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File No 93342-WP Page 4 <br /> Well Development <br /> 1- All monitoring wells shall be initially developed in order to clean the well and stabilize <br /> sand, gravel, and disturbed aquifer materials from around the screened internal <br /> perforations Well development will be accomplished by air-lift pumping, surge block, <br /> or bailing Well development shall continue until the well is thoroughly developed and <br /> as free of sand, silt, and turbidity as possible <br /> In some cases where low permeability formations are involved (wells that yield less than <br /> three casing volumes), the wells will be purged to dryness twice At no time will a well <br /> be purged to dryness if the rate of recharge is such that formation water will cascade <br /> down the sides of the casing <br /> 2- Developed water will be labeled and contained in SS-gallon drums, pending laboratory <br /> results of the groundwater samples Disposal shall be conform to applicable hazardous <br /> waste requirements <br /> 3- The period of time between development and the first sampling incident shall be at least <br /> 72 hours, in order to allow the well and potential volatile contaminants to sufficiently <br /> stabilize <br /> Groundwater Sampling Protocols <br /> 1- In order to obtain a representative sample of the water in the aquifer being sampled, <br /> stagnant water in the well casing must be removed to permit well recharge with non- <br /> stagnant aquifer water The removal of stagnant water will be accomplished by the <br /> removal of the water to the surface, where it will be stored in labeled, SS-gallon drums <br /> for future disposal, according to applicable hazardous waste requirements <br /> 2- Groundwater samples will be removed from the well by a teflon bailer only after at least <br /> three to five well volumes have been purged from the well casing, or until the discharged <br /> water indicates stabilization of temperature, conductivity, and PH In low yield wells that <br /> have been purged to dryness, samples will be collected as soon as the well has recovered <br /> to a volume sufficient for sampling <br /> ADVANCE SOIL TECHNOLOGY, INC <br />