Grading and Drainage Plan

OWNER/DEVELOPER
BENCHMARK WARNER ROAD
GRADING AND ELLSWORTH ENERGY CENTER, LLC
CITY OF MESA BENCHMARK. BRASS TAG LOCATED AT THE NORTHWEST CORNER INTERSECTION OF ELLSWORTH & 700 UNIVERSE BOULEVARD
Phone (214) 473-4640 2901 Dallas Parkway, Suite 400
ELLIOT ON CONCRETE PAD. JUNO BEACH, FL 33408 Tol Free (888) 937-5150 Plano, TX 75093
ELEVATION: 1405.91 ROAD SITE ROAD westwoodps.com
DATUM: NAVD88 Westwood Professional Services, Inc.
E STARFIRE AVE
ENGINEER
HAWES ST. Arizona Reg. Firm NO. F-1406398-2
ELLSWORTH
BASIS OF BEARING DRAINAGE PLAN WESTWOOD PROFESSIONAL SERVICES
ROUTE
2901 DALLAS PARKWAY, SUITE 400
BASIS OF BEARING IS S89'33'17E, ALONG THE NORTH LINE OF
PLANO, TX 75093 24
THE SOUTHEAST QUARTER OF SECTION 21, TOWNSHIP 1 SOUTH,
PHONE: (214) 473-4640
RANGE 7 EAST OF THE GILA AND SALT RIVER BASE AND
CONTACT: BRENDAN MILLER
MERIDIAN, MARICOPA COUNTY, ARIZONA RAY ROAD
ENERGY STORAGE SYSTEM PHONE: (720) 315-1045
VICINITY MAP
LEGEND: RETENTION VOLUME NTS
VOLUME PROVIDED= 219,890 CF
PROJECT BOUNDARY 8759 E STARFIRE AVENUE
VOLUME REQUIRED= 161,565 CF
PROPERTY SECTION LINE
DL DISTURBANCE LIMITS
MESA, ARIZONA PREPARED FOR:
PARCEL LINE
RIGHT-OF-WAY LINE
EASEMENT LINE
SEC SUNBELT MESA RAY 202 Ellsworth Energy
2700 EX. MAJOR CONTOUR
EX. MINOR CONTOUR
Center, LLC
EX. FLOW ARROW TRACT A & A PORTION OF LOT 1, VIEW 202, AS RECORDED IN BOOK 1638 OF MAPS, PAGE 11 OF MARICOPA
EX. FIRE HYDRANT
COUNTY, ARIZONA, LOCATED WITHIN THE SOUTH HALF OF THE SECTION 21, TOWNSHIP 1 SOUTH RANGE 7 ELLSWORTH 1 ENERGY
EX. WATER METER 700 Universe Boulevard
EX. WATER VALVE EAST, OF THE GILA AND SALT RIVER MERIDIAN, MARICOPA COUNTY, ARIZONA CENTER - PROJECT DATA: Juno Beach, FL 33408
EX. SANITARY SEWER
HH HH REVISIONS:
EX. SANITARY SEWER MANHOLE PROPOSED SCREENING WALL (TYP) PROJECT ADDRESS: 8759 STARFIRE AVENUE, MESA,
# DATE COMMENT BY CHK APR
EX. STORM SEWER 1381 AZ 85212
EX. BACKFLOW PREVENTER A 1382 A 05/14/2026 ISSUED FOR REVIEW DM MS BM
EX. MONUMENT LINE C301 N-S PARCEL NUMBER: A PORTION OF 304-31-044E B 06/10/2026 ISSUED FOR REVIEW DM MS BM
1382 1380
PROPOSED 100' BATTERY SETBACK LINE 1379 1378 0+00 1381 EXISTING ZONING: LI/PAD C 07/10/2026 ISSUED FOR REVIEW DM MS AK
PROPOSED ACCESS ROAD 1377
GL DL GL DL GL DL DL DL DL DL DL DL DL DL PROPOSED ZONING: LI D 08/14/2026 ISSUED FOR REVIEW MP MS BM
PROPOSED SECURITY WALL GL GL GL GL GL GL 4:1 GL GL DL
PROPOSED DRAINAGE BASIN E. STARFIRE AVE E 10/14/2026 ISSUED FOR REVIEW DM MS BM
HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH HH GL GENERAL PLAN DESIGNATION: REGIONAL
PROPOSED CULVERT DL PROPOSED SUBSTATION GL EMPLOYMENT CENTER
