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Engineered Septic System Report Irerracon Jeremy Winery Property Lodi, California October 1, 2020 Terracon Project No. NA197008 Boring Depth Interval Soil Type Unified Soil (feet) Classification 25.0 Silty sand, fine to medium SM grained, brown, very dense *table taken from the nitrate loading/soil suitability study dated May 7, 2020. Stratification boundaries on the table represent the approximate location of changes in soil types; in situ, the transition between materials may be gradual. The location for each of the borings can be found in Appendix A of this report. 3.2 Percolation Test The percolation tests were conducted in accordance with the requirements of the San Joaquin County Percolation Test Procedure (Form: EHD 42-01-002 Revised 08-23-2011). On March 22, 2019 the shallow boring percolation tests B1 at 3.5 feet bgs and B2 at 3.5 feet bgs were performed. The deep boring B3 at 25.0 feet bgs percolation test was conducted on April 5, 2019. As water remained in the bottom of boring B1, Terracon conducted the percolation test by following Procedure #1. Approximately 0.5 feet of clear water was added above the top of the gravel and the drop in water level was recorded after a 30 minute period. There was no water remaining in the test holes at borings B2 and B3; 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 at thirty 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 for borings B2 and B3 were observed by Mr. Naseem Ahmed, EHD representative. The approximate location of the test hole is indicated on the attached Appendix A. Below is a summary of the percolation test results corrected for a gravel packed hole. Percolation Rate Summary Location Depth, ft Percolation Rate (min/inch) B1 3.5 250 B2 3.5 125 B3 25.0 125 Based on the percolation tests results, the two shallow borings at 3.5 feet bgs failed to achieve a passing percolation rate of 60 minutes per inch or less for standard leachfields. Additionally, the deep boring percolation test at 25 feet bgs failed to have a passing percolation rate of at least 30 Responsive ■ Resourceful ■ Reliable 3