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r7Bycreasing the buffering capacity of the septic tank,this will allow the effluent receiving soilsnage small, low flows from sink usage, hand/dishwashing, etc. But more importantly, the buffering of large inflows such as toilet, shower/bath, and laundry will occur. This increase buffering capacity will allow the small porosity receiving soils to manage the effluent and prevent saturated flows. This buffering phenomenon is described in a paper by Nicolas Forquet and Matthieu Dufresne; Simple Deterministic Model of the Hydraulic Buffer Effect in Septic Tanks in which they state: "Under [typical household water usage] testing shows that the septic tank may help ensure a better spreading of the hydraulic load over the day." Section 7.1.3. Calculations are presented in the Conclusions Section"showing the ability of the effluent to meet discharge standards as set by the EHD." By buffering the effluent flows as referenced,the soil will accept a 0.1 gals/sf/day acceptance rate. Section 7.1.4. The sources of data for my justifications are referenced above, and in my Report that pertains to both the primary and replacement disposal areas. Section 7.1.5. The shallow percolation tests were conducted by Live Oak Geo Environmental. The perc rates can be written on the plans. The expansion area equal in size to the original primary disposal area is noted on the plans. In summary, by increasing the septic tank size 33%,thus increasing the buffering capacity of the tank 33% but keeping the projected low flow volumes emanating from the two bedroom manufactured homes,will facilitate the effluent receiving soils to manage the flow volumes. As a reminder to the septic system contractor, the perforated drain pipe shall be laid level within the leachline trenches with the tight line from the ends of the drain pipe elevated four inches to connect with the seepage pit perforated pipe. Respectfully submitted, Qiofessio CHESNEY CONSULTING y��o�D Cbe 00 OG No.75A79 Don Chesney,PE Registered Civil Engin er#C75479 `rfa Civil �+ fe Of Cali4o�4 i I Page 2 of 2 Chesney Consulting