AMC Environmental and Water Committees Action Item - Arizona ...

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Photos Demonstrating Collection of Wastewater Sampling in Nogales, SonoraPhoto 1: OOMAPAS-NS pretreatment van at the manholeidentified as Colinas del Yaqui. This location is downstream of ahistorical source of cadmium.Photo 2: This is a SIGMA-900 autosampler that has been modified to fit inthe smaller diameter manholes commonly associated with wastewatercollectors in Nogales, Sonora. The pump and CPU have been removed fromthe original sampler housing and are bolted to a plywood board. The boardis suspended from an iron cross anchored at the top of the manhole.A composite sample bottle is suspended from the plywood backing throughthe use of cables and hooks. To facilitate continuous monitoring, a singlecomposite bottle is lined with ISCO ProPak disposable polyethylene bags,and pre-preserved with 25 ml of undiluted nitric acid. The bottle is suspendedfrom a hook on the plywood backing.Photo 3: This image shows the outfall for the Colinas del Yaquicollector within the manhole. This configuration is typical of mostmanholes in Nogales, Sonora. For this reason, composite samplesare time-weighted rather than flow-weighted.OOMAPAS-NS saves on battery costs through the purchase of standard 12Vmarine batteries that are inserted in original equipment Sigma housing. Thehousing is then duct-taped shut and attached to the plywood backing.20
Photos Demonstrating Collection of Wastewater Sampling in Nogales, SonoraPhoto 5: Over time, fatigueassociated with the intaketubing resulted in samplesbeing missed. In this photo,OOMAPAS-NS is using ducttape to compensate fortubing fatigue. An ISCO GLScompact autosampler wouldresolve this issue.Photo 4: This show the modified autosampler installation in themanhole. The autosampler is covered in a garbage bag to preventdamage from humidity. The sample bottle is suspended from theplywood backing.Photo 6: This shows the extraction of the autosamplerafter a 24-hour composite. Samples are typicallycomposited at a rate of 100 ml every 20 minutes. As perthe sample plan, the composited sample will be tested forpH. If necessary, additional acid will be added to thesample to bring its pH down to 2. OOMAPAS-NS will alsocollect a grab sample for field parameter testing.21
Page 1: ARIZONA-MEXICO COMMISSIONENVIRONMEN
Page 5: ACTION ITEM PROGRESS - TACTIC ACADM
Page 9: On January 25, 2011, ADEQ received
Page 13 and 14: Seguridad Ambiental). Additionally,
Page 16: Attachment B:Letters of appreciatio
Page 22 and 23: Photos Demonstrating Collection of
Page 24: ADEQ Engagement of Sonora Stakehold

AMC Environmental and Water Committees Action Item - Arizona ...

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