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~ ~ iiiriiririn ~ - ' ~~-03 ~ ,~ <br />999 rrrr~r . <br />Permit Number: 000037656 <br />Discharge Number: 001 A <br />Facility: Mesa Gravel - Pmahedr Coe-Q.- <br />The Total Dissolved Solids value was calculated using the provision <br />allowed by footnote "g" of Page 3 in the NPDES Permit issued on November <br />6, 1985. Footnote "g" allows the permittee to calculate the TDS based <br />upon the level of electrical conductivity. The following is a list of <br />the dates and the values used to calculate a TDS value. <br />Date TDS mg/1 <br />EC25~ umho EC25~/TDS <br />06/04/86 634 930 1.47 <br />10/26/86 996 1393 1.40 <br />12/02/86 1010 1394 1.38 <br />03/04/87 928 1317 1.42 <br />03/29/88 276 385 1.39 <br />Avg. 1.41 <br />Based upon the average EC25~/TDS values of 1.41 and the EC25~ of 587 <br />umho on 04/07/88, the calculated TDS is 416 mg/1. <br /> <br />