include eight (8) infiltration basins which have been constructed and a network of collection and conveyance facilities to maintain the existing drainage patterns. Four (4) of the proposed infiltration basins are currently utilized as sediment basins during to reduce the risk of sediment laden runoff leaving the site. A Rain Garden (RG-

12) is proposed downslope of the Rail Road Spur. The Rain Garden will be utilized as a Sediment Trap (ST-E) during construction.

Infiltration Basin 7, which has been constructed, has been designed to manage peak runoff and volume from a previously developed upland (offsite) residential area as part of the Wyoming Valley Sanitary Authority’s MS4 Program. Currently, the runoff from the approximate 150 offsite acres flows through a wetland and flows into a strip-mining depression or pond located on the development site.

Earth disturbance for this project will consist mainly of bulk earth moving activities needed to bring the proposed building pad, trailer storage areas and parking areas to grade. The deepest cuts will be proposed in the mild slope area along easterly property boundaries. Rock and earthen fill generated from the onsite borrow areas will be used for fill operations and will also be processed to make the necessary sized aggregate. Fill slopes are generally proposed at 2:1 across the site. The building foundation(s) will be dug once the pad subgrade elevations are achieved and storm sewer pipes will be installed as fill operations are progressed.

Maintenance of the improvements will be the responsibility of the contractor during construction. Upon completion of the improvements, maintenance will be the responsibility of the property owner.

The past land use (50 years and later) for this site was coal mining. The No. 14 coalmine of the Pennsylvania Coal Company was mined on the property which included several buildings to support the mining work. The property was reclaimed in the 1990’s by Northampton Fuel Supply Company. In August 2003, a Phase 1 Environmental Site Assessment was completed which indicated the property was primarily undeveloped, reclaimed coalmine land and forested land, which is consistent with its current use. The reclaimed coal land area comprises 75% of the property. The proposed site use is commercial/industrial.

EXISTING TOPOGRAPHIC FEATURES

Approximately 75% of the site is currently cleared in a meadow condition. Slopes in the cleared meadow area range from 2 % to 20%. The remaining portion of the site, toward the perimeter portions of the tract is wooded with embankment slopes of approximately 3:1.

The 138-acre site is tributary to the Susquehanna River watershed and drains to existing drainage structures located under River Road and Saylor Avenue adjacent to the project site westerly side of the site. The project area contains a mixture of forested areas, open grassed areas and areas where localized depressions occur from previous strip-mining activities.

Wetland locations, steep slopes and the FEMA Flood Plain are shown on the Existing Features/ Sensitive Resources Plan. Steep slopes are identified on the existing conditions sensitive feature plan and are depicted in the following ranges: 15-25% and >25%.

TYPES, DEPTH, SLOPE, LOCATION AND LIMITATION OF SOILS

At - Atherton silt loam, slopes vary BrB - Braceville gravely loam, 3 to 8 percent slopes BrC - Braceville gravely loam, 8 to 15 percent slopes ChA - Chenango gravely loam, 0 to 3 percent slopes ChB - Chenango gravely loam, 3 to 8 percent slopes ChC - Chenango gravely loam, 8 to 15 percent slopes DdB - Dekalb channery sandy loam, 0 to 8 percent slopes, rubbly Mg - Mine Dump, slopes vary OlD - Oquaga and Lordstown channery silt loams, 15 to 25 percent slopes OXF - Oquaga and Lordstown stony silt loams, steep slopes Ps - Pope soils RdB - Rexford loam, 3 to 8 percent slopes Sm - Strip mine WrB - Wurtsboro channery loam, 3 to 8 percent slopes WrB - Wurtsboro channery loam, 8 to 15 percent slopes

Soil mapping in the project area is shown in Appendix A.

Soils found in the project area are characterized as well drained, silty-gravelly loams, sand and gravel, and tend to exhibit fair quality for construction uses required for this project. However, the lower elevations of the site contain a shallow fragipan underlain by stratified sands and gravels. Select portions of the site contain pockets of glacial outwash deposits containing extremely gravelly, coarse sands.

Soil Limitations The primary soil limitation for the reclaimed strip mine site is loose unconsolidated fills which may likely require subgrade modification with structural fill to support shallow building foundations. However, the southeast side of the site is generally considered suitable for development and support of conventional spread footings with only minor siting considerations related to subsurface conditions.

Soils located at the project site were evaluated for use based on the Soil Survey of Luzerne County, Pennsylvania. Use limitations were based on criteria established in Tables 5, 6 and 8 of the Soil Survey and are shown in Table 1 – Soil Use Limitations

Table 5 Use Resolution Septic tank absorption area Provide connection to public sewer Sewage lagoons Not applicable to this project Dwellings with basements Not applicable to this project Lawns and landscaping Import topsoil as necessary Local road and streets Import select granular subbase as necessary Sanitary landfill Not applicable to this project

Table 6 Use Camp areas Not applicable to this project Service buildings and dwellings Provide select granular subbase as necessary without basements Paths and trails Not applicable to this project Picnic areas Not applicable to this project Table 8 Use Topsoil Import topsoil from offsite as applicable Sand and Gravel Not applicable to this project Road fill Compact in 8” lifts Highway and road location Contractor to use appropriate equipment for site conditions Reservoir area No applicable to this project Embankment Cut slopes at 3:1 where possible Drainage Construct on-site drainage to roadway system Sprinkler irrigation Not applicable to this project Terraces and diversions Not applicable to this project Grassed waterways Provide synthetic swale liners where necessary Winter grading Provide bituminous surface roads Pipeline construction and maintenance Blasting may be required

Soils found in the project tend to exhibit fair to poor quality for construction uses required for this project. These types of soils are typically found in northeast Pennsylvania and are used for construction in varying degrees throughout the area. These types of sites have been successfully developed into industrial uses throughout Luzerne County. The contractor shall utilize construction practices generally used in northeast Pennsylvania.

