3-1-26-4-63-5 Contract Drawings.pdf

PDF 8 MB Posted May 26, 2026

Attached to: Harford Waste Disposal Center Landfill Gas Extraction Well and Condensate Drilling and Installation - MBE 5%
Solicitation number: 1-26-4-63-5
Issued by: Harford County, Maryland

About this file

Written by GovTribe AI · May 28, 2026

Summary

This is a set of construction drawings for the Harford Waste Disposal Center Landfill Gas Expansion project located at 3241 Scarboro Road, Street, Maryland 21154, prepared by EA Engineering, Science, and Technology, Inc. for the Harford County Department of Public Works and Maryland Environmental Service. The project scope includes the installation of six condensate drains, four caisson wells, and twelve landfill gas extraction wells at existing Cells N1 and N2 at interim cell conditions to maintain compliance with new state regulations. The drawings depict both interim condition installations and final condition installations (marked as "not in contract"), with detailed specifications for well depths, piping configurations, wellhead assemblies, and collection system layouts. The interim condition work requires installation of traditional and caisson-type extraction wells with depths varying from approximately 19 to 64 feet, utilizing 6-inch HDPE SDR17 perforated pipe for extraction and 4-inch to 8-inch diameter HDPE piping for gas collection headers and laterals. The county maintains the option to install landfill gas header and lateral collection piping at grade rather than buried to facilitate future maintenance and operations.

The construction drawings establish specific technical requirements for all materials, including HDPE pipe specifications (SDR 17 rating, 3408 type resin, heat-fusion jointing), valve specifications (Type 57 butterfly valves by Asahi/America), and wellhead assemblies (QED Environmental Systems Model ORP215 quick-change orifice plate design rated for 0-50 SCFM flow). The contractor is responsible for surveying existing grade conditions, staking well locations, obtaining all required permits except where noted, maintaining site operations within established hours, and providing as-built documentation within 30 days of completion. Work must conform to the MDE Refuse Permit No. 2022-WMF-0570, coordinate with existing landfill operations to maintain access and prevent interference, and comply with all applicable OSHA regulations and Harford County Department of Public Works standard specifications. The design includes provisions for future well extension during subsequent filling operations and potential well abandonment as directed by the county.

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Other files

File	Type	Posted
2-1-26-4-63-5 Solicitation Documents.pdf	PDF	May 26, 2026
1-1-26-4-63-5 Bidding Documents.pdf	PDF	May 26, 2026

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VICINITY MAP

SCALE: 1" = 2 MILES

SITE LOCATION MAP

SCALE: 1" = 2,000'

CELL N1

SCARBORO R

SCALE AS SHOWN

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A, S

PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

C O

R U

O N

EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

G-001

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

HARFORD WASTE DISPOSAL CENTER

LANDFILL GAS EXPANSION DESIGN

HARFORD COUNTY

3241 SCARBORO ROAD - STREET, MARYLAND 21154

SHEET LIST

SHEET

NO. DRAWING NO. DRAWING TITLE

1 G-001 TITLE SHEET

2 G-002 GENERAL NOTES & LEGEND

3 C-101 EXISTING CONDITIONS PLAN

4 C-102 PROPOSED LFG EXTRACTION WELL LAYOUT INTERIM CONDITION

5 C-103 PROPOSED LFG EXTRACTION WELL LAYOUT FINAL CONDITION

- NOT IN CONTRACT

6 C-501 LFG EXTRACTION WELL DETAILS INTERIM CONDITION

7 C-502 LFG EXTRACTION WELL DETAILS INTERIM CONDITION

8 C-503 LFG EXTRACTION WELL DETAILS FINAL CONDITION - NOT IN CONTRACT

9 C-504 LFG EXTRACTION WELL DETAILS FINAL CONDITION - NOT IN CONTRACT

10 C-505 LFG EXTRACTION WELL DETAILS FINAL CONDITION - NOT IN CONTRACT

ENGINEER'S CERTIFICATION

I HEREBY CERTIFY THAT THIS PLAN HAS BEEN PREPARED BY ME, OR

UNDER MY SUPERVISION, AND MEETS THE MINIMUM STANDARDS OF THE

HARFORD COUNTY DEPARTMENT OF PUBLIC WORKS AND/OR THE UNITED

STATES DEPARTMENT OF AGRICULTURE, SOIL CONSERVATION SERVICE,

AND/OR THE MARYLAND DEPARTMENT OF THE ENVIRONMENT, WATER

MANAGEMENT ADMINISTRATION.

SIGNED:

PRINT NAME: Laura Jo Bertrand Oakes

DATE:

P.E. NO.: 36798

DEVELOPER'S/LANDOWNER'S CERTIFICATION

I/WE HEREBY CERTIFY THAT ALL PROPOSED WORK SHOWN ON THESE

CONSTRUCTION DRAWING(S) WILL BE ACCOMPLISHED PURSUANT TO

THESE PLANS. I/WE ALSO UNDERSTAND THAT IS IS MY/OUR

RESPONSIBILITY TO HAVE THE CONSTRUCTION SUPERVISED AND

CERTIFIED, INCLUDING THE SUBMITTAL OF "AS-BUILT" PLANS WITHIN 30

DAYS OF COMPLETION, BY A REGISTERED PROFESSIONAL ENGINEER.

SIGNED:

PRINT NAME:

DATE:

AS-BUILT CERTIFICATION

I HEREBY CERTIFY THAT THE FACILITY SHOWN ON THIS PLAN WAS

CONSTRUCTED AS SHOWN ON THE "AS-BUILT" PLANS AND MEETS THE

APPROVED PLAN SPECIFICATIONS.

SIGNED:

PRINT NAME:

DATE:

P.E. NO.:

CERTIFY MEANS TO STATE OR DECLARE A PROFESSIONAL OPINION

BASED UPON ON-SITE INSPECTIONS AND MATERIAL TESTS WHICH

ARE CONDUCTED DURING CONSTRUCTION. THE ON-SITE

INSPECTIONS AND MATERIAL TESTS ARE THOSE INSPECTIONS AND

TESTS DEEMED SUFFICIENT AND APPROPRIATE BY COMMONLY

ACCEPTED ENGINEERING STANDARDS. CERTIFY DOES NOT MEAN

OR IMPLY A GUARANTEE BY THE ENGINEER NOR DOES AN

ENGINEER'S CERTIFICATION RELIEVE ANY OTHER PARTY FROM

MEETING REQUIREMENTS IMPOSED BY CONTRACT, EMPLOYMENT,

OR OTHER MEANS, INCLUDING MEETING COMMONLY ACCEPTED

INDUSTRY PRACTICES.

DESCRIPTION OF WORK

THIS DESCRIPTION OF WORK IS INTENDED TO ASSIST THE

CONTRACTOR IN UNDERSTANDING THE BASIC REQUIREMENTS OF THE

CONTRACT. THE DESCRIPTION OF WORK IS NOT INTENDED TO DEFINE

THE COMPLETE REQUIREMENTS OF THE CONTRACT. A COMPLETE

REVIEW OF THE CONTRACT DRAWINGS IS REQUIRED TO FULLY

UNDERSTAND ALL CONTRACT REQUIREMENTS. THE WORK INCLUDES

INSTALLATION OF SIX (6) CONDENSATE DRAINS, FOUR (4) CASSION

WELLS, AND TWELVE (12) LANDFILL GAS EXTRACTION WELLS AT THE

EXISTING CELLS N1 AND N2 ELEVATIONS (INTERIM CELL CONDITION,

NOT FINAL PERMITTED GRADE) TO REMAIN IN COMPLIANCE WITH NEW

STATE REGULATIONS. FOR EASE OF INSTALLATION AND MAINTENANCE,

THE COUNTY MAY ELECT TO INSTALL LANDFILL GAS HEADER AND

LATERAL COLLECTION PIPING AT GRADE.

TITLE SHEET

CELL N2

CELLS A-J

DUBLIN RD

CONOWINGO RD

(RTE 1)

SITE

5/4/2026

Sharmin Sultana Stamp jtschoenberger Text Box Jeffrey T. Schoenberger jtschoenberger Text Box 5/6/2026

SCALE AS SHOWN

H : Q

:\P R

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C L

N \C

R O

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O N

W D

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-0

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A, S

PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

C O

R U

O N

EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

G-002

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

SITE ADDRESS

3241 SCARBORO ROAD

STREET, MARYLAND 21154

OWNER

HARFORD COUNTY DEPARTMENT OF PUBLIC WORKS

212 S. BOND STREET

BEL AIR, MARYLAND 21014

CONTACT: JEFFERY T. SCHOENBERGER, P.E.

410-638-3285

OPERATOR

MARYLAND ENVIRONMENTAL SERVICE

3135 SCARBORO ROAD

STREET, MARYLAND 21154

CONTACT: JEFFREY R. LANDIS, P.E.

410-638-3018

GENERAL NOTES:

1. EXISTING CONTOURS DEPICTING EXISTING CONDITIONS ARE BASED ON AN AERIAL SURVEY

CONDUCTED BY THE BAI GROUP, LLC. (BAI) ON 20 DECEMBER 2023. EXISTING CONTOURS

REPRESENT EXISTING CELLS N1 AND N2 ELEVATIONS (INTERIM CELL CONDITION, NOT

PERMITTED FINAL GRADE). THE COUNTY MAY PURSUE ADDITIONAL FILLING IN THE FUTURE TO

FINAL CELL N1/N2 CLOSURE GRADES IN ACCORDANCE WITH THE CELL N2 CONSTRUCTION AND

CELLS A-J CLOSURE DESIGN BY EA ENGINEERING (MARCH 2014).

