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July 24,2003 <br /> Job Number: LG03-201 <br /> Page 4 <br /> Water samples were taken from the outside water spigot located closest to the well by <br /> Eric Rowley of our office on July 11, 2003. The spigot is located on the northwest side of the (i���� ✓ <br /> driveway. The water spigot was allowed to run until cool water flowed. Samples for the <br /> nitrogen anylisis was collected in a plastic container. Samples for the DBCP were collected in <br /> glass jars, filled to the top without air bubbles. The water samples were immediately taken to (�s) ✓ <br /> Precision Analytical in Stockton. The chain of custody for the samples is attached to this report <br /> in the Appendix. The laboratory analyses results show that both nitrates and <br /> Dibromochloropropane(DBCP) are not detected in the water samples obtained from the subject (V-4) ✓ <br /> •. property. <br /> Table 3. <br /> Summary of Nitrogen Tested. <br /> Type of Nitrogen Tested Method DLR Unit Result Analysis Date <br /> Nitrate as N(NO3-N) EPA 300 0.04 mg/L ND 7/11/2003 <br /> Nitrate as N(NO2-N) EPA 300 0.04 mg/L 1.4 7/11/2003 <br /> Ammonia as N(NH3-N) EPA 350.1 0.1 mg/L ND 7/14/2003 <br /> Total Kjehdahl Nitrogen(TKN) EPA 351.1 0.2 mg/L 0.4 7/14/2003 <br /> Total Nitro en Calc. 0.1 1.8 7/14/2003 <br /> DLR=Detection Limit for the Purposes of Reporting <br /> The presence of nitrates and DBCP are not uncommon in shallow ground-water aquifers <br /> in San Joaquin County and other parts of the Central Valley. Nitrate in ground water occurs as <br /> a result of the application of fertilizers, livestock waste, and untreated septic tank waste. Nitrate <br /> is mobile and often accumulates in the shallow ground-water zones. <br /> In the early 1900's, natural levels of nitrate in ground water were measured in forty-three <br /> (43) wells throughout the Sacramento Valley by Bryan.Z It was thought that ground water at that <br /> time was close to "natural"conditions. Based on the work by Bryan, it is estimated that under <br /> "natural"conditions, ground water concentration containing nitrate is no more than about 13.5 <br /> 2 Bryan,K., 1923,Geology and ground-water resources of Sacramento Valley of California:U.S. <br /> Geological Storey Water-Supply Paper 495,285p. <br /> �pERgOy <br /> 7,rSOL♦ <br />