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_During.the drilling of the exploratory borings, very moist-to-wet soil conditions-were observed, <br /> _thus creating thepotential for an anaerobic environment. This high soil moisture condition can be <br /> r <br /> . attributed'to,the high amount of water thatis used in growing rice. <br /> - ­�NL 11: In addition.to the analytical chemistry completed on the soil samples, Particle Size <br /> An lysi was also done on the exploratory samples as denoted on the Soil Analysis Reports. These <br /> = soils ave been classified by A&L Laboratory under the United States Department of Agriculture- <br /> Natural Resources Conservation Service (USDA-MRCS) classification(e.g., sandy loam, loam, <br /> etc.). The Unified Soil Classification System (USCS - e.g., lean clay, silty clay CL-MLICL)has <br /> -- been`used on each of the EHD Percolation Test Rate Field Forms to identify the soil as <br /> encountered in the test borings for each respective Parcel. <br /> Nitrogen in septic tank effluent consists of approximately 75%N in the ammonium ion(NH4+) <br /> --- form and 25%N in the organic form. If the ammonium ion is bound and eventually utilized by <br /> microorganisms,nitrificatiob i cannot occur. The pH, along with the Cation Exchange Capacity. <br /> = -(CEQ)-have significant influence on ammonium. The CEC measures the ability of the soil to <br /> `theoretically-trap;hold and convert ammonium.molecules. Soil profiles from the deep westside <br /> (P2) exploratory borings have a low CEC'of 7.5,while the CEC from the eastside (P5)borings is <br /> somewhat higher at approximately I L These CEC capacities should slightly increase the retention <br /> of ammonium molecules for microbial uptake'and suppression of nitrification. <br /> SSS§ 5.2;5A,-5:4 The test results for the important constituents contributing to nitrate formation <br /> are tabulated and summarized in Table 1 below."In addition;the soil texture descriptions from <br /> each sample depth are also denoted-for comparison purposes. <br /> TABLE 1 <br /> '- ..SELECTED SOIL PROFILE DATA UNDER <br /> M . _ .LAND.AREA`OF-,PROPOSED PARCEL 2 and;PARCEL'5 <br /> Soil Sample Depth and Nitrate-Nitrogen Soil Soil Description <br /> 1. Location -_ Concentration pH/CEC Texture <br /> loft 6 ppm 7.917:5 56%Sand <br /> Under Proposed Parcel 2 20%Silt Sandy Clay Loath <br /> Sample ID:P2-10 _ 23%Clay <br /> 25 ft 6 ppm 8.017.5 76%Sand <br /> Under Proposed Parcel 2 _ 10%Silt Sandy Loam <br /> Sample ID:P2=25 13%Clay <br /> :40 ft 7 ppm 7.7111.8 50%Sand <br /> Under Proposed Parcel 5 26%Silt Sandy Clay Loam <br /> Sample ID:P5=10 232%Clay <br /> 25 ft 5.ppm 7.7!10.5 54%Sand _ <br /> Under Proposed Parcel 5 24%Silt Sandy Clay Loam <br /> Sample ID:P5-25 21%Clay <br /> Page -3- <br /> Chesney Consulting <br />