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Soil Suitability/ Nitrate Loading Study Irerracon Eagle's Nest Motorcycle School Stockton, California July 27, 2021 Terracon Project No. NA217040 usage rates were calculated based on the maximum number of employees and visitors expected during peak business hours. Table 4. Expected On -Site Maximum Septic Tank Usage Gallons per day (GPD) The maximum daily flow rate for the existing facility operations is approximately 55 gpd. The septic system design should be based on the San Joaquin County On -Site Wastewater Disposal Standards or other engineering recommendations. 1.4 Groundwater Information 1.4.1 Groundwater Depth and Gradient Groundwater was not encountered within our borings which were drilled between 3.5 and 25.0 feet bgs. According to the California Department of Water Resources Sustainable Groundwater Management Act (SGMA) Data Viewer, in Spring 2020 depth to groundwater was reported between approximately 50 to 60 feet bgs. Based on a review of the California Department of Water Resources Well Completion Report Map Application, two former groundwater monitoring well abandonment records (WCR2012-06461 and WCR2012-06462) were reported on the site. Static water level was not reported in the records; however, the notes indicate the wells were grout backfilled. Terracon reviewed the State Water Resources Control Board GeoTracker website for additional information regarding the former groundwater monitoring wells. Based on a review of the records for Canteen Corporation (T0607700568), 1500 North Shaw Road, Two former groundwater monitoring wells (MW -8 and MW -9) were located on the northern portion of the site. The groundwater monitoring wells were associated with a leaking underground storage tank release at 1500 North Shaw Road. Depth to groundwater was reported between approximately 41.5 and 64.5 feet bgs in the on-site monitoring wells. A No Further Action / Closure letter for the facility dated January 2013 indicated groundwater flow direction was reported to the south-southwest. The groundwater flow direction and the depth to shallow, unconfined groundwater, if present, would likely vary depending upon seasonal variations in rainfall and other hydrogeological features. Without the benefit of on-site groundwater monitoring wells surveyed to a datum, groundwater depth and flow direction beneath the site cannot be directly ascertained. Responsive ■ Resourceful ■ Reliable 7 Maximum Septic Number Number of Employee Visitor Septic Tank System Building ID Hours of Employees Effluent E Number Visitors Effluent Usage No. Operation per day (x15 GPD) per day (x5 GPD) Employee per day GPD + Visitor GPD Proposed 1 Motorcycle 8 2 30 5 25 55 Storage Building Total Max GPD 55 Gallons per day (GPD) The maximum daily flow rate for the existing facility operations is approximately 55 gpd. The septic system design should be based on the San Joaquin County On -Site Wastewater Disposal Standards or other engineering recommendations. 1.4 Groundwater Information 1.4.1 Groundwater Depth and Gradient Groundwater was not encountered within our borings which were drilled between 3.5 and 25.0 feet bgs. According to the California Department of Water Resources Sustainable Groundwater Management Act (SGMA) Data Viewer, in Spring 2020 depth to groundwater was reported between approximately 50 to 60 feet bgs. Based on a review of the California Department of Water Resources Well Completion Report Map Application, two former groundwater monitoring well abandonment records (WCR2012-06461 and WCR2012-06462) were reported on the site. Static water level was not reported in the records; however, the notes indicate the wells were grout backfilled. Terracon reviewed the State Water Resources Control Board GeoTracker website for additional information regarding the former groundwater monitoring wells. Based on a review of the records for Canteen Corporation (T0607700568), 1500 North Shaw Road, Two former groundwater monitoring wells (MW -8 and MW -9) were located on the northern portion of the site. The groundwater monitoring wells were associated with a leaking underground storage tank release at 1500 North Shaw Road. Depth to groundwater was reported between approximately 41.5 and 64.5 feet bgs in the on-site monitoring wells. A No Further Action / Closure letter for the facility dated January 2013 indicated groundwater flow direction was reported to the south-southwest. The groundwater flow direction and the depth to shallow, unconfined groundwater, if present, would likely vary depending upon seasonal variations in rainfall and other hydrogeological features. Without the benefit of on-site groundwater monitoring wells surveyed to a datum, groundwater depth and flow direction beneath the site cannot be directly ascertained. Responsive ■ Resourceful ■ Reliable 7