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I I EXECUTIVE SUMMARY Walgreen Company retained Bureau Veritas North America, Inc. (Bureau Veritas)to conduct a Limited Subsurface Investigation (LSI) at Walgreen Store#02680 located at 15 West Harding Way in Stockton, California (referred to as the"subject property"). This LSI scope of work was developed based on a review of the Phase I Environmental Site Assessment(ESA)that was conducted at the subject property by Bureau Veritas(Project Number 99008-008321, dated September 5, 2008). This LSI was performed in accordance with Bureau Veritas Proposal number 0711.08.0806, dated October 23, 2008. The purpose of the LSI scope of work was to evaluate the recognized environmental conditions(RECs)that were identified in the Phase I ESA: • Historic On-Site Filling/Service Station (3'/z W. Harding Way/ 1501 North Center Street) • Southwestern and Upgradient Adjoining Dry Cleaners (48 West Harding Way) • Southeast Adjoining Filling Station (16 West Harding Way) • Historic Nearby Properties The following conclusions were based on the observations and data obtained on November 11, 20 and 24, 2008 during Bureau Veritas' LSI of the subject property: • The geophysical survey performed by NORCAL did not identify suspect features and/or buried metallic anomalies that are indicative of filling/service station equipment or USTs in the areas investigated. • No physical evidence of soil contamination was noted in the soil borings during this LSI with the exception of deep(approx. 30 feet bgs)elevated PID readings in BV-2, with petroleum hydrocarbon odors in BV-3 and BV-4 that appear to be representative of subsurface groundwater conditions and capillary fringe soils. Concentrations of VOCs and TPH were not detected in the analyzed soil samples. No further action or investigation of soil at the subject property appears warranted at this time. • Detected concentrations of TPH-g in grab-groundwater samples do not appear to be significant. Gasoline range TPH compounds were only reported in grab-groundwater samples collected along the south subject property boundary. Elevated concentrations of TPH-d and TPH-mo range compounds appear to indicate one or more sources, especially since the most significant TPH-d concentrations in groundwater had patterns for Stoddard solvent and kerosene. Stoddard solvent and kerosene were commonly used as cleaning or degreasing compounds at automotive repair and other industrial facilities in the past. Stoddard solvent was also commonly used as a dry cleaning solvent in the past. TPH-mo concentrations in grab-groundwater samples were detected at somewhat higher concentrations than the TPH-d concentrations in the same analyzed sample. TPH in grab-groundwater samples was found to be elevated in the vicinity of the former on-site filling/service station but not in the upgradient sample BV-5. The low concentrations of TPH-g along with TPH-d results with non-standard patterns reported by the laboratory likely indicate aged releases from one or more sources that could have originated from on site and or off site. • Additional site characterization may be requested by SJCEHD to determine the source(s) of the TPH concentrations found in groundwater at the subject property and to confirm the reported concentrations. • The groundwater beneath the subject property is impacted with PCE and other degradation breakdown VOCs that appear to be associated with the upgradient dry cleaner facility located to the southwest. The highest concentrations of PCE in i Project Number 99007-000526.03