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Sh <br /> Pacific Environmental Resources Corp. <br /> 959 South Caast Drive * Suite 315 * Costa Mesa,Califomia 92626 • tel: 714-352-7750 fax: 714352-1165 • percwater.com <br /> May 21, 2009 <br /> Brendan Kenny <br /> Central Valley Regional Water Quality Control Board <br /> 11020 Sun Center Drive,#200 <br /> Rancho Cordova,CA 95670-6114 <br /> Dear Mr. Kenny <br /> As you are aware,on the evening of Sunday,May 18'h there was an overflow of the <br /> collection system at the Arbor mobile home park. Following is a description of the <br /> events that took place and what steps were taken to resolve the issue. <br /> At 8:26 pm on 5118109 a resident called the park maintenance department and reported <br /> sewage overflowing from a cleanout line at space#72. Arbor mobile home park staff <br /> responded to the wastewater plant and found that the influent pump breaker had tripped <br /> and raw sewage had backed up in the wetwell. No high level alarm was received. By <br /> 8:36 pm the back-up pump was in service and the overflow at unit#72 had ceased. Arbor <br /> staff hosed down the area of the overflow. Water from this hose down and the raw <br /> sewage flowed into the gutter and to the on-site storm water drain located just north of <br /> the overflow. This sewage and wash down water flowed into the storm drain collection <br /> system and to the on-site storm drain retention pond. <br /> The morning of the 19th I notified OES and the San Joaquin County Department of Public <br /> Health of the spill. I also left a voicemail on your office phone. On the 21"we pumped <br /> the contents of the storm water collection system into the wastewater treatment system. <br /> We then flushed the collection system from the drain where the sewage entered the storm <br /> water collection system,to the inlet of the storm water retention pond. This flushing <br /> water was also collected and pumped through the wastewater treatment system. We are <br /> coordinating with our analytical laboratory to grab a total coliform sample from the outlet <br /> of the storm water collection system to verify that the line was adequately flushed. I will <br /> forward the result to you when we receive it. <br />