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`VI- S I:IiRN G1- 01. 001C RI 50URC1, 5 , INC 0 STANDARD OPERATING PROCEDURES RE.- GROUNDWATER PURGING AND SAMPLING SOP-4 Prior to water sampling, each well is purged by evacuating a minimum of three w(_11-casing volumes of groundwater or unto the discharge water temperature,conductivity,and pH stabilize The groundwater sample should be taken when the water level in the well recovers to 80%v of its static level The sampling equipment used consists of either a teflon bailer or a stainless steel bladder pump with a teflon bladder If the sampling systc,m is dedicated to the well, then the bailer is made, of teflon, but the bladder pump as PVC with a polypropylene bladder Forty milliliter (ml) glass volatile-organic- analysis (VOA) vials, with teflon septa, are used as sample containers The groundwater sample is decanted into each VOA vial in such a manner that there, is a meniscus at the tap of the vial The cap is quickly placed over the top of the vial and securely tightened The VOA ,I vial is then inverted and tapped to see if air bubbles are present If none are present, the, sample is labeled and refrigerated for delivery under chain-of-custody to the laboratory Label information should include a sample identification number,job identification number,date,time,type of analysis requested, and the sampler's name For quality control purposes, a duplicate water sample Is collected from each we11 This sample, as put on hold at the laboratory A trip blank is prepared at the laboratory and placed in the, transport cooler It remains with the cooler and is analyzed by the laboratory along with the groundwater samples A field blank as prepared an the field when sampling equipment as not dedicated The field blank is prepared after a pump or bailer has been steam-cleaned, prior to use in a second well, and is analyzed along with the other samples The field blank demonstrates the quality of in-Geld cleaning procedures to prevent cross-contamination To minimize the potential for cross-contamination between wells, all the wc,11-development and water- sampling equipment that as not dedicated to a well as steam-cif aned between each WC11 As a second precautionary measure,wells will be sampled an order of least to highest concentrations as established by previous analyses Y: H1FJ