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PIOREPORT (June 20, 2003) LOCKEFORD ELEMENTARY SCHOOL EXPANSION BTEX, and another soil sample collected from the other end of the excavation at a depth of about14 feet bgs contained 6.7 ug/kg of xylenes and no other detectable constituents. Based on this data, the County issued a letter, dated November 3, 1999, stating that no further action was required at that time. A site reconnaissance was conducted by URS and DTSC personnel in December 2002. URS personnel noted that the apparent area of the former UST is covered with a portland-cement concrete slab and the surface drainage for the southern parcel is to a drop inlet located near the eastern edge of the parcel. Based on the observed conditions at the Site, the following issues were incorporated into the PEA field investigation: • The area where the former UST was located is covered with a Portland-cement concrete slab. Two soil gas and soil matrix sampling locations (SG-19 and SG-20) were placed in this area- one near either end of the slab. • Surface drainage for the southern parcel is to a drop inlet located near the eastern edge of the parcel. One soil gas and soil matrix sampling location (SG-21) was placed near the drop inlet, as it is located in one of the lowest areas of the parcel. 3.3.5 Prior Assessments/Remediation The Phase I ESA, conducted by NOA, found no recognized environmental conditions at the Site except for the following [NOA, 2002]: • probable areas of moderate soil contamination by petroleum hydrocarbons throughout the Site, especially near the former UST, existing ASTs, and maintenance areas; • a potential for soil contamination by metals, petroleum hydrocarbons, and polycyclic aromatic hydrocarbons (PAHs) along the area of the former rail line; • a potential for elevated levels of metals and hydrocarbons in the soil below the slab of the building; and a potential for asbestos-containing materials, lead-based paint, and bricks with elevated metals content in the existing building. This PEA addresses the first three items listed above, but does not address the final item since if LUSD acquires the Site, LUSD intends to either remove the building or transfer the portion of the Site that includes the building to another party. Removal of the building would require proper handling to assure that hazardous materials do not remain on the Site. .3-4 URS CORPORATION PAPEA LockeforMeporALockeford Report Rev.doc