1375 GL
PROPOSED FIRE HYDRANT (1.93 AC) DL
X PROPOSED SECURITY FENCE 1379 PROJECT ACREAGE: 21.8 AC
1+00 GL
PROPOSED FLOW ARROW 1.19%
2450 PROPOSED 5' INDEX CONTOUR PROPOSED USE: BATTERY ENERGY STORAGE SYSTEM
DL 1378 17.98% DL (BESS) AND RELATED ANCILLARY STRUCTURES
PROPOSED 1' INTERVAL CONTOUR
GL PROPOSED GRADING LIMIT GL 1377 PAD: ORDINANCE #5976
UMV14 GL
PROPOSED DRYWELL
1.00% 1378
PROPOSED SWALE PARKING SPACES REQUIRED: 4
1376 2+00 DL PARKING SPACES PROVIDED: 4
PROPOSED STORM DRAIN
DL
0.97% 1372.5
NOTES 1375 BOL LG JF2 DC LINK 5.1: 262
GL
GL EOL LG JF2 DC LINK 5.1: 334
BOL PE FP4200M2: 49
1. ALTA SURVEY FEATURES SHOWN ARE BASED ON DATA PARCEL NO. 1 TIE INTO PROPOSED GRADING BY OTHER
EOL PE FP4200M2: 62
RECEIVED FROM HUNTER ENGINEERING DATED 12/17/2024. DL DL
**BOL: BEGINNING OF LIFE
2. TOPO FEATURES SHOWN ARE BASED ON DATA FROM
GL 1.12% UMV21 PROPOSED BASIN **EOL: END OF LIFE
COLLIERS ENGINEERING & DESIGN DATED 10/28/2025. 3+00 UMV20
UMVAUX21D1 UMV19 (BY OTHERS)
3. BESS PROJECT AREA IS LOCATED IN A SHADED FEMA FLOOD GL
ZONE X, WITH A DEFINITION OF: 0.2% ANNUAL CHANCE
FLOOD HAZARD. AREAS OF 1% ANNUAL CHANCE FLOOD WITH DL UMV20 UMV21
AVERAGE DEPTH LESS THAN ONE FOOT OR WITH DRAINAGE GL DL
AREAS OF LESS THAN ONE SQUARE MILE. TRACT UMVAUX21D1 1377 1392 UMV17
4. FURTHER DETAILS ARE SUBJECT TO CITY OF MESA AND UMVAUX22D1 UMV19 EXISTING BUILDING
UMV18
ARIZONA STATE REQUIREMENTS. UMVAUX21D1 UMVAUX21D1 GL
5. DISTURBANCE LIMITS INCLUDE ENTIRE PARCEL. A DL PROPOSED BASIN UMV14 UMV15 UMV14 UMV15 4+00 UMV14 UMV15
6. DRAINAGE ON ADJACENT SITES WILL BE MODIFIED PRIOR TO GL UMV16 UMV16 UMV20 UMV21
DL
CONSTRUCTION 4:1 UMV17
4:1 UMVAUX21D1 UMV19
B E-W 0+00 1+00 2+00 UMV15 3+00 4+00 5+00 6+00 UMV18 7+00 7+45
DL GL
C302
GL UMVAUX22D1 UMV21
1373 5+00 1.26% UMV20 DL C
1374
UMV17 1379 C301 N-S PROPOSED 13' HIGH SCREENING WALL (TYP)
DL UMVAUX21D1 UMV18 UMV19 PROPOSED SWALE TIE INTO PROPOSED
UMV15 GL 0+00
GL GRADING BY OTHER
BASIN 1 1378 UMV20 UMV21 TIE INTO PROPOSED GRADING BY OTHER HIGH RIDGE
HW = 1372.00' UMV15 DL
UMVAUX22D1 GL DL GL DL GL DL GL DL GL DL GL DL GL DL GL DL GL DL GL DL GL
TOP ELEV = 1373.00' DL
6+00 1377 UMV19
BOTTOM ELEV = 1370.00' GL UMV18
VOLUME PROVIDED: 149,977 CF 0.50% 4:1 0.50% DL
4:1 1380
TOTAL VOLUME REQUIRED: 161,565 CF UMV21 1382 1381 1+00
1375 1376 UMVAUX21D1 UMV20 1382
PROPOSED DRYWELL (TYP) DL
1382.67 GL
1374 1377 UMV19 1377
1375 UMV18 UMV21 UMV21 UMV21 UMV21 UMV21 5.48%
1.43% UMVAUX22D1 1382 PROPOSED DL BASIN 0' 80' 160' 240'
7+00
1374 1.49% (BY OTHERS)
DL
GL
1376 2+00 0.50% GL
UMV19 1381
4:1 1373 UMV18 UMVAUX22D1
DL
DL
