2023/04/19 Council Agenda Packet

City of Everett - Water Main Replacement Y March 23, 2023 Page 2 B. PLAN THE EXPLORATION PROGRAM AND OBTAIN PERMITS a. Complete a site visit to review current site conditions, evaluate surficial geology, locate borings, plan the traffic control operations, and develop permit applications for completing the explorations. We will subcontract the traffic control operations including preparation of the plans, and obtaining the signs, flaggers and traffic control supervisor. b. Submit permit applications, traffic control plans, and boring exploration plans to the City of Everett for review and approval. C. FIELD EXPLORATION PROGRAM AND LABORATORY TESTING a. Complete site visits to meet with utility representatives and clear boring locations. This will include completion of the one -call utility locate service and coordinating with APS, a subcontracted private utility locator to clear existing utilities near the borings. b. Explore subsurface soil and groundwater conditions at the sites by drilling 9 borings to depths ranging from 15 to 25 feet (about 150 lineal feet of drilling). Based on the proposed replacement segments, we anticipate drilling the following distribution of borings: • Two borings on Segment 1, Beverly Lane to depths of about 15 feet. We anticipate closing one lane and using two flaggers at this location, and the drilling requiring less than 1/2 day. • One boring on Segment 2, within the left turn lane of 75th Street SE. This boring will be drilled to a depth of about 25 feet and require temporary closure of the left turn lane. • Two borings on Segment 3 within the outside lane of Evergreen Way. These borings are anticipated to be 15 feet deep. We will locate the borings outside of existing entrances to driveways. • Four borings along Segment 5 (Madrona Avenue). Based on the narrow street and observed existing residential parking along the curbs, we anticipate this may require temporary road closure at the boring location while drilling (approximately one hour or Tess at each boring). We will use flaggers to direct residents such that they will still be able to access their property. The field explorations will be completed under the direction of a geotechnical engineer or geologist from our firm. The explorations will be located in the field by measuring or pacing from existing site features such as driveways, structures and other site features shown on the drawings. Our representative will maintain a detailed log of each exploration including the pavement section and underlying soils, and obtain samples of the various materials encountered. The samples will be returned to our office for additional examination and analysis, as necessary, for development of our recommendations. We will haul soil cuttings for offsite disposal. We anticipate a perched groundwater condition may be encountered above the glacial deposits. We will note groundwater observations on the boring logs, monitoring wells are not planned at this time. GEOENGINEERSii File No. 0661-137-00