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Cover - Hay, a permeable plastic fabric, loamy sand backfill <br /> and topsoil shall be used to cover the system as shown in <br /> details E3 and E14 . <br /> Tanks - The capacity of the primary and secondary septic <br /> tanks and of the pumping tank are listed in the bill of <br /> materials. The grade on the house sewer should be 1 foot <br /> per 100 feet. The tank shall be equipped with a pump as <br /> specified in the bill of materials. The pump shall be <br /> actuated by a mercury float switch, as shown in attached <br /> detail F13, that will turn the pump on when 25% of the <br /> estimated daily flow plus the drainback quantity of effluent <br /> are above the lowest 18 inches in the tank and will turn the <br /> pump off when 18 inches of effluent remain in the tank. The <br /> pump will be supported on concrete block such that the top <br /> of the pump will be just below the lowest 18 inches of <br /> effluent in the tank. An alarm will be located at a <br /> conspicuous place inside the home and will warn using both <br /> light and sound when the effluent reaches 3 inches above the <br /> pump turn on level. A reserve capacity as specified, shall <br /> be provided in the tank above the alarm actuation level . <br /> The details of the pump and pumping tank are illustrated in <br /> attached detail F7 . <br /> If we may be of further assistance in evaluating this data, <br /> kindly contact us at your convenience. <br /> Sincerely, <br /> ADVANCE SURVEYING & ENGINEERING CO. <br /> James H. Parker P.E. & L.S. <br /> Minn. Lic. No. 9235 <br /> PCA No. 208 <br /> President <br /> Attachments: <br /> Design Sheet; Bill of Materials; Details C11, C7, F17, F7, F13 , <br /> E12 , E15, E14, and E3 ; Boring Logs; Percolation Tests and Site <br /> Plan <br />