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Soil Suitability / Nitrate Loading Study Ernst Property ■ Tracy, CA Irerracon February 21, 2019 revised April 9, 2019 ■ Terracon Project No. NA197000 Table 3. Summary of Adjoining Property Septic Permits. Leach Tank Size Leach Line Line Seepage Pits, Direction Address Permit# Type (Gallons) Quantity Length Sumps,Filter (Feet) Beds,Other Northwest 23352 S. Hansen Rd 81-619 New Install 1,200 3 80 --- Northeast 23355 S.Tsirelas Dr 82-650 New Install 1,200 3 80 --- East 16303 Diablo Ct 86-1274 New Install 1,600 3 100 --- SR0073407 Repair --- 1 100 --- Southeast 16312 Diablo Ct 85-1551 New Install 2,000 4 40 Four 4'x8'pits South 16338 Diablo Ct 86-778 New Install 2,000 4 100 --- SR0066761 I Replace tank 2,000 --- --- --- South 16352 Diablo Ct 86-779 New Install 2,000 4 100 --- Southwest 16366 Diablo Ct 86-1202 New Install 2,000 4 100 --- West 16343 Diablo Ct 85-184 New Install 12,000 14 100 --- Based on a review of the EHD permits, the septic systems in the area appear to utilize standard leach lines. Leach lines are primarily 100 feet in length. One of the properties utilizes 40 foot long leach lines with seepage pits approximately 8 feet in depth. 1.3.6 Septic Repair Permit History in the Vicinity Septic repairs in the vicinity appear to be for replacement of septic tanks and the addition of leach lines. The septic repair permits can be found in Appendix C of this report. 1.3.7 Expected On-Site Maximum Septic Tank Usage The site is currently developed with a 3,119 SF five bedroom residence with septic system and is proposed to be developed with an approximately 1,400 SF three bedroom two bathroom mobile home and additional septic system. Per conversations with EHD representatives, 70-gallons of waste per person/day with an average potential occupancy of two persons per bedroom was used to calculate maximum septic tank usage of 1,120-gallons per day which includes 700 gallons per day for the existing residence plus 420 gallons per day for the proposed residence. Refer to Section 2.3.4.1. 1.4 Groundwater Information 1.4.1 Groundwater Depth and Gradient Groundwater was not encountered in our percolation test holes excavated to a depth of 3.5 feet below grade surface (bgs) on February 5, 2019. According to the San Joaquin County Flood Control and Water Conservation District Groundwater Report (SJCWCD) Lines of Equal Depth to Groundwater Spring and Fall 2015 to 2016, groundwater depth lies between approximately 40 and 60 feet bgs. The groundwater flow direction and the depth to shallow, unconfined groundwater, if present, would likely vary depending upon seasonal variations in rainfall and other Responsive■ Resourceful ■ Reliable 6