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CEASE AND DESIST ORDER NO.5-2003-0124
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<br /> CITY OF ESCALON
<br /> WASTEWATER TREATMENT FACILITY
<br /> SAN JOAQUIN COUNTY
<br /> 9. Based on the groundwater monitoring performed at the site, groundwater exists approximately
<br /> 37 feet below ground surface. Groundwater flows to the west-southwest.
<br /> 10. The WWTP is on the north side of the Stanislaus River. Surrounding land uses are primarily
<br /> agricultural. A golf country club and residential developments are south of the Stanislaus River.
<br /> VIOLATIONS OF WASTE DISCHARGE REQUIREMENTS
<br /> 11. WDRs Discharge Specification No. B.6 states, "Objectionable odors originating at this facility
<br /> shall not be perceivable beyond the limits of the wastewater treatment facility."
<br /> 12. Prior to adoption of revised WDRs in June 2000, objectionable odor complaints related to the
<br /> facility were documented in October 1996, November 1997, and September 1999. All the
<br /> complaints were related to the industrial wastewater system. The City subsequently improved the
<br /> wastewater treatment system by adding more mechanical aerators to the industrial wastewater
<br /> treatment ponds.
<br /> 13. Since adoption of the revised WDRs in June 2000, objectionable odor complaints related to the
<br /> facility were documented in July and August 2000, August 2001, June and July 2002, and July and
<br /> August 2003. All odors were related to the treatment of industrial waste.
<br /> 14. Staff of the San Joaquin Valley Air Quality Management District (SJAQMD) received 56 odor
<br /> complaints regarding the City of Escalon wastewater treatment plant over a 9-day period in July
<br /> 2003. The SJAQMD issued five violations for odor generation.
<br /> 15. In late July and early August 2003, Regional Board staff received numerous telephone calls and
<br /> five written complaints regarding the odor generated by the City wastewater plant. The
<br /> complainants state that odor conditions have continued for years generally from mid-July through
<br /> September.
<br /> 16. Notices of Violation were issued to the City for objectionable odors in August 2000 and July
<br /> 2003. The NOVs informed the City of its responsibility to control the odors as required by its
<br /> WDRs.
<br /> 17. As shown on the table below, industrial wastewater loading rates increased from a total of 2.4
<br /> million pounds of BOD in 2001 to 3.1 million pounds of BOD in 2002. Data for 2003 is not yet
<br /> available.
<br /> Month/Year Influent BOD Flow Rate BOD Loading BOD Loading
<br /> (mg/L) (Gal/Month) Pounds/Month Pounds/Day
<br /> July-01 1,020 57,708,800 490,917 15,836
<br /> Aug-01 1,030 80,781,200 693,927 22,385
<br /> Sept-01 1,080 79,495,080 716,028 23,868
<br /> Oct-01 960 61,385,930 491,480 15,854
<br /> Nov-01 535 16,382,830 73,099 2,437
<br /> Total for 2001 2,465,451
<br /> July-02 144 52,927,791 63,564 2,050
<br /> Aug-02 1,320 88,301,960 972,099 31,358
<br /> Sept-02 1,035 90,611,820 782,152 26,072
<br /> Oct-02 1,905 77,274,670 1,227,717 39,604
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