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Soil Suitability I Nitrate Loading Study 1rerracon ALL STAR HEAVY HAUL & TOWING INCORPORATED Tracy, California July 1, 2022 Terracon Project No. NA217024 Additionally, the total maximum daily septic tank usage for the on-site residence was calculated based on the EHD recommended daily use rate of 70 gallons per day (gpd) per person for a total of 280 gpd. Table 4. Proposed Commercial On -Site Maximum Septic Tank Usage Gallons per day (gpd) Expected On -Site Maximum Septic Tank Usage Number of people per Average effluent Average Average Effluent Maximum Proposed quantity per person Shift Number of Quantity per Septic Tank Septic Phase / Shift Hours Shift Times Employees Employee Usage System Total 280 per shift (gpd) I Phase I / Shift 1 9 8:00 AM — 5:00 PM 1 16.875 16.875 Total Maximum Daily Flow Rate for Proposed Septic System 1 16.875 Gallons per day (gpd) Expected On -Site Maximum Septic Tank Usage ' Gallons per day (gpd) The total maximum daily flow rate for Phase I and proposed Septic System 1 is 16.81-5 gpd. The residence is anticipated to add 280 gpd for a combined total of 297 gpd maximum. 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 soil profile boring which was drilled approximately 25 feet below ground surface (bgs). Groundwater was not encountered in our percolation test borings which was advanced between approximately 3.5 and 25 feet bgs. According to the California Department of Water Resources Sustainable Groundwater Management Act (SGMA) Data Viewer, depth to groundwater was reported approximately 17 bgs in 1996. According to the Department of Water Resources (DWR) Water Data Library, a well located approximately 0.55 miles west of the site had historic depth to groundwater levels ranging from 205.3 feet bgs to 249.6 feet bgs, another well located approximately 0.90 miles east of the site had historic depth to groundwater levels ranging from 156.6 feet bgs to 282.8 feet bgs, and a third well located approximately 2.15 miles northwest of the site had historic groundwater levels ranging from 87.5 feet bgs to 165 feet bgs. Responsive ■ Resourceful ■ Reliable 8 Number of people per Average effluent Maximum Septic Residence Number of bedrooms bedroom quantity per person Tank Usage (gpd.) (gpd*) Existing 2 2 70 280 Total 280 ' Gallons per day (gpd) The total maximum daily flow rate for Phase I and proposed Septic System 1 is 16.81-5 gpd. The residence is anticipated to add 280 gpd for a combined total of 297 gpd maximum. 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 soil profile boring which was drilled approximately 25 feet below ground surface (bgs). Groundwater was not encountered in our percolation test borings which was advanced between approximately 3.5 and 25 feet bgs. According to the California Department of Water Resources Sustainable Groundwater Management Act (SGMA) Data Viewer, depth to groundwater was reported approximately 17 bgs in 1996. According to the Department of Water Resources (DWR) Water Data Library, a well located approximately 0.55 miles west of the site had historic depth to groundwater levels ranging from 205.3 feet bgs to 249.6 feet bgs, another well located approximately 0.90 miles east of the site had historic depth to groundwater levels ranging from 156.6 feet bgs to 282.8 feet bgs, and a third well located approximately 2.15 miles northwest of the site had historic groundwater levels ranging from 87.5 feet bgs to 165 feet bgs. Responsive ■ Resourceful ■ Reliable 8