3-3. Hillendale 2025 Annual GWMR (Nov. 2025) includes permit.pdf

HILLENDALE WASTEWATER TREATMENT PLANT

ANNUAL GROUNDWATER MONITORING REPORT

WQM PART II PERMIT NO. 1507406

Prepared For:

East Brandywine Township Municipal Authority

April 2025

Submitted By:

1691 Horseshoe Pike, Suite 2

Glenmoore, PA 19343

Project Number: EBMA10806

HILLENDALE WASTEWATER TREATMENT PLANT

ANNUAL GROUNDWATER MONITORING REPORT

2024- 2025

East Brandywine Township Municipal Authority

Chester County, PA

TABLE OF CONTENTS

Section

1 General Information

2 Site Information

3 Construction Details for MW-1 to MW-11 and Springhead No. 2

4 Site History

5 Monitoring Well Sampling Data (2020-2025)

6 WQM Permit No. 1507406 (2023-2028)

7 Comprehensive Groundwater Evaluation (CGE)

SECTION 1

GENERAL INFORMATION

General Information

1. Facility Name: Hillendale Sewage Treatment Plant (HSTP)

2. Facility Permit Number: 1507406

3. Proposed Facility Location: 276 Arters Way, Downingtown, PA, East Brandywine

Township, Chester County

4. Facility Contact Information:

Permittee: East Brandywine Township Municipal Authority

1214 Horseshoe Pike

Downingtown, PA 19335

Phone: 610-269-8230

Contact: Gabby Brown

Municipal Authority Secretary

Operator: EEMA O&M Services Group Inc.

140 Clemens Road (Suite 101)

Harleysville, PA 19438

Phone: 215-368-3375

Contact: John Dean

Consultant: Hydraterra Professionals

1691 Horseshoe Pike

Glenmoore, PA 19343

Phone: 610-942-3000

Contact: Joseph Boldaz, PE

Authority Engineer

SECTION 2

SITE INFORMATION

Site Information

Narrative:

The Hillendale Subdivision aka Estates at Dowlin Forge development in East Brandywine

Township, Chester County is comprised of 211 mixed single-family homes & townhouses. The development, originally owned by Metropolitan Development Group, was started in 3rd quarter of 2016. In November 2017, the first homes were occupied and as of April 2023, 210 homes were occupied. Average daily wastewater flow for the development is 55,387 gallons. From

March 2024 to February 2025, the average daily flow was approximately 34,143 gpd.

In December 2020, the drip disposal fields, the sewage treatment plant, and pump stations were all substantially completed and operational. The East Brandywine Township Municipal

Authority (EBTMA) accepted dedication of the facilities in May 2021.

In August 2021, a Water Quality Management (WQM) amendment was issued by PADEP. The amendment involved modifications to the drip irrigation design based on unanticipated obstacles encountered during installation.

On September 2, 2021, a significant rainfall event of over 8” occurred (from Hurricane Ida) which exposed drip disposal tubing throughout Drip Areas 1-4. Exposed drip tubing is in the process of being covered per the manufacturer’s requirements. Inspections of the drip disposal areas are completed quarterly.

On October 11, 2022, there was damage that occurred to drip disposal Zone 13B. The damage occurred adjacent to a PECO powerline easement that runs perpendicular to Nicols Mill Road within the development. A settlement was reached for the damages to drip tubing and the replacement of that tubing.

Soil Type and Bedrock Lithology

Section 6 of the Hillendale Subdivision Planning Module provides the following description of the soil type and bedrock lithology.

“Permeability is reported as moderate to moderately rapid [between 0.63 to 2.0 inches per hour2 (1.26 – 4 feet/day)]. The A horizon is black, with weak fine granular structure. The soil texture in the A horizon ranges from a sandy loam, loam to silt loam, with channery or gravelly coarse fragments”

“Two bedrock units are mapped by Sloto beneath the 140-acre Hillendale property. These rock units consist of Chickies quartzite and felsic and intermediate gneiss. The contact between the quartzite and gneiss divides the site approximately the site approximately in half the north and south across the site.”

The site geology is also depicted on Figure B-1 below, which was prepared on the basis of the DCNR website geologic map. On this map, the bedrock at the northern section of the site is mapped as felsic and intermediate gneiss and graphite and felsic gneiss, with

Chickies quartzite at the southern section of the site. As presented in the monitoring well logs, during the installation of the monitoring wells quartzite bedrock was encountered in

MWs 1, 2, and 8-11, at depths of between approximately 5-24 feet below grade, and gneiss bedrock was encountered in MWs 3-7 at depths of approximately 7-22 feet below grade.

Site Drawing

Monitoring Well Location Plan below shows the location of the active monitoring wells, in relation to the Township roadways, HSTP, and the subsurface drip disposal areas.

Site Data

Average effluent flow from March 2024 to April 2025: 34,143 gpd.

The table below presents the groundwater elevation data as recorded during the initial drilling and the hydrogeological testing conducted by E.B. Walsh and Associates, Inc.

** Table is excerpted from the Sewage Facilities Planning Module.

MONITORING WELL LOCATION PLAN

SECTION 3

MONITORING WELL

CONSTRUCTION DETAILS

(MW- 1 TO MW- 11)

SECTION 4

SITE HISTORY

Site History

June 3, 2005: 1st Background Samples taken

October 9, 2007: Planning Module Approved

August 20, 2008: Initial WQM Part II Permit issued

June 18, 2013:

December 16, 2014:

3rd Quarter 2016:

March 1, 2018:

July 2019:

December 2020:

August 2021:

September 2, 2022

October 2022

WQM Part II Permit reissued

Discussed background groundwater monitoring with Peter Evans

Hydrogeologist at PADEP background monitoring will commence approximately 6 months prior to STP operations.

