LABORATORY REPORT GEOTECHNICAL / ENVIRONMEAL / MATERIALS ENGINEERS 3331 EAST WOOD STREET, PHOENIX, ARIZONA 85040 Physical Properties of Soils and Aggregates Client: Pace Pacific Corp. ATTN: Sean Moore 3731 East University Dr. Phoenix, Arizona 85034 Project No. Lab No. Field No. Report Date: 151208TS 449609 449609 8/7/2015 Project: Location: Material: Source: Supplier: GRAVELLY LEAN CLAY (CL) Import WMAT Sample Location: ABHS Whiteriver Campus 264 W. Ponderosa St., Whiteriver, Arizona Embankment at Stego Pit Sampled By: Client Submitted By: SMK Authorized By: Client Date: Date: Date: 8/5/2015 8/5/2015 8/5/2015 SIEVE ANALYSIS Ariz 201 SIEVE SIZE in/mm 6" / 150 100 3" / 75 100 2 1/2" / 62.5 88 2" / 50 88 1 1/2" / 37.5 88 1" / 25 85 3/4" / 19 83 1/2" / 12.5 78 3/8" / 9.5 76 1/4" / 6.3 73 #4 / 4.75 71 #8 / 2.36 68 #10 / 2.00 67 #16 / 1.18 66 #30 /.600 #40 /.425 #50 /.300 #100 /.150 #200 /.075 CUMULATIVE % PASSING 64 62 61 60 57.8 PROJECT SPECIFICATION 100 30 MIN Comments: denotes material not tested for this property ADDITIONAL TESTING PHYSICAL PROPERTIES TEST RESULTS LIQUID & PLASTIC PROPERTIES; AASHTO T89 & T90 Liquid Limit 26 Plastic Limit 14 Plasticity Index 12 ph & RESISTIVITY OF SOIL & AGGREGATES; Ariz 236b ph Value of Soil & Aggregate Minimum Resistivity of Soil & Aggregate CHLORIDES IN SOIL; Ariz 736 Chlorides (ppm) SULFATES IN SOIL; Ariz 733 Sulfates (ppm) RVALUE; AASHTO T190 RValue @ 300 psi MOISTURE COE OF SOIL; AASHTO T265 Percent Moisture of Dry Aggregate LOS ANGELES ABRAISION; ASTM C131/AASHTO T96 100 Rev/500 Rev TARGET/ SPECIFICATION * denotes material out of specification FRACTURED FACE One or More/Two or More Copies to: Addressee (1) Laboratory test results reported herein apply only to the specific sample on which the test was run. The above services and report were performed pursuant to the terms and conditions of the agreement or proposal, if any, between SA and client. SA warrants that this work was performed under the appropriate standard of care, including the skill and judgement that is reasonably expected from similarly situated professionals. No other warranty, guaranty, or representation, either express or implied is included or intended. SIEVE4 CLASSIFY 151208TS.GPJ GENLAB.GDT 8/7/15 Reviewed by Laboratory Manager

LABORATORY REPORT GEOTECHNICAL / ENVIRONMEAL / MATERIALS ENGINEERS 3331 EAST WOOD STREET, PHOENIX, ARIZONA 85040 Physical Properties of Soils and Aggregates Client: Pace Pacific Corp. ATTN: Sean Moore 3731 East University Dr. Phoenix, Arizona 85034 Project No. Lab No. Field No. Report Date: 151208TS 454820 454820 10/14/2015 Project: Location: Material: Source: Supplier: Sample Location: ABHS Whiteriver Campus 264 W. Ponderosa St., Whiteriver, Arizona SILTY, CLAYEY GRAVEL (GCGM) Import WMAT Stockpile on site Sampled By: Submitted By: Authorized By: RDS RDS Client Date: Date: Date: 10/13/2015 10/13/2015 10/13/2015 SIEVE ANALYSIS Ariz 201 ADDITIONAL TESTING SIEVE SIZE in/mm 6" / 150 3" / 75 2 1/2" / 62.5 2" / 50 1 1/2" / 37.5 1" / 25 3/4" / 19 1/2" / 12.5 3/8" / 9.5 1/4" / 6.3 #4 / 4.75 #8 / 2.36 #10 / 2.00 #16 / 1.18 #30 /.600 #40 /.425 #50 /.300 #100 /.150 #200 /.075 CUMULATIVE % PASSING 100 74 50 43 33 32 31 28 27 26 25 24 23 23 22 21 20 19 *17.2 PROJECT SPECIFICATION 100 30 MIN PHYSICAL PROPERTIES LIQUID & PLASTIC PROPERTIES; AASHTO T89 & T90 Liquid Limit 26 Plastic Limit 19 Plasticity Index 7 ph & RESISTIVITY OF SOIL & AGGREGATES; Ariz 236b ph Value of Soil & Aggregate Minimum Resistivity of Soil & Aggregate CHLORIDES IN SOIL; Ariz 736 Chlorides (ppm) SULFATES IN SOIL; Ariz 733 Sulfates (ppm) FRACTURED FACE; ARIZ 212b Percent Fractured Face TEST RESULTS LOS ANGELES ABRASION; ASTM C131, AASHTO T96 Percent Loss @ 100 Revolutions Percent Loss @ 500 Revolutions TARGET/ SPECIFICATION Comments: denotes material not tested for this property * Denotes material out of specification SAND EQUIVALE VALUE; AASHTO T176 Average Sand Equivalent Copies to: Addressee (1) Laboratory test results reported herein apply only to the specific sample on which the test was run. The above services and report were performed pursuant to the terms and conditions of the agreement or proposal, if any, between SA and client. SA warrants that this work was performed under the appropriate standard of care, including the skill and judgement that is reasonably expected from similarly situated professionals. No other warranty, guaranty, or representation, either express or implied is included or intended. SIEVE4 CLASSIFY 151208TS.GPJ GENLAB.GDT 10/14/15 Reviewed by Laboratory Manager