Laserfiche WebLink
Upgradient Contributions of Agricultural Wastes: <br /> The majority of activity upgradient is forage crop farming. There is one potentially large contributor <br /> to groundwater infiltration with nitrates in the form of a dairy. A well water sample(MDS-3W)nitrate <br /> test result(18 ppm) indicates that the ground water conditions is similar to that at the Manuel Da Silva <br /> dairy. A review of the soils map shows that the John Da Silva dairy is located on the same soil type that <br /> the Manuel Da Silva dairy farm is located on. That is#193, Madera Sandy Loam. The majority of the <br /> property of the John Da Silva dairy appears to be located on soil type# 157, Exeter Sandy Loam, a similar <br /> soil. <br /> Rainfall impact: <br /> The rainfall in the general area is approximately 15"per year. The area is considered to be arid. The <br /> soil is considered to be"moderately well drained". In consideration of the conditions of the soil profile <br /> (clayey layers with slow percolation rates of 1.2E 10"5 cm/sec) , it is safe to say that down gradient <br /> groundwater contamination from rainfall at the Manuel Da Silva dairy is not likely. On the other hand, <br /> surface water with agricultural waste could reach the Lone Tree Creek from the dairy and farm if the <br /> current drain system is not improved. The surface runoff can reach the Lone Tree Creek which is <br /> approximately 3/4 mile to the north of the Manuel Da Silva farm. <br /> If the waste water from the Manuel Da Silva lagoon were to percolate laterally downgradient at the rate <br /> of 1.2E10"5 cm/sec, it will take 106.31 years to travel 1/4 mile. This does not take into consideration any <br /> variable that are somewhat unpredictable, such as extremes in rainfall or extremes in evaporation from <br /> periods of drought. <br /> 12 <br />