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1 <br /> Mohr-Fry Ranches <br />' 950 Industrial Drive,Stockton, California May 31, 1995 <br /> Phase III Remedial Excavation Report Page: 4 <br /> the undercut wall, supporting the building wall along the entire undercut length <br /> (Figure 7) <br />' Inside the budding, the concrete floor was saw cut and an area 10 feet wide by 25 <br /> feet long was removed (Figure 6) The top five feet was excavated and screened <br /> with the PID to see how far contaminants had migrated laterally The area next to <br /> the grout wall was excavated to 14 feet deep between the pier blocks <br /> Approximately 80 cubic yards were removed <br /> Wall and floor samples were taken at the direction of Mr Steve Sasson, San <br /> Joaquin County Public Health Services, Environmental Health Department <br /> [PHS/EHD] (Figure 6) After soil samples were taken, the excavation was <br /> backfilled with pea gravel to within five feet of grade The remainder was filled <br /> with compacted soil, and the concrete floor replaced The replaced floor was <br /> punned with rebar, poured under the edge of the building wall and supported by the <br /> grout wall below <br /> Floor sample F-3-1 at 23 feet below ground level detected residual Diesel of 12 <br /> mg/kg Samples F-3-2 and WSI-3-10 were taken specifically to quantify the soils <br /> under the building foundation piers that must remain in place F-3-2 had Benzene <br /> (1 2 ug/kg), Toluene (7 3 ug/kg), E-Benzene (9 0 ug/kg), Xylenes (48 ug/kg), and <br /> "ND" for Diesel and Motor Oil Sample WSI-3-10 had only Diesel at 2 8 mg/kg <br /> (Table 3) <br /> Soil removed from outside the building was stockpiled as 5-3-1 and 5-3-2 Soil <br /> removed from inside the building was stockpiled as 5-3-3 Each pile was sampled <br /> separately and composited (Figure 3, Table 3) <br /> 3.4 Soil Sampling <br /> Soil samples were taken in 1" by 6" brass sleeves from relatively undisturbed soil <br /> Soil samples were collected from the floor and walls of the excavation with a hand <br /> operated spoon sampler The laboratory samples did not have head space and <br /> were immediately sealed in their Idiers using aluminum foil-lined caps All sod <br /> samples were properly labeled with project namelnumber, date and time collected, <br /> sample identification and analysis requested Samples were additionally sealed in air- <br /> tight plastic bags before being immediately refrigerated for delivery to the laboratory, <br /> and were under no circumstances opened by anyone other than laboratory personnel <br /> Chain of Custody records were maintained at all times(Appendix A) <br /> Soil samples collected for analysis were analyzed using EPA method 8020 for <br /> BTX&E compounds and 3550 for total petroleum hydrocarbons - diesel The <br /> minimum detection limits used for each analyte was 5 0 ug/kg for BTX&E, and <br />