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L <br /> LNovember 9,2005 <br /> NOA Project Number: E05118B <br /> L Page 5 <br /> soil suitability study. <br /> LPotential ground-water contamination can occur from a number of sources which often include <br /> leaky underground storage tanks,agricultural activities,dairies,septic systems, and storm water <br /> infiltration. Any past agricultural activities and the present use of septic systems in the area should <br /> Lbe considered potential ground-water contamination sources. Please see section 4.4 for additional <br /> water quality details. <br /> L4.3 Water Sample Location Y`D X U <br /> According to A#nd <br /> stionnaire signed by Kathy Reinstein on September 20,20 , no wells <br /> Lexist on the Si :Two wertnits were found for the address 99 Blewett Road. One pe t or <br /> the installation o e the other for the repair of a well.The address on the permit may have <br /> L been incorrect because after a site inspectio , ells o septic systems appeared to exist on the <br /> property.A five acre parcel with the addre s Ol st ewett Road,APN 255-180-12,belonging to <br /> Mary Thomsen may have been the correct a e for the installation of this well. The installation <br /> location also appears to be on the parcel 255-180-12 according to the location diagram depicted on <br /> No water sample was taken. <br /> L4.4 Water Sample Constituents <br /> L No water sample was taken for the subject property,therefore no water quality information is <br /> available.The following information describes water quality information about the vicinity of the <br /> subject property and what may be expected if a well is to be installed and then tested on the Site. <br /> L The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin County <br /> and other parts of the Central Valley. Nitrate in ground water occurs as a result of the application <br /> L of fertilizers,livestock waste, and untreated septic tank waste. Nitrate is mobile and often �— <br /> accumulates in the shallow ground water zones. <br /> In the early 1900s,natural levels of nitrate in ground water were measured in forty-three (43)wells <br /> L throughout the Sacramento Valley by Bryan (1923). It was thoughteater at that time <br /> was close to"natural" conditions. Based on the work by Bryan,it is ted t _ er"natural" <br /> conditions,ground water concentration containing nitrate is no more then ab 013.5 mg NO3 (3 <br /> L mg/L-N). Areas having 24.75 mg/L-NO3 (5.5 mg/L-N) or more are those in w m—Eate <br /> concentrations may be increasing(Hull, 1984). <br /> L <br /> L <br /> L 5 .,44 <br />