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KLEINFELDER similarities in soil conditions and rainfall, we have chosen to use the same values deemed appropriate by Mr. Hantzsche for the project in Morada. The primary difference is that the Lone Tree Subdivision involves only one residence per 10 acres. With such a small amount of waste water applied per acre it is understandable that the nitrate loading is very low even using the worst case assumptions. Our calculations are as follows. Low Estimate Nc = 1 (2)(40)(1—.25)+(3)(2.2) .1(2)+3 6+6.6 =3.9me/lasN 3.2 High Estimate 1 (2) 60 (1 - .1)+3 (2.2) .1(2)3 10.8 +6.6 =5.4mg/l asN 3.2 One of the values needed to complete a nitrate loading study is the existing value of nitrate in the groundwater below the site. Based on our discussions with Mr. Huggins, we have been advised to use a background nitrate (NO,) concentration of 10 mg/l in the groundwater. While Mr. Huggins did not provide a background level of nitrate as N in the groundwater, based on previous testing by our firm the value of nitrate as N compared to NO, is usually about 25 percent. In other words, if 10 mg/1 is expected for NO,, the initial or background level of nitrate as N might be expected to be on the order of 2 to 3 mg/l. As explained earlier, the Hantzsche equation computes N,which is the calculated nitrate concentration in groundwater resulting from domestic sources and precipitation N in units of mg/1 N. With the low and high range of 3.9 to 5.4 mg/l (N) we conclude that the placement of 6 residential structures of the 10-acres parcels of the Lone Tree Subdivision will not cause a rise of nitrate levels about State standards. XI. ADDITIONAL SERVICES The review of plans and specifications, field observations, and testing by Kleinfelder, Inc. are an integral part of the conclusions and recommendations made in this report. If Kleinfelder, Inc. is not retained for these services, the client agrees to assume Kleinfelder, Inc.'s responsibility for any potential claims that may arise during construction. The required tests, observations, and consultation by Kleinfelder, Inc. during construction include,but are not necessarily limited to: 20-4280-01.601/20198150 Page.10 of 12 April 14, 1999 Copyright 1999 Kleinfelder,Inc.