2. CELL N1 LINER GRADES USED FOR EXTRACTION WELL DESIGN DEPTHS BASED ON AS-BUILT

LOW PERMEABILITY SOIL LAYER SURVEY CONDUCTED BY MORRIS AND RITCHIE ASSOCIATES,

INC. (MRA) (CONTOURS NOT SHOWN).

3. CELL N2 LINER GRADES USED FOR EXTRACTION WELL DESIGN DEPTHS BASED ON AS-BUILT

LOW PERMEABILITY SOIL LAYER SURVEY CONDUCTED BY MORRIS AND RITCHIE ASSOCIATES,

INC. (MRA) IN 2015 (CONTOURS NOT SHOWN).

4. FINAL CELL N1/N2 CLOSURE GRADES PER THE CELL N2 CONSTRUCTION AND CELLS A-J

CLOSURE DESIGN BY EA ENGINEERING (MARCH 2014), AS APPROVED AND PERMITTED BY MDE

IN 2014 (CONTOURS SHOWN ON FINAL CONDITION).

5. FOR CELL N1, ADDITIONAL SURVEY FOR LINER GRADES BASED ON AS-BUILT LINER SURVEY

CONDUCTED BY MORRIS AND RITCHIE ASSOCIATES, INC. (MRA) IN 2013 WAS UTILIZED IN

EXTRACTION WELL PLACEMENT AND DESIGN (CONTOURS NOT SHOWN).

6. ALL WORK ON THIS PROJECT SHALL BE IN ACCORDANCE WITH THE REQUIREMENTS SET

FORTH BY THE MOST RECENT HARFORD COUNTY DEPARTMENT OF PUBLIC WORKS STANDARD

SPECIFICATIONS FOR CONSTRUCTION AND MATERIALS, UNLESS SPECIFIED OTHERWISE.

7. ALL CONSTRUCTION OPERATIONS SHALL BE ACCOMPLISHED IN ACCORDANCE WITH

APPLICABLE STATE AND LOCAL STATUTES AND U.S. OCCUPATIONAL SAFETY AND HEALTH

ADMINISTRATION (OSHA) REGULATIONS. COPIES OF OSHA'S STANDARDS MAY BE PURCHASED

FROM THE U.S. GOVERNMENT PRINTING OFFICE. THE CONTRACTOR ALONE SHALL BE

RESPONSIBLE FOR THE EXECUTION OF THE WORK IN ACCORDANCE WITH ALL APPLICABLE

HEALTH AND SAFETY REQUIREMENTS. THE OWNER NOR THE ENGINEER SHALL BE

RESPONSIBLE FOR INSPECTION OF THE WORK OR THE METHODS OF CONSTRUCTION FOR

COMPLIANCE WITH THESE REQUIREMENTS.

8. THE 100-YEAR FLOOD PLAIN DOES NOT EXIST WITHIN THE VICINITY OF THE PROPOSED WORK.

9. HORIZONTAL DATUM: NAD83 (MD STATE PLANE); VERTICAL DATUM: NAVD88.

10. CONTRACTOR SHALL BE RESPONSIBLE FOR SURVEY OF EXISTING GRADE AND STAKEOUT OF

PROPOSED EXTRACTION WELL LOCATIONS PRIOR TO WELL INSTALLATION. CONTRACTOR

SHALL FIELD VERIFY ALL DIMENSIONS AND CONDITIONS BEFORE COMMENCING WORK. IT IS

THE CONTRACTOR'S RESPONSIBILITY TO REPORT ANY DISCREPANCIES TO ENGINEER AND

OWNER IN A TIMELY MANNER. FAILURE TO CONDUCT SITE INVESTIGATION ADVANCE OF WORK

OR VERIFY DIMENSIONS SHALL NOT BE CAUSE FOR ADDITIONAL COSTS TO THE OWNER.

11. PIPE ELEVATIONS ARE INVERT ELEVATIONS UNLESS OTHERWISE NOTED.

12. CONTRACTOR SHALL BE RESPONSIBLE FOR ALL PERMITS WHICH ARE REQUIRED TO PERFORM

THE WORK PRIOR TO CONSTRUCTION, EXCEPT AS NOTED OTHERWISE IN THE CONTRACT

DOCUMENTS.

13. CONTRACTOR SHALL CONFORM TO THE ISSUED MDE REFUSE PERMIT NO. 2022-WMF-0570 FOR

THE HARFORD WASTE DISPOSAL CENTER (HWDC).

14. CONTRACTOR SHALL CONFINE ALL WORK, INCLUDING ACCESS, STAGING, AND EQUIPMENT

STORAGE TO THE BOUNDARIES SHOWN HEREIN.

15. CONTRACTOR SHALL CONDUCT CONSTRUCTION DURING REGULAR OPERATING HOURS FOR

THE HWDC. CONTRACTOR AND CONTRACTOR'S EMPLOYEES SHALL LEAVE THE SITE

IMMEDIATELY AT THE END OF THEIR SHIFT. IF PUMPS, GENERATORS, ETC. NEED TO BE RUN

AT NIGHT, NOISE ATTENUATION WILL BE REQUIRED.

16. CONTRACTOR SHALL CONDUCT EQUIPMENT MAINTENANCE ONLY WITHIN THE

AFOREMENTIONED PERMITTED HOURS OF CONSTRUCTION. CONTRACTOR SHALL

IMMEDIATELY CLEAN UP ANY SPILLS AND CONTAMINATED SOIL, STONE, ETC. AND SHALL BE

IMMEDIATELY COLLECTED AND DISPOSED OF BY THE CONTRACTOR (WITH MANIFESTS).

CONTRACTOR AND CONTRACTOR'S EMPLOYEES SHALL NOT WORK ON PERSONAL VEHICLES

ON SITE.

17. CONTRACTOR SHALL RECYCLE WASTE MATERIAL TO THE MAXIMUM EXTENT PRACTICABLE.

18. THE CONTRACTOR SHALL CONTACT MISS UTILITY AT 1-800-257-7777 AT LEAST 48 HOURS PRIOR

TO DIGGING.

19. APPROXIMATE LOCATION OF EXISTING UTILITIES ARE SHOWN. THE CONTRACTOR SHALL TAKE

ALL NECESSARY PRECAUTIONS TO PROTECT EXISTING UTILITIES AND MAINTAIN

UNINTERRUPTED SERVICE AT ALL TIMES. IF UTILITIES ARE ENCOUNTERED, THE CONTRACTOR

SHALL IMMEDIATELY INFORM THE OWNER AND REPAIR THE UTILITY AT THE CONTRACTOR'S

EXPENSE PRIOR TO CONTINUING WORK.

20. BENCHMARK MONUMENTS AND/OR PROPERTY MARKERS SHALL BE PROTECTED AT ALL TIMES

AND SHALL NOT BE DISTURBED BY CONSTRUCTION ACTIVITIES UNLESS OTHERWISE WAIVED

BY THE COUNTY IN WRITING. THE CONTRACTOR SHALL BE RESPONSIBLE FOR REPLACEMENT

OF BENCHMARK MONUMENTS AND/OR PROPERTY MARKERS DAMAGED AS A RESULT OF THE

CONTRACTOR'S ACTIVITIES.

21. FAILURE TO MENTION SPECIFICALLY ANY WORK WHICH WOULD NORMALLY BE REQUIRED TO

COMPLETE THE PROJECT SHALL NOT RELIEVE THE CONTRACTOR FROM PERFORMING SUCH

WORK.

22. CONTRACTOR SHALL NOT INTERFERE WITH LANDFILL OPERATIONS. ACCESS TO CELL N1/N2, CELLS A-J, AND LEACHATE MANAGEMENT FACILITIES SHALL BE MAINTAINED DURING ALL

FACILITY OPERATING HOURS.

23. CONTRACTOR SHALL PROVIDE AS-BUILT SURVEY OF INSTALLED GAS WELLS AND "RED LINE"

CONTRACT DRAWINGS NOTING CHANGES AS AS-BUILT CONDITIONS.

GENERAL NOTES & LEGEND

LEGEND

DESCRIPTION EXISTING PROPOSED

EXTRACTION WELL

LANDFILL GAS HEADER

LANDFILL GAS LATERAL

MAJOR CONTOUR

MINOR CONTOUR

ANCHOR TRENCH

LANDFILL GAS VERTICAL TEE

ISOLATION VALVE

CONDENSATE DRAINS

EW-N1-X

LFG LFG LFG LFG

LANDFILL GAS NOTES AND SPECIFICATIONS:

1. INSTALL LANDFILL GAS WELLS PER CONTRACT DRAWINGS.

2. LANDFILL GAS EXTRACTION WELLS MAY NEED TO BE EXTENDED VERTICALLY DURING FUTURE FILLING

OPERATIONS OR ABANDONED, AS DIRECTED BY THE COUNTY.

3. CONTRACTOR MAY MAKE MINOR ADJUSTMENTS TO LANDFILL GAS HEADER ALIGNMENT PROVIDED A

MINIMUM 3% SLOPE IS MAINTAINED ALONG THE ENTIRE LENGTH OF THE PIPE ALIGNMENT.

CONTRACTOR MAY FIELD ADJUST NUMBERS, PLACEMENT, AND ANGLE OF BENDS AS LONG AS

MINIMUM SLOPE, POSITIVE DRAINAGE OF COLLECTION LOOPS, WELL PLACEMENT, AND DEPTH OF

COVER IS MAINTAINED.

