ARCHIVED REPORTS PHASE II ENVIRONMENTAL SITE ASSESSMENT REPORT

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]r Phase D Environmental Site Assessment Report-Executive Summary 1025 East Main Street,Stockton,San Joaquin County,Califomia Page 2 An assumed easterly groundwater gradient direction was utilized when assessing the potential risk posed to the Site from off-site locations. This assumed groundwater gradient is based upon groundwater monitoring reports for nearby properties. Groundwater gradients in this area have fluctuated significantly over time, and current gradient directions may not represent historic gradients. Anticipated depth of groundwater was approximately 40 feet below ground surface(bgs). 6. The Phase I ESA identified three Recognized Environmental Conditions (RECs): L1. The historic rail use of the Site -Soil in the immediate area of former railroads and spur lines may be impacted by metals and petroleum hydrocarbons. L2. The construction of the train depot structure prior to the 1970s - Painted wood structures pre- dating the 1970s were likely to be painted with lead-based paint. Asbestos-containing building materials may be present in the WPRR depot. Organochlorine pesticides (OCPs) may have been applied around the depot for termite control. OCPs are a class of pesticides that were banned for use in the United States in the 1970s and 1980s due to toxicity and threat to human health and the environment. ` 3. Multiple off-site properties with identified or suspected groundwater contamination-Groundwater beneath the Site may be impacted by petroleum hydrocarbons and/or chlorinated solvents. L3.0 SAMPLING PROCEDURES AND RATIONALE L 3.1 SITE PREPARATION Condor completed boring permit applications and obtained the required permits prior to initiating field work. The proposed boring locations were marked with white paint and underground services alert L (USA) was notified one week in advance to identify utilities in and near the work area. Condor coordinated all work with the SJCEHD, the property owner, and subcontractors. Prior to commencement of fieldwork, a tailgate safety meeting was held and the site-specific Health and Safety Plan was j discussed with and presented to all field personnel. L 3.2 SOIL SAMPLING L Surface soil samples were collected by removing surface debris; loosening the soil with a stainless steel shovel, and transferring the soil into 9-ounce (oz.) laboratory-supplied glass jars. Subsurface samples were transferred either into a 9 oz. laboratory-supplied glass jar or collected in brass tubes using a slide-hammer. The samples collected in brass tubes were capped and sealed with Teflon tape and end caps. L Each sample container was labeled for sample identification and placed in a cooler chilled with ice. The sampling equipment was decontaminated by washing with a solution of laboratory-grade, non-phosphate s detergent and double-rinsed with distilled water prior to use at each sample location. L L V n i �� CONDO