Laserfiche WebLink
In the case of the 6n-dedicated pump, it is towered i6to the well and then activates <br /> (power from "the controller box is regulated which controls the discharge rate of the k. } <br /> centrifugal purge.pump). In the case of a well with a dedicated'pump, the pneutma#c <br /> controller box is connected to the dedicated pump (some wells have special hi <br /> gni-rate <br /> Purge pumps used only for purging, these can be id=df"ed by the f ttl4gs on the cap). A <br /> dedicated. discharge tube (kept locked at the well head in a protective . <br /> bag) is then <br /> attached to the discharge fitting on the casing cap. The <br /> Controller is thea turrned on and <br /> adjusted to reach the dlesired purge rata <br /> Note: In all cases where gasoline powered generator or i:ompressors are used,they are to <br /> be placed at least ten feet downwind of the well being sampled. <br /> ' t <br /> j- During ptrr&g, field parameters (pK electrical condo � f <br /> . ctivity, turbidity: and terve) <br /> wv_H be monitored. Parameter measuretnents W111 be recorded on Purge and Sample Logs. <br /> In addition field observations also will be made and re ,vded d)T2 the Purge and Sample <br /> Logs. Such observations include1low rares;-volume-purged, color;odor,bubbling orgy <br /> Wier�no�table observations. Aa example of a Purge Characterizafiorr and Sample Log is <br /> attached. <br /> 6. ung will:continue until staliie parameter readings are vbtaiYred. pH is considered <br /> stable if the readings do.not vary by greater than 0.1 pH uniL Temperature is considezzd <br /> stable if it does not vary by mote that one degree Celsius. Conductivity and turbidity are <br /> considered stable if they do not vary by greater than -1Q'1. Field paratucters.will be <br /> repeated at approximate five gallon intervals. A minimum of three weft volumes of water <br /> will be removed from each well. The final,stable,values will be recorded to be used in <br /> the annuai,r+epott, - • <br /> Samplo Collection <br /> Samples will.be collected as soon as possible after purging is cdmpleteci. Laboratory-supplied <br /> contadners Will be used to hold the,water samples_ Samples to be analyzed for volatile organic " <br /> coustitziants will be collected fust. Dq=ding on.the well, samples will be collected with either <br /> dedicated pumps or disposable bafiers (a new factory wrapped bailer will be used at each well). <br /> Inthe. case of dedicated pumps, the pump rate will be adjusted so that the sample will not be <br /> agitated as it is collected in sample bottles. When bailers are used, they wxM be lowered slowly <br /> into the well so not to disturb the water. The sample will be dtecanted into the bottles slowly with <br /> 349-FFO R231 OR325 A-8 July 14,20ao <br /> 2000 Kkh%Mda•,toe, <br />