Start of STP construction

WQM Part II Permit reissued

Drip Disposal Fields and WWTP under construction

Drip Disposal Fields and STP operational

WQM Permit Amendment issued

Hurricane Ida (approx. 8” of rainfall)- erosion to drip fields

PECO damaged Drip Area 2, was repaired and retested

SECTION 5

MONITORING WELL SAMPLING DATA (2020-2025)

Hillendale STP Monitoring Well Data

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 10/11/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/4/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

- 39.02 41.95 33.62 26.52 31.09 34.91 38.61 28.35 40.54 42.7 37.37 37.23 41.15 45.69 25.55 29.6 38.15 46.9 51.2

68.4 68.4 68.4 68.4 68.4 68.4 68.4 - - - - - - - - - - - - -

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 10/11/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/30/2024 12/4/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

- 30.85 32.11 29.70 26.91 27.90 29.82 31.54 26.80 31.35 32.75 30.70 30.61 32.05 33.56 25.65 27.08 37 34.37 35.88

41.6 41.6 41.6 41.6 41.6 41.6 41.6 - - - - - - - - - - - - -

Tree blocking GWMW 2, Township removed tree at later date after Suburban notified EEMA, Suburban came back three weeks later and took the measurement and sent it in. No idea why

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 12/28/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/4/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

3.0 < 5.00 < 5.00 < 5.00 < 5.00 <5.00 <5.00 <5.00 <5.00 11.5 47.9 21 54.4 44.7 69.8 18.7 17.9 34 71.9 83.1

<0.05 < 0.10 < 0.10 0.11 < 0.10 <0.10 0.14 <0.10 <0.10 <0.10 0.14 <0.10 <0.10 0.13 <0.10 <0.10 0.11 0.13 <0.10 <0.10 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10

0.25 < 1.00 < 1.00 < 1.00 < 1.00 <1.00 <1.00 <1.00 <1.00 1.04 3.83 1.37 1.56 1.88 3.59 <1.00 <1.00 2.13 2.23 3

<0.007 0.18 < 0.10 0.16 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 8 23.0 26.0 < 20.0 < 20.0 <20.0 25 23 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0

0.30 1.00 < 1.00 < 1.00 < 1.00 <1.00 1.12 <1.00 <1.00 3.3 1.7 <1.00 <1.00 <1.00 <1.00 <1.00 1.1 <1.00 1 <1.00

91.0 40.0 75.0 55.0 41.2 56.0 58.0 58.0 61.0 74 149 91.0 156.0 184 191 89 92 130 214 243

5.55 4.89 5.01 4.98 4.72 4.26 4.85 4.15 4.44 5.04 5.26 5.01 4.74 4.83 5.24 5.44 5.09 5.27 5 4.92

- 8.51 7.92 < 1.00 10.40 8.98 7.33 7.61 9.26 9.16 8.87 8.16 11.80 8.41 7.71 9.95 9.99 7.4 9.08 8.45 <1 < 1 < 1 < 1 < 1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

- 31.08 27.50 25.13 25.38 28.87 29.45 24.73 25.52 31.15 29.42 24.56 27.30 30.9 28.8 20.9 29.05 30.96 31.1 28.82

- 44.0 44.0 44.0 44.0 44.0 44.0 44.0 44.0 40 44 44.0 44.0 44 42 44 44 44.8 44 44

- 40.0 40.0 40.0 40.0 40.0 40.0 40.0 40.0 40 40 40.0 40.0 40 40 40 40 40 40 40

- 11.9 12.4 12.4 11.6 11.6 12.4 12.0 11.6 12.3 12.8 12.0 11.6 12.6 5.24 12.1 12 12.6 12.8 12.4

- 75.6 87.7 82.9 61.0 79.0 85.9 75.9 82.2 124 277 156 265 238 318 144 145 180 307 370

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 12/28/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/4/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

2.0 < 5.00 < 5.00 < 5.00 120 174 120 29.7 111 108 155 169 151 154 166 161 131 137 150 191

<0.05 < 0.10 < 0.10 0.11 < 0.10 <0.10 0.24 <0.10 <0.10 <0.10 <0.10 <0.10 0.11 0.12 <0.10 0.12 <0.10 <0.10 <0.10 <0.10 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.19 <0.10 <0.10 <0.10 <0.10 <0.10

0.31 < 1.00 < 1.00 < 1.00 2.18 6.16 5.09 4.14 3.07 3.39 3.7 3.76 5.3 5.88 5.58 3.79 4.08 5.02 4.46 3.92

<0.007 0.12 < 0.10 < 0.10 0.1 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 10 < 20.0 25.8 < 20.0 < 20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0

21.0 59.2 24.8 9.08 2.30 12.0 12.9 4.2 4.7 32 23 12 10 30 23 70 8.3 3.8 2.8 3 101 70 61.0 60.0 368 472 246 268 291 352 328 411 430 472 352 330 355 340 361 406

5.51 5.04 4.56 5.52 4.68 4.59 4.59 4.39 4.49 4.77 4.59 4.94 4.59 4.58 4.92 5.04 4.82 5.14 4.18 4.67

- 10.2 9.26 9.72 11.2 8.97 7.99 6.48 8.2 8.42 7.99 7.35 10.1 7.3 8.06 9.25 8.46 8.52 8.21 7.24 2 < 1 < 1 < 1 < 1 <1 <1 < 1 <1 <1 <1 <1 <1 <1 <1 <1 <1 1 <1 <1

Monitoring Well 1 (Upgradient)

Monitoring Well 4 (Downgradient)

Monitoring Well 3 (Downgradient)

Monitoring Well 2 (Upgradient)

Well Depth (ft.)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l) Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l)

Static Water Level (ft.)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

Turbidity (NTU) TDS (mg/l) pH (s.u.)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Well Depth (ft.)

Ammonia as N (mg/l) Phosphate Total as P (mg/l)

Chloride (mg/l)

PA

R

A M

ETER

TESTED

Field Temp (C°) Conductivity (umhos/cm)

TDS (mg/l) pH (s.u.)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Sampling Depth (ft.)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l) Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l) Turbidity (NTU)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Sampling Depth (ft.)

Nitrite as N (mg/l) Nitrate as N (mg/l)

Field Temp (C°) Conductivity (umhos/cm)

Alkalinity (mg/l) Turbidity (NTU)

TDS (mg/l) pH (s.u.)