Hydrologic Soil Groups Extensive test pit and drilling investigations have been completed on the 138-acre tract. The soils in the project area primarily consist of the strip mine classification consisting of an 8” to 12” topsoil cover; varying layer depths of breaker rock; underlain by 4’ to 15’ of sand and gravel.

The hydrologic soils groups are described below:

Soil Hydrologic Soil Group

Hydric Components

At B/D Yes BrB C Yes (5%) BrC C Yes (5%) ChA A No ChB A No ChC A No DdB A No Mg N/A No OlD C No OXF C No

Ps B Yes (5%) RdB D Yes Sm N/A No

CHARACTERISTICS OF EARTH DISTURBANCE

Earth disturbance for this project will consist mainly of bulk earth moving activities needed to bring the proposed building pads, trailer storage areas and parking areas to grade. The deepest cuts will be proposed along the easterly property boundaries. Earthen fill generated from the onsite borrow areas will be used for fill operations. If rock is encountered in the deep cut areas it will be processed to make the necessary sized aggregate. Fill slopes are generally proposed at 2:1 across the site. The embankment berms for the sediment/infiltration basins are 3:1 fill slopes.

Four of the eleven proposed stormwater management BMP will be utilized as sediment basins/traps during construction. Temporary swales and diversion berms are proposed to direct runoff from the disturbed cut slope areas into the sediment basins/traps, as well as, intercept runoff from impacting the deeper fill slope areas of construction.

The E&S plan minimizes the extent of earth disturbance by utilizing 2:1 cut/fill slopes and a gravity retaining wall. It also minimizes the duration of disturbance by providing specifications for temporary and permanent stabilization.

The E&S plan maximizes the protection of existing drainage features and vegetation by utilizing 2:1 cut/fill slopes, helping to ensure slope stabilization via slope tracking and reducing the volume of runoff through infiltration basin construction.

The E&S plan minimizes soil compaction by ensuring only the building/pavement/concrete areas are compacted during construction. Slope and basin areas shall be tracked, but not compacted, unless directed by a geotechnical engineer for stability.

The E&S plan utilizes other measures or controls that prevent or minimize generation of increased stormwater runoff via reducing the volume of runoff through infiltration basin construction.

VOLUME AND RATE OF RUNOFF FROM THE SITE

The Stormwater Management Plan was designed in accordance with the Jenkins Township Subdivision and Land Development Ordinance, 1991 and the Jenkins Township Stormwater Management Ordinance, 2012.

The project has been designed to meet the applicable stormwater management requirements for rate control. The NPDES permit, municipal stormwater management regulations require the peak rate of runoff leaving the site in the post development condition be reduced to the predevelopment conditions for the 1-yr though 100-yr, 24-hr storm events.

The project has been designed to meet the applicable volume control requirements for the 2-year, 24-hr design storm. The NPDES permit regulations require the increase in runoff volume generated by the 2-yr 24-hr storm event to be reduced to the existing conditions. Volume requirements and credits will be broken out by point of interest, and completed using the standard PADEP Worksheets, latest version. The volume credits taken include the volume stored below the lowest orifice of the outlet structure, evapotranspiration as well as the volume stored in the media in the bottom of the BMPs.

Volume calculations were performed to calculate the volume reaching each BMP, and were used to populate the DEP volume spreadsheets. The volume of runoff discharging from each BMP was added to the downstream BMP using the “BMP in Series Volume Calculations and Volume Credit Summary” provided in the PCSM Report.

Soil test pits and infiltration testing for the proposed BMPs was completed by Midlantic Engineering, Inc. The Infiltration Testing Reports dated June 10, 2022, December 2, 2021, June 7, 2010, February 12, 2010, and Test Pit Observation Logs dated June 10, 2022, along with the Overall Test Pit Plan dated June 27, 2022 are provided in Appendix E of the PCSM Report.

Infiltration testing has yielded numerous results of 10”- 20” per hour. The geotechnical engineer recommends over excavation of the basin and raingarden subgrades and the placement of a minimum 2-foot engineered soil buffer layer consisting of topsoil, sand, and compost to reduce the rate of infiltration and increase the dewatering time.

LOCATION OF SURFACE WATERS WHICH MAY RECEIVE RUNOFF

There are three (3) surface waters receiving onsite disturbed area runoff from the site. The PADEP PCSM Spreadsheets only consider runoff from the disturbed on-site areas. Those surface waters include runoff to the following four (4) Discharge Points:

1. Susquehanna River via two (2) existing culverts under River Road (DP-1 & DP-2)

2. Wetland B & C located in the northwest corner of the site (DP-3)

3. Wetland D along the southern site boundary abutting Susquehanna Estates (DP-4)

Discharge Point 1 (DP-1) in the southwest corner of the site runoff discharges into an 18” reinforced concrete pipe which flows under Saylor Avenue and then discharges into an existing 6’ x 8’ concrete arch culvert under River Road and ultimately flows to the Susquehanna River via an existing channel.

