Ord 1986-134 - Laserfiche WebLink

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Delivery of the sample should be made within a time frame that would allow the lab personnel time to conduct conclusive tests on the sample. The time delay between sample acquisition and lab analysis must not have an adverse effect on the sample's .uniqueness. and can be derived by following the . Approved Methods. required for the acquisition, preparation and storage of a particular sample analysis. Samples to be used for surcharge determination and/or the parameters listed in the Code are taken as twenty-four hour composite samples. At least two of these samples per location are required for those industries to be surcharged and these samples are taken on non consecutive days. Even though the actual rate of sampling taken for surcharge determination varies among industries, the two or more samples used for the surcharge should not be taken during the same work week. Any sampling requirements listed as a part of a National Pretreatment Standard shall take precedent over these procedures. II. Resampling Upon Request Whenever a request for resampling an industrial waste discharge into the various sewer or watercourse systems is made by the discharger and authorized by the Director or his/her authorized representative, a specific procedure must be following in the resampling process. The resampling process follows the same guidelines set forth for sampling in part one above. The following details distinguish the resampling process from the sampling process. The discharger is responsible for the cost of resampling except when there has been a major change in an industry's pretreatment system. Annual re-surcharge sampling is not charged to the discharger. Once the resampling is authorized, three samples are taken; one each at the beginning, middle and end of a thrity-day period. Half of each sample is given to the discharger for analysis and half is analyzed by the City. The results of the separate analysis are then compared. If they are not within 10% of each other, a fourth sample is sent to a private lab for additional analysis. The laboratory (City or discharger) farthest from the private laboratory's results will pay the private laboratory's fee. If a surcharge is to be calculated from the results in question, then the results (City or discharger's) closest to the private laboratory's results will be used. -72-