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lrerracon Soil Suitability / Nitrate Loading Study Buddhist Temple Proposed Dormitory • Stockton, California July 11,2019 • Terracon Project No. NA177056 Well File Number Location Depth (feet) 03N06E31 017446 Thornton Road, south of Devries Road, end of road west side 400 03NO6E31— _43093 Thornton Road, IA mile north of Eight Mile Road, % mile west side 170 03N06E31 22652 _ Thornton Road, % mile north of Eight Mile Road, west side 515 Based on a review of the Well Completion records, soils in the vadose zone (0 to 20 feet bgs), consist primarily of clay, sand, and/or silty sandy clay strata. Refer to Appendix G for copies of the Well Completion records. 1.6 Percolation Test Information 1.6.1 Percolation Test Locations The percolation tests were conducted on the northern portion of the site in the vicinity of the proposed leach field. Refer to Section 1.5.1 and Appendix A, Exhibit 2. 1.6.2 Number of Percolation Tests Two shallow percolation tests B1 and B2 were conducted on May 10, 2019. 1.6.3 Boring Preparation and Presaturation Two soil borings were excavated to a depth of 3.5 feet bgs on May 9, 2019 using a 4.0-inch diameter hand auger. Approximately six 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. Pre-saturation consisted of a water column approximately 1 foot over gravel on the same day. 1.6.4 Condition of Borings after Pre-saturation May 10, 2019, after the initial 24-hour pre-saturation period, both borings were found to be dry and intact on the day of testing. 1.6.5 Percolation Test Procedure Terracon followed EHD percolation test procedure #2 as both borings were dry after the 24 hour pre-saturation period. The percolation tests had a duration of four hours and readings were recorded every 30 minutes. 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. A copy of the field data is included in Appendix E. Responsive • Resourceful • Reliable 12