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6.0 CONCLUSIONS Dames&Moore conducted a Phase I Environmental Assessment of the light industrial park located at 15,700 McKinley Avenue in Lathrop, California (subject property) to evaluate the potential for a Recognized Environmental Condition to exist on the subject property from on-site or off-site activities. Dames & Moore's conclusions are presented below. 6.1 ON-SITE RECOGNIZED ENVIRONMENTAL CONDITIONS Based on Dames & Moore's review of available information, Recognized Environmental Conditions were found to be associated with the subject property. The following concerns were identified: • A release from an underground waste water clarifier has impacted subsurface soil at a depth of approximately 5 feet with up to 350 ppm TPH-gasoline, 10,000 ppm TPH-diesel, and 0.094 ppm PCE. The area of soil impacted has not been fully defined, but appears to be limited to approximately 10 feet from the clarifier and less than 10 feet deep (less than 25 cubic yards). The shallow subsurface beneath the adjacent evaporation pit may also be impacted by the wastewater discharge because it appears that the liner is not impermeable. Potential impacts to groundwater from the waste clarifier/evaporation pit area have not been evaluated. • Minor soil staining was evident beneath the AST located along the northern edge of the property. The effect of this release is not considered to be a significant impact to soil or groundwater beneath the site. • Painting on bare soil adjacent to Building C has covered the soil surface with paint. American Modular Systems has provided a Product Data Sheet for the Aquatek 50 Series red oxide waterborne primer that is used for spray painting outside of Building C. Although the paint is water-based, it contains 206 g/L (or 1.72 lb/gal) of volatile organic compounds (VOCs), including glycol ether and sec-butyl alcohol. Glycol ether (also known as 2- ethoxyethanol) and butyl alcohol (also known as 1-butanol) are toxic chemicals subject to the reporting requirements of SARA Title III.The Environmental Protection Agency(EPA) Region IX has established Preliminary Remediation Goals (DRGs), or cleanup levels, for these chemicals in soil. The residential PRGs are 26,000 parts per million(ppm) for glycol ether and 6,500 ppm for butyl alcohol. Groundwater quality standards are not available for these compounds. Due to the volatility of these chemicals, it appears unlikely that soil concentrations would exceed the PRGs except perhaps in the surface paint layer. However, i the historical use of spray paints and thinners of chemical composition that is different than R:VVM981CM.013 22 DAMES&MOORE