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- [61 Cont. <br /> Also, the number of Permit Applications for additional leachline indicates a larger leachfield should <br /> be installed. <br /> For any development, the size or number of bedrooms the new structure will have should also be <br /> taken into consideration for the final design of the leachfield. For example, a four bedroom house <br /> should have between 8,000 and 10,000 square feet of leachfield area. A 50% standby replacement <br /> area must also be incorporated into the design. The referenced leachfield areas will help ensure <br /> stability and guard against leachfield failure. A failure would primarily result from the formation of <br /> a "biomat" or "clogging mat" on the wetted soil where the effluent enters the soil. This mat is <br /> composed mostly of aerobic and anaerobic bacteria and bacterial products consisting of a slime of <br /> polyuronides and polysaccharides. If the soil/effluent interface is well aerated, a variety of soil <br /> microfauna such as nematodes and protozoa may digest the clogging mat bacteria. This type of <br /> biological activity will probably prevail due to the sandy nature of the percable strata. <br /> With respect to the protection of the underlying groundwater from pathogens and nitrates (NOA the <br /> depth to groundwater (55 ft) and the low density of housing can be considered favorable for <br /> prevention of nitrate contamination. However, agricultural practices have influenced the nitrate <br /> groundwater concentration. Well logs on file at the Environmental Health Department indicate there <br /> are sufficient clay layers between grade and the depth to groundwater to have some attenuation effect <br /> on the downward migration of nitrate molecules. <br /> yew L <br />