Well Depth (ft.)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l) Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l) Turbidity (NTU)

TDS (mg/l) pH (s.u.)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

- 44.95 46.12 40.92 44.10 36.94 39.21 39.44 39.75 41.9 38.55 39.02 39.96 43.3 39.94 37.4 40.48 41.3 40.1 39.89 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50 50

- 49.0 49.0 49.0 48.0 48.0 49.0 49.0 47.0 50 49 48.0 49.0 49 49 49 49 49 49 46

- 13.2 12.6 10.5 11.2 12.4 13.7 13.8 13.4 13.2 12.4 12.4 12.4 15.1 12.2 12.4 12.4 13 12.1 12.5

- 66.9 65.0 72.6 423 682 457 444 442 438 608 635 603 575 647 609 524 500 560 691

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 10/11/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/9/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

4.0 5.88 5.05 6.40 19.1 29.9 25.7 41.3 48.5 7.52 33.7 14.2 10 17.1 <5.00 8.67 16.6 16.4 16.8 10.5

<0.05 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.13 0.11 0.11 <0.10 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10

0.68 < 1.00 < 1.00 < 1.00 < 1.00 <1.00 1.03 1.25 1.4 1.39 <1.00 <1.00 <1.00 1.02 <1.00 <1.00 1.16 <1.00 <1.00 <1.00

<0.007 0.21 < 0.10 < 0.10 < 0.10 <0.10 <0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 16 20.9 < 20.0 < 20.0 < 20.0 <20.0 <20.0 < 20.0 <20.0 25 27.8 23.3 23 <20.0 21.5 20.6 <20.0 <20.0 <20.0 <20.0

8.30 < 1.00 1.13 < 1.00 < 1.00 <1.00 <1.00 <1.00 <1.00 8.7 12 1.6 3 <1.00 1.5 7.5 1.3 <1.00 <1.00 <1.00 88 41.0 108 41.0 88.8 114 78 116 128 76 105 65 58 81 42 57 66 65 76 66

5.46 4.30 5.37 4.99 4.81 4.19 4.57 4.93 4.49 5.55 5.47 5.32 5.15 5.26 5 5.8 4.65 4.55 5.03 5.53

- 5.72 3.49 2.85 4.90 4.08 2.96 2.24 2.89 <1.00 7.99 <1.00 <1.00 <1.00 1.68 8.69 <1.00 <1.00 <1.00 <1.00 7 < 1 281 < 1 < 1 <1 <1 < 1 <1 18000 31 <1 1 <1 13 14 <1 <1 <1 <1

- 26.84 24.65 24.16 22.94 22.53 23.45 21.88 20.3 17.15 13.19 24.08 23.85 24.35 21.08 9.86 21.5 23.55 29.95 27.96

- 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.3 36.6 36.3 36.3 36.3 36.3 36.3

- 32.0 32.0 32.0 32.0 32.0 32.0 33.0 32.0 30 33 32.0 33.0 32 32 32 32 32 32 32

- 13.2 13.4 13.5 12.7 12.5 13.3 12.9 12.6 13 13.8 13.2 13.0 14 14.7 13.1 12.4 13.7 14.4 13.7

- 82.0 80.3 101 115 168 160 200 227 120 199 139 108 134 81.3 92.9 135 125 120 99.4

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 12/28/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/4/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

- 26.84 26.94 24.4 24.36 25.63 25.77 24.6 24.3 27.57 22.4 23.91 26.05 27 25.69 22.1 25.15 25.76 27 24.61

49.3 49.3 49.3 49.3 49.3 49.3 49.3 - - - - - - - - - - - - -

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 12/28/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/4/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

6.0 7.08 7.34 6.20 8.08 10.7 44.6 51.1 49 41.6 101 88.2 73.3 76.3 110 88.4 81.7 90.3 101 129

<0.05 < 1.00 < 0.10 < 0.10 < 0.10 <0.10 <0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.11 <0.10 <0.10 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10

3.57 5.14 5.25 3.41 3.92 4.39 4.05 3.92 3.57 4.34 3.86 4.27 4.53 4.92 4.27 3.64 3.72 4.45 3.42 3.66

<0.007 0.26 < 0.10 0.26 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 23 33.0 26.4 < 20.0 26.6 23.0 25.8 22.2 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0

<0.2 < 1.00 < 1.00 < 1.00 < 1.00 <1.00 2.36 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 2 1.1 <1.00 <1.00 <1.00 106 118 98.0 87.0 112 104 143 178 207 216 264 244 252 219 270 251 294 249 305 346

5.56 4.64 4.76 5.18 5.40 4.50 5.17 5.26 4.69 5.28 4.88 5.32 5.28 5.04 4.76 5.13 5.29 5.04 5.28 5.59

- 11.0 7.36 10.6 6.32 9.28 9.32 8.95 8.99 <1.00 8.97 7.78 9.81 8.77 8.33 11.7 11 8.12 9.44 8.73 <1 < 1 < 1 < 1 < 1 <1 <1 < 1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

35.6 37.5 37.2 36.4 36.0 36.1 36.0 36.1 36.0 36.85 35.4 36.0 36.3 36.45 36.2 35.15 36.22 38.07 36.08 36.19

- 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5 50.5

- 45.0 45.0 45.0 45.0 46.0 45.0 46.0 45.0 45 46 46.0 45.0 45 46 45 45 45 45 45

- 11.3 11.2 11.6 12.6 11.2 11.4 11.5 11.3 11.1 11.5 11.4 11.2 11.4 11.6 11.7 11.5 11.7 11.8 11.8

- 143 154 158 123 152 239 256 261 249 431 375 348 344 451 372 363 355 406 489

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 10/11/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/9/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025 9 6.66 7.99 7.14 6.45 7.54 7.96 10.2 8.59 9.45 8.49 7.89 9.68 9.76 12.5 10.2 7.3 9.83 14.3 23.9

<0.05 0.12 < 0.10 0.14 < 0.10 <0.10 <0.10 <0.10 <0.10 0.1 0.1 <0.10 <0.10 <0.10 <0.10 0.11 <0.10 <0.10 <0.10 <0.10 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10

3.11 2.37 3.16 2.62 2.08 1.81 1.71 2.66 1.79 1.91 1.97 1.34 1.37 1.35 1.66 1.64 1.02 1.12 1.02 1.52

<0.007 0.21 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.17 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 20 30.6 < 20.0 < 20.0 26.4 24.6 37.7 28.4 26.7 23.2 26.9 26.6 26.6 25.8 25.8 23 26.1 25.2 25.5 27.1

150.0 5.33 1.98 26.6 2.91 <1.00 1.23 3.2 1.2 7.3 <1.00 <1.00 1 2.7 <1.00 2.1 1.3 1.6 4.2 1.2

Monitoring Well 8 (Upgradient)

Monitoring Well 7 (Downgradient)

Monitoring Well 6 (Downgradient)

Monitoring Well 5 (Upgradient)

Well Depth (ft.)

Well Depth (ft.)

Well Depth (ft.)

Well Depth (ft.)

Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l) Turbidity (NTU)

TDS (mg/l) pH (s.u.)

