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7TracyBoulevard, sting to note that high nitrate well water was also observed in a well at the south end of which is to the north of the subject property. There is a beef cattle ranch adjacent sracy Boulevard well which may or may not be contributing to the nitrate found in this well. It is unlikely that nitrogen from a small volume of horse stock waste could produce an amount of ' i nitrogen sufficient enough to impact the well to this degree. And, it is my underst 'ng that the grain crops grown in this area were never fertilized with nitrogen. Therefore thd'hi nitrate concentrations found in these wells at the base of the Diablo Range could be�& mg from geological and atmospheric sources. Ms. Cheatwood is planning to manage the horse manure by sprea ing the material over the pasture areas of her ranch, crossgradient and downgradient tot on-site ell. Given that the total Parcel acreage is approximately 314 acres, this is a significant o of land area to spread a comparatively low volume of horse manure. In addition, manure originating in the new horse barn 1 will be easily gathered and since the structure will be covered, downward nitrogen migration from hydraulic rainfall pressure will not occur. As depicted on the Site Plan, the topography of the site consists of rolling hills, although in the area of the proposed leachfield,-the topography is relatively flat with a slight inclination to the west. Septic system design criteria-for slopes do not have to be considered. ��l r . (§ 3-t,'3.2,3.3,3.4, 3.5, and 3.6) As referenced, there are currentlytt tic systems on the property with the horse barn to make four systems. The subject property is in area designated as "Hard Pan"by EHD's map denoting the various soil types and septic system_requ' throughout the County. Because of the depth to the water table as noted below,' 75-85 feet deep septic system structures such as sumps and seepage pits are allowed to be install t cale` A review of Application Permits on microfiche file at EHD reveals there have been no i Applications for Repairs/Additions/Replacements to septic systems within the one-half mile radius study area. However, in discussions with Ted Tasiopoulos, R.E.H.S., it was his recollection that there was a repair to one of the on-site residential systems. This low number of repairs can be , attributed to not only the extremely low building density within the study area, but also the indigenous permeable soil type that is found predominately at typical leachline and sump depth and confirmed through percolation testing. (§ 5.1 and 6.0) SOIL PROFILE AND PERCOLATION TESTING i (§ 5.4) The USDA Soil Map shows the on-site soil to consist of Zacharias gravelly clay loam (#282). Typically, these soil types are well drained with moderately slow permeability. Siow _ `~ permeability was not observed from the percolation testing whereby the on-site soils revealed a high degree of permeability. Sufficient soil "fines"exist within the soil profile to impede extremely rapid percolation, which would occur with a sandy soil. Therefore, treatment of septic effluent can take place within this soil environment before reaching the water table. Treatment is typically regarded as destruction of bacteria and viruses. Page -2- Chesney Consulting