ARCHIVED REPORTS_2009_15 - Laserfiche WebLink

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I. The p , conductivity, and nirbidity 'meters will be calibrated ata minimun, at the <. beginning of each samplingday using commemially obtaffied. 'brad® n will be checked two to es dming the day to evaluate the potential that the cammtion is drifting thmughout the dAY, -Jf instrument drift is detocted in the field, the meas eats taken fting purgingand sampling will be adjusted ° y &2mple calibration logs are m M' purging and sampling of the wells the instruments will be usM ut the same'manner as&ring caflbrzfion. 2. Depth to water will be m ed again, 'or to sampft, in each well as described in Section 4.4.1 and recorded on the purge 'on Sample Log. The volume of groundwater in the well casing wfll be calculated usingthe following equation(s): 4-in6 wclL- (Total Well Depth fioln the mark on the well casing (A) - DTW (g)) x 4.653 gal/fL .3., Prior' to purging, the-water•wU be% -by-usngm ditsposable'bailer that is clear- enough to sex throu& Features such as immiscible layers will be noted and m If immiscible layers-arc observed the well will not be purged prior to sampling. 4- The well will then be purged using the e .Due to the fact that the pumps,must l purge water from depths as great as•70 to 80 fftt below ground surfac+ey purge nates range from 1/4 to Y ga[lon per minute— This-p e ,rate does not appear to exceed the recharge rates of the Purgewaterwill be discharged to-1he ground (see Secdon 4.4.6)_ Depth to vw=mea=cments Will be taken periodically dudng purgm& The purp=of these measurements is to monitor-drawdown. If a in groundwater elcvzdon is the purge rate will be s�4d un&equilibrium(purge rate equals mcb2rge tate) _ is achievedL The Ealucacy of measurement will be every five minutes initially demeasing to once every one- hour has been reaclied- If equilibrium cannot be reached,it wiU be accesmy to Purge the well to dryness. Purge. - Until less than I Q'lo of the originel volume of water in the well., Hand Wing Pay be requhvd to med this• o ` ` 've. every 15 minutes to evaluate rocharge. Start sample coli 'on vhcn ddw two fed of waw has filled the well or-1.75 hours has of purging. CoHect volatile orgatucs no later than two hoursaf ker purging, Record all actions and rumi w=ent associated wit purging a well dry on the Purge Char tion and Sample Log. " $4 1t2310R3 23 A-7 July 14,2400 da.tar.