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Quality Assurance Plan Bayshore Development -Weld County, Colorado Terracan Project No. 25045300 Terracon Type of Test Standard Min. Frequency Specified Value Measurement of As per Geotechnical 1 test per 50 feet or as As per Geotechnical Trench Depth Report/ Slurry Wall directed by Report/ Slurry Wall Design Specs Geotechnical Engineer Design Specs Observation of As per Geotechnical 1 test per 50 feet or as As per Geotechnical Bedrock Key Material Report/ Slurry Wall directed by Report/ Slurry Wall Design Specs Geotechnical Engineer Design Specs 2. Bentonite Slurry To Maintain Open Trench Stability Type of Test Standard Min, Frequency Specified Value Viscosity (at mixer) 1 per shift 40 secs minimum Density (at mixer) 1 per shift >= 64 pct Viscosity (in trench) 1 per shift 40 secs minimum API Spec. 136-1 >= 64 pcf and a Density (in trench) 1 per shift minimum of 15pcf lighter than SB Backfill In addition, review of filtration test procedure and results performed by GEO-(:ON will be performed tlaily. 3. Soil-Bentonite (SB) Backfill Type of Test Standard Min. Frequency Specified Value Density API Spec. 13B-1 1 per shift At least 15pcf heavier than slurry in trench Slump ASTM C143 1 per shift 3 to 6 inches Gradation' ASTM D 1140 1 per 2,000 linear feet 15-50% passing No. 200 sieve Permeability' ASTM D 5084 1 per 2,000 linear feet 1x10- cm/sec or less 'Laboratory Test 4. Reporting • Preliminary field reports will be submitted daily to the owner's representative to GEO-CON. • Final field reports will be submitted on a weekly or bi-weekly basis to the owner's representative and to GEO-CON. • Laboratory testing reports will be submitted as completed to the owner's representative and to GEO-CON. • A final summary report including all field and laboratory testing will be prepared and submitted to the owner's representative, GEO-CON, and the Division of Minerals and Geology (DMG) as requested. 2