PA

R

A M

ETER

TESTED

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

Turbidity (NTU) TDS (mg/l) pH (s.u.)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Static Water Level (ft.)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l) Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l)

Phosphate Total as P (mg/l) Ammonia as N (mg/l)

Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l) Turbidity (NTU)

TDS (mg/l) pH (s.u.)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

Turbidity (NTU) Alkalinity (mg/l)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

PA

R

A M

ETER

TESTED

Chloride (mg/l)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l) Nitrate as N (mg/l) Nitrite as N (mg/l)

97 67.0 105 116 76.2 76.0 34.0 76.0 73 80 72 62.0 76 79 81 78 73 62 92 124

5.74 5.04 5.14 5.21 5.23 4.52 4.7 4.98 4.94 5.29 4.98 5.03 5.03 4.85 4.89 5.25 4.67 5.35 5.5 5.75

- 8.09 8.32 6.87 8.09 6.96 7.14 6.47 6.8 6.7 5.28 5.87 8.27 6.89 5.12 7.46 7.8 6.83 6.71 6.06 <1 < 1 < 1 < 1 < 1 <1 <1 <1 <1 <1 2 <1 <1 <1 <1 <1 <1 <1 <1 <1

- 64.55 64.68 63.91 64.25 63.70 64.2 65.02 63.32 65.92 63.88 64.26 65.4 64.8 65.28 61.08 63.38 64.66 67.8 66.31

- 101.5 101.5 101.5 101.5 101.5 101.5 101.5 101.5 101.5 101.5 101.5 101.5 101.5 101.5 4 101.5 101.5 101.5 101.5

- 96.0 96.0 96.0 96.0 95.0 90.0 96.0 85 96 94 96.0 90 96 96 96 94 95 96 95

- 12.18 12.12 12.1 12.4 12.7 12.3 12.2 12.6 13 12.3 12.8 13.1 14 12.8 13.1 13.2 13.4 13.3 13

- 107 117 141 93.7 109 107 117 122 123 124 113 124 119 132 126 112 112 124 166

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 10/11/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/9/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

45.0 47.3 49.6 41.6 49.0 48.9 50.0 55.5 55 60.9 84.9 116 108 126 164 171 159 174 178 191

<0.05 0.11 < 0.10 0.12 0.17 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.1 <0.10 <0.10 <0.10 0.13 <0.10 <0.10 <0.10 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10

1.17 1.49 1.55 1.43 1.49 1.71 1.89 1.87 1.89 2.36 2.22 2.34 2.86 3.42 2.8 2.73 3.08 3.37 2.96 3.04

<0.007 0.35 < 0.10 0.43 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 28 47.0 36.6 22.6 28.9 29.8 37.1 33.4 26.2 25.4 <20.0 20.8 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0

0.6 < 1.00 < 1.00 < 1.00 146 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 195 248 270 181 237 232 176 154 229 280 272 354 281 481 353 388 417 460 468 482

5.71 5.27 5.74 5.41 5.43 5.20 5.08 5.0 4.86 5.76 5.53 5.4 5.47 5.26 5.31 5.53 5.3 5.35 5.27 5.23

- 8.39 7.31 7.26 4.85 8.01 7.83 6.48 7.09 8.11 8.61 7.17 7.8 8.4 7.51 9.83 8.55 7.15 7.95 7.62 <1 < 1 < 1 < 1 < 1 <1 <1 < 1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

- 49.4 50.27 43.9 45.03 46.70 47.38 45.1 44.7 48.32 42.38 44.42 45.48 45.09 43.8 41.18 44.76 50.15 46.3 44.66

- 62.0 62.0 62.0 62.0 62.0 62.0 62.0 62.0 62 60 62.0 62.0 62 62 62 62 62 62 62

- 60.0 60.0 60.0 60.0 58.0 59.0 60.0 60.0 55 52 55.0 60.0 57 60 60 58 60 60 57

- 11.9 11.8 11.8 13.5 12.0 11.8 12.0 12.0 11.8 11.8 12.3 12.2 12.6 12.3 5.53 12.3 14.1 12.5 12.4

- 285 291 305 257 283 283 283 301 323 384 477 454 500 633 650 637 623 653 697

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 10/11/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/9/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

8.0 < 5.00 8.43 5.62 14.4 11.2 6.71 6.05 16 11.8 98.3 136 123 140 150 126 120 122 120 157

<0.05 0.58 0.12 0.10 0.10 0.11 0.24 0.34 0.1 0.29 <0.10 0.1 0.1 <0.10 0.1 0.1 0.17 0.1 <0.10 <0.10 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10

3.39 5.36 4.87 9.39 8.22 7.75 6.28 4.15 2.39 2.72 1.11 1.5 3.96 5.97 3.64 1.66 1.81 1.18 <1.00 <1.00

<0.007 0.20 < 0.10 0.17 < 0.10 <0.10 <0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 55 77.3 58.1 52.2 50.3 46.7 71.4 59.0 54.7 44.6 50.3 34.2 31.5 36.9 43 34.6 35 43.1 46.9 51.1

3.6 335.0 64.4 13.6 2.7 37.0 300.0 180.0 2.1 290 2.7 2.9 4.7 1.2 1.2 <1.00 145 2.1 38 3.1 103 114 106 164 195 146 108 157 113 129 305 384 387 518 361 350 400 331 303 516

6.04 5.72 6.35 6.44 6.04 5.50 5.22 5.92 5.46 6.43 6.29 6.06 6.20 6.33 6.01 6.28 5.75 5.84 5.88 6.06

- 10.7 9.60 9.65 8.61 10.4 9.8 9.3 10.5 10.2 11 9.33 10.4 9.8 9.48 12.7 10.3 9.98 9.92 8.9 <1 < 1 < 1 < 1 < 1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

- 38.8 39.3 38.6 37.9 38.3 38.5 38.3 37.8 38.56 37.03 37.8 39.3 38.42 37.93 36.41 39.4 39.4 39.3 38.6

- 51.6 51.6 51.6 51.6 51.6 51.6 51.6 51.6 51.6 49.6 51.6 51.6 51.6 51.6 51.6 51.6 51.6 51.6 51.6

- 50.0 50.0 50.0 50.0 48.0 50.0 50.0 50.0 49 45 48.0 50.0 47 50 50 50 50 50 48

- 12.5 12.6 12.4 13.9 12.8 12.6 13.2 13.1 12.6 12.7 13.4 14.7 13.1 13 13.6 13.3 13.3 13.2 13.2

- 195 193 252 201 209 191 164 188 173 445 563 517 588 613 523 511 486 496 615

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 10/11/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/9/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

10.00 6.67 7.73 11.60 28.70 22.60 22.00 28.60 20.70 20.6 24.5 24.40 20.10 15.5 16.1 9.86 8 13.2 16 89.1 <0.05 0.12 0.10 0.14 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.11 0.1 0.1 <0.10 0.2 <0.10 0.1 <0.10 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10

