Publication Summary

Class II Inspections were conducted at the city of Raymond Wastewater Treatment Plant (WTP) in September (dry weather) and December 1992 (wet weather). Each inspection included the Port of Willapa Harbor Pretreatment Facility which is a significant contributor to the WTP.

Class II Inspections were conducted at the city of Raymond (Raymond) Wastewater Treatment Plant (WTP) in September (dry weather) and December 1992 (wet weather). Each inspection included the Port of Willapa Harbor Pretreatment Facility (PTF) which is a significant contributor to the WTP.

For the PTF, effluent BOD5 was 360 mg/L during the dry weather inspection, higher than the permitted daily average of 300 mg/L. TSS was 1,640 mg/L, over five times the permitted daily average. Nitrification was not taking place and effluent ammonia concentrations were high. During the wet weather inspection, PTF discharge flow was 66,290 gpd, 23% above the 54,000 gpd permitted daily average. The 24-hour composite BOD5 was 900 mg/L, three times the permitted daily average of 300 mg/L. Oil and grease concentrations were more than ten times the design limits but within permit limits. Chromium was found in the PTF sludge at a high concentration (4,480 mg/Kg-dw). Chloroform and 1,1,1-trichloroethane were volatile organic compounds found in the PTF effluent.

The Raymond WTP performed well during the dry weather inspection. The effluent was well within NPDES permit limits for BOD5, TSS, and pH. BOD5 removal was 94%.

Substantial nitrification was occurring. The WTP removed over 95% TSS during both dry weather and wet weather. During dry weather conditions, the Port PTF contributes up to one fifth of the flow of the Raymond WTP. During wet weather, the PTF was contributing only 5% of the Raymond WTP flow. The PTF effluent BOD5 concentration was 900 mg/L, three times the permit limit. The PTF effluent was responsible for 41 mg/L BOD5 of the Raymond influent BOD5. The WTP did not provide effective removal of organics during the wet weather inspection. Only 30% of BOD5 was removed; 85% removal is required by permit. The wet weather effluent BOD5 concentration of 50 mg/L exceeded the permitted weekly average of 45 mg/L. The effluent BOD5 load of 530 lbs/day was approximately double the 270 lbs/day permitted weekly average. Nitrification did not sphates; sediment samples were analyzed for 98 target analytes, to include chlorinated pesticides, organophosphates, urea pesticides, nitrogen-containing pesticides, and chlorophenoxy herbicides.

Twenty-four pesticides and breakdown products were detected in fish tissue samples, and nine compounds were detected in sediment. One organophosphate pesticide (chlorpyrifos) was detected in fish; the remaining compounds detected were chlorinated pesticides. Of the nine target analytes detected in sediment, one take place during the wet weather inspection. Chromium was found in high concentrations in the WTP influent, but was undetected in the effluent. Due to discrepancies in laboratory results, acceleration of Raymond's lab accreditation process is recommended.