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Appendix D Direct Push Bonn investigation AA S Phase Il ESA Multi-Modal Station Sax-Block Project January 6,2063 Page 4 of 15 . 3.3 DIRECT PUSH BORINGS 3.3.1 Right-of-Way Between May 14 and September 13, 2002, two Geoprobe borings, 23 detection borings, and eight perimeter borings were installed in the right-of-way of the six streets that enclose and transect the six- block field area, as well as the railroad right-of-way properties (Figures 5 - 11, Appendix A) ➢ Three "perimeter" detection borings(PSI, PS2, and PS3)were installed along the west side of N Stanislaus Street between E Miner Avenue and E Weber Avenue Boring logs of PS 1, PS2, and PS3 are included in the back of Appendix D ➢ 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 boring on May 20, 2002 Before groundwater elevation data and groundwater samples could be collected, a thunderstorm overwhelmed the storm drains and flooded the boring 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 (DAl 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 the back of Appendix D ➢ Three detection borings (DM1 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 (DC1 through DC4 and DC6) were installed along the south side of E Channel Street ➢ One "perimeter" detection boring (PW 1) 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 the back of Appendix D Borings PS4, PG1, 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 •