REVISED/CORRECTED DMRS Sometimes it will be necessary for the facility to submit a revised or corrected DMR either because the Agency has requested it or the facility has discovered an error. Some reasons for submitting a revision/correction are: 1. Missing original or unauthorized signature 2. Missing NPDES Permit Number, Discharge Number (Outfall Number) and/or Monitoring…
Sampling and Reporting Discharge Monitoring Reports (DMRs) The sample collection and analytical results required by the effective permit (EPA or state issued) must be reported to the enforcement authority (EPA or state) through the submission of DMRs (EPA Form 3320-1). An original and one legible copy of the DMRs must be submitted to the enforcement…
Total Residual Chlorine Chlorine is a common wastewater disinfectant. Residual chlorine in effluent is toxic to fish in receiving streams and so must be removed with a dechlorinating chemical, such as sulfur di-oxide. Many NPDES permits place limitations on the amount of total residual chlorine (TRC) that can be discharged after dechlorination. Often, a permit…
1. A water storage tank is 35 feet in diameter and 65 feet high. WIth no water entering the tank, the water level dropped 14 feet in 5 hours. Find the average flow for water leaving the tank in gallons per minute. 2. If two pumps transfer 120 gpm each how long will it take…
1. A well operated digester normally receives sludge at about _ % volatile solids and reduces it to about _ % volatile solids. a. 70 – 75%, 25 – 30% b. 90 – 95%, 45 – 50% c. 90 – 95%, 25 – 30% d. 70 – 75%, 40 – 45% 2. Chlorine applied minus…
pH In a laboratory, pH meters are generally calibrated once in the morning and once in the afternoon. In the field, calibrate for each set of samples or whenever field conditions change. Calibrate to two points that bracket the expected sample pH and are at least 3 pH units apart using the following sequence: *…
pH Measurement of pH is one of the most important and frequently used tests in water/ wastewater analysis. Practically every phase of water supply and wastewater treatment is pH dependent. At a given temperature, pH indicates the intensity of the acidic or basic character of a solution. A solution’s pH is the outcome of the…
1. How many gallons does a 400 foot long section of 24-inch pipe hold? 2. The distribution system has 3 storage tanks. Each tank is 50 feet square and 30 feet deep. What is the maximum storage volume of the distribution system in gallons? 3. Find the perimeter of a circular sedimentation basin if the…
1. BOD is a term that refers to the _. a. oxygen demand in milliliters per hour per square meter of lagoon surface during the aerobic phase of metabolism b. oxygen required to neutralize the effects of anaerobic organisms in wastewater effluents c. oxygen required to stabilize the decomposable organic matter in a wastewater sample…
Total Suspended Solids The volume of sample to be filtered depends upon the amount of suspended matter in the sample. In general, only about 50 – 100 mL of raw influent can be filtered; while filtering 1000 mL of clean effluent is common. High solids content samples like mixed liquor from an activated sludge plant…