DP-2 runoff discharges from the site into an existing 36” smooth lined polyethylene pipe near the baseball field and Jennings Street. The flow from the 36” pipe is conveyed via an existing culvert under River Road and also flows into the Susquehanna River via an existing channel.

The existing drainage patterns, and discharge points, will be generally maintained for the proposed site development. Erosion and Sediment Pollution controls have been designed, and will be installed, to protect the receiving watercourses from sediment laden runoff during construction on the site. A combination of structural and non-structural Post Construction Stormwater BMPs will protect the integrity of the receiving watercourses after construction.

DESCRIPTION OF E&S BMPS

TEMPORARY CONTROL MEASURES

1. Rock construction entrance: Install rock construction entrance prior to earthmoving work and in accordance with the plan. If grading is necessary to construct entrance, ensure silt socks are installed downslope of the rock construction entrance. Rock construction entrances shall be maintained during construction and until the site is stabilized or the entrance is removed to facilitate paving operations.

2. Silt sock: Install silt socks in accordance with the plan and at locations directed by the engineer. Silt socks shall be installed prior to the work, during construction and until completion. The silt socks are not designed to be placed in areas of concentrated flow.

Maintenance is the responsibility of the operator. Sediment shall be removed when it reaches ½ the height of the silt socks. Silt socks shall be inspected weekly and after each runoff event. The silt socks shall be repaired or replaced immediately after any damage occurs.

3. Sediment Basins: Install dewatering facility, clean out stake, baffles and rock landing berm as indicated on the approved drawings. The permanent outlet structure may need to be modified to accommodate the skimmers. Deposited sediment must be removed the basin bottom once the clean out elevation is reached.

4. Rock filter outlet: Install temporary rock filter outlet in locations shown on the plans.

Rock filter outlets shall be constructed immediately upon discovering overtopped or undermined filter fabric fence. Sediment must be removed when accumulations reach 1/3 the height of the outlet. The contractor shall maintain a supply of coarse aggregate on site for the replacement of temporary rock filter outlets should they become clogged with sediment or debris.

5. Filter bag inlet protection: Install filter inlet bags in existing inlets prior to earth disturbances within the drainage area tributary to the inlet and immediately after inlets are constructed. Inlet protection is to be maintained until the area contributing sediment to it is stabilized.

6. Temporary seeding: Temporary seeding shall be applied to areas disturbed by grading operations, where final grading and stabilization is not expected to be immediately completed. Immediately following initial disturbance or rough grading, all critical areas subject to erosion (steep slopes and roadway embankments) shall receive temporary seeding in combination with straw mulch or suitable equivalent at a rate of 3 tons per acre. Where cessation of earth disturbance activities will exceed 4 days, the site shall be immediately seeded, mulched, or otherwise protected from accelerated erosion and sedimentation pending future earth disturbance activities. During non-germinating periods, mulch must be applied at the recommended rates.

7. Temporary slope lining: All slopes greater than 3:1 shall be lined with an erosion control mat. Erosion control matting shall be installed in accordance with the manufacture's recommendations and as shown on the drawings.

8. Pumped water filter bags: Filter bags should be installed according to the details on the plans. Pump utility trench water into filter bags prior to discharging to the waters of the commonwealth. Filter bags may also be used to dewater sediment traps or basins. Compost Filter Sock must be installed around pumped water filter bags, unless a sump pit is installed.

PERMANENT CONTROL MEASURES

1. Rock Apron: Install rock aprons at the outlets of pipes as shown on the plans. Rock aprons shall be installed immediately after drainage pipe and/or end section or endwall is constructed.

2. Stilling basins: Construct stilling basins at the termination of outlet pipes as shown on the plans. Stilling basins shall be constructed immediately after drainage pipe and/or end section or endwall is constructed.

3. Emergency Spillways: Rock lined emergency spillways are provided at each of the stormwater basins and are designed for the 100-year storm event.

4. Permanent Swale Lining: Permanent swale linings shall be installed immediately after constructing swale channel. Install permanent swale lining in accordance with the manufacturer’s recommendations and as shown on the plans.

5. Permanent Seeding: Permanent seeding shall be applied to disturbed areas immediately after final grading is completed. Permanent seeding and mulch shall be completed in accordance with the rates and mixtures found on the drawings and herein.

6. Rock Check Dams: Upon achieving a minimum uniform 70% perennial vegetative cover or other permanent non-vegetative cover with a density sufficient to resist accelerated surface erosion and subsurface characteristics sufficient to resist sliding and other movements for the Construction Drainage Area directed to swales, install rock check dams in accordance with plan and construction details.

7. Infiltration Basin Forebays: Upon achieving a minimum uniform 70% perennial vegetative cover or other permanent non-vegetative cover with a density sufficient to resist accelerated surface erosion and subsurface characteristics sufficient to resist sliding and other movements for the Construction Drainage Area directed to the basin, install earthen forebays in accordance with plan and construction details.

