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O <br /> CIT -r OF TRACY _ <br /> n'roApoRArra G,dr 2119: 83,2211R. O. BOX 1029 • TR 4C1 • f4Ll4 lIR Nln 9;lth <br /> May 11, 1979 <br /> Regional Water Quality <br /> Control Board <br /> Central valley Region <br /> 3251 "S" Street <br /> Sacramento, CA 95816 <br /> Sirs : <br /> I am enclosing our self monitoring reports for the month of April, <br /> 1979. As can be seen from the reports, we were deficient in meet- <br /> ing our discharge requirements as follows: <br /> 1• We exceeded the minimum effluent pH limit one time. <br /> 2. One bioassay value was invalid because of diseased <br /> test fish. <br /> 3 • We exceeded the daily maximum total coliform limit on <br /> one day . <br /> 4. One BOD value was invalid due to a laboratory error. <br /> 5. One high suspended solids value was invalid because of <br /> the cleaning of weirs which led to a false indication <br /> of effluent quality. <br /> We collected a total of sixty-nine effluent grab samples for chlorine <br /> residual . Out of these, we exceeded our daily maximum limit in <br /> twelve cases. Many of these excesses were due to our attempt to <br /> control chlorine dosage based on effluent flow instead of manually, <br /> based on the current chlorine demand. We found that we could not <br /> control as well on a flow-paced system. <br /> As can also be seen, we achieved an overall BOD reduction of 95 . 4% <br /> and an overall suspended solids reduction of 95. 6 . <br /> If you desire anything further, please let us know. <br /> Sincerely, <br /> WASTEWATER TREATMENT PLANT <br /> DARRELL D . SCOTT <br /> Lab Technician II <br /> cc: City Manager Locke <br /> San Joaquin Local Health District <br /> Enclosure <br />