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New F&C Borba Dairy <br /> Holding Pond Sizing and On-Site Soil Characteristics <br /> June 5, 1999 <br /> Page 2 <br /> Volume (ft ) = (LW x LL x LD) - [(S x LD 2) x (LW+LL)] + (4 x S2 x LD' - 3) <br /> Storage Volume (ft ) _ (121 x 646 x 23) - [(1 x 23 2)x 121 + 646)] = (4 x 12 x 23' —' 3) <br /> _ (1,797,818) - (405,743)+ (16,223) <br /> = 1,408,298 cubic feet <br /> = 10,534,069 gallons <br /> From the Holding Pond Sizing Worksheet, 840,520 cubic feet of storage is required (estimated) <br /> and the pond will be constructed with a 1,408,298 cubic feet capacity. This water balance does <br /> not take into consideration unusually wet winters, evaporation, water infiltration and percolation, <br /> or discharge during weather-favorable intervals during the 120 day storage period. <br /> ON-SITE SOIL CHARACTERISTICS <br /> A backhoe test pit was excavated in the proposed area of the holding pond to assess the <br /> subsurface soil characteristics. The top three feet of soil consists of a black clay. From four to <br /> six feet is a dark reddish brown silty clay, also with a stiff and compacted texture. Beginning at <br /> six feet and extending to approximately 10 feet is a very tight, reddish brown cemented silts <br /> hardpan, which has excellent slope stability. Below 10 feet and extending to 15 feet is a light <br /> brown silt stratum. <br /> From these observed soil characteristics, it is our opinion that the top 10 feet of subsurface soil <br /> possesses sufficient strength to be excavated to a 1:1 slope. However, below 10 feet, the slope <br /> may have to be increased to 2:1 due to the erosion potential of silt material. This will have to be <br /> determined by the earthwork contractor as the material is excavated. It is imperative that the top <br /> three feet of clay material be stockpiled in the event it is needed as a clay liner on the floor of the <br /> holding pond. It is our understanding that the embankments will be built up five feet above <br /> existing grade. Material from three feet to ten feet may be used for the above-grade <br /> embankments provided it is deposited in the proper lifts and compacted under near optimum <br /> moisture content. <br /> If there should be any questions regarding the information presented above, please contact the <br /> undersigned. <br /> Respectfully submitted, <br /> VALLEY AG RE ARCH <br /> 12�tt �Z W7 <br /> Don Chesne , R.E.A. <br /> `Tlaffey JV*.search <br />