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Septic tanks store the accumulated sludge, scum and effluent (clear zone) volumes, which in turn affect treatment of nitrogen within the tanks. Although there are differing methods to size septic tanks for a project, tank capacity based on Average Daily Flow will be used: The peaking factor is typically taken to be three for commercial projects based on a "peak day" since the majority of flow will occur daily during the spring and summer months. =Additionally;�lo-oper`ate as a p]ug flow° M .reactor, the volumetric septic tank capacity should be approximately 5x,the ADR 5 x 375 = 1;875x,, gallons.-Therefore,.sufficient septic tank capacity exists withone -„2,000 gallon tank and a"450)' gallon pump chamber: There must bean effluent filter t(FPV)"at the outlet of the septic tank before the effluent gravity flows into the pump chamber.”?The pump chamber tank will also have a"built- in" filtration system around the duplex pump system. The 2,000 gallon tank is to trap and settle any solids that may flow from the lift stations even though the sewage pumps will have a filter surrounding the lift station sewage pumps. Detention Time: Detention Time= 2,450 gal total tank ca acit .x 0.70 30% volume lost to sludge/scum accumulation 3 (Peaking factor) x 375 gals/day(ADF) Detention Time= 1.5 days. The minimum acceptable detention time is 1.0 day. B. MOUND SYSTEM SITE PREPARATION The followingcalculations ons are for a mound system to serve the Bullfrog Landing Marina facility. Pursuant to EHD requirements, the pumping system for the effluent disposal will consist of a quu_Pj✓x pbmp-arrangement,'with the alternating pumps r General Construction Notes for the mound installation are found in the Cali ornia State Water Resources Control Board- Guidelines Lor the Design, Installation and Operations of Mound Sewage Disposal Systems, and the EPA Desi,-n Manual - On Site Wastewater Treatment and Disposal Systems. The location of the mound system is outlined on the Page 1 the Plans, and is proposed to be in the southeast corner of the landside of the property. The mound will be constructed perpendicular to ,groundwater.-flow direction,'which is predominately.in an east to west direction. A 100% replacement area is designated to be directly north of the constructed mound system. Prior to the commencement of any and all construction activities, the proposed mound disposal area must be cordoned off to prevent soil compaction by equipment driving over the area. At the start of mound construction, the native soil/sand media interface must be properly prepared. The native soil basal area must-stripped of all native vegetation and then rippedto a-deptb of 8.12 Tenches. Soil moisture content at the time of ripping is critical and the soil should not be too wet or too dry. Ripping can be perpendicular to groundwater flow, which would be north-to-south, only to be within the area of the sand/native soil interface.'Aft Ff plowink and:before emplacement of 'the sand media, it is imperative that no equipment be driven over this area. 14 Chesney Consulting