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2020 ANNUAL GROUNDWATER MONITORING REPORT TEICHERT AGGREGATES AND GRANITE CONSTRUCTION VERNALIS AREA 1 INTRODUCTION Luhdorff and Scalmanini,Consulting Engineers(LSCE) has prepared this 2020 Groundwater Monitoring Report on behalf of Teichert Aggregates(Teichert) and Granite Construction Company(Granite)for their quarry excavation operations in the Vernalis area of southern San Joaquin County, California (Figure 1). Teichert's plant is located at 36314 South Bird Road,Tracy, CA 95304 (Figure 2).The Teichert Plant operates under Quarry Excavation No. QX-91-5 for Teichert Vernalis Central (previously referred to as Lone Tree) and PA-0500847 for Teichert Vernalis West and East.Teichert Vernalis Central mining commenced in 1998 and West and East commenced in 2014. Granite's plant is located south of the Teichert Vernalis Central property at 37400 South Bird Road,Tracy, CA 95304. Granite's plant operates under its Revised Conditional Use Permit for Quarry Excavation and Excavation Plan No.QX-94-1 (Granite's permit)and its approved Groundwater Monitoring Plan (LSCE, 2009). Phase I mining commenced in late 2007. All phases of the excavation are permitted for dry pit operations.The maximum mining depth at the Teichert Vernalis Central and Granite facilities shall not exceed 150 feet below ground surface (bgs)and the Teichert Vernalis West and East mining depths will reach approximately 225 feet bgs.Actual allowed mining depths may be reduced by San Joaquin County based on groundwater level elevation data developed by the monitoring program. Between 1995 and 2008,Teichert submitted annual groundwater monitoring reports for compliance purposes for its Teichert Vernalis Central (Lone Tree)excavation operations.Starting in 2009, comprehensive groundwater monitoring reports have been prepared to satisfy both Teichert's and Granite's permit requirements related to groundwater monitoring and reporting activities. LUHDORFF&SCALMANINI CONSULTING ENGINEERS