2.09 1.56 1.75 1.39 1.42 1.29 1.18 1.28 1.15 1.2 1.23 1.16 1.1 1.19 1.15 <1.00 <1.00 1.07 <1.00 <1.00

<0.007 0.16 < 0.10 0.19 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 26 39.7 29.0 24.2 28.0 25.1 42.4 33.1 30 25.7 29.2 28.2 28.2 28 30.6 24.3 27.3 27.4 28.3 27.7

1.2 < 1.00 < 1.00 < 1 1.02 <1.00 <1.00 <1.00 <1.00 1.1 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 <1.00 112 81.0 87.0 75.0 189 108 78 123 117 118 195 101 109 84 86 67 71 76 97 293

5.9 4.91 5.70 5.63 5.59 5.03 5.1 5.69 5.33 5.63 5.43 5.64 5.48 5.2 5.62 5.31 5.27 5.42 5.88 6.1

- 13.8 10.6 8.38 6.67 9.97 9.21 8.69 9.18 9.79 6.73 7.08 10.5 9.02 5.01 9.69 10.2 9.82 8.7 7.71

<1 < 1 < 1 < 1 < 1 <1 1 < 1 <1 3 <1 <1 <1 <1 <1 <1 <1 <1 <1 <1

- 50.18 49.89 49.15 48.7 48.93 49.22 50.05 48.45 49.6 48.25 49.36 49.18 48.08 49.59 46.75 28.28 50.25 52.42 51.38

- 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6 60.6

- 55.0 55.0 55.0 55.0 56.0 55.0 55.0 56.0 55 57 56.0 57.0 55 56 55 55 55 55 56

- 12.3 12.2 12.1 13.7 12.6 12.3 12.2 12.6 12.5 12.2 12.8 13.1 13.9 13 13.1 12.8 12.9 13.2 13.1

- 127 137 164 167 180 174 191 165 174 195 186 171 155 155 130 128 137 150 361

Monitoring Well 11 (Sidegradient)

Monitoring Well 10 (Downgradient)

Monitoring Well 9 (Downgradient)

Well Depth (ft.)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l) Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l) Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l) Turbidity (NTU)

TDS (mg/l) pH (s.u.)

Well Depth (ft.)

Alkalinity (mg/l) Turbidity (NTU)

TDS (mg/l) pH (s.u.)

Well Depth (ft.)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

Turbidity (NTU) TDS (mg/l) pH (s.u.)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Well Depth (ft.)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

TDS (mg/l) pH (s.u.)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

PA

R

A M

ETER

TESTED

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l) Nitrate as N (mg/l) Nitrite as N (mg/l)

4/15/2020 9/23/2020 11/2/2020 1/27/2021 4/30/2021 7/19/2021 12/28/2021 3/14/2022 6/6/2022 9/12/2022 12/19/2022 3/20/2023 6/19/2023 9/19/2023 12/1/2023 3/25/2024 6/10/2024 9/9/2024 12/4/2024 3/3/2025 Q2 2025 Q3 2025 Q4 2025

5.0 8.69 8.87 7.81 11.8 13.8 28.2 52.2 40.7 41.3 87.2 68.8 52.7 48.3 78.8 130 90.4 86.5 80.5 131

<0.05 < 0.10 < 0.10 0.11 < 0.10 0.11 0.1 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 0.15 <0.1 < 0.10 < 0.10 < 0.10 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10

0.91 < 1.00 < 1.00 < 1.00 < 1.00 <1.00 1.9 2.01 1.5 1.62 2.06 2.16 1.83 1.77 2.31 2.3 1.8 1.8 1.76 2.35

<0.007 0.23 < 0.10 0.23 < 0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 <0.10 7 < 20.0 < 20.0 < 20.0 < 20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0 <20.0

0.30 < 1.00 < 1.00 < 1.00 < 1.00 <1.00 1.17 9.3 2.8 1 <1.00 <1.00 <1.00 1.1 <1.00 <1.00 2.9 <1.00 2 4.6 109 50.0 112 51.2 72.0 88.0 78 125 122 145 190 156 136 125 178 257 223 175 194 276

5.23 4.35 5.34 4.85 5.88 4.73 5 4.66 4.86 5.24 4.58 4.88 5.31 5.39 4.89 4.96 5.13 4.82 5.07 5.48

- 7.47 5.38 5.80 7.97 5.06 <1.00 6.12 6.07 7.27 5.17 5.98 5.6 7.14 6.88 10.4 5.64 5.6 9.82 6.04 <1 < 1 < 1 < 1 < 29 4 <1 <1 7 <1 <1 <1 <1 <1 1 <1 <1 <1 <1 <1

- 6.25 6.25 6.85 3.60 3.45 6.38 5.59 6.22 4.1 4.52 6.19 5.75 6.06 4.85 3.88 6.2 6.15 6.08 6.35

- 6.5 6.5 7.3 - 6.5 6.5 6.5 6.5 6.2 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5 6.5

- - - - - - - - - 0 0 0.5 0 0 0 0 0 0 0 0

- 14.2 11.1 9.7 13.4 15.5 10.1 9.8 13.4 14.9 9.71 9.97 16.1 13.4 9.29 10 13.8 12.7 11.2 9.82

- 90.1 90.7 104 106 121 161 197 198 203 359 291 240 219 324 490 359 303 309 478

Springhead Well No. 2 (Downgradient)

Nitrate as N (mg/l) Nitrite as N (mg/l) Alkalinity (mg/l)

Sampling Depth (ft.)

Field Temp (C°)

Conductivity (umhos/cm)

PA

R

A M

ETER

TESTED

Chloride (mg/l) Phosphate Total as P (mg/l)

Ammonia as N (mg/l)

Turbidity (NTU) TDS (mg/l) pH (s.u.)

Dissolved Oxygen Fecal Coliform-(MPN /100ml)

Static Water Level (ft.)

Well Depth (ft.)

