Grading and Drainage Plan

BENCHMARK OWNER/DEVELOPER
WARNER ROAD
GRADING AND DRAINAGE ELLSWORTH ENERGY CENTER, LLC
FOUND PK-NAIL WITH TAG "COM BM" ON SOUTH SIDE OF A HEADWALL NEAR THE NORTHWEST 700 UNIVERSE BOULEVARD
SITE Phone (214) 473-4640 2901 Dallas Parkway, Suite 400
CORNER OF HAWES ROAD AND ELLIOT ROAD. JUNO BEACH, FL 33408 Tol Free (888) 937-5150 Plano, TX 75093
ELEVATION: 1377.52 (PER CITY OF MESA) ROAD ROAD westwoodps.com
DATUM: NAVD88 Westwood Professional Services, Inc.
ENGINEER
HAWES ST. E STARFIRE AVE Arizona Reg. Firm NO. F-1406398-2
PLAN ELLSWORTH
BASIS OF BEARING WESTWOOD PROFESSIONAL SERVICES
ROUTE
2901 DALLAS PARKWAY, SUITE 400
THE EAST-WEST MID-SECTION LINE OF SECTION 21, TOWNSHIP 1 SOUTH, RANGE 7 EAST OF THE GILA AND SALT PLANO, TX 75093 24
RIVER MERIDIAN, MARICOPA COUNTY, ARIZONA MONUMENTED AT THE WEST END BY A 3-INCH CITY OF MESA PHONE: (214) 473-4640
BRASS CAP IN HAND HOLE ACCEPTED AS THE WEST QUARTER CORNER OF SAID SECTION 21, AND MONUMENTED CONTACT: BRENDAN MILLER
PHONE: (720) 315-1045 RAY ROAD
AT THE EAST END BY A 3-INCH MCDOT BRASS IN HAND HOLE ACCEPTED AS THE EAST QUARTER CORNER OF SAID ENERGY STORAGE SYSTEM
SECTION 21 CONSIDERED TO BEAR: SOUTH 89°33'10" WEST
VICINITY MAP
RETENTION VOLUME
NTS
VOLUME PROVIDED= SEE NOTE 6
8930 E STARFIRE AVENUE
VOLUME REQUIRED= 721,397 CF
LEGEND:
MESA, ARIZONA PREPARED FOR:
PROJECT BOUNDARY
DL DISTURBANCE LIMITS
RIGHT-OF-WAY LINE SEC SCANNEL 507 Ellsworth Energy
EASEMENT LINE
2700 EX. MAJOR CONTOUR A PORTION OF THE NORTHEAST QUARTER OF SECTION 21, Center, LLC
EX. MINOR CONTOUR
EX. FLOW ARROW TOWNSHIP 1 SOUTH RANGE 7 EAST OF
EX. FIRE HYDRANT ELLSWORTH 2 ENERGY 700 Universe Boulevard
EX. WATER METER THE GILA AND SALT RIVER MERIDIAN, MARICOPA COUNTY, ARIZONA Juno Beach, FL 33408
CENTER - PROJECT DATA:
EX. WATER VALVE
REVISIONS:
EX. SANITARY SEWER PROJECT ADDRESS: 8930 STARFIRE AVENUE, MESA,
# DATE COMMENT BY CHK APR
EX. SANITARY SEWER MANHOLE C304 A AZ 85212
1381 1383 0+00 A 05/14/2026 ISSUED FOR REVIEW DM MS BM
EX. STORM SEWER
PARCEL NUMBER: A PORTION OF 304-31-149A
EX. BACKFLOW PREVENTER 1381 1382 B 06/10/2026 ISSUED FOR REVIEW DM MS BM
EX. MONUMENT LINE 1380 1379 1384 1384 1384 1384 1384 EXISTING ZONING: LI/PAD C 07/10/2026 ISSUED FOR REVIEW DM MS AK
1378
PROPOSED 100' BATTERY SETBACK LINE 1384 D 08/14/2026 ISSUED FOR REVIEW MP MS BM
PROPOSED ZONING: LI
PROPOSED ACCESS ROAD
1384 E 10/14/2026 ISSUED FOR REVIEW DM MS BM
PROPOSED SECURITY WALL 1383 GENERAL PLAN DESIGNATION: REGIONAL
