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The denitrification capacity of the soil is predominately dependant upon the abundance of an organic carbon substrate (which is comparatively high), high soil moisture content leading to an anaerobic environment, and a high soil pH of 7.8. Saturated soil conditions will develop near the soil/effluent interface. There should be sufficient organic carbon substrate from the wastewater and an alkaline soil pH may further promote denitrification. The following Table illustrates the soil analytical test results. Additionally, as will be discussed in Section II.C.1., groundwater l samples were also taken from the backhoe test pit, with the results listed underneath the Soil Nitrogen Content. As expected, the nitrate concentration in the groundwater under the high nitrate-nitrogen soil is significantly higher than the groundwater nitrate concentration under the soil with a much lower nitrate-nitrogen concentration. TABLE 2 'RO €6 sOI al ,F'ILE C� RACTERISTICS AND x 9 a8u�c �R#€a s - S4 3=i€ z<€£ "»-., __ i4 ANALYTICAI�TESTESUL' ' aOR`NITRAT"E"NITROGN"3 �PARCEhI, SOIL DESCRIPT'IOi�T� SANT),€SLLTA�iD CLAY; SOILNITROGN'CONTETT . 3€ � ,'q�s € ' � €a¢el�I GRO I�DVVAT R 6, I'EI,2CENTGESa� ,��: ;: E €sae SI�s.. :f" 1€ E . a6 •„%a'7i LO.G r I I(N 1V I'w<R T CONTENT e.� $ €a<#r 9 a° ..mLa .: "3°a ¢r -(:•.0 .'' 1 g, 5• C4•eFF Parcel 2: Sandy Loam 55%,30%, 15% 38 ppm NO3-N Sample No._ 38 IN.Depth (165 ppm NO,) Future L.F. Parcet2: Sandy Loam 59%,22%, 19% 46 ppm NO3-N Sample No. _ 8FT Depth (165 ppm NO,) Future L.F. Parcel 3: Loam 47%,26%,27% 3 ppm NO3-N Sample No. _ PAR 3 (8 ppm NO3) (42 inch depth) Future L.P. 2. PERCOLATION TESTING AND SEPTIC SYSTEM PARAMETERS Percolation testing was performed in accordance with San Joaquin County Department of Environmental Health regulations. Test borings for parcels 2 and 5 were drilled February 1 I with a four-inch diameter hand auger. Two inches of pea gravel and a three inch perforated pipe was placed in each boring. Twelve inches of tap water was then poured in each boring. The same procedures were used for the perc tests on parcels 1, 3 and 4, with the perc test borings hand- drilled on March 4 and perc tested March 5. All test borings were dry and the holes intact at the start of the testing. The attached Site Plans denotes the location of the percolation tests and the FIELD PERCOLATION TE5TING REPORT illustrates the perc test results, which are summarized in the Table below. 5 Chesney Consulting