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•Simpson Paper Inspection Report -2- 30 July 1990 <br /> SAMPLE RESULTS (analyzed by Eureka Lab): <br /> Fixed <br /> BOD Sulfate EC TDS <br /> Clarifier effluent 172 mg/l 254 mg/l 1530 umhos/cm 936 mg/l <br /> duplicate 960 mg/l <br /> RO 1630 umhos/cm 1072 mg/l <br /> duplicate 1600 umhos/cm <br /> Order No. 83-001 does not specify effluent limitations for these constituents. However, <br /> TDS has impacted the ground water with electrical conductivity levels up to 2082 micromhos. <br /> The TDS levels are much lower than the sample results from last year's inspection: RO <br /> Effluent - 1846 mg/1 , and Pond 2 - 1375 mg/l . The EC of the clarifier effluent last year <br /> was 2370 umhos/cm. The lower TDS levels may be the result of an alum reduction from 65-70 <br /> lb/ton to 15 lb/ton. This is one of the steps Simpson has taken to lower TDS levels. <br /> CONCLUSIONS: <br /> Simpson Paper appeared to be well-maintained. No violations of Waste Discharge <br /> Requirements Order No. 83-001 were noted. The dyes in the sludge pond have been analyzed <br /> in the past and do not pose a problem. Simpson is continuing to reduce TDS levels in its <br /> effluent and has an ongoing monitoring program to assess the impact of TDS on the ground <br /> water. Simpson applied for an NPDES renewal on 31 July 1987. However, since discharge <br /> has been exclusively to land since July 1975 and discharge to surface waters will not be <br /> needed in the future, waste discharge requirements are being revised for land discharge <br /> only. <br /> TWILA L. LECLERC, Area Engineer <br /> TLL <br />