PROPOSED DRAINAGE BASIN 1+00 1383 EMPLOYMENT CENTER
HIGH RIDGE DL
PROPOSED CULVERT 1383 GL DL
X PROPOSED SECURITY FENCE DL DL DL GL 1383 PROJECT ACREAGE: 20.3 AC
DL DL DL DL GL DL GL DL GL DL DL DL DL
PROPOSED FLOW ARROW GL GL GL GL 4:1 GL 1384 GL
GL GL 5.59% GL PROPOSED USE: BATTERY ENERGY STORAGE SYSTEM
2450 PROPOSED 5' INDEX CONTOUR
(BESS) AND RELATED ANCILLARY STRUCTURES
PROPOSED 1' INTERVAL CONTOUR 1389.50
GL PROPOSED GRADING LIMIT 2+00 DL PAD: ORDINANCE #5976
DL
PROPOSED SWALE GL
GL PARKING SPACES REQUIRED: 4
4:1
PARKING SPACES PROVIDED: 4
1.72% 1389
NOTES DL BOL LG JF2 DC LINK 5.1: 422
DL 1382 1383 1384 1385 1386 1387 1388 1389 1389 1388 1387 GL 1385 EOL LG JF2 DC LINK 5.1: 504
GL 0.80% 5.31% BOL PE FP4200M2: 85
1. ALTA SURVEY FEATURES SHOWN ARE BASED ON DATA 3+00
RECEIVED FROM COLLIER DATED 10/14/2025. 4:1 PROPOSED SWALE EOL PE FP4200M2: 102
2. TOPO FEATURES SHOWN ARE BASED ON DATA FROM 1386 1385 **BOL: BEGINNING OF LIFE
**EOL: END OF LIFE
COLLIERS ENGINEERING & DESIGN DATED 10/28/2025.
DL
3. BESS PROJECT AREA IS LOCATED IN A SHADED FEMA FLOOD GL
DL
ZONE X, WITH A DEFINITION OF: 0.2% ANNUAL CHANCE GL 1388
FLOOD HAZARD. AREAS OF 1% ANNUAL CHANCE FLOOD WITH
AVERAGE DEPTH LESS THAN ONE FOOT OR WITH DRAINAGE
AREAS OF LESS THAN ONE SQUARE MILE. 1378 4+00
4. FURTHER DETAILS ARE SUBJECT TO CITY OF MESA AND DL
GL
ARIZONA STATE REQUIREMENTS. DL
5. EXISTING BASIN SIZED FOR AND TO BE UTILIZED FOR SITE. GL
1379 4:1 1388
GL 5+00 GL DL
DL 1383 1384
1386 1.72% 1388
1387 0.80%
1380
1381 1.96%
EXISTING BASIN GL GL DL
DL 0.49% 1388
6+00
1382
0+00 1+00 2+00 3+00 4+00 1.72% 5+00 6+00 7+00 8+00 9+00 10+00 11+00 11+31 1388
B 4:1 GL DL 1387
C304 DL GL
1377
1378
7+00
GL DL
1379 DL
0' 80' 160' 240'
GL
4:1
GL DL
GL 8+00
DL
1384
1383
GL 1388
GL DL 1385 1386 1387 Ellsworth II
DL 1382
9+00
DL DL DL DL DL 0.49%
55 LF 2-24" HDPE @ 0.5% 1381 Energy Center
GL
GL 1389.47 4:1 DL
L GL GL GL GL 1380 City of Mesa, Arizona
1377 PROPOSED 2 - 24" CULVERT DL DL GL GL GL GL GL GL 1383
1378 GL 2-24" FL=1379.78 DL 4:1 DL GL DL DL DL DL DL DL
GL 1379 1380
Contreras 1380 2-24" FL=1378.46 1379 10+00 DL
DL DL DL DL EXISTING CHANNEL
1380 DL
Padron GL 1379 1380
DL Grading and Drainage
DL
Miguel GL
DL 1385
AM Plan
10:03 GL DL
DL DL DL 11+00
GL
10/21/2026 E. STARFIRE AVE
GL 11+25
GL
GL
N:\0077606.00\_CAD\_Civil\0077606.00-GDP-NORTH.dwg
DATE: 10/14/2026
GL
REV:
SHEET: BYW-C-300 E

Phone (214) 473-4640 2901 Dallas Parkway, Suite 400
Tol Free (888) 937-5150 Plano, TX 75093
westwoodps.com
Westwood Professional Services, Inc.