GL 1370 1.03% UMVAUX22D1 UMVAUX22D1 UMVAUX22D1 0.89% PROPOSED SWALE 8:1
1370 8+00
GL
1380
1.34% UMV19
PROPOSED EMERGENCY OVERFLOW (TYP) DL UMV18 1378 1380 3+00 Ellsworth I
DL
D E-W 0+00 GL 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00 12+00 12+31
C302
1379 GL Energy Center
1381.29
DL 9+00 UMV18 UMV18 UMV18 UMV18 UMV18 DL
GL
4:1 DL GL City of Mesa, Arizona
GL
4+00
4:1 1382 DL
1385 1377 5:1
1376 1375
Contreras DL 1374 DL GL
GL
PROPOSED 1370 STORM SEWER OUTFALL
Padron 1386 10+00 1377 GL 1378 GL 1379 GL GL GL 1376 DL Grading and Drainage
1375 DL DL 1380 DL DL DL GL DL GL DL GL DL GL DL GL DL GL DL GL GL
Miguel DL
AM 1380 1375 DL GL 1380 5+00 PROPOSED CULVERT (BY OTHERS) Plan
1387 BASIN 2
10:01 1385 HW = 1372.00' EXISTING DRYWELL TO REMAIN
1388 10+65 GL DL 1380 TOP ELEV = 1377.00' 5+30
10/21/2026 PROPOSED 13' HIGH SCREENING BOTTOM ELEV = 1374.00' PROPOSED BASIN (BY OTHERS)
1376 DL 1381 WALL WITH WEEP HOLES
GL VOLUME PROVIDED: 69,913 CF
TOTAL VOLUME REQUIRED: 161,565 CF
1389 GL 1381 1381 1381
1388 TRACT
1383 DL 1376 1373 DL
A 1375
1387 1390
N:\0077606.00\_CAD\_Civil\0077606.00-GDP-SOUTH.dwg 1382 PROPOSED 13' HIGH SCREENING WALL (TYP) 1380 DATE:
1380 10/14/2026
1384 DL
1381 1386 DL REV:
1391
SHEET: BYW-C-300 E
138

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
FG: EG: FG:
EG:1379.3 EG:1377.1 FG:1377.72 EG:1380.4 FG:1377.20 EG:1389.6 FG:1376.78 EG:1390.3 FG:1376.40 EG:1380.4 FG:1376.04 EG:1376.5 FG:1375.78 EG:1376.3 FG:1375.50 EG:1372.6 FG:1375.29 EG:1372.6 FG:1370.00 EG:1375.7 FG:1375.71
PROJECT BOUNDARY
1400 1400
PROPOSED 13' TALL
SCREENING WALL PROPOSED 13' TALL
SCREENING WALL
PREPARED FOR:
PROPOSED ACCESS ROAD PROPOSED PROPOSED ACCESS ROAD PROPOSED ACCES ROAD
BATTERY
PROPOSED SUBSTATION AREA PROPOSED BATTERY STORAGE AREA
1390 STORAGE 1390 Ellsworth Energy
AREA
Center, LLC
PROJECT
BOUNDARY
700 Universe Boulevard
Juno Beach, FL 33408
1380 EXISTING GRADE 1380
-0.68% REVISIONS:
-0.42% # DATE COMMENT BY CHK APR
-0.29%
A 05/14/2026 ISSUED FOR REVIEW DM MS BM
4:1 MAX (TYP)
B 06/10/2026 ISSUED FOR REVIEW DM MS BM
PROPOSED FINISHED GRADE 4:1 MAX (TYP)
C 07/10/2026 ISSUED FOR REVIEW DM MS AK
1370 1370
4:1 MAX (TYP) 4:1 MAX (TYP) D 08/14/2026 ISSUED FOR REVIEW MP MS BM
PROPOSED DRAINAGE BASIN E 10/14/2026 ISSUED FOR REVIEW DM MS BM
1360 1360
0+00 1+00 2+00 3+00 4+00 5+00 6+00 7+00 8+00 9+00 10+00 11+00
PROFILE A (N-S) (SEE SHEET BYW-C-300)
1
H. SCALE: 1" = 80'; V. SCALE: 1" = 10'
1410 1410
FG: FG:
EG:1377.8 EG:1380.4 FG:1382.05 EG:1380.6 FG:1381.81 EG:1379.9 FG:1380.90 EG:1379.8 FG:1379.90 EG:1380.5
1400 1400
PROPOSED ACCESS ROAD
PROPOSED 13' TALL
SCREENING WALL PROPOSED ACCESS ROAD PROPOSED 13' TALL
