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Quarterly Monitoring Program and Remedial System Report(Q2/2000) 3 <br /> Ranch Market,23569 Santa Fe Road,Riverbank,California May 1,2000 <br /> Details concerning the surface well completions and well ownership of the domestic wells are <br /> presented in the field notes included in Attachment 3 On April 6, 2000, SECOR's field <br /> technician interviewed the property owners or renters associated with the four domestic water <br /> wells and found that water pumped from wells DW-1, DW-3, and DW-4 was used for irrigation <br /> and domestic use All parties interviewed indicated they were drinking bottle water <br /> Groundwater Monitoring <br /> Water Table Elevations and Gradient <br /> On April 6, 2000, SECOR personnel measured the depth to water 1n each of the 4 site-related <br /> groundwater monitoring wells and domestic well DW-2 (Table 2 and Attachment 3) A water <br /> level indicator was used to gauge the wells to the nearest 0 01 foot A groundwater elevation <br /> contour map, prepared from the data collected on April 6, 2000, indicates that groundwater flow <br /> is generally toward the south at a gradient of 0 002 ft/ft(Figure 3) Current and historical <br /> groundwater monitoring data are summarized in Table 2 <br /> Separate-Phase Petroleum Thickness <br /> Well gauging and sampling efforts on April 6, 2000, did not detect separate-phase petroleum <br /> hydrocarbons 1n any of the wells monitored (Table 2) <br /> Groundwater Sam lin <br /> Well Purging <br /> On April 6, 2000, groundwater monitoring wells were purged using a submersible pump and <br /> disposable bailers until pH, temperature, and conductivity readings had stabilized Temperature, <br /> conductivity and pH readings were recorded in the 4 wells, at regular purge intervals of one <br /> casing volume, with a portable instrument that was calibrated before the wells were purged <br /> Water purged from the four groundwater monitoring wells was stored in drums on site, pending <br /> characterization and disposal <br /> Two domestic wells, DW-1 and DW-3, were purged by extracting 140 gallons of water prior to <br /> collecting water samples from the water taps closest to the pressure tank Since the water was <br /> actively pumping out of well DW-4, the well was not purged prior to collection of a water <br /> sample (Attachment 3) Since the pump in well DW-2 was not running, a slim-hole bailer was <br /> used to collect a no-purge water sample from the well <br /> File Riverbank 00 2Q rpt doc <br />