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m m I I I I I I ! I I I I I I I I ! 14r. Ramon Burton July 12, 1985 Page 4 co-disosal application forms along wit)) our laboratory report should be forwarded to Ms. Lisa lhrovig at the Minnesota Pollution Control Agency. If acceptable, the MPCA will then issue a permit for Waltek, Inc. to dispose of these three wastestreams at the sanitary landfill. Elevated concentrations of iron in both the wheelabrator and grinding dust and chromium in the grinding dust may pose potential problems for approval. However, the volume for both of these wastestreams is small, which will hopefully be taken into consideration in the MPCA's review for approval. Oil Waste - It is our recommendation that your oil waste be disposed of through a registered NPCA transporter such as Bert's Oil. Sometime in the near future new regulations will be promulgated by EPA/MPCA regarding control of waste oil as a hazardous waste. When these regulations are promulgated the management procedures for the waste oil will Probably )lave to be changed. ~aste Water Profile ., Currently Waltek, Inc. discharges its wastewater streams to a drain field located adjacent to the facility. As a preliminary step to assess potential impact of this discharge to the soil and groundwater in the area representative samples of t~e wastewater discharge from Waltek, Inc. ~ere collected by PACE Laboratories, Inc. and analyzed for all suspected contaminants related to Waltek, Inc. manufacturing processes. A composite wastewater sample was collected by PACE Laboratories, Inc. This sample was obtained by collecting grab samples from the Set Up ~astewater stream, shell room rinsewater and rinsewater from the parts tank. Our report of laboratory analyses for the shell rinse set up composite is attached for your review. It is estimated by Waltek, Inc. personnel that the combined industrial wastewater discharge to the drain field 'is approximately 2500 to 30L)O gallons per year. I~dsed upon our analysis it appears that some care Should be exercised in .~)ischargiug t~)e v~aste~ater to the drain field to assure that it is i~roperly neuCralized before discharge. Composite v~astewater analyzed had ,~ pi( of 2.1. Caustic should be added to '~he wastewater to raise tl~e pH iJetween 6.5 and 9.U prior to uiscilarge. Outside of corrositivity the ,) bier parameters analyzed on the was tewater showed i t to be non-hazardous. Additionally, comparing the metal values obtained on the wastewater stream to the Safe Drinking Water Act (SDWA) prima'ry and secondary standards for metals only chromium at O.U9 rog/1 (SDt~A is 0.05 rog/l) and iron at 1.5 rog/1 (SDWA is 0.3 rog/l) exceeded the Safe DrinKing Water Act ,~riteria. Ti~e laboratory data also si~ows trace levels of volatile m