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Quality Assurance Plan Bayshore Development -Weld County, Colorado • Terracon Project No. 25045300 Terracon Type of Test Standard Min. Frequency Specified Value Measurement of As per Geotechnicat 1 test per 50 feet or as As per Geotechnicat Trench Depth Report/ Slurry Wall directed by Report/ Slurry Wall Design Specs Geotechnicat Engineer Design Specs Observation of As per Geotechnicat 1 test per 50 feet or as As per Geotechnicat Bedrock Key Material Report/ Slurry Wall directed by Report/ Slurry Wall Design Specs Geotechnicat 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 pcf 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 Backfili In addition, review of filtration test procedure and results pertorned by GEO-CON will be performed dairy. • 3. Soil-Bentonite (SB) Bac~ll 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 1550% 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 owners representative to GEO-CON. • Final field reports will be submitted on a weekly or bi-weekly basis to the owners representative and to GEO-CON. • Laboratory testing reports will be submitted as completed to the owners representative and to GEO-CON. • A final summary report including alt 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