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Soil Suitability / Nitrate Loading Study 1rerracon <br />Ehlers Property Lodi, California <br />May 13, 2021 Terracon Project No. NA217019 <br />1.5.4 Discussion of Soil Lithology <br />The soils encountered in our soil borings consisted primarily of silty sands. Generally speaking, <br />coarse-grained soil has a greater potential for percolation than fine-grained or cemented soil. <br />Terracon searched the DWR online Well Completion Records for additional information regarding <br />soil lithology near the site. A well completion report was available for a nearby address of 10500 <br />West State Route 12. Soils were reported as topsoil/peat from 0 to 6 feet bgs, fine black sand <br />from 6 to 15 feet bgs, blue clay from 15 to 17 feet bgs, black sand from 17 to 19 feet bgs, and <br />stratified layers of blue clay, medium black sand, and coarse black sand to 160 feet bgs. <br />1.6 Percolation Test Information <br />1.6.1 Percolation Test Locations <br />Refer to Section 1.5.1 and Appendix A, Exhibit 2. <br />1.6.2 Number of Percolation Tests <br />Two percolation tests (131 and 133) were performed. <br />1.6.3 Boring Preparation and Presaturation <br />The percolation test borings (61 and 133) were excavated on April 19, 2021. Approximately two <br />inches of "pea gravel" was placed in the bottom of the open borings. A 2.0 -inch diameter PVC <br />pipe with perforations towards the bottom was installed on top of the gravel and the annular space <br />was backfilled with "pea gravel". Presaturation of the percolation test holes occurred the same <br />day approximately 24 hours prior to the day of testing. The depth of water used to pre-soak the <br />shallow borings was approximately 1.0 foot above the top of the gravel. <br />1.6.4 Condition of Borings after Presaturation <br />Borings 131 and B3 were dry and intact after the 24-hour pre-soak period. <br />1.6.5 Percolation Test Procedure <br />Percolation tests were conducted for the two borings on April 20, 2021 in accordance with the <br />requirements of the San Joaquin County EHD. Each percolation test had a duration of four hours. <br />The last half an hour of the test was observed by Mr. Naseem Ahmed of the EHD. Measurement <br />of the water level during the percolation tests was from a fixed reference point on the PVC casing <br />using a calibrated Solinst electric water level detector with a depth accuracy of 0.01 feet. All <br />tabulated values on the field data sheet (Appendix E) are in decimal feet. After water drop was <br />observed, the holes were checked for refill. The holes were refilled as necessary to maintain <br />Responsive Resourceful Reliable 10 <br />