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March 13,2000 Job Number: LG00-067 Page 4 Table: Summary of Available Ground Water Information Date,Source Groundwater Depth Notes February 29,2000, Soil boring. Ground water not encountered in Neil O.Anderson&Associates, Inc. 10-ft.boring. March 2 and 6, 2000, Ground water sample. Nitrate: 4.2 mg/L-NO,(0.9 mg/1-N). Neil O. Anderson&Associates, Inc. DBCP: ND. Spring 1998, San Joaquin County Flood About 15 feet in Gradient about 8.3 feet/mile, Control and Water Conservation District depth. flowing southeast. map. Fall 1997, San Joaquin County Flood Control About 22 feet in Gradient about 12.5 feet/mile, and Water Conservation District. r h. flowing south-southeast. Note: ND—Non-Detectable(or not found at detectable limits) The existing water well that serves the Alegre Trucking facility is thought to be about 200 feet in depth and contains a sanitary seal to a depth of 100 feet. No problems are known to exist with the well. From this well, a water sample was collected on March 2, 2000, 1999 for testing at FGL Environmental Laboratory. A second water sample was collected on March 6,2000 because the sample was not properly chilled while the laboratory was transporting the sample to their Santa Paula laboratory. The samples were tested for the presence of dibromochloropropane (DBCP) and Nitrate(NO3)per County requirements. The test results indicated that DBCP was non-detectable (ND) and nitrate as NO3 found at 4.2 mg/I (0.9 mg/1-N). The DBCP was not detected and the Nitrate test is well below the maximum contaminate level set by the United States Environmental Protection Agency of 45 mg/1-NO3 for nitrate(or 10 mg/1 as Nitrate N). The presence of nitrates and DBCP are not uncommon in shallow ground-water aquifers in San Joaquin County and other parts of the Central Valley. Nitrate sources in ground water occur as a result of the application of fertilizers, livestock waste, and untreated septic tank waste. Nitrate is mobile and often accumulates in the shallow ground-water zones. In the early 1900's, natural levels of nitrate in ground water were measured in 43 wells throughout the Sacramento Valley by Bryan.' It was thought that ground water at that time was close to"natural"conditions. 'Bryan,K, 1923,Geology and ground-water resources of Sacramento Valley of California:U.S. Geological Survey Water-Supply Paper 495,285p. +ye■ . Sem.