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Soil Suitability/Nitrate Loading Study Irerracon Soares Property■ Escalon, CA December 13, 2019 is Terracon Project No. NA197095 2011). There was no water remaining in the test holes and less than 0.5 feet of water drained from the test hole within the first 30 minutes of the test; therefore, Terracon conducted the percolation tests by following Procedure #2. Terracon added clear water approximately 0.5 feet above the top of the gravel and recorded the drop in water level in 30-minute intervals over a four hour period. Measurement of the water level during the percolation test was from a fixed reference point on the PVC casing using a calibrated Solinst electric water level detector with a depth accuracy of 0.01 feet. All tabulated values on the field data sheet are in decimal feet. The percolation test was observed by Ms. Daria Afonskaia, Registered Environmental Health Specialist. 1.6.6 Percolation Test Forms and Results A shallow percolation test is defined by the EHD as being between 36 and 42 inches in depth. While a deep percolation test is defined by the EHD as being between 42 inches and 25 feet in depth. The shallow percolation test must demonstrate a satisfactory percolation rate of less than or equal to 60 minutes per inch drop in water level within the existing septic system disposal field of a parcel to utilize a standard septic system and 30 minutes per inch or less for septic pits. Details of the percolation tests are summarized in the table below. Table 7. Summary of Percolation Test. Test No. Percolation Test Percolation Rate Comments Date Tested Depth(feet) (minutes/inch) Test Duration (see notes) B3 3.25 50 4 hours Satisfactory Percolation Rate 11/22/2019 11/22/2019 B6 3.16 35.71 4 hours Satisfactory Percolation Rate Note: A satisfactory percolation rate is 60 minutes per inch or less for shallow leach lines and 30 minutes per inch or less for septic pits per SJEHD,Onsite Wastewater Disposal Standards,October 2003. The completed percolation test form with Ms. Afonskaia's verification signature is included in Appendix E of this report. 1.6.7 Discussion of Percolation Test Results Based on the percolation tests results, Boring B3 at 3.25 feet bgs and Boring B6 at 3.16 feet bgs achieved a passing percolation rate of less than 60 minutes per inch and greater than 1.0 minute per inch required for standard leach fields. Boring B3 is 78 feet from a neighboring well (28442 E. Lemon Avenue). Ms. Afonskaia advised that the onsite septic system be built over 100 feet from the neighboring well and onsite well. 1.6.8 Discussion of Septic System Sizing Responsive ■ Resourceful ■ Reliable 11