1994-006290 - replace septic - Laserfiche WebLink

Home Browse Search

1 . . Design irements October 8, 1992 L___ • Considering the soils data and minimum design requirements of the Septic System Ordinance, our proposal is as follows: uws: Construct a Mound System based on a water usage of 600 gallons per day, fe.rI 4 Bedroom Type I . 6*^ gpd x . 83 sq. ft . pgpd = 498 sq. feet bed area-minimum design size Proposed Design Size 10 x 50 bed = 500 sq. ft bed area. 2- 10()0 gal . pre-cast tanks, + 1- 1000 gal . pump tank. , ConstructionProcedure For A Sewage Treatment Mound Soil Surface Preparation A 2 inch discharge pipe from the pump to end of the mound area shall be installed prior to soil surface preperation. The trench excavated to install the discharge pipe shall be carefully backfilled and compacted to prevent sepage of effluent . , The total area selected for the Mound, including that under the dikes, shall be roughened in order to thoroughly break up any existing sod layers and to provide a suitable transition zone between the original soil and the sand layer of the mound. The area shall be roughened only when the moisture content of, the soil 8 inches below the surface is drier than the plastic limit . The plastic limit is the soil moisture content below which the soil may be manipulated for purposes of install a soil treatment system, and above which manipulation l cause compaction and puddling. Surface preparation or scarification will be performed with a back-hoe bucket . There shall be no dead furrow in the mound construction area. Mound construction shall proceed immediately after surface preparation is completed. Every effort should be taken to prevent rain from falling on the prepared soil surface. • Construction Materials & Distribution of Effluent A clean washed sand layer shall be placed where the filter (rock bed) material is to be located. This sand layer_ must be at least 18- incies deep and should be deep enough to level area for m . A crawler tractor with a blade or bucket shall be use to move the sand into place. At least 6 inches of sand sh ll be kept under the tracks to minimize compaction of the s arified layer . The sand layer upon which the filter ma erial is placed shall be level from side to side and end to end. Only clean sand is to be used.