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Exhibit A Multi-Modal Station/Shopping Center Phase II ESA Page 5 contamination at the properties. Soil samples will be collected from 4, 8, and 12 feet bgs at each boring. The two boreholes completed to approximately 75 feet bgs will be left open during the day to collect depth to groundwater measurements once the groundwater has stabilized. The three soil samples collected from each boring will be composited and analyzed for VOCs by EPA Method 8260. Apparent contamination will introduce the need for additional borings estimated at 20% of the original number. Contamination noted in the laboratory results will require discrete soil sample analysis at approximately 20% of the borings. The discrete soil samples will be analyzed for VOCs by EPA Method 8260, semi-VOCs by EPA Method 8270, and total petroleum hydrocarbons by EPA Method 8015M. In addition, each of the discrete soil samples taken from a depth of four feet bgs will be analyzed for LUFT-5 metals by EPA Method 6010B. Groundwater samples will be analyzed for VOCs by EPA Method 8260 (on-site mobile laboratory). Visually apparent contamination will introduce the need for additional borings estimated at 10% of the original number of borings to approximately 75 feet bgs. Analyses will be conducted at an off-site laboratory. Subtask 4 — Block 4 Borings Nine soil borings will be completed on the site designated Block 4. Four borings completed to 12 feet bgs and two to approximately 75 feet bgs will be installed at 701 E. Weber Avenue. Three soil borings completed to twelve feet bgs will be installed at 729 E. Weber Avenue. Groundwater and soil samples will be collected to help assess the potential contamination at the properties. Soil samples will be collected from 4, 8, and 12 feet bgs at each boring. The two boreholes completed to approximately 75 feet bgs will be left open during the day to collect depth-to- groundwater measurements once the groundwater has stabilized. The three soil samples collected from each boring will be composited and analyzed for VOCs by EPA Method 8260. Apparent contamination will introduce the need for additional borings estimated at 20% of the original number. Contamination noted in the laboratory results will require discrete soil sample analysis at approximately 20% of the borings. The discrete soil samples will be analyzed for VOCs by EPA Method 8260, semi-VOCs by EPA Method 8270, and total petroleum hydrocarbons by EPA Method 8015M. In addition, each of the discrete soil samples taken-from a depth of four feet bgs will be analyzed for LUFT-5 metals by EPA Method 6010B. Groundwater samples will be analyzed for VOCs by EPA Method 8260 (on-site mobile laboratory). Visually apparent contamination will introduce the need for additional borings estimated at 10% of the original number of borings to approximately 75 feet bgs. Analyses will be conducted at an off-site laboratory. Subtask 5 — Block 5 Borings Twenty-nine Geoprobe soil borings will be completed on the site designated Block 5. Four borings will be completed to 12 feet bgs at 820 E. Channel Street. Three soil borings completed to 12 feet bgs will be installed at 815 E. Weber Avenue. Three soil borings completed to 12 feet bgs will be installed at 829 E. Weber Avenue. Seven borings completed to 12 feet bgs will be installed at 811 E. Weber Avenue. Five borings to 12 feet bgs and one to approximately 75 feet bgs will be installed at 843 E. Weber Avenue. One boring to approximately 75 feet bgs will be installed at 805 E. Weber Avenue. Two borings completed to 12 feet bgs will be installed at 836 E. Channel Street (APN 139-280-04 and 139-280-05). One boring completed to 12 feet bgs will be installed at each of the following sites: 144 N. Grant Street, 814 E. Channel Street, and 147 N. Aurora Street. Groundwater and soil samples will be collected to help assess the potential