8. Stormsack Inlet Filters: Stormsack Inlet Filters shall be installed in accordance with the plans and construction details.

COLLECTION, CONVEYANCE AND ENERGY DISSIPATION

The collection and conveyance systems for this project include vegetated swales, roof drains and storm sewer pipe networks. At a minimum, all collection and conveyance facilities have been designed for the 25-yr design storm based on the tributary drainage areas reaching each. The drainage systems conveying the discharge from one routed BMP to another routed BMP (i.e., Basins 7, 8, and 10 are routed into Basin 2 and then Basin 1) have been designed for the 100-year storm to ensure the functionality of the proposed BMPs.

A time of concentration was calculated for some of the larger drainage areas using TR-55. If a TC calculation is not provided, the following assumptions were used:

TC = 5 minutes for Rational Method Calculations TC = 6 minutes for SCS Method Calculations

Rainfall Intensities and depths for this site were taken from NOAA Atlas 14, Volume 2, Version 3 and are included in this report.

Stilling Basins and/or Rock Aprons are proposed at outfall locations. The energy dissipaters were sized using the 25 year or 100-year design flows, as described above. Flow Master was used to estimate the velocity at each discharge point and the rock sizes were selected using the allowable velocities listed in the E&S Manual.

SEEDING

1. Seeding Specifications

A. General – Spread seeds where indicated and at the rates specified in Table A or as otherwise indicated. Spread seeds within the following dates or as otherwise indicated or directed.

Formula B, D, and L - March 15 to June 1

August 1 to October 15

Formula C Ryegrass portion - March 1 to October 15 Crownvetch portion - Anytime except September and October

Formula E - March 15 to October 15

Formula W - April 1 to June 15

August 15 to September 15

ERNMX - 126 - March 15 to June 1

ERNMX - 180 - March 15 to June 1

Where project conditions warrant, seeding dates may be extended. If extended, either apply full treatment or apply only 50% of the permanent seeding and soil supplements and apply remaining 50% within the next seeding dates as directed in writing by the engineer.

On topsoiled areas, where temporary seeding and mulching has been applied, use tillage and soil supplements prior to permanent seeding.

On un-topsoiled areas, where temporary seeding and mulching has been applied, permanent seed and soil supplements may be applied without tilling.

B. Tillage – on topsoiled areas, 3:1 and flatter, thoroughly loosen the surface to a depth of at least 2 inches, by disking, by harrowing, or by other acceptable methods until the tillage is satisfactory. On un-topsoiled areas, 3:1 or flatter, till only as directed. Also, till or scarify areas when the surface is glazed or crusted.

Correct surface irregularities by filling any depressions and leveling rough or uneven areas. Remove all metal objects, stones larger than 2 inches in any dimension and other debris or other objects deemed to be detrimental to maintenance operations.

C. Soil Supplements – Uniformly apply supplements to the areas to be seeded. Properly document bulk delivery, as specified in the tables included herein.

On topsoiled areas, blend the initial soil supplements into the soil at least 2 inches by raking, disking, harrowing, or by other acceptable methods. The blending of the supplements into the soil may be performed during tillage operations.

Prior to project completion, apply slow-release nitrogen fertilizer to the surface of Formula B, D, L, and W seed areas.

D. Maintenance – Satisfactorily maintain grass and legume areas within grading limits, until the entire project has been completed. Mow as indicated and when directed.

Control prohibited and noxious weed growth within the right-of-way by herbicide spraying sand cutting. These plants are defined by law.

After seeding and supplement work on slopes has been satisfactorily completed, if a slope failure occurs, which requires redressing, excavation, or establishment of a new slope, reapply soil supplements and reseed as specified for the original treatment.

2. Mulching

A. Mulching seeded areas. Place mulch of the kind indicated, immediately after seeding is completed. Place only straw or wood cellulose over topsoiled areas. Use hay, straw, or wood cellulose in other areas as directed.

Place hay or straw uniformly, in a continuous blanket, at a minimum rate as indicated on the table included herein, or as otherwise directed. If directed, increase the rate of application, depending on the material used, season, soil conditions or method of application. An acceptable mechanical blower may be used to apply mulch.

Machines which cut mulch into short pieces will not be permitted. Anchor mulch with specified mulch binders applied at the following rates.

Recycled cellulose fiber: 160 pounds per 1,000 square yards Wood Fiber: 160 pounds per 1,000 square yards Non-asphaltic emulsion: At manufacturer’s recommended rate Polyvinyl acetate: At manufacturer’s recommended rate Recycled cellulose/wood: 160 pounds per 1,000 square yards

Apply wood fiber mulch hydraulically in accordance with the manufacturer’s tank mixing instructions. It may be incorporated as an integral part of the slurry after the seed and soil supplements have been thoroughly mixed. Apply uniformly at a rate of 320 pounds per 1,000 square yards, unless otherwise indicated. Mulch temporary seeded areas with hay.

On slopes steeper than 3:1, after mulching, install erosion control blankets in accordance with the manufacturer’s installation guidelines.

B. Maintenance – Properly maintain mulched areas until the entire project has been completed. Promptly re-apply mulch materials which become dislodged or lost due to wind, rain, fire or other causes, at initial or modified rates as directed.

