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Response to Written Comments -20- 24 April 2007 <br /> City of Tracy WWTP <br /> San Joaquin County <br /> section 303(d) as impaired for mercury, based on bioaccumulation of this <br /> pollutant in fish tissue. Methylmercury is the bioaccumulative form of mercury. <br /> CITY OF TRACY - NPDES COMMENT #37: Page E-7, Paragraph IV.A.1., footnote <br /> 4, and Page E-12, Paragraph VIII.A.1., footnote 2. The City contends that the <br /> detection limits for priority pollutants without effluent limitations are not consistent with <br /> the SIP and should be modified. <br /> Request: Modify the last sentence of these footnotes to state "For priority pollutants <br /> without effluent limitations, the detection limits shall be selected from the MLs <br /> published in Appendix 4 of the SIP"in order to be consistent with SIP Section <br /> 2.4.2. <br /> RESPONSE: The requirement for selecting the appropriate detection level in the <br /> proposed Order is in accordance with the SIP and has not been changed. <br /> CITY OF TRACY - NPDES COMMENT #38: Page E-12, Paragraph VIII.A.1. Remove <br /> the reference to noting the presence or absence of bottom deposits as the River is over <br /> 20 feet deep and bottom deposits are not readily visible. <br /> Request: Remove reference to "c. bottom deposits" on Page E-12, or add As <br /> applicable" to 'Attention shall also be given to the presence or absence of.". <br /> RESPONSE: There is no need to make the requested change. If the bottom is <br /> not visible at the time of monitoring, then the Discharger can report this on the <br /> discharger self-monitoring report. <br /> CITY OF TRACY - NPDES COMMENT #39: Page E-14, Sampling Table. The table <br /> at the bottom of page E-14 and top of page E-15 states that "Monitoring Period Begins <br /> on... September 1, 2006." Since this time has passed, a new date should be included <br /> in this table. <br /> Request: Replace "September 1, 2006" with an updated date. <br /> RESPONSE: The proposed Order has been corrected. <br /> CITY OF TRACY - NPDES COMMENT #40: Page F-8, last paragraph. Inconsistent <br /> Statements. The Fact Sheet states that an annual mass loading for TDS shall be <br /> "83,317 lbs/yr," yet the Permit at page 14 states 13,688 tons/year." This paragraph <br /> also needs to delete references to an agricultural supply study as that has been deleted <br /> from the Permit. <br /> Regional Water Quality Control Board, Central Valley Region <br /> Board Meeting— 3/4 May 2007 <br /> Item#17 <br />