SECTION 6

WQM Permit No. 1507406 Hillendale Sewage Treatment Plant

3850-PM-BCW0015d 3/2016 Permit

COMMONWEALTH OF PENNSYLVANIA

DEPARTMENT OF ENVIRONMENTAL PROTECTION

BUREAU OF CLEAN WATER

WATER QUALITY MANAGEMENT

PERMIT

PERMIT NO. 1507406

AMENDMENT NO. Renewal

APS ID. 1072557

AUTH. ID. 1412365

A. PERMITTEE (Name and Address): CLIENT ID#: 226713

East Brandywine Township Municipal Authority

1214 Horseshoe Pike

Downingtown, PA 19335-1132

B. PROJECT/FACILITY (Name):

Estates At Dowlin Forge Station Aka Hillendale STP

C. LOCATION (Municipality, County):

East Brandywine Township, Chester County

SITE ID#: 676460

D. This permit approves the operation of sewage facilities consisting of; a SBR to provide tertiary treatment followed by drip dispersal consisting of four (4) dispersal areas designated as Areas 1-4, which are subdivided into a total of 17 zones.

Pump Stations: Manure Storage: Sewage Treatment Facility:

Design Capacity: GPM Volume: MG Annual Average Flow: 0.055387 MGD

Freeboard: inches Design Hydraulic Capacity: 0.061388 MGD

Design Organic Capacity: 152 lb/day

E. APPROVAL GRANTED BY THIS PERMIT IS SUBJECT TO THE FOLLOWING:

1. New Permits: All construction, operations and procedures shall be in accordance with the Water Quality Management Permit application dated , its supporting documentation and addendums dated , which are hereby made a part of this permit.

Renewal: All construction, operations and procedures shall be in accordance with the Water Quality Management Permit Amendment application dated 09/29/2022 and its supporting documentation and addendums dated , which are hereby made a part of this amendment.

Except for any herein approved modifications, all terms, conditions, supporting documentation and addendums approved under Water Quality Management Permit No. dated shall remain in effect.

Transfers: Water Quality Management Permit No. dated and conditions, supporting documentation and addendums are also made part of this transfer.

2. Permit Conditions Relating to Sewerage are attached and made part of this permit.

3. Special Conditions I- X are attached and made part of this permit.

F. THE AUTHORITY GRANTED BY THIS PERMIT IS SUBJECT TO THE FOLLOWING FURTHER QUALIFICATIONS:

1. If there is a conflict between the application or its supporting documents and amendments and the attached conditions, the attached conditions shall apply.

2. Failure to comply with the rules and regulations of DEP or with the terms or conditions of this permit shall void the authority given to the permittee by the issuance of this permit.

3. This permit is issued pursuant to the Clean Streams Law Act of June 22, 1937, P.L. 1987, as amended 35 P.S. §691.1 et seq. Issuance of this permit shall not relieve the permittee of any responsibility under any other law.

4. This permit shall expire on 02/28/2028. The permittee shall submit an application to renew the permit no later than 180 days prior to the permit expiration date.

PERMIT ISSUED: BY:

Thomas L. Magge

TITLE: Clean Water Program Manager

Permit Effective: 03/08/2023 Southeast Regional Office

March 8,2023

3850-PM-BCW0015a Rev. 12/2019 Permit No. 1507406 Renewal Conditions Sewerage

- 1 -

COMMONWEALTH OF PENNSYLVANIA

DEPARTMENT OF ENVIRONMENTAL PROTECTION

BUREAU OF POINT AND NON-POINT SOURCE MANAGEMENT

PERMIT CONDITIONS RELATING TO SEWERAGE

For use in Water Quality Management Permits

(Check boxes that apply)

General

1. The Department of Environmental Protection (DEP) considers the licensed Professional Engineer whose seal is affixed to the design documents to be fully responsible for the adequacy of all aspects of the facility design.

2. The permittee shall adopt and enforce an ordinance requiring the abandonment of privies, cesspools or similar receptacles for human waste and onlot sewage disposal systems on the premises of occupied structures accessible to public sewers. All such structures must be connected to the public sewers.

3. The outfall sewer or drain shall be extended to the low water mark of the receiving body of water. Where necessary to ensure proper mixing and waste assimilation, an outfall sewer or drain may be extended with appurtenances below the low water mark and into the bed of a navigable stream provided that the permittee has secured an easement, right-of-way, license or lease from DEP in accordance with Section 15 of the Dam Safety and Encroachments Act, the Act of November 26, 1978, P.L. 1375, as amended.

4. The approval is specifically made contingent on the permittee acquiring all necessary property rights, by easement or otherwise, providing for the satisfactory construction, operation, maintenance and replacement of all sewers or sewerage structures in, along or across private property with full rights of ingress, egress and regress.

5. When construction of the approved sewerage facilities is completed and before they are placed in operation, the permittee shall notify DEP in writing so that a DEP representative may inspect the facilities.

6. The approval of the plans, and the authority granted in this permit, if not specifically extended, shall cease and be null and void 5 years from the issuance date of this permit unless construction or modification of the facilities covered by this permit has begun on or before the fifth anniversary of the permit date.

7. If, at any time, the sewerage facilities covered by this permit create a public nuisance, including but not limited to, causing malodors or causing environmental harm to waters of the Commonwealth, DEP may require the permittee to adopt appropriate remedial measures to abate the nuisance or harm.

8. If, after the issuance of this permit, DEP approves a municipal sewage facilities official plan or an amendment to an official plan under Act 537 (Pennsylvania Sewage Facilities Act, the Act of January 24, 1966, P.L. 1535 as amended) in which sewage from the herein approved facilities will be treated and disposed of at other planned facilities, the permittee shall, upon notification from the municipality or DEP, provide for the conveyance of its sewage to the planned facilities, abandon use and decommission the herein approved facilities including the proper disposal of solids, and notify DEP accordingly. The permittee shall adhere to schedules in the approved official plan, amendments to the plan, or other agreements between the permittee and municipality. This permit shall then, upon notice from DEP, terminate and become null and void and shall be relinquished to DEP.

9. This permit does not relieve the permittee of its obligations to comply with all federal, interstate, state or local laws, ordinances and regulations applicable to the sewerage facilities.

10. This permit does not give any real or personal property rights or grant any exclusive privileges, nor shall it be construed to grant or confirm any right, easement or interest in, on, to or over any lands which belong to the Commonwealth.

11. The authority granted by this permit is subject to all effluent requirements, monitoring requirements and other conditions as set forth in the NPDES Permit and all subsequent amendments and renewals. No discharge is authorized from these facilities unless approved by an NPDES Permit.

Construction

12. This permit is issued under the authorization of The Clean Streams Law and 25 Pa. Code Chapter 91. The permittee shall obtain all necessary permits, approvals and/or registrations under 25 Pa. Code Chapters 102, 105 and 106 prior to commencing construction of the facilities authorized by this permit, as applicable. The permittee should contact the DEP office that issued this permit if there are any questions concerning the applicability of additional permits.

