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f Phase H Site Assessment Workplan/Health and Safety Plan October 1996 for the Lodi RaiUMultimodal Station Project No. E168-1 ' Results (RWQCB, 1989). At this test location., ion counts (ICs) of 38,000 for PCE and 50,000 ICs for TCE were recorded. Background levels of PCE and TCE appear to be ion counts of approximately 1,000 to 2,000 ICs (and possibly as high as 9000 ICs). This type of soil gas sampling does not result in quantifiable numbers but is a tool that gives an indication of potentially contaminated areas. If this sample is representative of contamination, the existence of PCE and TCE on the site leads us to believe the source could be either on- site or from an off-site location such as adjacent waste lines or the known contamination from Busy Bee Laundry and Cleaners. ' Purpose of This Study This proposed subsurface investigation is based on the findings and conclusions presented in our Phase I - Hazardous Materials Study dated August 10, 1995, subsequent discussions with City and County personnel involved in the project. The proposed trenching, drilling, and sampling program is to identify hazardous wastes that may be present on the subject site. In the process of the investigation, should we encounter hazardous constituents in quantities above San Joaquin County acceptable limits, it would be ' necessary to define both the lateral and vertical extent of that contamination. This subsurface investigation is intended to address the following items: 1) Soil gas sampling completed by the RWQCB in 1989 indicates that there is a potential for PCE and TCE occurring near the surface within the project site between Elm and Pine Streets (see Figure 2). The source could be on-site or from adjacent site 1 contamination (such as the plume from Busy Bee Cleaners located at 40 N. Main Street). 2) Historical research indicates that there were at least 3 service stations located within the Site (see Figure 3, Site Status, 1950). Each of the 3 stations appears to have had fueling, greasing, and wash areas. We expect that underground storage tanks (UST's) ' were (or are) present at all 3 sites. Based on the age of the service stations, it is not uncommon to find that UST's have leaked petroleum hydrocarbons into the soil. Record of tank installation and/or removal could not be found. ' 3) At least 5 dry cleaning facilities were located along or near Sacramento St. between E. Walnut St. and E. Elm St. Many dry cleaners have been responsible for soil and ground water contamination as a result of improper 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. PCE and TCE contamination has ' been identified in several of the City of Lodi water wells. Preliminary studies have been completed by the RWQCB and the Department of Toxic Substances Control to locate these solvent source areas. None of the dry cleaning facilities once located along Sacramento Street (adjacent to the subject site) has yet been identified as a source area. Busy Bee Laundry and Cleaning at the corner of East Elm and North Main Streets has been identified as a solvent source. Although, based on available ' data, it appears unlikely that soil contamination has occurred on the subject site due ' 2 kV ESPANA GEOTECHNICAL CONSULTING