4. LANDFILL GAS COLLECTION SYSTEM WELLHEADS SHALL BE A QUICK-CHANGE ORIFICE PLATE DESIGN, MODEL ORP215 BY QED ENVIRONMENTAL SYSTEMS, INC., AND SHALL CONSIST OF WELL HEAD PIPING

AND FITTINGS, FLOW CONTROL VALVE, GAS TEMPERATURE GAUGE PORT, QUICK CONNECT GAS

SAMPLING, STATIC AND DIFFERENTIAL PORTS, REINFORCED FLEXIBLE HOSE CONNECTOR, AND DUST

CAP. ALL WELL HEAD PIPING AND FITTINGS SHALL BE SCHEDULE 80 PVC.

5. HDPE PIPE AND FITTINGS SHALL BE STANDARD DIMENSIONS RATING (SDR) 17 HDPE PIPE USING A 3408 TYPE RESIN, OR APPROVED EQUAL. PIPE SHALL BE EXTRUDED FROM A TYPE III, CLASS C, CATEGORY 5, GRADE P34 COMPOUND AS DESCRIBED IN ASTM D 1248. IT SHALL BE CLASSIFIED AS CELL 345434C

ACCORDING TO ASTM D 3350 AND HAVE THE MATERIAL DESIGNATION OF PE 3408.

6. HDPE PIPE SHALL BE JOINED BY HEAT FUSION TO PROVIDE A HOMOGENEOUS, SEALED AND LEAK

PROOF JOINT. PIPE SHALL BE JOINED FOLLOWING MANUFACTURER'S RECOMMENDATION.

POLYETHYLENE PIPE SHALL NOT BE SOLVENT SEALED.

7. PIPE FITTINGS SHALL BE ASTM D-2513-LATEST EDITION, BUTT FUSION MOLDED. FITTINGS SHALL BE

PRESSURE RATED TO MATCH THE SYSTEM PIPING TO WHICH THEY ARE FUSED.

8. FERNCO OR APPROVED FLEXIBLE MECHANICAL COUPLINGS FOR PIPE CONNECTIONS SHALL BE THE

STAINLESS STEEL TYPE SUITABLE FOR USE WITH HDPE PIPE.

9. VALVES SHALL BE TYPE 57 PROVIDED BY ASAHI/AMERICA. INC. OF MALDEN, MA OR APPROVED EQUAL.

LFG TYPE 57 COLLECTION SYSTEM VALVES SHOULD BE PVC BODY WITH POLYPROPYLENE DISCS, AND

NITRILE OR EPDM SEAT AND SEALS. VALVES AND OPERATORS SHALL BE SUITABLE FOR THE

EXPOSURE THEY ARE TO BE SUBJECTED TO, E.G., BURIED AND LANDFILL GAS. VALVES SHALL BE COMPLETE WITH NECESSARY OPERATORS, ACTUATORS, EXTENSION STEMS, FLOOR STANDS, WORM

AND GEAR OPERATORS, OPERATING NUTS, CHAINS, WRENCHES, AND OTHER ACCESSORIES OR

APPURTENANCES WHICH ARE REQUIRED FOR THE PROPER COMPLETION OF THE WORK.

10. OWNER MAY ELECT TO UTILIZE AT GRADE PIPING FOR LATERAL AND HEADER COLLECTION PIPING.

FLEXIBLE EXPANSION COUPLINGS, AS APPROVED BY THE ENGINEER, SHALL BE UTILIZED AT WELL CONNECTIONS AND CHANGES IN PIPE DIRECTION AND SHALL PROVIDE MINIMUM 50% CONTRACTION

AND 20% EXTENSION, OR GREATER IF RECOMMENDED BY PIPE MANUFACTURER.

11. IF PIPING IS INSTALLED AT GRADE, CONTRACTOR SHALL MARK PIPING IN A HIGH VISIBILITY PAINT AND PLACE CONES AT EACH LANDFILL GAS EXTRACTION WELL LOCATION. AT GRADE PIPING SHALL BE STAKED WITH #6 REBAR WITH RUBBER CAP DRIVEN 3' +/- INTO GROUND, OR APPROVED EQUAL.

EROSION AND SEDIMENT CONTROL NOTES:

1. DISTURBANCE IN AREA OF CELLS N1 AND N2 CONSTRUCTION ADDRESSED UNDER THE HWDC SITE OPERATIONS EROSION AND SEDIMENT CONTROL PLAN #59599 PREPARED BY EA ENGINEERING AND

APPROVED IN APRIL 2023.

2. THE CONTRACTOR SHALL PROTECT ALL POINTS OF CONSTRUCTION INGRESS AND EGRESS TO PREVENT

THE DEPOSITION OF MATERIALS OUTSIDE OF WORK AREAS AND ONTO PUBLIC ROADS.

3. WORK AREAS ARE TO BE KEPT FREE OF DEBRIS AT ALL TIMES.

SOIL SPECIFICATIONS:

1. GENERAL FILL SHALL HAVE A MAXIMUM DRY DENSITY OF AT LEAST 100 POUNDS PER CUBIC FOOT AS

DETERMINED BY AASHTO DESIGNATION T-180, METHOD D PROCEDURES AND SHALL BE FREE OF

EXCESS ORGANIC MATERIAL, BOULDERS, SHARP, ANGULAR STONES IN EXCESS OF 2 INCHES OR ROUNDED STONES IN EXCESS OF 3 INCHES. MATERIAL SHALL MEET ASTM D2487, CLASSIFICATION GM, SW, SP, SM.

2. GRANULAR FILL SHALL BE NO. 57 STONE. MATERIAL SHALL BE FREE OF LIMESTONE AND HAVE LESS

THAN 2% FINES.

3. LFG COLLECTION PIPE BEDDING MATERIAL SHALL BE GENERAL FILL, OR APPROVED EQUAL.

LFGL LFGL

EW-N1-X

NOT IN CONTRACT

Sharmin Sultana Stamp

305305

335335

310 310

315 315

320 320

41041

300300

290290 295 295

300 300

305310

310315

320325

325330

330335

0 42

420425 430435

445450

41542

X X

X X X X

X X

EL: 298.00

LFG

LFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFG

LFG

LFG LFG

LFG

LFG LFG LFG

LFG

LFGLFGLFGLFGLFGLFGLFGLFGLFGLFG

LFGLFGLFG

LFG

EW-N1-4

EW-N1-6

EW-N1-3

EW-N1-2

EW-N1-1

EW-N1-5

EW-N1-7

40541

325330

335340

ACCESS ROAD

LIMIT OF EX. CELL N1

ANCHOR TRENCH

EX. 12" DIA. LFG

HEADER PIPE

EX. LFG

VERTICAL TEE #4

EX. CONDENSATE DRAIN

(TYP. OF 3)

EX. 4" DIA. LFG

LATERAL PIPE (TYP.)

EX. LFG

EXTRACTION WELL

(TYP. OF 7)

EX. 6" DIA. LFG

HEADER PIPE (TYP.)

N: 720400

N: 719400

EX. 12" DIA. LFG

HEADER PIPE

EX. LFG

VERTICAL TEE #11

8" DIA. EX. LFG

HEADER PIPE (TYP.)

EX. LFG

VERTICAL TEE #13

EX. LFG

VERTICAL TEE #14

EX. LFG

VERTICAL TEE #15

EX. LFG

VERTICAL TEE #1

EX. LFG

VERTICAL TEE #2

EX. LFG

VERTICAL TEE #3

EX. LFG

VERTICAL TEE #5

EX. LFG

VERTICAL TEE #12

EX. LFG

VERTICAL TEE #10

EX. LFG

VERTICAL TEE #8

EX. LFG

VERTICAL TEE #7

EX. LFG

VERTICAL TEE #6

EX. LFG

VERTICAL TEE #9

GRAPHIC SCALE IN FEET

0 25 50 100

H : Q

:\P R

W D

C L

N \C

R O

D U

O N

W D

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G [C

-1

] S U

A, S

PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

C O

R U

O N

EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

C-101

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

EXISTING CONDITIONS PLAN

CELL N1

CELL N2

305305

335335

310 310

315 315

320 320

41041

300300

290290 295 295

300 300

305310

310315

320325

325330

330335

0 42

420425 430435

445450

41542

X X

X X X X

X X

EL: 298.00

LFG

LFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFGLFG

LFG

LFG LFG

LFG

LFG LFG LFG

LFG

LFGLFGLFGLFGLFGLFGLFGLFGLFGLFG

LFGLFGLFG

LFG

EW-N1-4

EW-N1-6

EW-N1-3

EW-N1-2

EW-N1-1

EW-N1-5

EW-N1-7

40541

325330

335340

ACCESS ROAD

LIMIT OF EX. CELL N1

ANCHOR TRENCH

EX. 12" DIA. LFG

HEADER PIPE

EX. LFG

VERTICAL TEE #4

EX. CONDENSATE DRAIN

(TYP. OF 3)

EX. 4" DIA. LFG

LATERAL PIPE (TYP.)

EX. LFG

EXTRACTION WELL

(TYP. OF 7)

EX. 6" DIA. LFG

HEADER PIPE (TYP.)

N: 720400

N: 719400

EX. 12" DIA. LFG

HEADER PIPE

EX. LFG

VERTICAL TEE #11

8" DIA. EX. LFG

HEADER PIPE (TYP.)

