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Stockton Unified School District Geological and Environmental Hazards Assessment CSU-Stanislaus,Stockton Campus School Site Page.27 9.0 OPINION It is Condor's opinion that there are three factors relating to the site properties that are considered recognized environmental conditions pursuant to the ASTM Standard. Pesticides have been extensively �. used in the Central Valley and are residual in the soil. A portion of the site has historically been used for a park area and herbicides have been recently applied. There is the possibility of finding residual pesticide or herbicide contamination in the soil on the site property, a recognized environmental condition. The ,,. location of an active former-UST site investigation (this would include the 55-gallon drums) is considered a recognized environmental condition. Due to the age of the storage building, there is the possibility that the hydraulic elevator could contain PCBs; thus a recognized environmental condition. It is Condor's opinion that there are three factors relating to the site that would be considered historical recognized environmental conditions pursuant to the ASTM Standard The electrical switching stations used to contain PCBs, a historical recognized environmental condition. The steam tunnel system could possibly contain hazardous substances; thus a historical recognized F Y envirgnmental condition. The demolition debris assumed to be located under the fill in the current track and field could possibly contain hazardous substances; thus, a historical recognized environmental condition. M•. It is Condor's opinion that there are three factors relating to the site properties that could be considered a de minimis condition. The stockpiles of soil with concrete debris could possibly contain small amounts of +-- discarded hazardous materials, thus Condor considers these areas as having a minimal risk to the site, a de n7inimis condition. The functioning and open-gravity-flow sewer screening station is accessed from a locked door with stairs descending from the site property. The potential for exposure to hazardous waste ... is low, a de minimis condition. The current 50,000-volt electrical distribution station was indicated as having PCB-containing oil in the CIES file review. There was no visual indication of leakage, thus a de minimis condition. It is Condor's opinion that the seven off-site locations revealed by ASTM-specified databases with files located at EHD, are of no apparent risk due to distance and/or the reported eastern and northeastern groundwater gradient directions. Additional information sources were reviewed and identified. There are railroad tracks located approximately 300 feet to the east. Underground natural gas pipeline and steam-tunnel systems are located on the site property.No airport runways were located in the area. We recommend a Geotechnical Engineering Study be completed to further assess site-specific soil '" conditions in accordance to Title 24 prior to design and construction of the proposed site improvements. All opinions expressed herein are based upon the evidence reviewed and the assumptions made during the assessment. Lo 10.0 CONCLUSIONS Condor has performed a Phase I ESA in conformance with the scope and limitations of ASTM Practice E 1527-00, and California Education Code § 17212, § I7213, and § 17215 and California Public Resources Code § 2I 151.8, of APN 139-210-04 located in Stockton, California. Any exceptions to, or deletions from, this practice are noted in Section 11.0 of this report. This assessment has revealed three recognized environmental conditions in connection with the site: r i.., CONDOR