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fPhase 77 Hazardous Materials Study for the Lodi RaiUMultimodal Station July 24, 1997 to Wilbur Smith Associates Project No. E168 It is our understanding that the 500-gallon waste oil tank was removed under observation by San Joaquin County, Environmental Health Division on June 13, 1997 (faxed communication t from Harry Montgomery, SJRRC, June 13, 1997). Soil samples were obtained from the tank excavation by the railroad's environmental consultant, Terranext, and tested for contaminants. Based on preliminary information made available to us, there does not appear to be any ' significant contamination of soil at the tank site. It is expected that Terranext will produce a final report on the excavation and sampling results for the railroad and San Joaquin County. Station 3 Exploration and sampling at Station 3 (northeast corner of the intersection East Oak St. and South Sacramento St.) revealed no underground tanks. Possible product lines were traced to a location where they went below the sidewalk along Sacramento St; this location is marked as location "E" on Figure 2a. An oil/water separator was found in a concrete slab shown as location "F" on Figure 2a. Some soil visually identified as contaminated with grease and oil was observed within the separator basin. Numerous pieces of scrap metal, water pipeline, and air and electrical conduit were encountered in Trenches Tl 1 and T12. We were informed that on or about February 6, 1997 the City of Lodi followed the product lines too an abandoned tank located adjacent to the sidewalk on the northeast comer of East ' Oak St. and South Sacramento St. The tank had been apparently abandoned and backfilled with sand in the early 1980's during road and sidewalk improvements. The abandoned tank was observed by a representative of San Joaquin County, Environmental Health Division. Other than in the oil/water separator basin, significant soil contaminants were not identified visually, during field screening with a PID, or in samples submitted for analyses. The ' contaminated soil observed within the separator basin was left in the basin. Issue, C: ' Several dry cleaning facilities were located along or near the west side of Sacramento St. between E. Walnut St. and E. Elm St. Dry cleaning facilities have been responsible for soil and ground water contamination as a result of disposal of cleaning solvents. Solvent soil contamination can migrate laterally and affect the near surface soil at the subject site either in the liquid or vapor phases. Although not it was not considered likely that contamination, if present, from these facilities would impact the site, confirmatory sampling was recommended. 1 Findings, C: Soil samples from Borings B3, B4, B5, B6, and BI1 were tested for halogenated volatiles which includes dry cleaning solvents. Volatile compounds were not detected in any of the samples tested. The minimum detection limit for the test method was 10 ppb. This suggests that significant contamination by these compounds has not occurred in the areas tested. ' 7 V ESPA&A GEOTECHNICAL CONSULTING