Laserfiche WebLink
particular parameter. Table 5 has footnotes to indicate the source of each water quality <br />standard. <br />Table 6 provides a comparison of ground water quality to agricultural standards. This <br />Paradox database generated table does not include the units of concentration (mg/1 or <br />ug/1) for each parameter. The units used for each parame tax are the same as those listed <br />on the 9tandard9 table (Table 5) and are also the same as those used in the water quality <br />reports. The frequency column on Table 6 indicates the number of exeeedence9 out of the <br />total number of samples (i .e., 1/2 indicates one exceedence out of two samples). Below is <br />a summary of standards that were exceeded. Given in parenthesis is the souzce and use of <br />each standar4. <br />Parameter Number of We119 <br />pH (COON, irrigation) 1 <br />fluoride lDDDH, irrr qa ti on) 3 <br />iron (COON, irrigation) 3 <br />lead (COON, livestock) 1 <br />manganese (COON, irrigation) 13 • <br />dissolved solids (USEPA, irrigation) 15 <br />dissolved solids (Wyoming, livestock) 2 <br />sulfate (California, irrigation) 16 <br />In addition, a total of five samples had cadmium values that were less than an elevated <br />detection limit (20 ug/1 vs ..a normal detection limit of 2 ug/1) which was higher than the <br />CDOH standard of 10 ug/1. Likewise, a total of five samples had lead values that were <br />less than an elevated detection limit (200 ug/1 vs. a normal detection limit of 20 ug/1) <br />which was higher than the CDOH standard of 100 ug/1. The cause of these elevated <br />detection limits was a decision by the laboratory to dilute the samples prior to analyses <br />in order to reduce the effects of interferences (primarily, high salinity). A review of <br />October 1999 lab data revels no such detection limit problems for cadmium or lead, <br />indicating that the laboratory, as requested by SCC, no longer dilutes the sample to a <br />point where the detection limit exceeds the water quality use standard. <br />In the CDHG's review of the 1998 ANP, a request was made to explain the potential sources <br />of elevated levels for certain me tale, fluorides, and sulfates. Elevated levels of iron, <br />8 <br />