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k" KLEINFELDER 4 ACTIVITIES CONDUCTED Kleinfelder obtained boring/well permits from the San Joaquin County Public Health Services Department, Environmental Health Division (PHS/EHD) and Encroachment Permits from the City of Stockton. Two exploratory soil borings were advanced on either side of the proposed March Lane and UPRR underpass. The borings were advanced to a maximum depth of 60 feet bgs. A temporary monitoring well was installed in each of the borings. During the advancement of the soil borings, Kleinfelder collected soil samples for logging purposes, field screening and potential chemical analysis. The soil borings were advanced using 8-inch outside diameter hollow stem auger. Chemical analysis was subsequently conducted on a total of eight soil samples, two groundwater samples and four blank water samples. 4.1 PRE-FIELD ACTIVITIES A workplan was submitted to the San Joaquin County Public Health Services Department, Environmental Health Division (PHS/EHD) for their review. Approved well/boring permits were obtained prior to initiating the field activities. Additionally, Kleinfelder secured an Encroachment Permit from the City of Stockton on April 24, 1998. For a copy of the permits, please refer to Appendix C. 4.2 FIELD ACTIVITIES On June 1 and 5, 1998 two temporary monitoring wells, TW-1 and TW-2 (corresponding to borings EB-1 and EB-2) were installed on the east and west sides of the UPRR tracks, respectively, at the approximate locations shown on Plate 2. Groundwater was found at depths ranging from 45 to 47 feet bgs. The temporary monitoring wells were installed using a truck- mounted drill rig equipped with 8-inch hollow stem augers. Soil samples were collected at 5 foot intervals beginning at 5 feet. To provide a qualitative indication of the presence of volatile organic constituents in the soil and to monitor the constituent concentrations in the breathing zone, a portable organic vapor analyzer was used to screen the samples in the field. A Photovac MicroTip® photo-ionization detector (PID) was used to measure total ionizable compounds in parts per million by volume (ppmv) of vapor. Soil samples obtained were screened in the field, and the PID readings were recorded on the boring logs. Hydrocarbon-like odors and discoloration were present in soil samples collected at the five foot depth interval in EB-I/TW-1 and EB-2/TW-2. Additionally, this soil was noted with minor wood debris and is suspected to be fill material. The depth interval range of the suspected fill material is estimated to be approximately 3 to 8 feet bgs. Hydrocarbon-like odors 20-3712-08.E01/2018R5 10 Page 6 of 16 © 1998, Kleinfelder, Inc. July 9, 1998