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November 19, 1999 Job Number:599303 Page'4 As part of the record search, a-nearby well permit dated 4-18-85; and drillers"log was found for 101 E. Highway 12,Lodi. This log indicates a maximum clay thickness of up to 29 feet and maximum sand thickness up to 27 feet were found at that location..A total'of nine layers of . _ alternating-sand.and clay were found to"a.depth of 155 feet. Depth to ground water was 'mea sured.at 55 feet (see appendix for log/permit). One ground water sample was collected from-the an agricultural"production located on the ; _ larger 80-acre property about't.330 feet southwest of-the 1.75_acre site. The-water,sample collected from the on.November 10, 1999 and'submitted to the FGL Environmental Laboratory and tested for the presence of dibromochloropropane(DBCP) and_Nitrate(NO3) per County , # requirements. The test results indicated that-DBCP was found to be 0.33.ug/l and'nitrate as NO3 .found to be 145'mo 3.2 mg/17N).. The DBCP test-exceed the maximum contaminate-level set' by the United States Environmental Protection Agency of 02 ug/l (or'2 parts-per billion)_ The presents of nitrates and DBCP are not uncommon in shallow ground-'water aquifers in Sari Joaquin County.and other parts' of tlae Central,Valley. .Nitrate sources in ground water occur from agricultural 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 pinindwater at that time was:close t&."naturd'conditions. Based on the work by Bryan it.is estimated that under"natural" conditions, groundwater concentration of F -nitrate is no more then about 3 mg/1=N. Areas having 5.5 mg/l-N or more are those in which nitrate concentrations maybe increasing..' : DBCP is a nematocide and soil fumigant fouvegetables, and grapes. Tt is thought to cause health problems consisting of kidney damage,_liver-damage;-anis cancer' The use of DBCP was discontinued in-1979:_ Bryan,K., 1923,Geology and ground-water re_so_uroe_s of,Sacramento Valley of California:-U_5. s Geological,Survey water-Supply Paper 495,285p. - a Hull,L-C., 1984,Geochemistry of Ground Water in the Sacramento Valley,California:U.S_ Geological Survey Professional Paper 1401-B. x o �