After mulching work on a slope has been satisfactorily completed, if a slope failure occurs, which requires redressing, excavation, or the establishment of a new slope, replace the mulch as directed.

TABLE 11.2

Soil Amendment Application Rate Equivalents

Permanent Seeding Rate Soil Amendment Per Acre Per 1,000 SF Per 1,000 SY Notes Agricultural Lime 6 Tons 240 lb 2,480 lb Or as per soil test

10-20-20 Fertilizer 1,000 lb 25 lb 210 lb Or as per soil test Temporary Seeding Rate Agricultural Lime 1 Ton 40 lb 410 lb No topsoil stockpiles 10-20-20 Fertilizer 500 lb 12.5 lb 100 lb No topsoil stockpiles

Table 11.4 – Temporary Seeding Recommended Seed Mixtures

Mixture Number Species Seeding Rate – Pure Live Seed (1)*

Most Sites Adverse Sites

2 (3)* Tall Fescue 60 75

Birdsfoot Trefoil, Plus Tall Fescue

6 10

(1)* PLS is the product of the percentage of pure seed times percentage germination divided by

100. For example, to secure the actual planting rate for switchgrass, divide 12 pounds PLS shown on the seed tag. Thus, if the PLS content of a given seed lot is 35%, divide 12 PLS by

0.35 to obtain 34.3 pounds of seed required to plant one acre. All mixtures in this table are shown in terms of PLS.

(3)* This mixture is suitable for frequent mowing. Do not cut shorter than 4 inches.

TABLE A

Seeding Requirements

Formula and Species % By

Weight Minimum %

Max % Weed Seed

Seeding Rate lb/1000 yd2

Purity Germination Formula B Mix Perennial Ryegrass mixture (Lolium perennial). A combination of improved certified varieties with No one variety exceeding 50% of the total Ryegrass component.

0.10

42.0 Total

8.5

Creeping Red Fescue or Chewings Fescue (Festuca rubra or ssp commutate) (Improved and Certified)

30 97 85 0.10 12.5

Kentucky Bluegrass mixture (Poa pratensis). A combination of improved certified varieties with no one variety exceeding 50% of the total Bluegrass component.

50 97 80 0.15 21.0

Formula C Conservation Mix Crownvetch (Coronilla varia)

70*

12.0 Total

5.5

Annual Ryegrass (Lolium multiflorum) 55 95 90 0.10 6.5 Formula D Conservation Mix Tall Fescue (Festuca arundinacea var.

Kentucky 31)

50.0 Total

30.0

Creeping Red Fescue or Chewings Fescue (Festuca rubra or ssp commutate) (Improved and Certified)

30 97 85 0.10 15.0

Annual Ryegrass (Lolium multiflorum) 10 95 90 0.10 5.0 Formula E Annual Ryegrass (Lolium multiflorum)

10.0 Total

10.0

Formula L Mix Hard Fescue mixture (Festuca longifolia). A combination of improved certified varieties with no one variety exceeding 50% of the total Hard Fescue component

48.0 Total

26.4

Creeping Red Fescue (Festuca rubra) (Improved and Certified)

35 97 85 0.10 16.8

Annual Ryegrass (Lolium multiflorum) 10 95 90 0.10 4.8

Formula N Conservation Mix Hard Fescue mixture (Festuca longifolia). A combination of improved certified varieties with no one variety exceeding 50% of the total Hard Fescue component

Creeping Red Fescue (Festuca rubra) (Improved and Certified)

Little Bluestem (Andropogon scoparius) Canada Wild Rye (Elymus canadeis) Virginia Wild Rye (Elymus virginicus) Indiangrass (Sorghastrum nutans) Annual Ryegrass (Lolium multiflorum)

0.20

30.0 Total

9.0

9.0

1.2

1.8

1.2

Black Eyed Susan (Rudbeckia hirta) New England Aster (Symphyotrichum novae-anglie) Ox-eye Sunflower (Heliopsis helianthoides)

0.9

3.0

1.5 0.9

1.5

Formula W Wetland Conservation Mix Tall Fescue (Festuca arundinacea var.

Kentucky 31)

15.0 Total

4.5

Birdsfoot Trefoil (Lotus corniculatus). 10 92 80* 0.10 1.5 Redtop (Agrostis alba) 10 92 80 0.20 1.5 Virginia Wild Rye (Elymus virginicus) 24 85 70 0.20 3.6 Tioga Deertongue (Panicum clandestinum) 14 95 80 0.20 2.1

Fox Sedge (Carex vulpinoides) 12 85 60 0.20 1.8

ERNMX – 180 Raingarden Seed Mix Little Bluestem (Schizachyrium

Scoparium)

33.4 30.0 Total

10.02 Virginia Wildrye (Elymus Virginicus)

20.0 6.0

Fox Sedge (Carex Vulpinoidea)

7 2.10

River Oats (Chasmanthium Latifolium)

5.6 1.68

Purple Coneflower (Echinacea Purpurea)

5.5 1.65

Partridge Pea (Chamaecrista Fasciculata) 3.0 0.90 Lanceleaf Coreopsis (Coreopsis

Lanceolata)

3.0 0.90

Deertongue (Panicum Clandestinum) 3.0 0.90 Redtop Panicgrass (Panicum Rigidulum) 3.0 0.90 Blackeyed Susan (Rudbeckia Hirta) 3.0 0.90 Blue Vervain (Verbena Hastata) 3.0 0.90 Oxeye Sunflower (Heliopsis

