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(7) Where more than one tank is used to obtain the <br />required liquid volume, the tanks shall be <br />connected in series. <br />(8) No more than four tanks in series can be used <br />to obtain the required liquid volume. <br />(9) The first tank shall be no smaller than. any <br />subsequent tanks in series. <br />3. Aerobic Tanks <br />a. Aerobic tank treatment systems shall comply with the <br />following design requirements: <br />(1) The treatment system including each individual <br />unit or compartment shall be easily accessible <br />for inspection and maintenance and shall be <br />provided with secured covers. <br />(2) The raw sewage flow from the dwelling. shall be <br />intercepted by a trash trap prior to its entering <br />the aeration compartment. The trash trap shall <br />have a net holding capacity of not less than 20 <br />percent of the average daily flow. The invert <br />level to the trap shall be above the liquid level <br />and discharge directly into the trap. The outlet <br />from the trap to the aeration compartment shall be <br />deep baffled or equipped with a.tee or long ell. <br />(3) The trash trap shall, be readily accessible for <br />inspection and effective cleaning and shall be so <br />-constructed as to prevent unaiuthorized entry. <br />(4) The aeration compartment shall have a minimum <br />holding capacity of .five hundred.gillons or one <br />hundred twenty gallons per bedroom, whichever <br />is greater. <br />(5)• The method of aeration shall be accomplished by <br />mechanical aeration, diffused air, or both. The <br />method used shall maintain aerobic conditions <br />at all times. <br />-29 <br />