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<br />compartments, not less than one-half nor more <br />than two-thirds of the total volume shall be in <br />the first compartment. <br /> <br />c. When a septic tank is divided into three or more <br />compartments, one-half of the total volume <br />shall be in the first compartment and the other <br />half equally divided in the other compartments. <br /> <br />d. Connections between compartments shall be <br />baffled so as to obtain effective retention of <br />scum and sludge. <br /> <br />e. Adequate venting shall be provided between <br />compartments by baffles or by an opening of at <br />least 50 sq inches near the top of the <br />compartment walls. <br /> <br />f. Adequate access to each compartment shall be <br />provided by one or more manholes, at least 18 <br />inches least dimension, and located within 6 <br />feet of all walls of the tank. The manhole cover <br />shall be covered with at least 6 inches of earth. <br /> <br />15. Multiple tanks <br /> <br />a. Where more than one tank is used to obtain the <br />required liquid volume, the tanks shall be <br />connected in series. <br /> <br />b. Each tank shall comply with all other provisions <br />of these regulations. <br /> <br />c. No more than 4 tanks in series can be used to <br />obtain the required liquid volume. <br /> <br />d. The first tank shall be no smaller than any <br />subsequent tanks in series. <br /> <br />16. Outlet pipe from septic tank <br /> <br />21 <br />