Helianthoides)

2.0 0.60

Swamp Milkweed (Asclepias Incarnata) 1.8 0.54 Blunt Broom Sedge (Carex Scoparia) 1.0 0.30 Wild Senna (Senna Hebecarpa) 1.0 0.30 New England Aster (Aster Novae-

Angliae)

0.5 0.15

Zigzag Aster (Aster Prenanthoides) 0.5 0.15 Blue False Indigo (Baptisia Australis) 0.5 0.15 Narrowleaf Mountainmint

(Pycnanthemum Tenuifolium)

0.5 0.15

Golden Alexanders (Zizia Aurea) 0.5 0.15 Wild Bergamot (Monarda Fistulosa) 0.4 0.12 Mistflower (Eupatorium Coelestinum) 0.3 0.09

Boneset (Eupatorium Perfoliatum) 0.3 0.09 Common Sneezeweed (Helenium 0.3 0.09 Autumnale) Path Rush (Juncus Tenuis) 0.3 0.09 Soft Rush (Juncus Effusus) 0.2 0.06 Gray Goldenrod (Solidago Nemoralis) 0.2 0.06 Wrinkleleaf Goldenrod (Solidago

Rugosa)

0.2 0.06

ERNMX-126 Infiltration Basin Seed Mix

30.0 Total

Deertongue (Panicum Clandestinum) 20.0 6.0 Alkaligrass (Puccinellia Distans) 20.0 6.0 Virginia Wildeye (Elymus Virginicus) 18.0 5.4 Creeping Bentgrass (Agrostis

Stolonifera)

15.0 4.5

Fowl Bluegrass (Poa Palustris) 15.0 4.5 Fox Sedge (Carex Vulpinoidea) 10.0 3.00 Blunt Broom Sedge (Carex Scoparia) 1.0 0.30 Soft Rush (Juncus Effusus) 1.0 0.30

SEQUENCE OF BMP INSTALLATION AND REMOVAL

General Notes

1. At least 7 days before starting any earth disturbance activities (including clearing and grubbing), the owner and/or operator shall invite all contractors, the landowner, appropriate municipal officials, the E&S plan preparer, the PCSM plan preparer and a representative from the conservation district to an on-site preconstruction meeting.

2. Upon the installation or stabilization of all perimeter sediment control BMPs and at least 3 days prior to proceeding with the bulk earth disturbance activities, the permittee or co-permittee shall provide notification to the Department or authorized Conservation District.

3. At least 3 days before starting any earth disturbance activities, or expanding into an area previously unmarked, the Pennsylvania one call system, Inc. shall be notified at 1-800-242-1776 for the location of existing underground utilities.

4. All earth disturbance activities shall proceed in accordance with the sequence provided on the plan drawings. Deviation from that sequence must be approved by the conservation district or by the department prior to implementation. Each step of the sequence shall be completed before proceeding to the next step.

5. Construction of swales and culverts shall be performed from downstream to upstream.

6. Provide permanent seed and mulch to all areas disturbed by construction activities.

7. Contractor shall use caution while constructing all sediment / infiltration basins as to avoid compacting the basin bottom to preserve infiltration rates.

8. If groundwater is encountered during construction, excavations must be dewatered via pumped water filter bag and discharge to a stable, well vegetated area.

9. Upon temporary cessation of earth disturbance activity, or any stage or phase of an activity where cessation of earth disturbance activities will exceed 4 days, the site shall be immediately seeded, mulched, or otherwise protected from accelerated erosion and sedimentation pending future earth disturbance activities. During non-germinating periods, mulch must be applied at the recommended rates.

10. Within 30 days after the completion of earth disturbance activities authorized by this permit, including the permanent stabilization of the site and proper installation of PCSM BMPs in accordance with the approved PCSM plan, or upon submission if not sooner, the permittee shall file with the department or authorized conservation district a statement signed by a licensed professional and by the permittee certifying that the work has been performed in accordance with the terms and conditions of this permit and the approved E&S and PCSM plans.

11. Fill slopes should be seeded and mulched at regular vertical increments, 15 to 25 feet maximum, as the fill is being constructed. This will allow the bottom of the fill to progress toward stabilization while work continues on the upper portion, making final stabilization easier to achieve and providing some vegetative buffering at the bottom of the slope.

12. As soon as the slopes, channels, ditches, and other disturbed areas reach final grade they must be stabilized. Upon completion or temporary cessation of the earth disturbance activity in a special protection watershed, that portion of the project site tributary to the special protection waters must be immediately stabilized. In all other watersheds, cessation of activity for at least 4 days requires temporary stabilization.

13. Field-mark out limits of disturbance.

CRITICAL STAGES OF PCSM BMP INSTALLATION

DURING THE FOLLOWING CRITICAL STAGES OF PCSM BMP INSTALLATION, A LICENSED

PROFESSIONAL ENGINEER SHALL OVERSEE THE ACTIVITIES DURING THE

CONSTRUCTION SEQUENCE STEPS INDICATED BELOW.

