2019-137-E AMS - ECS Southeast Northern Campus geotechnical engineering

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DocuSign Envelope ID: B01E86EC-6FC1-43CE-8E90-79CF68C52249 ECS Southeast, LLP covered parcel with wooded areas along the west and south perimeters. Topographic information provided on the Subsurface Investigation Exhibit drawings prepared by Civil Consultants, Inc. indicates that current site grades range from approximately elevation 608 to 650 feet. Based on previous information provided by Civil Consultants, Inc., we understand there was an old pond located within the southwest portion of the site that showed up on older mapping records. Based on visual observations of the site during our preliminary explorations, it appears that this pond has been backfilled. Based on our review of historical aerial images of the site, it appears that the pond may have been backfilled sometime in 2010. From our site observations, it also appears that additional fill materials may have be imported and stockpiled within the old pond area where the grades appeared to have been raised. Historical images indicate that the fill may have been placed sometime in 2015. Test pits were performed by ECS within the apparent fill area in March of 2018, which confirmed the presence of fill soils. The fill was noted to contain high plasticity soils, organic material, small boulders and various other debris indicating that the fill had been placed in an uncontrolled manner. The planned construction at the site will include a new Environment and Agriculture Center (EAC) Building, Parks Operations Building and Detention Center Building. Our understanding of the proposed structures at this time is based on the following information provided by the project design team. EAC Building We understand the EAC Building will have a footprint area of approximately 18,000 square feet and will be located within the northeast portion of the site. We understand it will be a single story steel framed structure planned to be supported on shallow foundations consisting of conventional spread and continuous footings. The exterior walls of the building will consist of light gauge metal studs and a combination of masonry veneer and formed metal cladding. Alternatively, the exterior walls may consist of load-bearing masonry. Maximum anticipated foundation loads provided by Lynch Mykins are column loads up to 60 kips and wall loads up to 4 kips per foot. Parks Operations Building We understand the Parks Operation Building will have a footprint area of approximately 10,000 square feet and will be located within the southeast portion of the site. We understand it will be a pre- engineered metal building planned to be supported on shallow foundations. Maximum anticipated foundation loads provided by Lynch Mykins are column loads up to 60 kips and wall loads up to 4 kips per foot. Detention Center Building We understand the Detention Center Building will have a footprint area of 65,525 square feet and will be located at the approximate center of the site. Information pertaining to building height and planned construction type has not been provided at this time. We assume the structure is planned to be supported on shallow foundations consisting of conventional spread and continuous footings. Design foundation loads have not been provided to us, but we assume they will be may be moderate (column loads up to 250 kips and wall loads up to 8 kips per foot). Paved drives and parking areas will be included in the development, and a stormwater pond will be constructed at the south end of the property. In addition to the new building and site construction, utility improvements are planned for the offsite water line running along the south side of US 70 West ECS Proposal No:06:21174 Page 1 2 ffi-