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[5] Cont. <br /> Agency (EPA) guidelines from the publication Practical Guide for <br /> Ground-Water Sampling (EPA/600/2-85/104) . Analytical procedures <br /> were also conducted under EPA regulations. The results can be <br /> found in the Appendix and indicate a medium level of nitrate <br /> concentration (NO3) at 17 mg/l. This nitrate concentration <br /> indicates that there has been a low level impact upon the <br /> groundwater under the subject property from either agricultural <br /> practices, or from septic systems. No concentrations of DBCP nor <br /> EDB were detected in the retrieved sample. <br /> [6] CONCLUSIONS <br /> Although each proposed parcel of the subject property has excellent <br /> percolation rates for the deep test borings, (except Parcel #4) , <br /> it is recommended that a 12 , 000 square foot leach field area be <br /> utilized for each of these four parcels. This recommendation is <br /> based upon the fact that the percolation tests were performed in <br /> the general area of where a septic system may be installed in the <br /> future. Additionally, the extensive hardpan under the subject site <br /> is not conducive for effluent percolation; therefore, a greater <br /> leaching area must be utilized. <br /> The sand strata encountered during the exploratory and deep <br /> percolation test borings is very favorable for the percolation of <br /> sewage effluent. Consequently, seepage pits or sumps must be <br /> utilized on each of the four parcels. There is to be a minimum of <br /> 40 feet of leach line between the septic tank and the pit, unless <br /> there is approval of deviation from the Environmental Health <br /> Department. The pit must have a minimum diameter of 33 inches and <br /> be installed to a maximum depth of 25 feet. <br /> As noted above, the water table is approximately 84 feet below <br /> grade. Therefore, the groundwater level in this area is <br /> 5 <br /> E) <br /> *.ity cont.1 Inspection <br />