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G"togtO,rec&ucs/a Page 4 <br /> Feasibility Study&Investigation Work Plan <br /> Cardoza(Main St) <br /> Project No 662 2 <br /> April 19,2004 <br /> Well o. Dia./TD Screen Slot Sand PackTrans. Grout Seal <br /> ' - sand - S Seal <br /> 36'-surface <br /> - sand - -surface <br /> ' 2.5 Monitoring Well Development <br /> After the well sealing materials have set (>24 hours) the new wells will be developed (using <br /> mechanical surging and pumping methods) until a clear stream of water is obtained The <br /> ' wells will be purged and groundwater samples collected after well development All <br /> development and purge water will be containerized in 55 gallon DOT approved containers <br /> and stored on site until their disposition can be arranged <br /> ' 2.6 Groundwater Monitoring <br /> The new monitoring wells will be incorporated into the existing quarterly monitoring <br /> schedule <br /> ' 2.7 Groundwater Sampling Procedure <br /> Before sampling is attempted the wells will be sounded for depth to water and then a clear <br /> ' disposable bailer will be used to determine if floating product is present The wells will be <br /> purged of at least 3 well volumes of stagnant water using a submersible pump, a dedicated <br /> Waterra pump or a stainless steel bailer Purging will continue until the temperature, <br /> conductivity, and pH of the groundwater has stabilized (<10% variation between three <br /> readings) indicating that formation water representative of aquifer conditions entering the <br /> well is being sampled These water quality parameters are measured at intervals of each <br /> well volume purged <br /> ' A stainless steel bailer, disposable plastic bailer or dedicated Waterra pump will be used to <br /> collect each sample Care will be taken to minimize sample agitation from the initial filling <br /> ' of the bailer to the transfer of the sample to the VOA vial and glass amber liter bottles <br /> Once the sample container is filled and capped, the bottle will be inverted, tapped, and <br /> checked for headspace bubbles The sample container is identified and labeled with a <br /> unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for <br /> ' transport to the laboratory <br /> All non-disposable sampling equipment will be decontaminated using a steam cleaner <br /> ' before and between uses Disposable gloves will be used by the technician to collect all <br /> samples and will be changed with each sampling event <br /> A chain of custody document, listing all samples collected, accompanies the samples from <br /> ' field to laboratory, thereby providing a means to track their movemen4 and insure their <br /> integrity <br /> ' All water purged from each monitoring well and not used as a sample, will be placed in a 55 <br /> gallon DOT approved container, properly labeled and stored on site until its proper <br /> disposition can be arranged <br /> ' 2.8 Groundwater Laboratory Analysis <br /> The groundwater samples will be delivered to California certified laboratory for analysis <br /> The samples will be analyzed for <br />