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Phase 11 Hazardous Materials Study for the Lodi Rail/Multimodal Station July 24, 1997 to Wilbur Smith Associates Project No. E168 ' Summary of Laboratory Findings In general, there were no findings of significance in the samples tested. A level of 1.5 parts per million (ppm)total petroleum hydrocarbons in the diesel range(TPHd)was identified in a soil sample from Boring B1 at a depth of approximately 15.5 feet. Low levels of the heavy metals lead (176 ' parts per billion, ppb) and zinc (950 ppb) were identified in a soil sample from Boring B3 at a depth of approximately 2 feet. These low levels are likely to be background levels of the metals. tSummary of Investigation Findings There were several issues raised in during our Phase I study, geophysical survey, and subsequent discussions that this field exploration program was intended to address. The general issues are addressed below and followed by our findings. ' Issue,A: Qualitative soil gas sampling (PETREX tube) completed by the Regional Water Quality ' Control Board (RWQCB) in 1989 suggested that there was a potential for PCE and ICE (solvents) occurring near the surface within the project site along North Sacramento Street between East Elm and East Pine Streets. If actually present, the source could be on-site or from adjacent site contamination (such as the plume from Busy Bee Cleaners located at 40 N. Main Street). Findings, A: Soil samples from Borings B3, B4, B5, B6, and B11 were tested for halogenated volatiles which included the solvents identified above. No volatile compounds were detected in any ' of the samples. 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. The RWQCB sample results may represent an isolated surficial occurrence that would be very difficult to identify or locate, may be in error, or has since dissipated to levels that were below the detection limit for our soil analyses. It should be noted that the RWQCB sampling ' and analysis methods were different than those completed by Espana Geotechnical Consulting which can account for some variance in findings. 1 Issue, B: Historical research indicates that there were at least 3 service stations located within the site ' at the following locations: 1) at the southeast intersection of East Elm St. and North Sacramento St., 2) at the northeast corner of East Pine St. and North Sacramento St., and 3) at the northeast corner of East Oak St. and South Sacramento St. Each of the 3 stations appears to have had fueling, greasing, and wash areas and may have (or had) underground storage tanks present. 5 ' `� ESPANA GEOTECHNICAL CONSULTING