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GeologualTechnicsInc Page 6 ' Soil and Groundwatei Investigation Work Plan Cardoza(Main St) Piglect No 662 2 January 17,2003 ' 3.4 Extraction Well Installation ' A groundwater extraction well, EW-1, will be placed in the former UST excavation This well will be constructed as outlined in the table below, based on the continuous core log of MW-104 Well o a Screen of and Packrans. rout ca Seal W� "7� - -0' 1-2 sa—and 36-5 - -sur ace Aquifer pumping test details are discussed in Section 6 below ' 3.5 Receptoi Survey GTI completed a well survey for a 2,000-foot radius around the site in July 2000 The purpose of the survey was to locate any municipal, domestic, or agricultural wells within a ' 2,000-ft radius This work was documented in our July 27, 2000 "Well Receptor Survey" report submitted to SJC/EHD and the RWQCB in July 2000 This work will not be repeated, however the entire site will be marked for a USA survey to determine if utility ' conduits could be acting as preferential pathways for contaminant migration 4 0 GROUNDWATER MONITORING The new wells will be incorporated into the current quarterly sampling/monitoring schedule 4 1 Groundwater Sampling Pi ocedure Before sampling is attempted the wells will be sounded for depth to water and then a clear ' disposable bailer will be used to deterintne if floating product is present The wells will be purged of at least 3 well volumes of stagnant water using a submersible pump, a dedicated Watena pump or a stainless steel bailer Purging will continue until the temperature, conductivity, and pH of the groundwater has stabilized (<10% variation between three readings) indicating that formation water representative of aquifer conditions entering the well is being sampled These water quality parameters aie measured at intervals of each well volume purged ' A stainless steel bailer, disposable plastic bailer or dedicated Waterra pump will be used to collect each sample Care will be taken to minimize sample agitation from the initial filling of the bailer to the transfer of the sample to the VOA via] and glass amber liter bottles Once the sample container is filled and capped, the bottle will be inverted, tapped, and checked for headspace bubbles The sample container is identified and labeled with a unique designation, inserted into foam holders and placed in an ice chest cooled to 4°C for ' transport to the laboratory All non.-disposable sampling equipment will be decontaminated using a steam cleaner ' before and between uses The effectiveness of the decontamination procedure is ensured by using the following quality control measures