1018 14TH ST 2023-02-09 - Laserfiche WebLink

SHANNON&WILSON,INC. 2.0 FIELD EXPLORATIONS AND LABORATORY TESTING Our scope of services for this project included performing four borings to provide data for evaluation of the subsurface conditions for the proposed bulkhead replacement. The borings were initially designated as B-1 through B-4; however, locations B-1 and B-3 had to be moved to avoid utilities or portions of the existing deadman system. The revised designations are B-1 B and B-3C. The approximate locations of the borings are shown in the Site and Exploration Plan presented in Figure 2. The locations were measured with a cloth tape from existing site features and should be considered approximate. Groundwater monitoring wells were not included in our scope of services. Borings B-1 B, B-2, B-3C, and B-4, were drilled using mud-rotary drilling techniques by Holocene Drilling, Inc. under subcontract to Shannon & Wilson, Inc. during the period between August 13 and 15, 2012. The borings ranged in depth from 56.3 to 71.5 feet, for a total footage of about 255.8 feet. To avoid damaging the existing anchorage system,the first 10 feet of each boring was vacuum excavated. Standard Penetration Tests (SPTs) were performed in the borings generally at 2.5-to 540ot intervals in accordance with ASTM International (ASTM) standards. This test consists of driving a 2-inch-outside diameter split-spoon sampler a total distance of 18 inches into the bottom of the borings with a 140-pound harnmer falling 30 inches. The number of blows required to cause the last 12 inches of penetration is termed the Standard Penetration Resistance (N-value). When penetration resistances exceeded 50 to 100 blows for 6 inches or less of penetration, the test was terminated. The N-value is an indicator of the relative density or consistency of the soil. The split-spoon sampler used during testing recovers a disturbed sample of the soil that is used for identification and classification purposes. A Shannon & Wilson field representative observed the drilling, recorded the SPT N-values, visually examined each soil sample obtained, performed field screening using a photoionization detector, and collected the samples into jars for transport to our laboratory. Our field representative did not indicate the presence of potential contamination in any of the borings drilled for this project; therefore, no environmental samples were collected. Our field representative also prepared descriptive logs of the borings including the field observations and measured N-values. The boring logs are presented in Appendix A. The soil samples were returned to our laboratory for examination by a geologist and index testing. The laboratory tests were performed in accordance with the ASTM standards. The 21-1-21761-003-RIfdocx/wp/cIp 2 1-1-2 176 1-003) 4