COMPLIANCE INFO - Laserfiche WebLink

Home Browse Search

• Pack the samples in coolers keeping all samples from one well together. Use bubble-pack or vermiculite to provide cushioning and sample support. • Pack with sufficient ice or blue ice to maintain cool temperatures until arrival at the lab. • Insert the chain-of-custody form in a freezer bag and tape to the inside lid of the cooler. • Seal the cooler with reinforced packaging tape and custody seals. Possession of samples must be documented from the time they are collected until the time they arrive at the laboratory. This is accomplished with a chain-of-custody record. This record lists all sample bottles in a cooler; records sample designations and locations, date and time of collection, and analyses to be performed; and notes the time, date, and signatures of all persons transferring sample custody enroute to the laboratory. If the samples are to be shipped, the chain-of-custody form will be sealed inside a zip-lock freezer bag and taped to the inside lid of the cooler. Quality Assurance The general quality assurance objective for analytical data is to provide environmental monitoring data of known and acceptable quality. Field quality assurance measures include the maintenance of chain-of-custody forms, sample labels, and a field log book that correspond to each other and provide a complete record. It also includes proper equipment maintenance, calibration, and operation. These measures are described above. In addition, one duplicate sample will be collected from HP-3, which is downgradient from the holding ponds and closest to Sugar Cut Slough. This sample will be analyzed for the same parameters as the other samples and will serve as a check on laboratory reproducibility. The laboratory will analyze all samples in accordance with the methods listed in Table 1. Holding Ponds Water Budget Study Background The objective of the water budget study is to evaluate the volume of water, if any, that may be infiltrating through the base of the unlined holding ponds and migrating to the groundwater. Because there is no direct way to measure water losses through the base of the ponds, one way to evaluate the process is to measure the other inflows and outflows from the ponds and calculate infiltration as a remainder. This method involves calculating a water budget for the ponds during a specific time period. The water budget may be expressed by the following relationship: Inflow = Outflow + Change in Storage SAC/SAC36357/041.WP5 11 8/94