Laserfiche WebLink
L <br /> LMr. Steven Malcoun <br /> December 9,2003 <br /> ` Page 6 <br /> 4.3 Potential Ground Water Contamination Issues <br /> L <br /> A Surface Subsurface Contamination Report(SSCR) was prepared our office for the subject Site. <br /> The report was dated July 28, 2003 and the project number for the report is LE03-274. The only <br /> L recommendation made was that the owners of the electrical transformers should be contacted to <br /> check for any age related weaknesses. <br /> L 4.4 Water Sample Location <br /> A well water sample was collected as part of this study and submitted to the analytical laboratory <br /> L for Nitrate and DBCP testing. The sample was collected from the agricultural well located on the <br /> southeast comer of the property(Plate 1). The water sample was collected from the large <br /> diameter orchard discharge pipe attached to the well head. <br /> 4.5 Sample Collection,Handling, and Transportation <br /> L A water sample was collected at 3:05 and 3:06 P.M. on November 19,2003 by David Welch of <br /> Neil O. Anderson&Assoc. Inc., Lodi California. The sample was remanded to Precision <br /> L Enviro-Tech Laboratory under chan of custody for nitrate and DBCP testing at 3:30 P.M. The <br /> samples were placed in a cool container while transported to the laboratory. <br /> ` 4.6 Water Sample Analytical Results <br /> Nitrate was detected at a concentration of 1.56 mg/L as NO3 in the water sample obtained from <br /> L the domestic well. The maximum contaminate level for nitrate as NO3 is 45 mg/L. DBCP was <br /> not detected in the water sample. The chain of custody and analytical reports prepared by <br /> LPrecision Enviro Tech are located in the appendix of this report. <br /> The presence of nitrates is not uncommon in shallow ground water aquifers in San Joaquin <br /> County and other parts of the Central Valley. Nitrate in groundwater occurs as a result of the <br /> L application of fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and <br /> often accumulates in the shallow ground water zones. <br /> L In the early 1900s, natural levels of nitrate in ground water were measured in forty-three (43) <br /> wells throughout the Sacramento Valley by Bryan(1923). It was thought that ground water at <br /> Lthat time was close to "natural'conditions. Based on the work by Bryan,it is estimated that <br /> under"natural'conditions, ground water concentration containing nitrate is no more then about <br /> 13.5 NO3 (3 mg/L-N). Areas having 24.75 mg/L NO3 (5.5 mg/L-N) or more are those in which <br /> L <br /> y 'OFXSOy <br /> L A <br /> e'r�r <br /> ` I <br />