3800-PM-BPNPSM0015a Rev. 12/2019 Permit No. 1507406 Conditions Sewerage

- 2 -

13. The facilities shall be constructed under the supervision of a Pennsylvania licensed Professional Engineer in accordance with the approved reports, plans and specifications.

14. A Pennsylvania licensed Professional Engineer shall certify that construction of the permitted facilities was completed in accordance with the application and design plans submitted to DEP, using the "Post Construction Certification" form (3800-PM-WSFR0179a). It is the permittee's responsibility to ensure that a Professional Engineer is on-site to provide the necessary oversight and/or inspections to certify the facilities. The certification must be submitted to DEP before the facility is placed in operation. As-built drawings, photographs (if available) and a description of all deviations from the application and design plans must be submitted to DEP within 30 days of certification.

15. Manhole inverts shall be formed to facilitate the flow of the sewage and to prevent the stranding of sewage solids. The manhole structure shall be built to prevent undue infiltration, entrance of street wash or grit and provide safe access to facilitate manhole maintenance activities.

16. The local Waterways Conservation Officer of the Pennsylvania Fish and Boat Commission (PFBC) shall be notified when the construction of any stream crossing and/or outfall is started and completed. A written permit must be secured from the PFBC if the use of explosives in any waterways is required and the permittee shall notify the local Waterways Conservation Officer when explosives are to be used.

Operation and Maintenance

17. The permittee shall maintain records of "as-built" plans showing all the treatment facilities as actually constructed together with facility operation and maintenance (O&M) manuals and any other relevant information that may be required. Upon request, the "as-built" plans and O&M manuals shall be filed with

DEP.

18. The sewers shall have adequate foundation support as soil conditions require. Trenches shall be back-filled to ensure that sewers will have proper structural stability, with minimum settling and adequate protection against breakage. Concrete used in connection with these sewers shall be protected from damage by water, freezing, drying or other harmful conditions until cured.

19. Stormwater from roofs, foundation drains, basement drains or other sources shall not be admitted directly to the sanitary sewers.

20. The approved sewers shall be maintained in good condition, kept free of deposits by flushing or other cleaning methods and repaired when necessary.

21. The sewerage facilities shall be properly operated and maintained to perform as designed.

22. The attention of the permittee is called to the highly explosive nature of certain gases generated by the digestion of sewage solids when these gases are mixed in proper proportions with air and to the highly toxic character of certain gases arising from such digestion or from sewage in poorly ventilated compartments or sewers. Therefore, at all places throughout the sewerage facilities where hazard of fire, explosion or danger from toxic gases may occur, the permittee shall post conspicuous permanent and legible warnings. The permittee shall instruct all employees concerning the aforesaid hazards, first aid and emergency methods of meeting such hazards and shall make all necessary equipment and material accessible.

23. An operator certified in accordance with the Water and Wastewater Systems Operator Certification Act of February 21, 2002, 63 P.S. §§1001, et seq. shall operate the sewage treatment plant.

24. The permittee shall properly control any industrial waste discharged into its sewerage system by regulating the rate and quality of such discharge, requiring necessary pretreatment and excluding industrial waste, if necessary, to protect the integrity or operation of the permittee's sewerage system.

25. There shall be no physical connection between a public water supply system and a sewer or appurtenance to it which would permit the passage of any sewage or polluted water into the potable water supply. No water pipe shall pass through or come in contact with any part of a sewer manhole.

26. All connections to the approved sanitary sewers must be in accordance with the official Act 537 Plan and, if applicable, a corrective action plan as contained in the approved Title 25 Pa. Code Chapter 94 Municipal Wasteload Management Annual Report.

27. Collected screenings, slurries, sludge and other solids shall be handled and disposed of in compliance with Title 25 Pa. Code Chapters 271, 273, 275, 283 and 285 (related to permits and requirements for land filling, land application, incineration and storage of sewage sludge), Federal Regulations 40 CFR 257 and the Federal Clean Water Act and its amendments.

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COMMONWEALTH OF PENNSYLVANIA

DEPARTMENT OF ENVIRONMENTAL PROTECTION

BUREAU OF CLEAN WATER

SPECIAL CONDITIONS

Water Quality Management Permit No. 1507406- Renewal

East Brandywine Township Municipal Authority Estates at Dowlin Forge Station AKA Hillendale Sewage Treatment Plant

I. Land Application and Treatment

Effluent from the sewage treatment plant shall be sampled from the sampling port prior to the effluent storage tank and shall be limited at all times as follows:

Parameter Monthly

Average (mg/l)

Instantaneous

Maximum**

Measurement

Frequency

Sample

Type

Influent Flow (GPD)

55,387

Continuous

Recorded

CBOD5

2/month

8-Hr Composite

Total Suspended Solids

Total Nitrogen* pH

6 - 9 S.U. at all times

Grab

Fecal Coliform

200/100 ml as geometric average

Grab

* Total Nitrogen = Total Kjeldahl Nitrogen + Nitrite (NO2) Nitrogen + Nitrate (NO3) Nitrogen

** Instantaneous maximum limitations are imposed to allow for a grab sample to be collected by the appropriate regulatory agency to determine compliance. The permittee does not have to monitor for the instantaneous maximum limitation except for the parameter’s temperature, oil and grease, pH, total residual chlorine, and fecal coliform. However, if grab samples are collected for parameters normally monitored through composite sampling, the results must be reported.

Additional treatment requirements include the satisfactory disposal of sludge and the reduction of quantities of oils, greases, acids, alkalis, toxics, taste and odor producing substances, inimical to the public interest to levels which will not pollute the receiving waters.

The results of all sampling activities are to be listed on a Supplemental Report form supplied by the Department and submitted to this office on a monthly basis.

The Total Nitrogen (expressed as N) content of an aqueous sample is determined by adding the individual analytical results (expressed as N) for Total Kjeldahl Nitrogen, Nitrite-Nitrogen, and Nitrate-

Nitrogen. Total Kjeldahl Nitrogen is the sum of Organic Nitrogen and Ammonia Nitrogen as determined by the Kjeldahl method.

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“Composite Sample” (for all except GC/MS volatile organic analysis) means a combination of individual samples (at least eight for a 24-hour period or four for an 8-hour period) of at least 100 milliliters each obtained at spaced time intervals during the compositing period. The composite must be

“flow-proportional,” which means either the volume of each individual sample is proportional to discharge flow rates, or the sampling interval is proportional to the flow rates over the time period used to produce the composite.