EX. LFG

VERTICAL TEE #13

EX. LFG

VERTICAL TEE #14

EX. LFG

VERTICAL TEE #15

EX. LFG

VERTICAL TEE #1

EX. LFG

VERTICAL TEE #2

EX. LFG

VERTICAL TEE #3

EX. LFG

VERTICAL TEE #5

EX. LFG

VERTICAL TEE #12

EX. LFG

VERTICAL TEE #10

EX. LFG

VERTICAL TEE #8

EX. LFG

VERTICAL TEE #7

EX. LFG

VERTICAL TEE #6

EX. LFG

VERTICAL TEE #9

LFG

LFG LFG

LFGL

LFG

G L

LFGL

G L

G LFG

LFG

LFGL

EW-N2-3

EW-N2-4

EW-N2-11

EW-N1-8

EW-N1-9

EW-N1-10

EW-N1-11

EW-N1-12

EW-N1-13

EW-N1-14

EW-N1-15

EW-N1-16

EW-N1-17

EW-N2-6

EW-N2-5

EW-N1-18

LFGL

LFG

CD-N1-4

CD-N1-3

CD-N1-2

CD-N1-1

CD-N1-5

CD-N1-6

TIE-IN WITH EX. LFG

VERTICAL TEE #10

EX. LFG

EXTRACTION WELL

(TYP. OF 7)

TIE-IN WITH EX. LFG

VERTICAL TEE #11

TIE-IN WITH EX. LFG

VERTICAL TEE #8

TIE-IN WITH EX. LFG

VERTICAL TEE #12

TIE-IN WITH EX. LFG

VERTICAL TEE #13

TIE-IN WITH EX. LFG

VERTICAL TEE #1

TIE-IN WITH EX. LFG

VERTICAL TEE #14

TIE-IN WITH EX. LFG

VERTICAL TEE #9

6" DIA LFG HEADER

PIPE (TYP.)

4" DIA LFG LATERAL

PIPE (TYP.)

EX. CONDENSATE DRAIN

(TYP. OF 3)

CELL N1

GRAPHIC SCALE IN FEET

0 25 50 100

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A, S

PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

C O

R U

O N

EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

C-102

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

PROPOSED LFG EXTRACTION

WELL LAYOUT

INTERIM CONDITION

CELL N2

305305

335335

310 310

315 315

320 320

41041

300300

290290 295 295

300 300

305310

310315

320325

325330

330335

0 42

420425 430435

445450

41542

X X

X X X X

X X

EL: 298.00

40541

325330

335340

ACCESS ROAD

LIMIT OF EX. CELL N1

ANCHOR TRENCH

EX. 12" DIA. LFG

HEADER PIPE

EX. LFG

VERTICAL TEE #4

N: 720400

N: 719400

EX. 12" DIA. LFG

HEADER PIPE

EX. LFG

VERTICAL TEE #11

8" DIA. EX. LFG

HEADER PIPE (TYP.)

EX. LFG

VERTICAL TEE #13

EX. LFG

VERTICAL TEE #14

EX. LFG

VERTICAL TEE #15

EX. LFG

VERTICAL TEE #1

EX. LFG

VERTICAL TEE #2

EX. LFG

VERTICAL TEE #3

EX. LFG

VERTICAL TEE #5

EX. LFG

VERTICAL TEE #12

EX. LFG

VERTICAL TEE #10

EX. LFG

VERTICAL TEE #8

EX. LFG

VERTICAL TEE #7

EX. LFG

VERTICAL TEE #6

EX. LFG

VERTICAL TEE #9

EW-N2-1

EW-N2-2

EW-N2-3

EW-N2-4

EW-N2-12

EW-N2-11

EW-N2-10

EW-N2-9

EW-N1-8

EW-N1-9

EW-N1-10

EW-N1-11

EW-N1-12

EW-N1-13

EW-N1-14

EW-N1-15

EW-N1-16

EW-N1-17

EW-N2-8

EW-N2-7

EW-N2-6

EW-N2-5

EW-N1-18

LFG

LFGL

LFG

LFGL

LFG

GLLFG

LFG

LFGL

G L

LFG

LFGL

LFG

LFGL

LFG

EW-N1-1

EW-N1-2

EW-N1-3

EW-N1-4

EW-N1-5

EW-N1-6

EW-N1-7

LFGL

LFG

LFGL

CD-9

440440

4" DIA. LFG LATERAL

PIPE (TYP.)

TIE-IN WITH EX. LFG

VERTICAL TEE #10

EX. 4" DIA. LFG

LATERAL PIPE (TYP.)

6" DIA. LFG

HEADER PIPE (TYP.)

4" DIA. LFG LATERAL

PIPE (TYP.)

TIE-IN WITH EX. LFG

VERTICAL TEE #11

4" DIA. LFG LATERAL

PIPE (TYP.)

BENCH CROSSING

SEE DETAIL

SHEET C-504

BENCH CROSSING

SEE DETAIL SHEET C-504

BENCH CROSSING

SEE DETAIL SHEET C-504

BENCH CROSSING

SEE DETAIL SHEET C-504

BENCH CROSSING

SEE DETAIL SHEET C-504

BENCH CROSSING

SEE DETAIL SHEET C-504

4" DIA. LFG LATERAL

PIPE (TYP.)

4" DIA. LFG LATERAL

PIPE (TYP.)

BENCH CROSSING

SEE DETAIL SHEET C-504

ISOLATION VALVE

(TYP.)

ISOLATION VALVE

(TYP.)

TIE-IN WITH EX. LFG

VERTICAL TEE #8

6" DIA. LFG HEADER

PIPE (TYP.)

TIE-IN WITH EX. LFG

VERTICAL TEE #12

TIE-IN WITH EX. LFG

VERTICAL TEE #13

BENCH CROSSING

SEE DETAIL SHEET C-504

TIE-IN WITH EX. LFG

VERTICAL TEE #1

TIE-IN WITH EX. LFG

VERTICAL TEE #2

TIE-IN WITH EX. LFG

VERTICAL TEE #3

BENCH CROSSING

SEE DETAIL SHEET C-504

BENCH CROSSING

SEE DETAIL SHEET C-504

TIE-IN WITH EX. LFG

VERTICAL TEE #14

TIE-IN WITH EX. LFG

VERTICAL TEE #5

TIE-IN WITH EX. LFG

VERTICAL TEE #6

ISOLATION VALVE

(TYP.)

ISOLATION VALVE

(TYP.)

TIE-IN WITH EX. LFG

VERTICAL TEE #9

BENCH CROSSING

SEE DETAIL SHEET C-504

GABION SWALE

(TYP.)

RIPRAP SWALES

GABION SWALE

(TYP.)

BENCH CROSSING

SEE DETAIL SHEET C-504

CELL N1

GRAPHIC SCALE IN FEET

0 25 50 100

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O N

W D

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D W

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A, S

PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

C O

R U

O N

EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

C-103

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

PROPOSED LFG EXTRACTION

WELL LAYOUT

FINAL CONDITION

CELL N2

FOR INFORMATION ONLY - NOT IN CONTRACT

H : Q

:\P R

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C L

N \C

R O

D U

O N

W D

C L

D W

G [C

-5

] S U

A, S

PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

C O

R U

O N

EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

C-501

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

LFG EXTRACTION WELL

DETAILS

INTERIM CONDITION

WASTE

800-624-2026 www.qedenv.com

SLOPE

800-624-2026 www.qedenv.com

ABOVEGROUND

PIPING TO HEADER

FROM EXTRACTION WELL

ELEVATION

TRADITIONAL LANDFILL GAS EXTRACTION WELL

(INTERIM CONDITION)

NOT TO SCALE

LANDFILL GAS WELLHEAD

(INTERIM CONDITION)

NOT TO SCALE

3' DIA.

15'

DEPTH VARIES

REFER TO TABLE

4" 4' ±

30"

FEMALE QUICK CONNECT

MANUFACTURED BY McMASTER-CARR

PART # 5012K31 OR APPROVED EQUAL

2" X 4" FLEXIBLE

COUPLING

4" DIA. PIPE

2" SCH. 80 PVC PIPE

GWC62 WELL CAP 6" WELL x

2" GAS WELLHEAD

2" ORIFICE PLATE ASSEMBLY

2" PRECISION CONTROL VALVE2" DIA. FLEXIBLE HOSE

2" SCH. 80 PVC PIPE

6" Ø PIPE

6" FLEXIBLE COUPLING

1/4" LABLOCK

LANDFILL GAS WELLHEAD

(SEE DETAIL THIS SHEET)

GRAVEL PAD

(SEE DETAIL THIS SHEET)

GENERAL FILL

2' BENTONITE PLUG

6" HDPE SDR17 PERFORATED PIPE

PERFORATIONS SHALL BE 1/2" DIA. HOLES

SPACED 90° APART AROUND PERIMETER

EVERY 6" FOR ENTIRE PERFORATED LENGTH.

GEOCOMPOSITE ISOLATION RING

LENGTH VARIES

(REFER TO TABLE)

GRANULAR FILL

HDPE END CAP

BOTTOM OF WELL

LANDFILL GAS HEADER ISOLATION VALVE

(INTERIM CONDITION)

NOT TO SCALE

GRAVEL PAD

(SEE DETAIL

THIS SHEET)

3'3'

EXISTING CONDITIONS

2' MIN.

UTILITY

MARKER (TYP)

GAS SAMPLE

PORT AND FEMALE

END TO ACCEPT

TEST PORT, TYP.

COVER

GRAVEL PAD

(SEE DETAIL

THIS SHEET)

TWO PIECE REMOVABLE STEM 1/4" S.S. TUBING, TYP.

FLOW

MIN.

DISTANCE TO

ALLOW FOR

BUTT FUSION

6" DIA. LFG

HEADER PIPE

HDPE VALVE STEM

AND SAMPLING TUBE

SLEEVE

TAP

6" BUTTERFLY VALVE

PROVIDE PIPE BEDDING

FOR SUPPORT

MIN. 12"

BUTT WELDED

FLANGE, TYP.

EX. CONDITIONS

INSTALLATION NOTES:

1. WELLHEAD CASING DRILLING DEPTH TO BE DETERMINED BASED ON LFG EXTRACTION WELL SCHEDULE, FIELD CONDITIONS AND THE ENGINEER'S DIRECTION.

