Laserfiche WebLink
MMEN <br /> r� <br /> prior to installing the bentonite seal in order to maximize the filtering capacity of the <br /> wells. <br /> Full development of the wells will be performed a minimum of 48 hours after well <br /> completic-n. This will include additional surging and bailing along the screened interval <br /> 1 to remove fine particles from the sandpack. After several volumes of the water have <br /> been remiaved,the wells will be pumped(or bailed)until the discharge water is relatively <br /> free of sand or silt. <br /> 4,4 Monitoring WeA Sampling Procedures <br /> i <br /> Each groundwater monitoring well will be purged prior to collecting groundwater <br /> samples for chemical analyses. During the purging process,approximately three to five <br /> well volumes of groundwater will be discharged from the well using either a centrifugal <br /> pump or Mailer. The well will be properly purged when the physical parameters of the <br /> groundws1 (i.e.,pH,temperature, and conductivity)have stabilized. If the well is <br /> evacuated prior to the removal of three to five well volumes, a sample of the <br /> groundwsiter will be collected when the water level is sufficient to provide a <br /> representative sample(i.e., return to 80% or more of the static water level). <br /> Samples.)f the groundwater will be collected from each monitoring well using a <br /> Teflon® jr stainless steel bailer which has been washed in a solution of Alconox <br /> followcd'by several rinses with potable or deionized water,or using a disposable bailer <br /> which w•as removed from its factory protective cover immediately prior to sampling the <br /> well. Thi groundwater samples collected from each well will be decanted into the <br /> appropriate sample containers for each analyte. Sample containers will be chemically <br /> 1 preserved by the laboratory prior to going into the field. Care will be taken when <br /> transferring the water from the bailer to the sample containers to avoid turbulence and all <br /> VOA vials will be filled above the top of the opening to form a positive meniscus so that <br /> no headspace will be present. <br /> 4.5 Water LEvel Measurements and Surveying Top of Casing of Monitoring Wells <br /> After the,;water levels in the wells have stabilized, the depth to water in the wells will be <br /> measure<I to an accuracy of 0.01 ft using an electronic immersion probe. The top of <br /> casing ofi each well will also be surveyed to a common datum to convert depth-to-water <br /> level mensurernents to relative groundwater elevations. All surveyed elevations will be <br /> performed to an accuracy of 0.01 ft. All survey locations in the X-Y coordinate will be <br /> taped to an accuracy of 0.1 ft. <br /> 5.0 SO11L AND GROUNDWATER SAMPLE HANDLING PROCEDURES <br /> The following pnc"dures will be used for soil and groundwater sample handling: <br /> 1. Each rewined sample will be labeled using waterproof ink with the project name, <br /> borehole;I.D. number, sample depth(for soil samples),time and date collected, <br /> and the initials of the sampler. <br /> f402_331-98_63 A..$ <br /> J <br />