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Phase 11 Environmental Site Assessment A Phase 11 Environmental Site Assessment (Phase 11) typically involves further clarification of the recognized environmental conditions.historically recognized environmental conditions or releases ofcontaminants discovered in a Phase 1. Most often, a Phase 11 involves soil,water and/or air sampling to better determine the extent of the impact of the recognized environmental condition. Preliminary Environmental Assessment A Preliminary Environmental Assessment(PEA) is defined by the California Health and Safety Code as an investigation performed"...to determine whether current or past waste management practices have resulted in the release or threatened release of hazardous substances which pose a threat to public health or the environment." The PEA is regulated by the California EPA, Department of Toxic Substances Control. Aperio Inc. performs soil,water and/or air sampling. which is typically involved in a PEA,and also completes mathematical calculations to estimate the potential threat to humans or the environment. Underground Storage Tank Removal Aperio Inc.'s primary role in Underground Storage Tank(UST)removal has been to analvze the soil and/or eroundwater from the location of a UST. If contamination is found,then remediation plans are implemented and./or monitoring wells may be installed. UST removals typically are regulated by local government agencies(city or county)and/or one of the California Regional Water Quality Control Boards. Septic Design Aperio Inc designs septic systems for single family residential homes. Both advanced treatment units and standard gravity systems are within our repertoire. Excavation Services Using a mini-excavator,Aperio Inc.has excavated home sites,septic systems and foundations, graded driveways,and perfonned other earth moving projects related to residential home construction.