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Page 4 <br /> Soil Suitability And Nitrate Loading Evaluation Pa g <br /> Pa-0600569 <br /> 17200 Byron Road (APN # 209-150-23) <br /> Tracy, California <br /> January 14 2008 20-18.89 <br /> Quadrangle ( p" CDMG Ma Sheet 5A, 1991) indicates the site to be underlain by the <br /> Quaternary geologic age "Alluvial Fan Deposits" which consists of gravel, sand, silt and <br /> clay. <br /> t Our assessment indicates the site to be generally underlain by soils considered consistent <br /> with those shown on published mapping as described above. Soils, consistent with <br /> alluvial fan deposits, encountered within the depth of exploration for this project are <br /> described as dark brown clay to 2.5-ft depth and light brown to brown silty clay <br /> interbedded with thin layers of silt to maximum explored depth of about (3.5-ft depth). <br /> a <br /> 8.0 PERC0LXMN TESTING <br /> i The test ho (P-1) as exp mated n February 26, 2007 at/near the proposed lcach�field <br /> area as sh non ttached Figure 2. The percolation test was performed in general <br /> canfarmari e wi "Test Me od 2" (per San Joaquin County Environmental Health <br /> Department (SJEHD) Document 42-02-002 8/7/02), and the last 30-minutes of testing <br /> was observed by an inspector from the SJEHD. Percolation test data is presented in <br /> FtAppendix B. <br /> The percatation test utilized a 6.0-inch diameter test hole was excavated to a depth of <br /> abou44-i llches and drain pipe (5-inch diameter), slatted within the lowermost 6-inches, <br /> plac�hin the hole. Pea gravel was used at the base and annular space to limit i <br /> sloughing of the boring walls. Preliminary information was obtained by adding 12- <br /> F, inches of potable water, no water remained in the hole after the 60 minutes. <br /> F, <br /> E Observation of percolation testing was scheduled with SJEHD for 3/2107 and pre-soaking <br /> I of the test hale was initiated at 3:11 pm on 311107 by adding 12.0 inches of potable water. <br /> The following morning (3/2/07) at' 9:12 am no water remained in the test hole. <br /> Percolation testing was performed on 3/2/07 from 9:14 am to 2:01 pm with last thirty <br /> minutes inspected by Ted Tasiopoulos (SJEHD).Results of the test are shown in the <br /> table below: <br /> F414F <br /> U <br /> yrs. d �TESTNI$IR ' �LEPTH,:.ftE FE.a <br /> P-1 3.5 20 <br /> A copy of ur­fie�lderc latio.n test results, signed by a represenafive from SJCEHD, is <br /> provided n Appendix B. <br /> 9.0 NITRATE LOADING CALCULATIONS <br /> ' Per SJEHD requirements, the following summarizes our nitrate loading talcKations for <br /> the proposed leach field. The state drinking water standard for nitrate is 45 milligrams <br /> per liter (NO3) and 10 mg/l as Nitrogen (N) in groundwater. Presented below is our <br /> f <br /> T: <br />