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Soil Suitability / Nitrate Loading Study Irerracon Jeremy Winery Lodi, CA May 7, 2019 Terracon Project No. NA197008 1.6 Percolation Test Information 1.6.1 Percolation Test Locations Refer to Section 1.5.1 and Appendix A, Exhibit 2. 1.6.2 Number of Percolation Tests Three percolation tests (131, B2, and 133) were performed. 1.6.3 Boring Preparation and Presaturation The shallow soil borings (131 and 132) were excavated on March 21, 2019. The deep soil boring (133) was excavated on April 4, 2019. Approximately two inches of"pea gravel" was placed in the bottom of the open boring. A 2.0-inch diameter PVC pipe with perforations towards the bottom was installed on top of the gravel and the annular space was backfilled with "pea gravel". Presaturation of the percolation test hole occurred approximately 24 hours prior to the day of testing. The depth of water used to pre-soak the shallow borings was approximately 1.0 foot above the top of the gravel and approximately 0.5 feet above the top of the gravel for the deep boring. 1.6.4 Condition of Borings after Presaturation The three borings were intact after the 24-hour pre-soak period. Water remained in the bottom of boring 131 after the presoak period. Borings B2 and B3 were found to be dry after the presoak period. 1.6.5 Percolation Test Procedure 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 131 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 61, 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 133; 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 Responsive ■ Resourceful ■ Reliable 11