2. WELLHEAD AND FLOW MEASUREMENT TUBE ASSEMBLY SHALL BE COMPATIBLE WITH CES-LANDTEC

GEM-500, GEM-2000, AND GEM-5000 (LANDFILL GAS INSTRUMENTS).

3. 2" WELLHEAD SHALL BE RATED FOR A FLOW RANGE OF 0-50 SCFM.

4. FOR FLEXIBLE CONNECTIONS TO PIPE USE ONLY STAINLESS STEEL V-BAND CLAMPS.

5. GECOMPOSITE ISOLATION RING SHALL FIT SNUG TO EXTRACTION WELL TO PROVIDE SEPARATION BETWEEN

STONE AND BENTONITE PLUG.

NOTES:

1. BURIED VALVES SHALL USE STAINLESS STEEL HARDWARE WITH ANTISEIZE COMPOUND AND BE

WRAPPED IN POLYETHYLENE SHEETING PRIOR TO BACKFILLING.

2. VALVES SHALL HAVE PERMANENT (NOT PAINTED) OPEN/CLOSE POSITION INDICATOR ON VALVE HANDLE

3. ALL VALVES SHALL BE CLEARLY MARKED WITH VALVE ID.

4. IF NOT BURIED, AN OPERATING WHEEL MAY BE PLACED IN LIEU OF STEM, AS APPROVED BY THE

ENGINEER.

INSTALLATION NOTES:

1. DRAWING SHOWS TYPICAL CONNECTION TO A 90° ELBOW.

ACTUAL CONNECTION MAY BE TO A TEE OR COUPLING.

2. WARNING: DO NOT CUT THE FLOW MEASUREMENT TUBE

ASSEMBLY. FAILURE TO HEED THIS WARNING WILL RESULT

IN A DAMAGED OR INOPERATIVE WELLHEAD AND VOID THE

WARRANTY.

3. ALLOW SUFFICIENT SLACK IN FLEX HOSE FOR PIPING

EXPANSION AND CONTRACTION. AN EXTRA 6-12" IS

RECOMMENDED.

4. SUPPLY BRASS ID TAG WITH NUMBER AT EACH WELLHEAD.

5. REFER TO QED WELLHEAD INSTALLATION AND OPERATION

MANUAL. READ INSTRUCTIONS THOROUGHLY BEFORE

ATTEMPTING ASSEMBLY AND INSTALLATION OF WELLHEAD

ON WELL CASING.

6. 4" DIA. PIPE TO TERMINATE ABOVE GRADE IF LATERAL

PIPING IS NOT BURIED.

EX. CONDITIONS

3' MIN.

EX. 8" FUSION WELDED CAP

EX. CONDITIONS

EX. 12" x 8" HDPE

REDUCING TEE

EX. 8" DR 17 HDPE

GAS HEADER VERTICAL TEE

(INTERIM/FINAL CONDITION)

NOT TO SCALE

NOTES:

1. PROVIDE A MINIMUM OF 1 FT OF COVER OVER PROPOSED LANDFILL GAS HEADER PIPE.

2. INVERT ELEVATION FOR EX. LFG HEADER BASED ON MALCOLM PIRNIE DESIGN

DRAWINGS (MALCOLM PIRNIE 2011).

APPROX. LOCATION

OF EX. LINER TRENCH

PROP. 6" DIA. LFG HEADER PIPE

OR 4" DIA. LFG LATERAL PIPE

APPROX. 5'

EX. 12" DIA. LFG

HEADER PIPE

PROP. 8" x 6" HDPE TEE OR 8" x 4" HDPE TEE

HEADER PIPE TO

COLLECTION

PIPING

FEMALE QUICK CONNECTS

MANUFACTURED BY

McMASTER-CARR

PART # 5012K31 OR

APPROVED EQUAL

PIPING TRENCH DETAIL

(INTERIM CONDITION)

NOT TO SCALE

D/2D/2

2' MIN.

DETECTOR TAPE

4" OR 6" DIA. SDR 17 HDPE

LFG COLLECTION

EX. CONDITIONS

SOIL BEDDING

NOTE:

1. THE LFG COLLECTION PIPE MAY BE PLACED ABOVE GRADE WITH VISIBLE MARKINGS.

GENERAL BACKFILL

(TYP.)

EMBED 6" MIN. (TYP.)

EXISTING 12-IN LFG HEADER VERTICAL TEE SCHEDULE

TEE ID NORTHING EASTING

TOP OF CAP

ELEVATION

(FT)

INVERT

ELEVATION

(FT)

1 720072.64 1510379.77 418.85 412.74

2 720193.28 1510468.36 420.14 414.27

3 720316.18 1510558.38 421.09 415.78

4 720306.41 1510753.75 421.15 415.38

5 720240.50 1511038.25 403.46 399.74

6 720325.91 1511307.08 379.92 375.92

7 720129.94 1511503.88 353.74 349.94

8 719884.61 1511680.57 336.51 332.78

9 719528.66 1511743.55 302.86 299.10

10 719438.56 1511625.64 300.82 296.14

11 719388.78 1511104.34 300.78 296.75

12 719373.88 1510846.09 328.52 324.13

13 719562.06 1510622.09 366.32 361.38

14 719766.87 1510398.75 405.38 399.49

15 719941.15 1510317.13 410.62 410.62

NOTE:

1. EXISTING VERTICAL TEE LOCATIONS AND TOP OF CAP ELEVATIONS BASED ON MES

SURVEY PERFORMED JUNE 2024.

2. INVERT ELEVATIONS WERE BASED ON CONSTRUCTION OF CELL N1 RECORD

DRAWINGS PREPARED BY MALCOM PIRNIE IN DECEMBER 2009.

INTERIM CONDITION TRADITIONAL LANDFILL GAS EXTRACTION WELL SCHEDULE

WELL ID

PROPOSED LOCATION EXISTING

ELEVATION

(FT)

APPROX.

LINER

ELEVATION

(FT)

APPROX. WELL

DEPTH (FT)

FROM

EXISTING

ELEVATION

APPROX.

PERFORATED

PIPE LENGTH

(FT)

APPROX.

WELL BOTTOM

ELEVATION

(FT)NORTHING EASTING

EW-N1-8 720059.82 1510530.10 447.6 391.27 46 31 401.6

EW-N1-9 719911.44 1510684.12 444.2 370.21 64 49 380.2

EW-N1-11 719906.97 1510447.80 436.9 389.06 38 23 398.9

EW-N1-12 719746.01 1510612.23 413.2 366.32 36 21 377.2

EW-N1-13 719743.35 1510813.96 419.6 349.60 58 43 361.6

EW-N1-14 719606.27 1510780.34 387.1 344.81 32 17 355.1

EW-N1-15 719702.13 1511036.02 375.5 330.02 35 20 340.5

EW-N1-16 719514.83 1510886.35 357.1 323.95 23 8 334.1

EW-N1-17 719521.74 1511213.22 328.9 299.66 19 4 309.9

EW-N1-18 719535.52 1511055.66 347.8 308.95 28 13 319.8

EW-N2-4 719654.26 1511665.05 337.0 297.86 29 14 308.0

EW-N2-5 719545.70 1511553.31 325.4 292.45 22 7 303.4

NOTE:

1. CONTRACTOR TO SURVEY AND CONFIRM EXISTING CONDITIONS ELEVATIONS AND PROVIDE SURVEY RESULTS FOR

ENGINEER REVIEW AND APPROVAL, PRIOR TO LFG EXTRACTION WELL INSTALLATION.

2. EXISTING ELEVATIONS AT THESE LOCATIONS WERE PROVIDED BY MES VIA EMAIL ON 30 MARCH 2026.

SECTION VIEW

PLAN VIEW

NOTES:

1. GRAVEL PAD TO BE CENTERED ON SINGLE

PENETRATIONS.

2. 72" MARKER POST SHALL HAVE WELL ID. PLACE

TWO MARKERS AT EACH WELL AT OPPOSITE

CORNERS.

2. ALL 72" MARKERS SHALL BE EMBEDDED A

MINIMUM OF 6" BELOW GRADE

GRAVEL PAD

(INTERIM CONDITION)

NOT TO SCALE

72" FIBERGLASS UTILITY

MARKER WITH WELL ID

72" FIBERGLASS UTILITY

MARKER WITH WELL ID

PIPE TO HEADER

(IF BURIED)

WELLHEAD

8 OZ. GEOTEXTILE

3' 1'-6"1'-6"

NOT IN CONTRACT

H : Q

:\P R

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N \C

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O N

W D

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D W

G [C

-5

] S U

A, S

PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

C O

R U

O N

EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

C-502

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

SCALE AS SHOWN

LFG EXTRACTION WELL

DETAILS

INTERIM CONDITION

2' MIN.

3' 10"

12"

GRANULAR FILL

4" DIA. HDPE

4"x8" DIA. HDPE ADAPTER BUSHING

8" DIA. HDPE SLIP COUPLING

DRILL 2 ROWS OF 4 HOLES;

1/2" DIA. EVENLY SPACED

AROUND PERIMETER OF PIPE

STAGGER THE ROWS

8" DIA. HDPE PIPE

8" DIA. HDPE PIPE CAP

EX.

WASTE

TYPICAL BLIND FLANGE

CONDENSATE DRAIN

(INTERIM CONDITION)

NOT TO SCALE

6" DIA. HDPE

LANDFILL

COLLECTION

HEADER

GENERAL BACKFILL

INTERIM CONDITION CELL N1 CONDENSATE DRAIN SCHEDULE

DRAIN ID NORTHING EASTING

EXISTING

ELEVATION (FT)

APPROX.

