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LIVE OAK GEO ENVIRONMENTAL, INC. 407 W. Oak St., Lodi, CA 95240 •:• (209)369-0375 •:• logelodi.com February 12, 2019 Project Number: 1903 Jeffrey Wong, REHS San Joaquin County Environmental Health Department 1868 E. Hazelton Ave. Stockton, CA 95205 Regarding: Addendum to Nitrate Loading Study (SR0080159) Water Testing Results Coldani Winery and Olive Mill Expansion 13950 N. Thornton Rd. & 5920 W. Kingdon Rd., Lodi, CA PA-1300159 Dear Mr. Wong: This letter addresses the collection of a water sample from the above project Site and is intended to be reviewed along with the above Nitrate Loading Study submitted on February 4, 2019. Live Oak collected a water sample from the domestic well on the Site on January 30, 2019. The sample was analyzed for nitrate and dibromochloropropane (DBCP) per San Joaquin County Environmental Health Department policy. As required by the laboratory, the samples were collected in a plastic container and two glass vials for nitrate and DBCP analysis, respectively. Trip blanks were also utilized. The samples were placed on ice and transported under chain of custody to FGL Environmental, Stockton. Nitrate was detected in the sample at a concentration of 36.8 mg/L-N. DBCP was not detected. For health reasons, we recommend that the well water not be consumed until nitrate levels can be reduced to below the MCL. Utilizing bottled water for drinking water may be a good alternative to consider. Nitrate is commonly detected in shallow ground water aquifers of the Central Valley. Application of fertilizers, livestock waste, and untreated septic tank waste can all contribute to nitrate in ground water. Nitrate is mobile and tends to accumulate in shallow ground water zones. Based on work in the Sacramento Valley from the early 1900s, it is estimated that under "natural" conditions, ground water contains nitrate at concentrations no more then about 13.5 mg/L-NO3 (3 mg/L-N). Nitrate may be increasing in areas with concentrations of 24.75 mg/L-NO3 (5.5 mg/L-N) or more (Hull, 1984). The US EPA has set the Maximum Contaminant Level (MCL) for nitrate as nitrogen at 10 mg/L. Although nitrate is a naturally-occurring compound necessary for plant growth, it can cause health problems when present at high levels in drinking water. The most common health effect of nitrates in water is methemoglobinemia, or blue baby syndrome, which results in reduced oxygen supply to vital tissues. Pregnant women and certain others can also develop Environmental ❖ Engineering Geology ❖ Geophysics