Addendum 1 - Attachment B

Description

ADDENDUM No. 1 For Mr. Rip Robertson City of Tucker Test Pit Exploration Tucker Town Green Railroad Avenue & 2nd Street Tucker, DeKalb County, Georgia Project No.: TUCKE-24-GA-07852-02 625 Holcomb Bridge Road, Norcross, GA 30071 • 770-209-0029 • unitedconsulting.com TUCKE-24-GA-07852-02 Page 2 of 6 March 18, 2024 Mr. Rip Robertson CPRE, CPSI City of Tucker Parks and Recreation Via Email: RRobertson@tuckerga.gov RE: Addendum Report of Test Pit Exploration Tucker Town Green Railroad Avenue & 2nd Stret Tucker, DeKalb County, Georgia Project No.: TUCKE-24-GA-07852-02 Dear Mr. Robertson: This addendum report should be read in conjunction to our Report of Geotechnical Exploration for this project (Project number TUCKE-24-GA-07852-02, dated October 23, 2023). The purpose of the current exploration was to better evaluate the composition of existing fill materials encountered in the previous borings and to estimate the extent of the poor fill. During this round of work, ten (10) test pits (designated as TP-1 through TP-10) were excavated by our subcontracted excavator using a Takeuchi TB2150 excavator. The test pits were located in the field by our engineer using a handheld GPS device. The approximate test pit locations and the previous borings are shown on attached Figure 1 – Boring and Test Pit Location Plan. SUBSURFACE CONDITIONS – TEST PIT EXPLORATION Initially, a thin layer of topsoil with gravel was encountered in the majority of the test pits. Below the topsoil or at the ground surface, fill soils were encountered in the test pits to depths ranging from approximately 2 to 14 feet. The fill soils encountered generally consisted of clayey/silty sand or sandy clay with varying amounts of minor constituents including rock fragments, cobbles, boulders, and various debris such as concrete, asphalt, brick, metal wires, wood, roots, and other organics fragments. Test pits TP-3 and TP8 were terminated on possible gravel utility backfill at depths of approximately 14 and 5.5 feet, respectively, to avoid possible damage to the utilities. Below the fill, alluvial soils were encountered in test pits TP-1, TP-2, and TP-4 through TP-7 to depths ranging from approximately 10 to 14 feet. The alluvium encountered generally consisted of silty/clayey sand or sandy clay with varying amounts of roots, mica, and rock fragments. Alluvial soils are deposited by flowing water and are often in a soft or loose condition.