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GEOTECHNICAL <br /> NEIL O. ANDERSON I -ENVIRONMENTAL <br /> A 'N 'D A S S O C I A T E, S I INSPECTIONS a TESTING <br /> LABORATORY SERVICES <br /> POOL ENGINEERING <br /> POST TENSION DESIGN <br /> August 9, 2007 AUG 1 0 2007 <br /> NOA Project Nu'mber:E06085A <br /> EW1R;:t AAENT HEALTH <br /> /1SErVICES <br /> Anka Behavioral Health <br /> 1875 Willow Pass Road, Suite 300 <br /> Concord, California 94520 m <br /> 6 <br /> Subject: Anka Septic System Monitoring' <br /> 401 South Airport Way, Manteca, California <br /> Dear Anka Behavioral Health, <br /> Enclosed is the invoice for the monitoring of the-subject property AdvanTex'treatment system. The <br /> next monitoring;which will occur near the end of August 2007 will be the final monitoring for the <br /> calendar year. Nancy Kramer, of our office, met with Ted Tasiopoulos, EHD Inspector-on July 30; - <br /> 2007 for the annual review of the system. <br /> We understand that a phone line has recently been connected to the system and is now accessible to <br /> Orenco operators for their monitoring and maintenance (1-209-825-8603).After reviewing the <br /> 'r monitoring data from our office and trouble shooting the system on August 6, 2007,Tristian <br /> Bounds, the Orenco system operator and engineer determined that the treatment system was <br /> performing nitrification well,but not denitrifying,an essential function of the treatment system. <br /> is <br /> It was his opinion that due to what may have been low attendance at the Anka Health Center, the <br /> recirculation settings were too high for for such minimal flows, and that by decreasing the <br /> Y' recirciilatioinrate,rhe system rriaypexfoiri -inane adequately'Tlie'recirculation to retention ratio'was <br /> set for 30 seconds on and 8.5 minutes off to accommodate approximately 1,000 gallons per day.. <br /> The system has been adjusted to 30 seconds on and 14.4 minutes off to accommodate what is a <br /> more likely flowof 600 gallons per day. The reduction of the recirculation will lower the dissolved <br /> oxygen,improving anoxic conditions (impairing'denitrification). <br /> ,I <br /> l <br /> EI <br /> LODI ■'SACRAMENTO ■ MODESTO <br /> ENVIRONMENTAL DIVISION 902 Industrial Way;Lodi,California 95240 11111111209.3673701 ■ 209.369.4228 fax ■www.noanderson.coin <br />