LINER

ELEVATION

(FT)

CONDENSATE

DRAIN BOTTOM

ELEVATION (FT)

CD-N1-1 719863.61 1510584.35 437.88 374.94 417.88

CD-N1-2 719924.51 1510863.70 400.70 362.00 380.70

CD-N1-3 719740.43 1511024.16 374.40 337.64 354.40

CD-N1-4 719697.34 1511055.99 372.10 327.14 352.10

CD-N1-5 719528.70 1511212.00 331.50 300.96 313.00

CD-N1-6 719888.99 1510433.49 432.20 389.36 412.20

4" DIA. HDPE PIPE

(3% TO MIN. SLOPE)

EX. CONDITIONS

GRAVEL PAD

(SEE DETAIL

SHEET C-501)

12" BENTONITE PLUG 3' MIN.

NOTES:

1. EXISTING ELEVATIONS AT THESE LOCATIONS WERE PROVIDED BY MES VIA EMAIL ON 30

MARCH 2026.

2. CONTRACTOR SHALL FILL 8" HDPE PIPE WITH WATER.

3. 4" HDPE PIPE TO EXTEND ABOVE GRADE IF HEADER PIPE IS NOT BURIED.

INTERIM CONDITION CAISSON TYPE LANDFILL GAS EXTRACTION WELL SCHEDULE

WELL ID

PROPOSED LOCATION EXISTING

ELEVATION

(FT)

APPROX.

LINER

ELEVATION

(FT)

APPROX. WELL

DEPTH (FT)

FROM

EXISTING

ELEVATION

APPROX.

PERFORATED

6" PIPE

LENGTH (FT)

APPROX.

WELL

BOTTOM

ELEVATION

(FT)

NORTHING EASTING

EW-N1-10 719906.31 1510891.83 395.9 359.01 27 24 369.0

EW-N2-3 719838.03 1511536.53 350.5 320.23 20 17 330.0

EW-N2-6 719758.95 1511445.76 358.5 319.11 25 22 333.5

EW-N2-11 719756.30 1511246.57 365.2 328.79 31 28 339.0

NOTE:

1. CONTRACTOR TO SURVEY AND CONFIRM EXISTING CONDITIONS ELEVATIONS AND PROVIDE SURVEY RESULTS FOR

ENGINEER REVIEW AND APPROVAL, PRIOR TO LFG EXTRACTION WELL INSTALLATION.

2. EXISTING ELEVATIONS AT THESE LOCATIONS WERE PROVIDED BY MES VIA EMAIL ON 30 MARCH 2026.

WASTE

LANDFILL GAS CAISSON TYPE EXTRACTION WELL

(INTERIM CONDITION)

NOT TO SCALE

3' DIA.

20'

DEPTH VARIES

REFER TO TABLE

6" DIA. SCH. 40 PVC PERFORATED PIPE

PERFORATIONS SHALL BE 1/2" DIA. HOLES

SPACED 90° APART AROUND PERIMETER

EVERY 6" FOR ENTIRE PERFORATED LENGTH.

LENGTH VARIES

(REFER TO TABLE)

GRANULAR FILL

PVC END CAP

BOTTOM OF WELL

EX. CONDITIONS

2' MIN.

INSTALLATION NOTES:

1. WELLHEAD CASING DRILLING DEPTH TO BE DETERMINED BASED ON LFG EXTRACTION WELL SCHEDULE, FIELD

CONDITIONS AND THE ENGINEER'S DIRECTION.

2. WELLHEAD AND FLOW MEASUREMENT TUBE ASSEMBLY SHALL BE COMPATIBLE WITH CES-LANDTEC GEM-500, GEM-2000, AND GEM-5000 (LANDFILL GAS INSTRUMENTS).

3. 2" WELLHEAD SHALL BE RATED FOR A FLOW RANGE OF 0-50 SCFM.

4. FOR FLEXIBLE CONNECTIONS TO PIPE USE ONLY STAINLESS STEEL V-BAND CLAMPS.

5. GECOMPOSITE ISOLATION RING SHALL FIT TIGHT TO EXTRACTION WELL TO PROVIDE SEPARATION BETWEEN STONE

AND BENTONITE PLUG.

6. TRANSITION FITTING SHALL BE A 24" x 8" HDPE BUSHING WITH A 6" NIPPLE OF 8" SDR-17 HDPE WELDED TO THE TOP.

SOIL AND

BENTONITE

WASTE

30" DIA. BOLTED FLANGE

CONNECTION WITH GASKET

24" DIA. HDPE SDR-17

CAISSON PIPE

3' DIA.

GRAVEL PAD

(SEE DETAIL SHEET C-501)

FROM EXTRACTION WELL

LANDFILL GAS WELLHEAD FOR CAISSON TYPE EXTRACTION WELL

(INTERIM CONDITION)

NOT TO SCALE

INSTALLATION NOTES:

1. DRAWING SHOWS TYPICAL CONNECTION TO A 90° ELBOW. ACTUAL CONNECTION MAY

BE TO A TEE OR COUPLING.

2. WARNING: DO NOT CUT THE FLOW MEASUREMENT TUBE ASSEMBLY. FAILURE TO HEED

THIS WARNING WILL RESULT IN A DAMAGED OR INOPERATIVE WELLHEAD AND VOID

THE WARRANTY.

3. ALLOW SUFFICIENT SLACK IN FLEX HOSE FOR PIPING EXPANSION AND CONTRACTION.

AN EXTRA 6-12" IS RECOMMENDED.

4. SUPPLY BRASS ID TAG WITH NUMBER AT EACH WELLHEAD.

5. REFER TO QED WELLHEAD INSTALLATION AND OPERATION MANUAL. READ

INSTRUCTIONS THOROUGHLY BEFORE ATTEMPTING ASSEMBLY AND INSTALLATION OF

WELLHEAD ON WELL CASING.

6. 4" DIA. PIPE TO TERMINATE ABOVE GRADE IF LATERAL PIPING IS NOT BURIED.

12"

1' MIN.

6" DIA. SCH. 40 PVC SOLID PIPE

LANDFILLGAS

WELLHEAD

ASSEMBLY

(SEE DETAIL

SHEET C-501) TRANSITION FITTING (SEE NOTE 6.)

6" FLEXIBLE COUPLING

GWC62 WELL CAP 6" WELL x

2" GAS WELLHEAD

2" ORIFICE PLATE ASSEMBLY

FEMALE QUICK CONNECT

MANUFACTURED BY McMASTER-CARR

PART # 5012K31 OR APPROVED EQUAL

2" PRECISION CONTROL VALVE

2" SCH. 80 PVC PIPE

1/4" LABLOCK

SLOPE

ABOVEGROUND

PIPING TO HEADER

2" X 4" FLEXIBLE

COUPLING

4" DIA. PIPE

FEMALE QUICK CONNECTS MANUFACTURED BY

McMASTER-CARR PART # 5012K31 OR APPROVED EQUAL

INTERMEDIATE

SOIL COVER 1'

8" x 6" FLEXIBLE

COUPLING

WASTE

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PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

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EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

C-503

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

FINAL CONDITION TRADITIONAL LANDFILL GAS EXTRACTION WELL SCHEDULE

WELL ID

PROPOSED LOCATION N1-N2 CLOSURE

CAP ELEVATION

(FT)

APPROX.

LINER

ELEVATION

(FT)

APPROX. EXISITING

WELL EXTENSION

(FT) TO CLOSURE

CAP

APPROX. TOTAL

WELL DEPTH

FROM CLOSURE

CAP (FT)NORTHING EASTING

EW-N1-1 720206.88 1510652.99 458.35 394.13 5 54

EW-N1-2 720152.84 1510730.68 455.22 386.54 12 59

EW-N1-3 720090.87 1510796.05 460.37 379.07 43 71

EW-N1-4 720135.18 1510599.33 459.41 391.46 6 58

EW-N1-5 720111.56 1510662.81 473.02 385.76 19 77

EW-N1-6 720059.68 1510728.93 473.40 379.45 40 84

EW-N1-7 720008.42 1510802.00 472.81 372.11 57 91

EW-N1-8 720059.82 1510530.10 453.90 391.27 7 53

EW-N1-9 719923.09 1510663.08 471.98 372.25 23 89

EW-N1-11 719906.97 1510447.80 445.81 389.06 8 47

EW-N1-12 719746.01 1510612.23 417.61 366.32 9 41

EW-N1-13 719743.35 1510813.96 431.12 349.60 13 72

EW-N1-14 719606.27 1510780.34 391.44 344.81 8 37

EW-N1-15 719702.13 1511036.02 396.38 330.02 24 56

EW-N1-16 719514.83 1510886.35 359.50 323.95 2 26

EW-N1-17 719521.74 1511213.22 330.56 299.66 -6 (SHORTEN) 21

EW-N1-18 719535.52 1511055.66 349.41 308.95 4 30

EW-N2-4 719654.26 1511665.05 345.43 297.99 8 37

EW-N2-5 719545.70 1511553.31 330.36 292.22 5 28

EW-N2-12 719565.31 1511429.18 341.58 307.22 4 24 LFG EXTRACTION WELL

DETAILS

FINAL CONDITION

WASTE

800-624-2026 www.qedenv.com

TRADITIONAL LANDFILL GAS EXTRACTION WELL

(FINAL CONDITION)

NOT TO SCALE

LANDFILL GAS WELLHEAD

(SEE DETAIL SHEET C-504)

GRAVEL PAD

(SEE DETAIL SHEET C-504)

EXISTING 2' BENTONITE PLUG

EXISTING 6" HDPE SDR17 PERFORATED PIPE

EXISTING GEOCOMPOSITE ISOLATION RING

GRANULAR FILL

HDPE END CAP

BOTTOM OF WELL

LANDFILL GAS HEADER ISOLATION VALVE

(FINAL CONDITION)

NOT TO SCALE

UTILITY

MARKER (TYP)

GAS SAMPLE

PORT AND FEMALE

END TO ACCEPT

TEST PORT, TYP.

