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Soil Suitability / Nitrate Loading Study <br />Ernst Property ■Tracy,CA <br />February 21, 2019 revised April 9, 2019 ■ Terracon Project No.NA197000 <br />Responsive ■Resourceful ■Reliable 9 <br />Boring Depth Interval (feet)Soil Type Unified Soil <br />Classification <br />2.5 to 3.0 <br />Silty sand with clay, fine <br />to medium grained, <br />brown <br />SM <br />B2 <br />0 to 2.5 Lean clay, fine grained, <br />brown CL <br />2.5 to 3.58 <br />Silty sand with clay, fine <br />to medium grained, <br />brown <br />SM <br />1.5.4 Discussion of Soil Lithology <br />A visual inspection of the shallow silty sandy soils with clay points to favorable conditions for <br />shallow septic disposal areas between approximately 3.0 and 3.5 feet bgs. Generally speaking, <br />coarse-grained soil has a greater potential for percolation than fine-grained or cemented soil. <br />Terracon searched the Department of Water Resources online Well Completion Records for <br />additional information regarding soil lithology within 0.5 miles of the site. The following four water <br />supply wells were identified nearest the site. <br />WCR Number Latitude Longitude Depth Approximate Distance/Direction <br />from Site <br />WCR0181249 37.744965 -121.513773 340 550 feet / Northwest <br />WCR1985-002634 37.743611 -121.503889 400 2,200 feet / East <br />WCR2017-007307 37.738056 -121.511667 200 1,650 / South <br />WCR2000-001395 37.743889 -121.515556 455 835 feet / West <br />Based on a review of the Well Completion records, the soils within the vadose zone (40 to 60 feet <br />bgs) are comprised of alternating sand and/or clay strata which extends to depths of 455 feet bgs. <br />Refer to Appendix G for copies of the Well Completion records. <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 />One percolation test (B1) was performed.