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January 27, 2005 NOA Project Number:'E04070B Page 5 • TKN detections varied from 0.324 to 3.38 mg/l,with an average detection of 1.83 Fimg/l (Plate 3). No drinking water standard has been identified for TKN. • TDS detections varied from 216 to 394 mg/1,with an average detection of 316 mg/1 (Plate 4). Both the maximum and the average value are well below the drinking F1 water MCL of 500 mg/l. • Residual chlorine detections ranged from below the detection limit of 0.02 to 0.069 mg/1,with an average detection of 0.036 mg/1 during the'six months it was detected (Plate 5). Both the maximum and the average concentration are well below the National Primary Drinking Water Standards Maximum Residual Disinfectant Level hGoal (MRDLG)°for chlorine of 4.0 mg/1 . The TTHM concentration, a sum of the concentrations of four THM constituents, F- 1 was due entirely to chloroform during this period. Chloroform detections varied from less than the reporting limit of 2 fag/l to 35.6 pug/1,with an average detection of 17.0 pug/1 during the six months it was detected (Plate 5). Both the maximum and h the average concentration are well below the National Primary Drinking Water Standards MCL for TTHMs of 80 pug/l. The WDRs, however,list 1.1 µg/l as the human toxicity value for chloroform. R" Effluent data is presented at the end of this document as Table 2. Storage Pond Monitorin Fi Storage pond monitoring has been conducted on a.weekly basis between-April 19 and December 31, Fi2004. The storage pond samples were collected from the.south end of the wastewater storage pond, opposite the inlet. Weekly storage pond samples were analyzed for dissolved oxygen (DO) and pH. In addition to the laboratory analysis,weekly freeboard measurements and odor observations were Fill collected by staff of Morada Produce. Flow data was not collected for 2004 but will start at the beginning of the packing season in February of 2005. The results of the storage pond monitoring F1for 2004 are as follows: • DO detections varied from 3.7 to 14 mg/1,with an average detection of 8.0 mg/i (Plate 6). These values are well above the minimum of 1.0 mg/1 specified by the F1 WDRs (Discharge Specification B6). 1. 1 Fi 6USEPA,National Primary Drinking Water Standards,July 2002. Fil