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, <br /> A verfical separation of at least three feet is required be#ween the bottom of the rock <br /> bed and any restricting tayer in order to maintain aerobic cor�ditions and treat the <br /> wastewater. When aerobic conditions e�ast in the clean sand, the long�erm acceptance <br /> rate wi�! be 1.2 gaftons per day per squane€aot If the depth to the nestriding layer is <br /> inadequate or the rock l�ed is too wide, anaerobic conditions may exist and cause a <br /> much siower acoeptance�ate.The possibility of anaerobic conditions occurring in the <br /> dean sand, and subsequent hydraulic failure, is a major design consideration when <br /> mounds farger than those required for singte-#amily residences ane requi�ed. <br /> Mound construc�ion begins with the layer of dean sand, whic� must be at least one-foot <br /> thick. The top of the dean sand layer must be level, as must the rodc layer which is <br /> placed upon the dean sand tayer. Distributian pipes are ptaoed in the Gean rodc.A <br /> sandy loam cap, six inches thidc at the side and 12 inches thidc at the center, is ptac�c! <br /> aver the rock layer: Mounds should be located on slopes whenever possible, because <br /> as slope increases, the ability of the topsoil to accept and treat wastewater inq�+eases. <br /> mmc sbpe:3:t <br /> c�taiive �Rg°r' �� <br /> recorm�ded:4:1 �'r�11 sarxf ccg� <br /> ������ �€��� perf�ised lolei+d <br /> �aR�< < R � _«« .� <br /> .�«� �«�c� °��� ��«<€� ��« <br /> t =LLr=iCCLt .LCCCttt L[f .. <br /> [C��L�C�Ct�tC KCKc�Ct�Cc[`RLC CKtLtry� tSCiL C i CCQte�cRC � <br /> Li�K�[[CiCts� `sees�e4aeesis�s uf���V�eiit' �taR�esss� titCCLtti��i <br /> ��Ci[LC�T6C � KL[�CCCiLL LC te LiL�4itiC <br /> Kiic � � EEri�'.�__'s _..�cm[� �� cs�e�a�e�seiriiu <br /> . GCiKtCCLLCC[t'K G'���� '.`LCtt[C iCCK[e.iC�iiiCt�fiL e TiCti�[�CL�L <br /> i :KC`L�ilCCQiLt"c[ccc.t.[[tt`l�t[ CL`�LRK��R� � <br /> C C�C[![cftc.C.iCC[LCttt LQtt j SC <br /> at least 12'of nottatd soN """` 6.�� <br /> tirr�tir�g iayer <br /> rou�ned layer <br />