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Problem Assessment Report Page 2 Ranch Market,23569 South Santa Fe Road,Riverbank,CA November 8,2000 removal of the USTs, soil contamination was observed at the bottom of the tank excavation and documented in five soil samples collected after removal of the tanks (Figure 3, Table 1) 2.3 Domestic Wells and Septic Fields ' The Site and the following three residences use septic fields for treatment of waste water and have domestic wells that are the sole source of water for each residence Owner Address Parcel Number Well # Ranch Market 23569 S Santa Fe Road APN 249-070-12 DW-1 Juan Pantoja 23565 S Santa Fe Road APN 249-070-11 DW-2 ' Jose Cano 23659 S Santa Fe Road APN 249-070-10, DW-3 Troy Roe 23665 S Santa Fe Road APN 249-070-09, DW-4 The location of the domestic wells and septic field on each property is shown on Figure 2 Due to the presence of MtBE reported in water samples collected from domestic well DW-2 on October 7, 1999, the RWQCB required the well be shut down In January 2000, the well ' was shut down and a water line was run from the Ranch Market well DW-1 to the Pantoja Property I2.4 Chronology and Previous Site Assessments Due to presence of gasoline in the tank pit soil samples collected following the removal of the ' three USTs on May 20, 1991, additional assessment of the Site was required Refemng to the soil boring and well completion summary presented in Table 2, assessment of the site has been on-going 0 On January 23, 1998, boring B-1 was drilled and sampled to assess conditions in soil ' and groundwater beneath the UST pit Since the soil and grab groundwater samples collected from B-1 contained gasoline range petroleum hydrocarbons, additional assessment was required (Table 1 and 3) ' • On October 7, 1999, domestic well DW-2 was sampled and found to contain 38 parts per billion MtBE (Table 3) Due to the presence of MtBE, domestic well DW-2 was sampled in November and December to confirm the presence of MtBE in the well Domestic well DW-1, located on the Ranch Market Site, is now sampled monthly and DW-3 and DW-4 are sampled quarterly ' 0 On November 24, 1998 four monitoring wells (MW-1 through MW-4) were installed on and adjacent to the location of the former UST pit (Table 2) Since the soil and ' groundwater samples collected from the three wells contained gasoline range petroleum Hydrocarbons (including MtBE), additional assessment was required 9 On April 21, 2000, the RWQCB approved SECOR's April 20, 2000 Work Plan For ' Domestic Well Video Logging ' File PAR-report doc SECOR International Incorporated