II. Submission of DMRs and Supplemental Reports

The permittee shall submit a Discharge Monitoring Report (DMR) containing a summary of self-monitoring data to DEP no later than 28 days following the end of each monthly reporting period. In addition, the permittee shall complete and submit all Supplemental Reports that are attached to this permit at the time the DMR is submitted, in accordance with the instructions to the Supplemental

Reports. Unless the permittee elects to use DEP’s electronic DMR (eDMR) system, the permittee shall submit paper copies of the DMR and Supplemental Reports to:

Department of Environmental Protection

Southeast Regional Office

Clean Water Program

2 East Main Street

Norristown, PA 19401

III. Groundwater Monitoring Requirements

The permittee shall effectively monitor the quality of the groundwater. The parameters to be tested, and frequency of analysis and other monitoring requirements shall be as follows:

A. Quarterly analysis of groundwater sampled at groundwater monitoring wells

MW-3, MW-4, MW-5, MW-7, MW-8, MW-9, MW-10, MW-11 and Springhead No. 2 shall consist of: static water level, sampling depth, turbidity, pH, chloride, total phosphorus, ammonia nitrogen, nitrate nitrogen, nitrite nitrogen, total dissolved solids, fecal coliform, and alkalinity.

B. Static water level shall be measured in groundwater monitoring wells

MW-1, MW-2, and MW-6 quarterly.

C. Groundwater elevations must be measured prior to purging the groundwater monitoring well.

D. Before collection of the groundwater sample, a groundwater monitoring well shall be properly purged and allowed to recover to at least 90 percent of the well volume that was present prior to purging.

E. All groundwater samples shall be collected from within the top five feet of the water elevation within the well column.

IV. Groundwater Monitoring Data Reporting Requirements

A. Annual Groundwater Report

All groundwater data shall be submitted to DEP annually and be in report form. The report shall be due to DEP within 28 days of the end of the month of permit issuance. For example, if your permit was

- 3 -issued on March 4th, then your annual report is due by April 28th. The annual report shall be mailed under separate cover and addressed to:

Department of Environmental Protection

Southeast Regional Office

Clean Water Program

2 East Main Street

Norristown, PA 19401

Attention: Hydrogeologist

Planning Section

The Annual Groundwater Monitoring Report shall include the following information:

1. General Information

a. Facility name

b. Facility permit number

c. Facility location (including municipality and county)

d. Facility contact information:

i. permittee name, address, e-mail address, and telephone number

ii. contact name and title

iii. facility operator name, address, e-mail address, and telephone number

iv. facility consultant name, address, e-mail address, and telephone number

2. Site Data

a. A brief narrative that provides the date and description of any facility event which may have impacted any part of the groundwater monitoring program. (e.g., collapse of groundwater monitoring well, etc.).

b. Average effluent flow for the year covered by the report.

c. In tabular form, the following information needs to be provided for at least the last 5 years of system operation:

i. Date of sampling.

ii. Groundwater elevation.

iii. Sampling depth.

iv. Identification of upgradient and downgradient wells.

v. The results of the analysis of the samples.

d. Background groundwater data generated prior to system start-up. This information is absolutely needed and needs to be included in the data tabulation.

B. Comprehensive Groundwater Evaluation (CGE)

As part of the facility’s 5-year permit renewal application, the permittee shall submit a report that is a result of a comprehensive evaluation of the systems impact on groundwater. A Registered

P.G. must identify any trends which may pose a threat to human health or certify that none are

- 4 -present. Should adverse impacts to groundwater be identified, the permittee needs to recommend actions to address the potential threat.

C. Groundwater Background Report

The existing Groundwater Background Report shall be updated as needed.

The Groundwater Background Report is a one-time report. Should future changes or additions occur for any information in this section, an addendum that can be added to the report is all that is needed to update this report.

V. Land Application Requirements:

A. Application of the effluent to drip dispersal fields shall be managed to prevent ponding, freezing, breakout, and run off. At no time may effluent be discharged to the ground surface.

B. The drip dispersal system area shall be inspected on a routine basis. System components including valves and piping shall be repaired/replaced immediately if any damage or malfunction occurs.

C. Drip fields established and maintained in low maintenance grass-like species shall be mowed at least two times a year, with at least 6 inches of growth remaining over the winter to aid in the prevention of drip tubing freezing. Mowing shall be conducted during dry soil conditions.

D. Drip fields shall be used for passive low impact use only.

E. At no time shall any debris be stockpiled on the drip area.

F. The drip dispersal system shall be programmed and maintained to operate within the maximum gallons per day capacity indicated in the following table.

G. The permittee shall maintain a daily log of total gallons discharged to each individual zone.

Hillendale STP Drip Dispersal System

Area

Zone

Total Area of

Zone

(Acres.)

Maximum

Daily Dose per

Zone (Gallons)

1 0.508 3,754

2 0.486 3,591

3 0.476 3,517

4 0.477 3,524

5 0.465 3,435

6 0.552 4,076

7 0.452 2,541

8 0.540 3,037

9 0.691 3,886

10 0.739 4,151

11 0.304 1,709

12 0.542 3,046

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VI. Right of Entry

Pursuant to Sections 5(b) and 30 5 of Pennsylvania’s Clean Stream Law, the permittee shall allow authorized representatives of Department of Environmental Protection upon the presentation of credentials and other documents as may be required by law:

1. To enter upon the permittee’s premises where a regulated facility or activity is located or conducted, or where records must be kept under the conditions of this permit.

2. To have access to and copy, at reasonable times, any records that must be kept under the conditions of this permit.

3. To inspect at reasonable times any facilities, equipment (including monitoring and control equipment), practices, or operations regulated or required under this permit.

4. To sample or monitor at reasonable times, for the purposes of assuring permit compliance or as otherwise authorized by the Clean Water Act or The Clean Streams Law, any substances or parameters at any location.

VII. Records Retention

Except for records of monitoring information required by this permit related to the permittee’s sludge use and disposal activities, which shall be retained for a period of at least five years, all records of monitoring activities and results (including all original strip chart recordings for continuous monitoring instrumentation and calibration and maintenance records), copies of all reports required by this permit, and records of all data used to complete the application for this permit shall be retained by the permittee for three years from the date of the sample measurement, report, or application. The three-year period shall be extended as requested by DEP or the EPA Regional Administrator.

VIII. Recording of Results

For each measurement or sample taken pursuant to the requirements of this permit, the permittee shall record the following information:

a. The exact place, date, and time of sampling or measurements.

b. The person(s) who performed the sampling or measurements.

c.