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Y P February 23,2006 NOA Project Number: E06008A 4.0 EVALUATION OF IDENTIFIED CONTAMINATION SOURCES r The leaking fluids from inoperable vehicles previously identified on the subject property may have contaminated on-site soils. Staff of the CVRWQCB suspect groundwater contamination may exist at Roy's Auto Wrecking. NOA is aware of several aquifers in the vicinity of the subject property with different flow directions. No Lstatement of certainty can be made about the potential for subsurface contamination without sampling and analysis. I ` Because the three leaking underground storage tank cases within one-quarter mile of the subject property are all closed, it can be assumed the CVRWQCB is satisfied these do not pose a continuing Lthreat to surrounding properties. Due to the locations and dates of the hazardous materials incidents within one-quarter mile of the // property,as well as the nature of contamination in each case, any impact to the subject property from 61 J these incidents is anticipated to be minimal. 5.0 CONCLUSIONS AND RECOMMENDATIONS As the site is developed,any stained soil or sources of contamination identified,such as those described in Sections 3.2 and 3.3, should be characterized and properly disposed in accordance with federal, ` state, and local regulations. L If the property owners or the EHD are concerned about the potential for contaminants on the property L as a result of nearby sources identified in Section 3.4, soil and/or groundwater samples may be collected and analyzed. LAny additional infrastructure or buried debris that may be encountered during site grading or development should be removed and disposed of in accordance with all applicable regulations. L 6.0 LIMITATIONS i This report was compiled as a Surface and Subsurface Contamination Report for the subject property. This report contains information and data provided to NOA by several sources. NOA in no way warrants the accuracy or completeness of the information provided to this investigation by those Lsources. It should be noted that when an environmental assessment is completed without sample collection and quantitative analysis of soil and groundwater beneath the site,as in this study,no statement of scientific ` certainty can be made regarding latent subsurface conditions which may be the result of on-site or off- site sources. The findings and conclusions of this report are not scientific certainties, but rather, probabilities based on professional judgement concerning the significance of the data gathered during r 8