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Poorly maintained systems: <br />i) Not pumped ort regularly, allowing solids to clog <br />drainfield lines. <br />ii) Baffles not replaced as they decay, with same <br />result as above. <br />iii) Construction of encroaching hardcover onto or near <br />drainfield, causing excess runoff into drainfield <br />lines. <br />Poorly designed systems: <br />i) Tank capacities extremely small for 1960's water use <br />habits. <br />ii) Single tank systems of inadequate capacity or <br />retention times to treat the current flows. <br />iii) Drainfields with inadequ;. ydraulic capability <br />to dispose of current flows, due to small drainfield <br />size or natural biomat buildup due to age of system. <br />Poorly located systems: <br />i ) Drainfields and no.z-sealed tanks located near or <br />within high water tabl:-s, causing premature :system <br />failures. <br />ii) Drairifirids located near hardcover which drains <br />excess surface runoff onto the drainfield. <br />3. Extent of Existing Problems <br />In order to give a clear representation of the status of <br />existing systems, each sub -area will be briefly discu.?ed. <br />J <br />