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B. REPLACEMENT AREA CALCULATIONS FOR EXISTING 2 BEDROOM SFR, 3 BEDROOM MOBILE HOME AND PROPOSED 3 BEDROOM MODULAR HOME. If replacement areas for all three residential structures were to be composed of filter bed effluent disposal structures, the total area required would be: Two bedroom SFR: 200 ft LL x 3 (Soil Factor Multiplyer) = 600 sf filter bed Three Bedroom Mobile Home: 300 ft LL x 3 = 900 sf filter bed Three Bedroom Modular Home: 300 ft LL X 3 = 900 sf filter bed Total square footage required = 600 + 900 + 900 = 2,400 s£ As illustrated on the aerial photo in Appendix F, 3,100 sf of filter bed replacement area is denoted, accounting for 10 ft separation distances between filter beds. Setbacks from the onsite and adjacent property domestic wells is also illustrated. V. CONCLUSIONS AND RECOMMENDATIONS SSS§ 5.4, SSS§ 6.7. The soils underlying the disposal area for the proposed modular home exhibit comparatively rapid permeability, and although the soils possess 17% clay, this rapid permeability is commonly observed in the Tracy area. Given: 1.) The application area to be installed for the proposed structure, 2.) The low historical evidence of repairs/replacements/ additions to surrounding onsite wastewater treatment systems, and 3.) The rapid soil permeability, longevity of the onsite systems can be considered significant. NLS§ 4.2. From the soil physical and chemistry test results, and the aforementioned particle size analysis of 17% clay, a denitrification potential of 30% was used in the nitrate loading calculations. The loading calculations demonstrate that the accessory unit dwelling (third unit dwelling) can be situated on the property without exceeding the nitrate loading standards. Septic tank pump - out intervals should be every two to three years to remove the nitrogen within the septage. The perc test results of 8.3 min/inch translates to an application rate of 0.800 gals/ft2/day. Using the ADF of 200 gpd: 200 gpd - 0.800 gals/ft2/day = 250 sf required to manage the ADF. 300 Lineal Ft of Leachline (LFLL) = 300 LFLL x 4 sf/ft = 1,200 sf of application area is to be installed to serve the proposed modular home. The 100% replacement/reserve area is adequately situated to the north of the primary disposal area, and is also adequate to serve as replacement areas for the two existing structures. Accurate "as-builts" of the onsite wastewater treatment system shall be supplied to the Environmental Health Department. Although the leachlines are proposed to be installed in a corral area, there are no rules or regulations precluding disposal area installations within a confined animal area. Any future replacement area installed outside of the corral area cannot be parked upon or driven over. It is imperative to recognize that all septic systems and disposal areas have a lifespan. This lifespan is unpredictable due to the numerous operational and environmental factors involved. A critical lifespan issue is controlling and restricting the domestic water use as much as possible. Chesney Consulting