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MODIFIED LIST OF ADDITIONAL QUESTIONS The following additional information is required to complete the report of waste discharge: 1. Provide descriptions of the types of trailers that are cleaned, including their contents, or residual contents. 2. Provide a list of any sanitizers, disinfectants, surfactants, or other chemicals used in the cleaning process. Attach material safety data sheets for all chemicals used. 3. Provide all historical analytical data collected while characterizing wastewater at the site. The data previously submitted, while helpful, is apparently incomplete based on references to petroleum hydrocarbons in your 26 October 1999 letter. Also include any data collected using hand held instruments, such as the total dissolved solids (TDS) data discussed with staff during the site inspection. Information on the instrument used and a brief discussion of calibration procedures and frequency is also required. 4. Provide any groundwater quality data available from the on-site domestic well. Also include information on the screened interval(s) of the well. If data is not available, sample the well for the following analytes : o Total Specific Conductance o General Minerals (Total Dissolved Solids, Barium, Calcium, Magnesium, Sodium, Potassium, Chloride, Nitrate, Sulfate, Total Alkalinity [including alkalinity series], and Hardness) 5. The hydraulic capacity of the stormwater pond must be sufficient to accommodate the wastewater inflow, surface water inflow, and rainfall. A minimum two feet of freeboard in the pond will be required. Provide an analysis of the hydraulic capacity of the stormwater pond. 6. Additional characterization of the wastewater quality is required. The samples shall be collected at the end of the wastewater generation cycle, so as to be representative of the proposed wastewater discharge. As discussed with Staff on 2 December 1999, Rapid Wash has monitored wastewater quality with hand held meters to estimate wastewater parameters. It is recommended that any instruments used to provide data as requested in Items No. 3 or 4,be employed at the time of sample collection to verify the instrument accuracy. The wastewater shall be sampled for the following parameters: o General Minerals (Total Dissolved Solids, Barium, Calcium, Magnesium, Sodium, Potassium, Chloride,Nitrate, Sulfate, Total Alkalinity [including alkalinity series], and Hardness) o Total Settleable Solids o BODS (Five day Biochemical Oxygen Demand at 20 degrees Celsius) o pH o Specific Conductance o Any chemicals identified in Item No. 2 above