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Quality of Rainwater <br />Hantzsche and Finnemore listed 1 mg/L-N as the nitrate concentration of rainwater for <br />their original calculation; in the past, Live Oak has also utilized this value for the nitrate <br />loading calculation. <br />To determine a more accurate local value, Live Oak has collected rainwater during <br />several recent storm events in Lodi. Each sample was collected in a clean, dry, <br />stainless steel bowl, then decanted into a plastic container and placed on ice for <br />transport. The samples were analyzed for nitrate by FGL Environmental of Stockton. <br />The results of the rainwater sampling are as follows: <br />Table 3. Rainwater Nitrate Concentration <br />Date Nitrate (mg/L-N) <br />5/17/2019 0.4 <br />5/19/2019 0.2 <br />3/16/20 0.2 <br />5/18/20 0.4 <br />1/27/21, 10:00 0 (Non-detect) <br />1/27/21, 19:30 0 (Non-detect) <br />1/29/21 0.2 <br />2/11/21 0 (Non-detect) <br />2/12/21 0.1 <br />Average 0.17 <br />Live Oak then averaged the concentrations of the nine samples, for a value of 0.17 <br />mg/L-N to represent the nitrate concentration of rain. <br />Because the San Joaquin County Environmental Health Department has requested that <br />local and recent data be utilized wherever possible, the concentration of the Lodi <br />rainwater been selected for use in the nitrate loading calculation. <br />LOGE 20-33 Page 11