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§ 6.2, 6.3 and 6.5 On December 14, 2021, four shallow perc test borings were hand-drilled in the <br />locations as illustrated on the Tentative Map (Appendix B). Two inches of gravel was placed at <br />the bottom and a three-inch perforated PVC pipe was inserted into each test boring. The borings <br />were then pre-saturated with 12 inches of clean water. <br />§ 6.4 On December 15, 2021, 0800 hrs, percolation testing commenced. There was no standing <br />water after the 24-hour soak period in any of the four test borings, as illustrated in Table 1 below. <br />Consequently, EHD Perc Test Procedure #2 was conducted. <br />§ 5.4 and 6.8 The following Table illustrates the applicable data obtained from the percolation <br />tests. <br />TABLE 1 <br />PERCOLATION TEST RESULTS AND RELATED DATA <br />PROPOSED PARCEL ACREAGE PERC TEST <br />DEPTH POTENTIAL SEPTIC <br /> POST SOAK <br />PERIOD STATUS <br />PERC TEST <br />RESULTS SYSTEM STRUCTURE <br />PARCEL 1 <br />Leachlines or Filter Beds <br />2.16 ac. 42 in. No Standing Water in <br />Test Boring <br />19.2 min/in <br />PASSING <br />PARCEL 2 <br />Leachlines or Filter Beds <br />2.16 ac. 40 in. No Standing Water in <br />Test Boring <br />17.9 min/in <br />PASSING <br />PARCEL 3 <br />Leachlines or Filter Beds <br />2.55 ac. 38 in. No Standing Water in <br />Test Boring <br />13.9 min/in <br />PASSING <br />PARCEL4 <br />Leachlines or Filter Beds <br />2.00 ac. 39 in. No Standing Water in <br />Test Boring <br />13.2 min/in <br />PASSING <br />§ 4.0 LOCAL GROUNDWATER AND SURFACE WATER INFORMATION <br />§ 4.1 The Spring 1999 Lines of Equal Depth Maps published by the San Joaquin County Flood <br />Control illustrates groundwater depth to be 20 ft below ground surface (bgs). This depth to the <br />water table can be considered the highest anticipated depth to groundwater. <br />§ 4.3, 4.5, 4.6, 4.4 The on-site domestic well water was tested by Precision Enviro-Tech Labs. <br />The test results and chain of custody are found in Appendix C. The water analysis results reveal a <br />high nitrate-nitrogen concentration in the domestic well of 9.35 ppm. The Maximum Contaminant <br />Level (MCL) for nitrate nitrogen in drinking water is 10 ppm. DBCP/EDB was non-detect (ND). <br />A summary of the test results are illustrated in Table 2, below. <br />Page -3- <br />Chesney Consulting