A. Construction and Stabilization of Sediment Trap E (Sequence Step - #4)

B. Conversion of Sediment Basin B Forebay to Infiltration Basin #11 (Sequence Step - #10)

C. Conversion of Sediment Basin B to Infiltration Basin #5 (Sequence Step - #10)

D. Conversion of Sediment Basin D to Infiltration Basin #4 (Sequence Step - #10)

F. Conversion of Sediment Trap E to Raingarden #12 (Sequence Step - #10)

Note: All Sequence Steps below shall be completed in accordance with the E&S Plan and Construction Details. All proposed Sediment Basins Lots have been built and stabilized in accordance with the previously approved E&S Plan.

Construction Sequence – Railroad Spur, Lots #2 and #4

1. Install Compost Filter Sock SS-38 through SS-42 in accordance with Plan and Construction Details.

2. Install Compost Filter Sock SS-14 through SS-16 in accordance with Plan and Construction Details.

3. Construct Rock Construction Entrance on Lot #4 in accordance with Plan and Construction Details.

4. Construct Sediment Trap E, Outlet Structure, Discharge Pipe, Anti-Seep Collars, and Rock Apron in accordance with Plan and Construction Details.

5. Convey all site runoff from Lot #2 and Railroad Spur to Sediment Trap E and existing Sediment Basins

B, C and D.

6. Complete Railroad Spur fill placement to sub-grade elevation.

7. Construct Perforated 8” Underdrain Pipes in Railroad Spur off-loading area. Construct 12” cross-pipes

(P5-22, P5-25, and 5-28) and rock aprons in accordance with the plan and details.

8. Complete the rail spur rock ballast, ties, and rail placement in accordance with plan and details.

9. Topsoil, seed and mulch mat disturbed areas when finished elevations are achieved along railroad spur.

10. Upon achieving a minimum uniform 70% perennial vegetative cover or other permanent non-vegetative cover with a density sufficient to resist accelerated surface erosion and subsurface characteristics sufficient to resist sliding and other movements for the Construction Drainage Area directed to Sediment Trap E and Sediment Basins B, C, and D convert trap and basins to their permanent rain garden and Infiltration Basin conditions in accordance with the plan and details. Refer to BMP Sequence of Construction for Sediment Trap/Basin conversion to Permanent Detention/Infiltration Basins.

11. Remove compost filter sock, rock construction entrance and concrete washout BMPs. Immediately stabilize any disturbance removing the BMPs.

Construction Sequence for Sediment Basin / Trap Conversion to Permanent Detention Basin / Infiltration Basin Upon permanent stabilization of the site, the following sequence should be followed for the conversion of the sediment basins into permanent detention basins / infiltration basins.

1. Flush accumulated sediment from the contributing storm sewer system.

2. Dewater sediment basin using Standard Construction Detail #7-18 as shown on the plans.

3. Remove all temporary facilities including the baffle, cleanout stake, and dewatering facilities.

4. Remove sediment from the basin to match final basin elevations and spread on-site while immediately stabilizing the disturbed areas with permanent seed and mulch.

5. Basins receiving permeable soil mixture shall be excavated to the required depths and processed fill shall be placed in 8-in lifts and compacted to the proper specifications.

6. Install underdrain and permeable soil mixture in accordance with the plan and construction details.

Immediately stabilize the interior of the permanent basin ensuring sediment does not enter the permanent orifice or weir until the interior of the permanent basin/rain garden is stabilized. Upon stabilization, remove marine grade plywood blocking the permanent orifice configuration, if present.

7. Construct Basin Forebay(s) in accordance with plan and construction details.

8. Immediately stabilize any remaining disturbed areas with permanent seed, mulch, lime, and fertilizer as per plan.

OPERATION AND MAINTENANCE OF E&S BMPS

1. All erosion and sedimentation control measures must be inspected at least weekly and after each runoff producing storm event by a qualified site personnel, trained and experienced in erosion and sediment control. Sediment removed from erosion and sediment controls shall be added to topsoil stockpiles on site and used for final restoration of the site. All preventative and remedial maintenance work, including clean out, repair, replacement, regrading, reseeding, re-mulching and re-netting must be performed immediately. If erosion and sedimentation control BMPs shown on the drawings fail to perform as expected, replacement BMPs, or modifications of those installed will be required.

2. Rock construction entrance thickness shall be constantly maintained to the specified dimensions by adding rock. A stockpile shall be maintained on-site for this purpose. At the end of each construction day, all sediment left on paved roadways shall be removed and returned to the construction site. The rock construction entrance(s) shall be disposed of by grading and blending the stone entrance into the subbase immediately prior to paving the driveway entrance.

3. Inspect silt socks immediately after each rainfall event and at least daily during prolonged rainfall.

Make any repairs immediately. The silt socks are not designed to be placed in areas of concentrated flow. Sediment shall be removed when it reaches ½ the height of the silt sock. Silt socks shall be inspected weekly and after each runoff event. The silt socks shall be repaired or replaced immediately after any damage occurs. Upon stabilization of the tributary area, the filter sock may be left in place and vegetated or removed. In the latter case, the mesh is typically cut open and the mulch spread as a soil supplement. In either case, the stakes should be removed.