Arizona Reg. Firm NO. F-1406398-2
1410 1410
PREPARED FOR:
FG: FG: FG:
EG:1382.6 EG:1384.6 FG:1386.41 EG:1383.6 FG:1386.43 EG:1388.0 FG:1386.45 EG:1388.0 FG:1386.47 EG:1387.9 FG:1386.49 EG:1387.8 FG:1386.51 EG:1387.9 FG:1386.53 EG:1383.4 FG:1386.55 EG:1378.1 EG:1382.1
Ellsworth Energy
Center, LLC
PROPOSED ACCESS ROAD
1400 PROPOSED ACCESS ROAD PROPOSED ACCESS ROAD 1400
PROPOSED ACCESS ROAD PROPOSED ACCESS ROAD
700 Universe Boulevard
PROPOSED PROPOSED PROPOSED PROPOSED PROPOSED
BATTERY BATTERY BATTERY BATTERY Juno Beach, FL 33408
PROPOSED 13' TALL SCREENING BATTERY STORAGE AREA STORAGE AREA STORAGE AREA STORAGE AREA PROPOSED 13' TALL SCREENING
STORAGE AREA
REVISIONS:
# DATE COMMENT BY CHK APR
1390 PROJECT BOUNDARY PROJECT BOUNDARY 1390 A 05/14/2026 ISSUED FOR REVIEW DM MS BM
B 06/10/2026 ISSUED FOR REVIEW DM MS BM
0.02% 0.02%
C 07/10/2026 ISSUED FOR REVIEW DM MS AK
D 08/14/2026 ISSUED FOR REVIEW MP MS BM
E 10/14/2026 ISSUED FOR REVIEW DM MS BM
1380 PROPOSED FINISHED GRADE 1380
4:1 MAX (TYP) EXISTING GRADE 4:1 MAX (TYP)
EXISTING CHANNEL
1370 1370
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00
PROFILE A (SEE SHEET BYW-C-300)
1
H. SCALE: 1" = 80'; V. SCALE: 1" = 10'
1410 1410
FG: FG:
EG:1377.3 EG:1383.0 FG:1382.15 EG:1386.5 FG:1383.94 EG:1388.0 FG:1385.66 EG:1388.0 FG:1387.38 EG:1387.9 FG:1389.10 EG:1388.0 FG:1388.89 EG:1388.0 FG:1388.09 EG:1388.3 FG:1387.29 EG:1388.3 FG:1386.49 EG:1388.7
1400 1400
0' 80' 160' 240'
PROPOSED ACCESS ROAD
PROPOSED ACCESS ROAD
PROPOSED ACCESS ROAD
PROPOSED BATTERY STORAGE AREA PROPOSED BATTERY STORAGE AREA
PROJECT BOUNDARY
1390 PROPOSED 13' TALL 1390
SCREENING WALL -0.80%
1.72%
-0.80%
1.72% 1.72% Ellsworth II
PROPOSED 13' TALL
1.73% SCREENING WALL PROPOSED SWALE
PROJECT BOUNDARY
4:1 MAX (TYP)
1380 1380 Energy Center
4:1 MAX (TYP)
City of Mesa, Arizona
PROPOSED FINISHED GRADE
EXISTING GRADE
Contreras
1370 1370
Padron
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00
Grading Profile Plan
Miguel
AM
PROFILE B (SEE SHEET BYW-C-300)
10:03
2
H. SCALE: 1" = 80'; V. SCALE: 1" = 10'
10/21/2026
N:\0077606.00\_CAD\_Civil\0077606.00-GDP-NORTH.dwg
DATE: 10/14/2026
REV:
SHEET: BYW-C-301 E