Laserfiche WebLink
COLORADO DEPARTMENT OF HEALTH <br /> Water Quality Control Division <br /> Rationale - Page 8 <br /> PERMIT NUMBER: CO-0000396 <br /> DISCUSSION AND SPECIAL CONDITIONS: (Continued) <br /> TABLE 6 <br /> CALCULATION OF SALT LOAD (Continued) <br /> Discharge Point 005 j I�1-IIv <br /> Date TDS Flow Load <br /> (mg/1 ) (cfs) (tons/day) <br /> 1/78-47/78 2416 .668 4.35 <br /> 4/78-7/78 1803 .20 •97 <br /> 10/78-1/79 2300 .20 1 .24 <br /> 7/79-10/79 2850 .23 1 .77 <br /> 10/79-1/80 2132 . 15 .86 <br /> 4/80-7/80 852 .09 .21 <br /> 7/80-10/80 3330 .09 .81 <br /> 7/81-9/81 3700 . 18 1 .80 <br /> Average Value 1 . 50 <br /> Discharge points 003, 004 and 005 each discharge <br /> approximately 4 days per week over a period of <br /> 6 months, or approximately 103 days per year. The <br /> total average salt load from the combined discharge <br /> multiplied by the total number of days discharging <br /> gives the total expected yearly salt load to the <br /> Colorado River System. <br /> Total Daily salt load = 1 . 50*+1 . 16*+.058* <br /> (003,004 and 005) <br /> = 2. 718 tons per day <br /> 2.718 tons/day x 103 days/year=279.9 tons/year <br /> 'Values obtained from table 6 <br /> Further, if the worst case (103 days/year discharge <br /> is assumed for 001 , a further increase of 26.5 tong <br /> year is given to the salt load. The total salt <br /> load from the facility is calculated to be: <br /> 279.9 tons/year + 26.5 tons/year = 306 tons/year. <br /> This value is less than the 350 tons/year maximum <br /> provided for under the Colorado River Salinity <br /> Regulations. Thus, the permittee will not be <br /> required to do a study to consider the economic <br /> feasibility of salt removal . However, in spite <br /> of this waiver, quarterly monitoring for salinity <br /> will still be required. It should be noted that <br /> the salt contributions from all of the sedimentatic <br /> ponds except 001 were considered to be negligible <br /> since none of the points 006 thru 018 has had a <br /> discharge under the previous permit. Discharge <br /> Point 001 has had a discharge and the 103 day/year <br /> discharge frequency was used as a worst possible <br />