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EXHIBIT A - continued <br />FUTURE REPLACEMENT CAPABILITY <br />ASSUMPTIONS <br />1) 16-30 MPI perc rate = 250 s.f./bedroom <br />2) 3 bedroom home = 450 gpd design rate <br />3) 3 bedroom x 250 s.f./br = 750 s.f. min. system <br />4) using 3' trenches 750 s.f. = 3' = 250 l.f. <br />5) 250 l.f. x standard 7.5' o.c. = 1875 s.f. _ <br />lawn area required to adequately replace drainfield <br />system (area meeting setbacks) <br />6) bed area required would be 1.5 times the trench <br />square footage or 1.5 x 750 = 1125 s.f. <br />7) 2 septic tanks require additional minimum area of <br />approximately 100 s.f. <br />Therefore, the minimum area needed to adequately replace with a <br />complete trench and tank system meeting minimum sizing standards is <br />1875 + 100 = 1975 s.f. <br />Minimum area for complete bed system is 1125 + 100 = 1225 s.f. <br />In order to generalize presume that if area available for drain - <br />field is less than 1225 s.f., system cannot be adequately replaced to <br />minimum standards. Between 1225 - 1975 s.f., there is some doubt <br />whether system can be adequately replaced. Over 1975 s.f., presume <br />adequate room for replacement, but still will find limitaions which <br />make permanent septic system use questionable. Over 5,000 s.f. - <br />should have room for all future needs. <br />Note that this also presumes no future additions which encroach <br />on drainfield sites and does not account for location of trees, or <br />slopes and other site -specific hindrances. <br />RA = Replacement Area <br />RA = 1225 Total <br />21 <br />26% <br />Cannot Be Re- <br />placed Within <br />Confines of Code <br />1226-1975 Total <br />11 <br />13% <br />Severe Limitations <br />on Repairs <br />Total 83 Listed (includes 1 vacant lot) <br />1976-5000 Total <br />27 <br />32% <br />Major Limitations <br />on Repairs But May <br />Be Feasible <br />5000 Plus Total <br />24 <br />29% <br />Probably Feasibl, <br />to Repair <br />