responsiveness summary to public comments - US Environmental ...

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Protection, Inc., showed that annual means have been below the Maximum Contaminant Level
(MCL) for atrazine for the 1996-1999 period, and that the Safe Drinking Water Act (SDWA)
monthly average of samples for these public water supplies (PWS) have been below the MCL for
atrazine. In addition the VMP data indicated the following:
a. In Labelle No. 2 Lake, the data showed no atrazine annual average above the
maximum contaminant level (MCL) in either raw water or finished water from 1996 through
August 22, 2001.
b. In Monroe City Route J Lake, although some individual samples were above
3.0 ppb, the raw water mean for atrazine was 2.78 ppb during the period 1994 through 1999, and
the mean from January to August 2001 was below the MCL.
c. In Lewistown Reservoir, all samples analyzed from 1996 through 2000 were
non-detections.
d. In Vandalia Lake, while some individual samples were above 3.0 ppb since
1996, all finished water annual means were below the MCL including year-to-date through
August 22, 2001; and,
e. In Edina Reservoir, some individual samples were above 3.0 ppb since 1996,
but all finished water annual means were below the MCL including the year-to-date mean in
2001.
Stinson Creek
EPA Response: EPA approved MDNR’s listing of these 5 lakes and reservoirs.
Comment: This stream is presently listed as having BOD problems (which translates
into low DO) below the Fulton WWTF. In was commented that, according to water quality
monitoring data collected by MDNR and EPA since the early 90s indicates, early morning DO
levels during low flow conditions were measured upstream and downstream of the Fulton
WWTF discharge. On 5 of the 7 occasions, DO was higher, which leads to the conclusion that
the typical downstream DO condition either maintains or improves the normal DO profile of the
stream upstream of the outfall, and is thus in conformance with state water quality standards.
EPA Response: EPA approved Missouri’s listing of Stinson Creek for BOD and VSS.
Cave Springs Branch
Comment: The State of Oklahoma has slated Cave Springs Branch for removal from its
303(d) list based on consistent effluent quality from the Simmons Food plant. This small,
effluent dominated, intermittent stream has 0.2 miles in Missouri and more than 3 miles in