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n iL Quarterly Monitoring and Sampling Report(Q4 2000) 3 Ranch Market 23569 Santa Fe Road Riverbank California December 19 2000 related to the feasibility test are presented in SECOR's Problem Assessment Report, dated November 8, 2000 Domestic Wells Four domestic water supply wells are located within 340 feet of the former tank pit (Figure 2) Well # Location from Tank Pit Comments DW-1 90 feet west of tank pit onsite well DW-2 120 feet south of tank pit Down gradient of tank pit (well )Idle) DW-3 245 feet south-southeast Down gradient of tank pit DW-4 340 feet south of tank pit Down gradient of tank pit Water samples collected from domestic wells have been analyzed for the presence of BTEX, TPHg, MtBE, TBA, D1PE, ETRE, TAME, 1,2-Dichloroethane (1,2-DCA), and 1,2- Dibromoethane (EDB) Since water samples collected from DW-2 contained reportable concentrations of MtBE, the well was taken out of service On April 6, 2000, SECOR's field technician interviewed the property owners or renters associated with the four domestic water wells and found that water pumped from wells DW-1, DW-3, and DW-4 was used for irrigation and domestic use All parties interviewed indicated they were drinking bottle water Groundwater Monitorinit Water Table Elevations and Gradient On November 16, 2000, SECOR personnel measured the depth to water in each of the ten site- related groundwater monitoring wells (Table 2) A water level indicator was used to gauge the wells to the nearest 0 01 foot A groundwater elevation contour map, prepared from the data collected on November 16, 2000, indicates that groundwater flow is generally toward the south at a gradient of 0 0025 ft/ft (Figure 3) Current and histoncal groundwater monitoring data are summarized in Table 2 Separate-Phase Petroleum Thickness Well gauging and sampling efforts on November 16, 2000, did not detect separate-phase petroleum hydrocarbons in any of the wells monitored (Table 2) File Riverbank-00 4Q