SCREENING WALL
PROPOSED PROPOSED
1390 BATTERY BATTERY 1390
STORAGE STORAGE
0' 80' 160' 240'
AREA AREA
PROJECT BOUNDARY
PROJECT BOUNDARY 0.35%
-0.87%
-0.95%
1380 1380
4:1 MAX (TYP)
TIE INTO PROPOSED EXISTING GRADE
4:1 MAX (TYP) Ellsworth I
GRADING BY OTHERS
PROPOSED FINISHED GRADE
1370 PROPOSED SWALE PROPOSED DRAINAGE BASIN 1370 Energy Center
City of Mesa, Arizona
Contreras
1360 1360
Padron 0+00 1+00 2+00 3+00 4+00 5+00
Grading Profile Plan
Miguel
AM N-S
10:01
10/21/2026 PROFILE C (N-S) (SEE SHEET BYW-C-300)
1
H. SCALE: 1" = 80'; V. SCALE: 1" = 10'
N:\0077606.00\_CAD\_Civil\0077606.00-GDP-SOUTH.dwg
DATE: 10/14/2026
REV:
SHEET: BYW-C-301 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
1400 1400
PROPOSED 13' TALL
SCREENING WALL
PREPARED FOR:
PROPOSED PROPOSED ACCESS ROAD
ACCESS PROPOSED BATTERY STORAGE AREA
ROAD
1390 PROPOSED 13' TALL 1390 Ellsworth Energy
SCREENING WALL
PROJECT BOUNDARY Center, LLC
PROJECT
BOUNDARY
700 Universe Boulevard
Juno Beach, FL 33408
1380 EXISTING GRADE 1380
1.33%
REVISIONS:
1.20% # DATE COMMENT BY CHK APR
PROPOSED BASIN (BY OTHERS)
1.19% 4:1 MAX (TYP) A 05/14/2026 ISSUED FOR REVIEW DM MS BM
B 06/10/2026 ISSUED FOR REVIEW DM MS BM
C 07/10/2026 ISSUED FOR REVIEW DM MS AK
1370 PROPOSED FINISHED GRADE 1370
D 08/14/2026 ISSUED FOR REVIEW MP MS BM
4:1 MAX (TYP)
E 10/14/2026 ISSUED FOR REVIEW DM MS BM
PROPOSED DRAINAGE BASIN
1360 1360
PROFILE B (E-W) (SEE SHEET BYW-C-300)
1
H. SCALE: 1" = 80'; V. SCALE: 1" = 10'
1410 1410
FG: FG: EG: FG: EG: FG:
EG:1375.5 EG:1372.5 FG:1370.00 EG:1372.5 FG:1376.12 EG:1377.0 FG:1377.34 EG:1377.9 FG:1378.21 EG:1377.9 FG:1378.83 EG:1378.5 FG:1379.28 EG:1378.6 FG:1379.70 EG:1379.2 FG:1380.12 EG:1379.7 FG:1380.53 EG:1380.1 FG:1380.87 EG:1380.3 FG:1381.16 EG:1381.0
1400 1400
PROPOSED ACCESS ROAD
PROPOSED ACCESS ROAD
PROPOSED 13' TALL PROPOSED ACCESS ROAD PROPOSED ACCESS ROAD
SCREENING WALL
PROPOSED PROPOSED 13' TALL SCREENING
BATTERY PROPOSED BATTERY STORAGE AREA PROPOSED BATTERY STORAGE AREA WALL
1390 STORAGE AREA 1390
PROJECT BOUNDARY 0' 80' 160' 240'
PROJECT
BOUNDARY
TIE INTO PROPOSED
GRADING BY OTHERS
0.30%
EXISTING GRADE
1380 0.42% 1380
0.74%
1.10%
4:1 MAX (TYP)
Ellsworth I
PROPOSED SWALE
PROPOSED FINISHED GRADE
1370 1370 Energy Center
4:1 MAX (TYP)
City of Mesa, Arizona
PROPOSED DRAINAGE BASIN
Contreras
1360 1360
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 13+00 14+00 Grading Profile Plan
Miguel
AM E-W
10:01
10/21/2026 PROFILE D (E-W) (SEE SHEET BYW-C-300)
1
H. SCALE: 1" = 80'; V. SCALE: 1" = 10'
N:\0077606.00\_CAD\_Civil\0077606.00-GDP-SOUTH.dwg
DATE: 10/14/2026
REV:
SHEET: BYW-C-302 E