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2.2. Risk StudyWhen the activities are considered by the LGEEPA to be highly risky, the environmentalimpact statement must include a risk study.That study consists of including in the environmental impact statement: (a) thepreventive scenarios and measures resulting from the analysis of the environmentalrisks related to the planned activity; (b) the description of the zones of protection inrelation to the installations, if applicable, and (c) the indication of the environmentalsafety measures.In this case as well, SEMARNAT publishes guidelines in the Official Federal Gazette andin the Ecological Gazette (Gaceta Ecológica) to facilitate the preparation and presentationof the risk studies.2.3. Preventive ReportFor certain works and activities specified in the Environmental Impact Regulation, suchas works related to hydraulics, general means of communication, oil pipelines, gaspipelines, carboducts, poliducts, or the petroleum and petrochemical industries, a preventivereport should first be presented to SEMARNAT in any of the following cases:a) When there are official Mexican standards that regulate the environmental impactsresulting from works and activities such as those planned;b) When the works or activities are expressly set forth in a partial urban developmentplan or an environmental zoning ordinance, which already has an environmentalimpact authorization;c) In the case of installations located in industrial parks previously authorized bySEMARNAT.287Environmental LawIn this regard, SEMARNAT also publishes in the Official Federal Gazette and in the EcologyGazette the guidelines for the presentation of the preventive report.SEMARNAT will review and issue a ruling on the preventive report within a term nogreater than 20 business days from its presentation. The purpose of the ruling will be:(a) to authorize the work or activity in question without the need to present any type ofenvironmental statement, or (b) request the presentation of an environmental impactstatement.It should be mentioned that constructive approval is applicable in the case of worksor activities that are totally regulated by official Mexican standards. Thus, if the authoritydoes not issue a ruling within the 20 business day term, it will be understood thatsuch works or activities can be carried out as planned, in accordance with the applicableofficial Mexican standards.