1. Permitted users, when required by the WRA Director, shall provide and operate monitoring facilities to allow inspection, sampling, and flow measurement of the building sewer, or internal drainage systems at their own expense. The WRA Director may require the placement of such monitoring facilities at the end of each process where pollutants are used, produced, or treated. The monitoring facility should normally be situated on the user's premises and located so that it will not be obstructed by landscaping or parked vehicles.
2. When required by permit and within 90 days of written notification, users shall install a sampling chamber for each separate discharge of the building sewer in accordance with plans and specifications approved by the WRA Director. Users shall provide ample room in or near such sampling chamber to allow accurate sampling and preparation of samples for analysis. Users shall maintain all sampling and measuring equipment in a safe and proper operating condition at all times and at the expense of the user, which equipment shall be safely, easily and independently accessible to authorized representatives of the WRA. Users shall certify all flow measuring devices to be in proper working condition at a frequency specified in the permit or in writing by the Administrator or WRA Director using a qualified technician acceptable to the Administrator or WRA Director.
A. Each sampling chamber shall contain a flume unless another device is approved by the WRA, with a recording and totalizing device for measurement of the liquid quantity.
B. At the discretion of the WRA Director, metered water supply to a user may be used as the volume quantity where it is substantiated that the metered water supply and waste quantities are approximately the same, or where a measurable adjustment agreed to by the Director is made in the metered water supply to determine the liquid waste quantity. Separate meters may be used to subtract water which is not discharged to the POTW or is discharged to a sewer other than the sampled location.
C. Samples shall be taken at a frequency and volume determined by the WRA Director, and shall be properly refrigerated and preserved in accordance with EPA-approved methods. The sample shall be composited in proportion to the flow for a representative 24-hour sample. A time proportioned 24-hour sample may be used if flow proportioned sampling is determined by the WRA Director to be impractical. Grab samples shall be used where appropriate.
3. Users must inform the WRA Director prior to breaking a sampler seal, used to detect sample tampering, unless necessary to prevent loss of life, personal injury, or severe property damage. Users must not place additional seals or locks upon a sampler which may be used by the WRA without first obtaining approval from the WRA Director.