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Phase I1 Environmental Site Assessment Mulls-Modal Station Stockton,San Joaquin County,California Page S • ➢ Two "perimeter" detection borings (PS4-S and PS4-W) were installed along the east side of N Stanislaus Street south of E Weber Avenue ■ Boring PS4-S was advanced to a total depth of 45 feet bgs, soil samples were collected, and a temporary well casing was placed in the borehole on May 20, 2002 Before groundwater elevation data and groundwater samples could be collected, a thunderstorm overwhelmed the storm drains and flooded the borehole The temporary casing was removed and the boring was grouted to surface with neat cement grout on the same day On May 22, boring PS4-W was installed north of PS4-S in order to collect representative groundwater elevation data and a groundwater sample ➢ Seven detection borings (DG1 through DG7) were installed along the west side of N Grant Street ➢ One "perimeter" detection boring (PGI) was Installed along the east side of N Grant Street immediately north of E Weber Avenue ➢ Three detection borings (DA1 through DA3) were installed along the west side of N Aurora Street One "perimeter" detection boring (PAI) was installed along the west side of N Aurora Street immediately north of E Weber Avenue ■ Boring PAI was advanced to a total depth of 114 feet bgs to allow for sampling of a deeper groundwater bearing zone beneath the site Continuous soil cores were collected from the surface to 80 feet bgs at this boring The boring log for PAI is included in Appendix D ➢ Three detection borings (DMI through DM3) were installed along the south side of E Miner Avenue between N Stanislaus Street and N Aurora Street . ➢ One Geoprobe boring (DC5) and five detection borings (DCI through DC4 and DC6) were installed along the south side of E Channel Street ➢ One "perimeter" detection boring (PW1) was installed along the north side of E Weber Avenue between N Stanislaus Street and N Grant Street ➢ One Geoprobe boring (GRI) and five detection borings (DR1 through DR5) were installed on the railroad right-of-way properties adjoining the site to the east ■ Continuous soil cores from the surface to 45 feet bgs were collected from detection boring DR5 The boring log for DR5 is included in Appendix D Borings PS4, PGI, and PAI were moved from their proposed locations due to access restrictions caused by Pacific Gas and Electric construction activities in the N Stanislaus Street and E Weber Avenue right- of-ways No PID indications of contamination were noted during the investigation activities at the right-of-way boring locations However, a visual discoloration was noted within the first five feet of the hand-augered portion of boring CPT-2 5.2.2 Block 1 Between May 31 and June 6, 2002, twelve Geoprobe borings and three detection borings were installed on four parcels of Block 1 Geoprobe and detection boring locations for Block 1 are shown in Figure 6, Appendix A • ➢ Seven Geoprobe borings (GBK1-722-1 through GBK1-722-7) and one detection boring (DBK1- 722-1) were installed in the parking area of 722 E Miner Avenue, a used car lot 1 �n{� CONDOR