COVER

GRAVEL PAD

(SEE DETAIL

SHEET C-504)

TWO PIECE REMOVABLE STEM 1/4" S.S. TUBING, TYP.

FLOW

MIN.

DISTANCE TO

ALLOW FOR

BUTT FUSION

6" DIA. LFG

HEADER PIPE

HDPE VALVE STEM

AND SAMPLING TUBE

SLEEVE

TAP

6" BUTTERFLY VALVE

PROVIDE PIPE BEDDING

FOR SUPPORTBUTT WELDED

FLANGE, TYP.

FINAL CONDITIONS

INSTALLATION NOTES:

1. WELLHEAD CASING DRILLING DEPTH TO BE DETERMINED BASED ON LFG EXTRACTION WELL SCHEDULE, FIELD CONDITIONS AND THE ENGINEER'S DIRECTION.

2. WELLHEAD AND FLOW MEASUREMENT TUBE ASSEMBLY SHALL BE COMPATIBLE WITH CES-LANDTEC

GEM-500, GEM-2000, AND GEM-5000 (LANDFILL GAS INSTRUMENTS).

3. 2" WELLHEAD SHALL BE RATED FOR A FLOW RANGE OF 0-50 SCFM.

4. FOR FLEXIBLE CONNECTIONS TO PIPE USE ONLY STAINLESS STEEL V-BAND CLAMPS.

5. GECOMPOSITE ISOLATION RING SHALL FIT TIGHT TO EXTRACTION WELL TO PROVIDE SEPARATION BETWEEN

STONE AND BENTONITE PLUG.

NOTES:

1. BURIED VALVES SHALL USE STAINLESS STEEL HARDWARE WITH

ANTISEIZE COMPOUND AND BE WRAPPED IN POLYETHYLENE SHEETING

PRIOR TO BACKFILLING.

2. VALVES SHALL HAVE PERMANENT (NOT PAINTED) OPEN/CLOSE

POSITION INDICATOR ON VALVE HANDLE

3. ALL VALVES SHALL BE CLEARLY MARKED WITH VALVE ID.

4. IF NOT BURIED, AN OPERATING WHEEL MAY BE PLACED IN LIEU OF

STEM, AS APPROVED BY THE ENGINEER.

LANDFILL GAS CAISSON TYPE EXTRACTION WELL

(FINAL CONDITION)

NOT TO SCALE

INSTALLATION NOTES:

1. WELLHEAD CASING DRILLING DEPTH TO BE DETERMINED BASED ON LFG EXTRACTION WELL SCHEDULE, FIELD CONDITIONS AND THE ENGINEER'S DIRECTION.

2. WELLHEAD AND FLOW MEASUREMENT TUBE ASSEMBLY SHALL BE COMPATIBLE WITH CES-LANDTEC

GEM-500, GEM-2000, AND GEM-5000 (LANDFILL GAS INSTRUMENTS).

3. 2" WELLHEAD SHALL BE RATED FOR A FLOW RANGE OF 0-50 SCFM.

4. FOR FLEXIBLE CONNECTIONS TO PIPE USE ONLY STAINLESS STEEL V-BAND CLAMPS.

5. GECOMPOSITE ISOLATION RING SHALL FIT SNUG TO EXTRACTION WELL TO PROVIDE SEPARATION BETWEEN

STONE AND BENTONITE PLUG.

WASTE

LANDFILL GAS WELLHEAD

(SEE DETAIL SHEET C-504)

6" DIA. SCH. 40 PVC PERFORATED PIPE

PERFORATIONS SHALL BE 1/2" DIA. HOLES

SPACED 90° APART AROUND PERIMETER

EVERY 6" FOR ENTIRE PERFORATED LENGTH.

GRANULAR FILL

PVC END CAP

BOTTOM OF WELL

FINAL CONDITIONS

OPEN END

OF CAISSON

800-624-2026 www.qedenv.com

24" DIA. CAISSON

EX. 30" FLANGED CAISSON CONNECTION

VEGETATIVE

SUPPORT SOIL

CLOSURE CAP

SUBGRADE

GEOCOMPOSITE

GEOMEMBRANE

GEOTEXTILE

VEGETATIVE

SUPPORT SOIL

CLOSURE CAP

SUBGRADE

GEOCOMPOSITE

GEOMEMBRANE

GEOTEXTILE

4" TOPSOIL

VEGETATIVE

SUPPORT SOIL

NOTE:

1. CONTRACTOR TO SURVEY AND CONFIRM EXISTING CONDITIONS ELEVATIONS AND PROVIDE SURVEY RESULTS FOR ENGINEER

REVIEW AND APPROVAL, PRIOR TO LFG EXTRACTION WELL INSTALLATION.

FINAL CONDITIONS

EXISTING 6" HDPE LANDFILL

GAS EXTRACTION WELL

3' DIA.

15'

DEPTH VARIES

REFER TO TABLE

LENGTH VARIES

(REFER TO TABLE)

3'3'2' MIN.

MIN. 12"

3'-0" DIA.

1'-0"

WASTE

DEPTH

VARIES

DEPTH VARIES

REFER TO TABLE

LENGTH VARIES

(REFER TO TABLE)

2' MIN.

2'-0" DIA.

CAISSON

2' MIN.

PIPING TRENCH DETAIL (WITHIN LANDFILL)

(FINAL CONDITION)

NOT TO SCALE

DETECTOR TAPE

4" OR 6" DIA. SDR 17 HDPE

LFG COLLECTION

EX. CLOSURE CAP SUBGRADE

APPROX. 2' DEEP WITH WASTE BELOW

SOIL BEDDING

D D/2D/2

2' MIN.

(TYP.)

VEGETATIVE

SUPPORT SOIL

GEOCOMPOSITE

GEOMEMBRANE

GEOTEXTILE

4" TOPSOIL

PIPING TRENCH DETAIL (OUTSIDE LANDFILL)

(FINAL CONDITION)

NOT TO SCALE

DETECTOR TAPE

4" OR 6" DIA. SDR 17 HDPE

LFG COLLECTION

EX. CONDITIONS

SOIL BEDDING

D/2D/2

2' MIN.

GENERAL BACKFILL

EMBED 12" MAX. (TYP.)

10' MIN.

6" HDPE

SDR17

SOLID PIPE

FINAL CONDITION CAISSON LANDFILL GAS EXTRACTION WELL SCHEDULE

WELL ID

PROPOSED LOCATION N1-N2 CLOSURE

CAP ELEVATION

(FT)

APPROX. LINER

ELEVATION (FT)

APPROX. EXISITING

WELL EXTENSION

(FT) TO CLOSURE

CAP

APPROX. TOTAL

WELL DEPTH FROM

CLOSURE CAP (FT)NORTHING EASTING

EW-N1-10 719906.31 1510891.83 468.41 359.01 72 99

EW-N2-1 720213.77 1511301.77 400.84 361.40 32 29

EW-N2-2 720027.15 1511409.40 388.71 339.83 38 39

EW-N2-3 719838.03 1511536.53 380.01 320.19 29 50

EW-N2-6 719758.95 1511445.76 399.26 319.03 41 70

EW-N2-7 719979.49 1511308.88 422.23 341.39 70 71

EW-N2-8 720152.22 1511164.23 434.17 365.34 65 59

EW-N2-9 720077.33 1511022.62 444.00 371.63 71 62

EW-N2-10 719922.11 1511127.55 450.69 348.22 93 92

EW-N2-11 719756.30 1511246.57 400.58 328.3 33 62

NOTE:

1. CONTRACTOR TO SURVEY AND CONFIRM EXISTING CONDITIONS ELEVATIONS AND PROVIDE SURVEY RESULTS FOR ENGINEER REVIEW

AND APPROVAL, PRIOR TO LFG EXTRACTION WELL INSTALLATION.

DEPTH VARIES

15'

SOIL BACKFILL

2' BENTONITE PLUG

6" HDPE SDR17 PERFORATED PIPE

PERFORATIONS SHALL BE 1/2" DIA. HOLES

SPACED 90° APART AROUND PERIMETER

EVERY 6" FOR ENTIRE PERFORATED LENGTH.

GEOCOMPOSITE ISOLATION RING

6" HDPE LANDFILL GAS

EXTRACTION WELL

EXISTING SOIL BACKFILL

CUT EXISTING HDPE PIPE AND INSTALL

FLANGE CONNECTION

(SEE DETAIL C-504)

PERFORATED

LENGTH VARIES

(REFER TO TABLE)

SOIL BACKFILL

2' BENTONITE PLUG

EXISTIN

SED

LLDPE LINER PENETRATION

(SEE DETAIL SHEET C-504)

LLDPE LINER PENETRATION

(SEE DETAIL SHEET C-504)

GRAVEL PAD

(SEE DETAIL SHEET C-504)

GEOCOMPOSITE ISOLATION RING

FOR INFORMATION ONLY - NOT IN CONTRACT

6" DIA. SCH. 40 PVC SOLID PIPE

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PROFESSIONAL CERTIFICATION. I HEREBY CERTIFY THAT

THESE DOCUMENTS WERE PREPARED OR APPROVED BY ME,

AND THAT I AM A DULY LICENSED PROFESSIONAL ENGINEER

UNDER THE LAWS OF THE STATE OF MARYLAND,

LICENSE NO. 36798

EXPIRATION DATE: 01-19-2027

O R

C O

R U

O N

EA Engineering, Science, and Technology, Inc., PBC www.eaest.com

OF 10

C-504

MD83F

NAVD88

3241 SCARBORO ROAD

STREET, MARYLAND 21154

HARFORD WASTE DISPOSAL

CENTER

LANDFILL GAS EXPANSION

DESIGN

DRAWN BY: DPA DESIGNED BY: SS

CHECKED BY: SMD/GAT PROJECT MANAGER: LJO

PROJECT NUMBER: 1577623

DATE: APRIL 2026 SHEET:

DRAWING NO.