4. Rock filters should be inspected weekly and after each rain event. Clogged filter stone (AASHTO #57) should be replaced. Needed repairs should be initiated immediately after the inspection. Sediment shall be removed when accumulations reach 1/2 the height of the filter. Immediately upon stabilization of each channel, installer shall remove accumulated sediment, remove rock filter, and stabilize disturbed areas. Sediment and the stone shall be spread on site and seeded.

5. Inspect all sediment traps and basins on at least a weekly basis and after each runoff event. Provide access for sediment removal and other required maintenance activities. Remove sediment and restore the basin to its original dimensions when the sediment has accumulated to the level shown on the sediment clean-out stake located near the center of the trap/basin. Dispose of materials removed from the trap/basin in the manner described in these notes. Repair clogged or damaged spillways immediately. Remove trash and other debris from the trap/basin riser. Check trap/basin embankments, spillways, and outlets for erosion, piping, and settlement. Make necessary repairs immediately.

Replace displace riprap within the outlet energy dissipater immediately after it is displaced and especially after major storm discharge events. Remove accumulated sediment and stabilize disturbed areas inside the trap/basin before any sediment trap/basin may be converted to a stormwater management facility. To assist in removing sediment, which is usually saturated, a device such as shown on standard construction detail No. 10 may be used to dewater the sediment prior to its removal.

Add rock filters as necessary.

6. Rock Aprons and Stilling Basins: Inspect rock aprons and stilling basins annually and after each significant rainfall event. Replace rip-rap which has been moved from its constructed position. Repair or replace torn or damaged geo-textile.

7. Check all seeded areas regularly to ensure that a good stand of vegetation is maintained. Areas to be permanently stabilized with vegetation shall be frequently checked and closely monitored for effectiveness in controlling erosive stormwater runoff velocities and sediment transport. Areas shall be re-mulched as often as necessary until adequate ground cover is established (minimum 70% uniform perennial vegetative cover).

8. The contractor is responsible for the maintenance of the temporary and permanent erosion and sedimentation controls during the construction period and until final acceptance of the project by the owner. The owner will assume full responsibility for the maintenance of the permanent erosion and sedimentation controls upon completion of the project and final acceptance by the owner.

9. Upon reduction, loss, or failure of any BMP, immediate action shall be taken to restore, repair, or replace the bmp to ensure no pollution discharges to the waters of the commonwealth.

10. Filter bags shall be inspected daily. If any problem is detected, pumping shall cease immediately and not resume until the problem is corrected. A suitable means of accessing the bag with machinery required for disposal purposes shall be provided. Filter bags shall be replaced when they become 1/2 full of sediment. Spare bags shall be kept available for replacement of those that have failed or are filled. Bags shall be placed on straps to facilitate removal unless bags come with lifting straps already attached. Filter bags shall be removed and properly disposed of, in accordance with PA code, Title 25, Chapter 102, when they are no longer needed or are at sediment capacity.

11. The permittee and co-permittee(s) must ensure that visual site inspections are conducted weekly, and within 24 hours after each measurable rainfall event throughout the duration of construction and until the receipt and acknowledgement of the NOT by the department or authorized conservation district.

The visual site inspections and reports shall be completed in a format provided by the department, and conducted by qualified personnel, trained and experienced in erosion and sediment control, to ascertain the E&S BMPs and PCSM BMPs are properly constructed and maintained to effectively minimize pollution to the waters of this Commonwealth.

RECYCLING AND DISPOSAL OF MATERIALS

The construction wastes that are expected to be encountered during construction include, but are not limited to:

building materials, pipe cutoffs, geotextile scraps, concrete wash water, sanitary wastes, etc.

All waste material must be disposed/recycled in accordance with PA code, Title 25, Chapter 102. Compost filter socks can be cut open and spread across the site. The construction entrances shall be graded into driveways before paving. Excess sediment removed from the E&S BMPs shall be spread onsite and immediately stabilized.

All building materials and wastes shall be removed from the site and recycled or disposed of in accordance with the Department’s Solid Waste Management Regulations at 25 Pa. Code 260.1 et seq., 271.1, and 287.1 et.

seq. No building materials or wastes or unused building materials shall be burned, buried, dumped, or discharged at the site.

NATURALLY OCCURRING GEOLOGIC FORMATIONS OR SOIL CONDITIONS

There are no known geologic formations or soil conditions that may have the potential to cause pollution during the site construction.

THERMAL IMPACTS

Thermal pollution will be mitigated through the infiltration of stormwater in vegetated areas and infiltration BMPs. Vegetated swales will collect runoff from impervious areas and are designed at a relatively flat slope to promote infiltration. Runoff from the vegetated swales will discharge into raingardens and infiltration basins, where it will also be stored in the proposed planting soils or infiltrated across the bottom area of the BMPs.

Roof coverings will be light colored to reduce thermal pollution and runoff from the roof area will be piped, allowing runoff to cool prior to reaching the BMPs. These attributes will help minimize and mitigate the potential thermal impacts of the proposed improvements.

REGULATORY CONCURRENCE

The E&S Plan and Report were prepared to meet the requirements of PA Code, Chapter 102.

As cited in the PA Code:

102.2(a) “This chapter requires persons proposing or conducting earth disturbance activities to develop, implement and maintain BMPs to minimize the potential for accelerated erosion and sedimentation.”

102.4(b)(3) “The Erosion and Sediment Control Plan shall be prepared by a…