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s <br />temporary modification. The total recoverable iron value on a sample <br />collected May 5 was 200 ug/1. <br />On April 28, a total recoverable iron value of 1,490 ug/l was observed <br />at Outfall 011. The standard listed on the DMR is 1,000 ug/l. <br />However, the same temporary modification mentioned above also applies <br />to this stream segment, 13e, Grassy Creek. In the same amended permit <br />mentioned above, the total recoverable iron limit is now "Report", <br />which reflects the temporary modification. This excursion was most <br />likely caused by a beaver dam found in the discharge culvert the day <br />of sampling. A sample had to be collected that day, as it was getting <br />towards the end of the month. Precipitation was predicted for the last <br />two days of April, and this site is inaccessible when the road is <br />muddy. The total recoverable iron value on a sample collected May 4 <br />was 570 ug/1. <br />On April 14, a total recoverable iron value of 1,040 ug/l was observed <br />at Outfall 016. The standard listed on the DMR is 1,000 ug/1. <br />However, the same temporary modification mentioned above also applies <br />to this stream segment, 13d, Dry Creek. In the same amended permit <br />mentioned above, the total recoverable iron limit is now "Report", <br />which reflects the temporary modification. This excursion was most <br />likely caused by snowmelt runoff. The total recoverable iron value on <br />a sample collected May 10 was 110 ug/1. <br />Due to a mix-up of lab parameter lists during the permit amendment <br />that occurred this quarter (May 1), total suspended solids and total <br />iron were not analyzed in May at Outfalls 012, 016 and 017. However, <br />total recoverable iron was analyzed for in May, with values of 100, <br />110 and 250 ug/l, respectively. The total iron values would most <br />likely be similar to those values. Total suspended solids and total <br />iron are no longer required to be monitored at these outfalls in the <br />second permit amendment effective July 1, 2010. <br />Please contact me at 970-276-5209 if you have any questions. <br />Sincerely <br />Dennis Jones <br />Hydrologist I <br />2