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Conditions (RECs) identified with the classification of each REC per the ASTM and AAI guidelines: o Recognized Environmental Conditions (RECs): defined under the ASTM standard as "the presence or likely presence of any hazardous substances or petroleum products in, or at a property due any release to the environment, under conditions indicative of a release to the environment, or under conditions that pose a material threat of future release to the environment. The term is not meant to include "de minimis" conditions or conditions not likely to exist. o Controlled Recognized Environmental Conditions (CRECs): defined as "a recognized environmental condition resulting from a past "a recognized environmental condition resulting from a past release of hazardous substances or petroleum products that has been addressed to the satisfaction of the applicable regulatory authority'. Examples of CRECs would be the issuance by the local regulatory agency of a "no further action required" letter, property use restrictions, activity and use limitations, etc. o Historic Recognized Environmental Conditions (HREC): defined as a past release of any hazardous substances orpetroleum products that has occurred in connection with the property and has been addressed to the satisfaction of the applicable regulatory authority or meeting unrestricted use criteria established by a regulatory authority, without subjecting the property to any required controls (for example, property use restrictions, activity and use limitations, institutional controls, engineering controls)". A historical release may be classified as a current REC if it poses a current threat to the subject property, or if regulatory criteria has been updated and therefore includes the historical release as a current problem. o De minimis conditions: defined as"conditions that generally do not present a material risk of harm to public health or the environment and that generally would not be the subject of a government enforcement action if reported to the appropriate governmental agency. De minimis conditions are not RECs". o Material threat: defined as "a physically observable or obvious threat which is reasonably likely to lead to a release that, in the opinion of the environmental professional, is threatening (imminent) and might result in impact to public health or the environment". An example of a material threat (as excerpted from the ASTM standard) might include an aboveground storage tank that contains a hazardous substance 2 3 and which shows evidence of damage. The damage would represent a material threat if it is deemed serious enough that it may cause or contribute to tank integrity failure with a release of contents to the environment, conversely, the mere presence of an above ground storage tank alone (without damage severe enough to cause a release of contents) does not constitute a material threat under the ASTM standard. For added reference, our Phase I ESA Report organizational structure is as follows: • Introduction • Subject Site Identification and General Description • Geologic, Hydrogeologic Conditions • Historic Information • Site Reconnaissance • Regulatory Information • Interviews • Findings, Conclusions, and Recommendations • Limitations Appendices: • Maps and Figures • Site Photographs • EDR Report - Regulatory Database Search • Supporting Documentation • Preparer Credentials Upon review and receipt of comments from the City, KMEA will provide resolution to comments received and proceed to finalize the report upon approval by the City. City of Santa Ana Page 7 June 5, 2018 Various Environmental Services RFP NO.: 18-043