Sampling Rate Sample Clauses

Sampling Rate. A two-inch submersible bladder or low flow variable-speed electric submersible pump (e.g. Timco bladder or Grundfos Rediflo) will be used as the default device for sample collection. If well recovery is so slow that a satisfactory water column height for normal pump operation is not maintained, then a zero submergence bladder pump, Waterra® pump or Teflon ▇▇▇▇▇▇ will be used for sample collection. The use of any other device must have pre-approval by the MPCA hydrogeologist. The Sampling Form will show what type of pump or ▇▇▇▇▇▇ was used to sample each well. The approximate depth of the pump intake setting must also be reported. The same pump will be used for sampling as was used for purging. Pumping will be continuous and sampling will immediately follow purging. The pump must be pulled immediately after sampling and the water level measured immediately after removal of the pump. If pumping is not continuous it will be noted on the Sampling Form. The sample collection pumping rate will be less than or equal to the purging rate. However, in ▇▇▇▇▇ with a high velocity of flow (3-4 gpm), the sample rate can be lowered to aid in the collection of dissolved gases or volatile organic compounds. The sampling time will be recorded on the Sampling Form.