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EMLab P&K 1150 Bayhill Drive, Suite 100, San Bruno, CA 94066 (866) 888-6653 Fax(650) 829-5852 www.emlab.com Client: AMEC Foster Wheeler Environment& Date of Sampling: 03-31-2015 • Infrastructure, Inc. : WA Date of Receipt: 04-03-2015 C/O: Mr. Michael Smith Date of Report: 04-06-2015 Re: 5915178810 Mold/Fungal Growth Rating Details Growth Quantities of molds indicating growth are listed in the MOLD/FUNGAL GROWTH section.Judgement is used Rating in determining the amount of growth present in the sample.For example,if only one portion of the sample has evidence of heavy growth,then it will receive a rating of heavy growth even though,strictly speaking,on a percentage basis of the entire sample,the amount of growth is low. Swab/Tape/Dust/Wipe sample Bulk Sample < 1+ Evidence of very light growth observed on the sample Areas of very light growth detected by the presence of (Very as indicated by spores of one type seen with underlying spores of one type seen with underlying mycelial and/ 1 Light mycelial and/or with their sporulating structures found or with their sporulating structures in the bulk sample. Growth) in less than 10%of the microscopic fields examined. 1+ Evidence of light growth observed on the sample as Areas of light growth detected by the presence of (Light indicated by spores of one type seen with underlying spores of one type seen with underlying mycelial and/ Growth) mycelial and/or with their sporulating structures found or with their sporulating structures in the bulk sample. in 10 to 25%of the microscopic fields examined. 2+ Evidence of moderate growth observed on the sample Areas of moderate growth detected by the presence of (Moderate as indicated by spores of one type seen with underlying spores of one type seen with underlying mycelial and/ Growth) mycelial and/or with their sporulating structures found or with their sporulating structures in the bulk sample. in 26 to 50%of the microscopic fields examined. 3+ Evidencef heavy eagrowth observed on the sample as Areas of heavy p growth detected by the presence of (Heavy indicated by spores of one type seen with underlying spores of one type seen with underlying mycelial and/ Growth) mycelial and/or with their sporulating structures found or with their sporulating structures in the bulk sample. in 51 to 75%of the microscopic fields examined. 4+ Evidence of very heavy growth observed on the sample Areas of very heavy growth detected by the presence of (Very as indicated by spores of one type seen with underlying spores of one type seen with underlying mycelial and/ Heavy mycelial and/or with their sporulating structures found or with their sporulating structures in the bulk sample. Growth) to be nearly confluent in the majority of the microscopic fields examined. Miscellaneous Spores Slides/specimens are examined for the presence of mold spores and pollen,noting the quantities and distribution of spore types found.A designation of'normal trapping'is made when a mix of spore types is present with the same general distribution as is usually found outdoors.In other words,the biological component of the sample surface is like that found everywhere.Types of spores present would include basidiospores(mushroom spores),myxomycetes(slime molds),plant pathogens such as ascospores,rusts and smuts,and a mix of saprophytic genera with no particular spore type predominating.Many of these spore types would not be found growing indoors on building materials since many plant pathogens require living plants for growth, and mushrooms require compost,leaf duff of various types,or associations with roots of certain trees,etc.Due to these factors, when a mix of spores seen include these types as well as pollen,the rational source is the outside air,rather than indoor mold growth.The numbers of miscellaneous spores seen are graded and described as shown below as none,very few,few,variety,and wide variety. None Very Few Few Variety Wide Variety No spores detected Very few spores A few spores detected Many spores Many spores detected containing a variety of containing a wide different genera variety of different detected genera detected EMLab P&K,LLC EMLab ID: 1347001,Page 6 of 6 26