DRAWING INFORMATION

DRAWING TITLE

PROJECT ADDRESS

PROJECT NAME

SEAL

REVISIONS

225 Schilling Circle, Suite 400 Hunt Valley, Maryland 21031

(410) 584-7000

FULL SIZE PLOT: 24" x 36"

HORIZONTAL DATUM:

VERTICAL DATUM:

LFG EXTRACTION WELL

DETAILS

FINAL CONDITION

DUCTILE IRON WITH RED OXIDE PRIMER

BACK-UP RING W/SS NUTS AND BOLTS

HDPE PIPE

(SIZE VARIES)

HDPE STUB END

(SIZE VARIES)

PIPE COUPLING

(SIZE VARIES)

HDPE PIPE

(SIZE VARIES)

GASKET

(SIZE VARIES)

NOTES:

1. CONNECTION DETAIL IS A COMPRESSION FITTING, WHICH IS

TYPICAL OF ALL GAS PIPELINE CONNECTIONS WHERE INDICATED.

2. GASKETS SHALL BE VITON OR APPROVED EQUAL.

3. PROVIDE PIPE COUPLING AS REQUIRED.

HDPE FLANGE

(SIZE VARIES)

HDPE FLANGE

(SIZE VARIES)

GAS COLLECTION PIPING FLANGE CONNECTION DETAIL

NOT TO SCALE

WASTE

CLOSURE CAP SUBGRADE

VEGETATIVE

SUPPORT SOIL

6' x 6' x 4" GRAVEL PAD

(SEE DETAIL THIS SHEET)

HDPE CLOSURE LINER PENETRATION

(SEE DETAIL THIS SHEET)

BENCHING

LANDFILL GAS LATERAL

(3% MIN. SLOPE, SEE NOTE 1)

LANDFILL GAS WELLHEAD

LANDFILL GAS EXTRACTION WELL

1'±

NOTES:

1. CONTRACTOR SHALL ADJUST BURIAL DEPTH ACROSS BENCHES TO MAINTAIN 3.0% MINIMUM SLOPE

WITHIN LANDFILL GAS COLLECTION SYSTEM.

2. THIS DETAIL APPLIES WHERE LANDFILL GAS LATERAL PIPING CROSSES A BENCH OR WHERE AN

EXTRACTION WELL IS LOCATED ON A BENCH.

4" MIN.

4" TOPSOIL

LANDFILL GAS LATERAL BENCH CROSSING

(FINAL CONDITION)

NOT TO SCALE

GEOCOMPOSITE

GEOMEMBRANE

GEOTEXTILE

2' MIN.

SLOPE

800-624-2026 www.qedenv.com

COLLECTION LATERAL

PIPING TO HEADER

FROM EXTRACTION WELL

ELEVATION

LANDFILL GAS WELLHEAD

(FINAL CONDITION)

NOT TO SCALE

4' ±

30"

2'-0"

FEMALE QUICK CONNECT

MANUFACTURED BY McMASTER-CARR

PART # 5012K31 OR APPROVED EQUAL

2" X 4" FLEXIBLE

COUPLING

4" DIA. PIPE

2" SCH. 80 PVC PIPE

GWC62 WELL CAP 6" WELL x

2" GAS WELLHEAD

2" ORIFICE PLATE ASSEMBLY

2" PRECISION CONTROL VALVE2" DIA. FLEXIBLE HOSE

2" SCH. 80 PVC PIPE

6" PIPE

6" FLEXIBLE COUPLING

1/4" LABLOCK

GRAVEL PAD

(SEE DETAIL THIS SHEET)

INSTALLATION NOTES:

1. DRAWING SHOWS TYPICAL CONNECTION TO A 90° ELBOW. ACTUAL CONNECTION MAY BE TO A TEE OR

COUPLING.

2. WARNING: DO NOT CUT THE FLOW MEASUREMENT TUBE ASSEMBLY. FAILURE TO HEED THIS WARNING WILL

RESULT IN A DAMAGED OR INOPERATIVE WELLHEAD AND VOID THE WARRANTY.

3. ALLOW SUFFICIENT SLACK IN FLEX HOSE FOR PIPING EXPANSION AND CONTRACTION. AN EXTRA 6-12" IS

RECOMMENDED.

4. SUPPLY BRASS ID TAG WITH NUMBER AT EACH WELLHEAD.

5. REFER TO QED WELLHEAD INSTALLATION AND OPERATION MANUAL. READ INSTRUCTIONS THOROUGHLY

BEFORE ATTEMPTING ASSEMBLY AND INSTALLATION OF WELLHEAD ON WELL CASING.

6. 4" DIA. PIPE TO TERMINATE ABOVE GRADE IF LATERAL PIPING IS NOT BURIED.

FINAL

CONDITIONS

FEMALE QUICK CONNECTS

MANUFACTURED BY

McMASTER-CARR

PART # 5012K31 OR

APPROVED EQUAL

VEGETATIVE

SUPPORT SOIL

CLOSURE CAP

SUBGRADE

GEOCOMPOSITE

GEOMEMBRANE

GEOTEXTILE

4" TOPSOIL

WASTE

CL CL

TRADITIONAL LANDFILL GAS WELL EXTENSION

(FINAL CONDITION)

NOT TO SCALE

CLOSURE CAP SUBGRADE 2'

EXISTING WELL HEAD

NOTES:

1. BACKFILL WITHIN 5-FT OF LANDFILL GAS EXTRACTION WELL TO BE PERFORMED BY HAND.

2. PLACE BACKFILL SOIL BY HAND IN MAXIMUM 8-IN LIFTS AND MECHANICALLY TAMP.

3. CONTINUE TO PLACE BACKFILL IN LIFTS AND COMPACT UNTIL FINAL SUBGRADE

ELEVATION IS ACHIEVED.

4. VEGETATIVE SUPPORT SOIL AND TOPSOIL NOT SHOWN FOR CLARITY.

EXISTING BACKFILL APPRX. 36"ØEXISTING 6" HDPE LANDFILL

GAS EXTRACTION WELL

EXTEND EXISTING LANDFILL GAS WELL WITH 6" HDPE SDR17

PIPE PER LFG EXTRATION WELL DETAIL,

THIS SHEET AND INSTALL LANDFILL GAS WELLHEAD

PER THE LANDFILL GAS WELLHEAD DETAIL, SHEET C-501

GEOSYNTHETIC CLOSURE CAPPROPOSED GRADE

(VARIES)

CUT EXISTING HDPE PIPE AND INSTALL FLANGE CONNECTION PER

THE GAS COLLECTION PIPING FLANGE CONNECTION DETAIL

(SEE DETAIL THIS SHEET)

REMOVE AND REUSE WELLHEAD ASSEMBLY

EXISTING COVER SOIL

AND WASTE

SECTION VIEW

PLAN VIEW

NOTES:

1. GRAVEL PAD TO BE CENTERED ON SINGLE PENETRATIONS.

2. 72" MARKER POST SHALL HAVE WELL ID. PLACE TWO MARKERS AT EACH

WELL AT OPPOSITE CORNERS.

GRAVEL PAD

NOT TO SCALE

72" FIBERGLASS UTILITY

MARKER WITH WELL ID

72" FIBERGLASS UTILITY

MARKER WITH WELL ID

PIPE TO HEADER

(IF BURIED)

WELLHEAD

8 OZ. GEOTEXTILE

3' 1'-6"1'-6"

A A

SECTION A-A

NOTES:

1. THIS DETAIL IS TYPICAL FOR ALL 6" DIA. SDR 17 HDPE PIPE

PENETRATIONS.

2. A MINIMUM 1' OF EXCESS SLACK BETWEEN CLAMPS AND WELD

SHALL BE PROVIDED.

" V

R T

40-MIL LLDPE

GEOMEMBRANE PIPE

BOOT WELDED TO 40-MIL

LLDPE GEOMEMBRANE

CAP LINER (SEE NOTE 2)

GRAVEL

1/4"x6" MINIMUM CLOSED

CELL NEOPRENE SPONGE

SC 42-M OR CORD

PACKING

40 MIL LLDPE LINER

LLDPE CLOSURE LINER PENETRATION

NOT TO SCALE

1/8"x1/2" WIDE STAINLESS STEEL CLAMP (TYP. OF 2)1/4"x6" MINIMUM CLOSED

CELL NEOPRENE

SPONGE SC 42-M

OR CORD PACKING

6" SDR 17 HDPE

SOLID WALL PIPE

6" SDR 17 HDPE

SOLID WALL PIPE

GRAVEL PAD

(SEE DETAIL THIS SHEET)

1/8"x1/2" WIDE STAINLESS

STEEL CLAMP (TYP. OF 2)

CAP SUBGRADE

GENERAL BACKFILL

LANDFILL GAS EXTRACTION WELL

EXISTING GRADE (VARIES)

FOR INFORMATION ONLY - NOT IN CONTRACT

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This is the start of the file's text. The full file is on GovTribe.

File details come from the government source that posted it. Updated May 28, 2026.