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Wright Environmental Services, Inc. <br /> Monitoring Well Development <br /> 1, Wells will be developed until the water is free of fine grained sediments <br /> and/or until field measurements of pH, and electrical conductivity have stabilized. <br /> Approximately 3 to 10 well volumes of water will be removed during development of <br /> the well. The actual number of volumes withdrawn for development is well <br /> dependent and based on the field judgment. Duration of development will be specific <br /> for each well and site aquifer conditions and continue until the water clears and sand <br /> content is minimal or ceases. <br /> Measurements of aquifer parameters may be taken to observe for aquifer conditions. <br /> Notes of well development will be kept including quantity of water removed, <br /> turbidity, and sand yield and well recharge. <br /> 2. Only precleaned equipment will be inserted into the fter itell s ring Development <br /> and will be decontaminated by washing or steam cleaning <br /> water will be collected and stored in in drums. <br /> Monitoring Well Sampling <br /> 1. Depth to groundwater will be measured to the nearest 0.01 foot, and the well <br /> , the apparent thickness <br /> checked forprod presence <br /> it be f mea <br /> arate <br /> of the ured.phase The well will not be nsampled if ntse e phase <br /> product is present. <br /> 2. The standing well volume calculated, and usually between 3 to 10 well volumes <br /> will be purged from the well prior to sampling depending on well performance and <br /> yield (USEPA (1985) sampling guidance indicates that the number of purge volumes <br /> are related to aquifer strata and specific for each well). <br /> Measurements of aquifer parameters (conductivity, temperature and the pH) of the <br /> water will be taken until parameters have stabilized to indicate that aquifer aner is <br /> res <br /> entering the well ever at least two purse vuuimes. the s�nple. ��... -. - .. <br /> for each well sampled. That field log will record sampling mea ur em turn and <br /> observations. Aquifer parameters which will be measured are; pH, <br /> electrical conductivity. Aquifer water is assumed to be entering the well when these <br /> 'd within a previous measurements. The <br /> parameters e measure <br /> range <br /> he <br /> be <br /> sample will b collected when the well recovers tot within 80% of he original depth <br /> to water measurement. <br /> 3. The groundwater samples may be collected using a Teflon® or disposable bailer <br /> or sampling pump discharge. Sampling gear will be thoroughly steam-cleaned or <br /> cleaned with soapy (TSP) water, rinsed with with deionized or distilled water prior to <br /> the collection of each sample. When bailers are used, a separate clean bailer will be <br /> used to sample each individual well. <br /> WE5 Sampling Protocols <br /> last rev. 5/96 Page <br />