Laserfiche WebLink
� o <br /> ASSOCIATES I N C . <br /> from between 36.5 to 40 feet bgs and 41.5 feet bgs, the maximum depth explored, primarily <br /> consisted of lean clay. <br /> ' Soils in approximately borings MW1 and MW2 from the surface to 6.5 to 10 feet bgs consist <br /> of clayey sand. Soils from between 6.5 to 10 feet bgs and 11.5 to 15 feet bgs consist of lean <br /> clay. Soils from between 11.5 to 15 feet bgs and 36.5 to 40 feet bgs consist of elastic silt and <br /> varying amounts of poorly graded sand and lean clay in boring MW1. Soils from between <br /> ' 36.5 to 40 feet bgs and 43 feet bgs, the maximum depth explored in borings MW1 and MW2, <br /> primarily consisted of lean to fat clay. <br /> Soil in boring SB2 from the surface to 40 feet bgs was not identified by lithology because this <br /> boring was advanced in approximately the same location as soil boring SBI and the soil <br /> lithology from the surface to 40 feet bgs was identified in boring SB1. Soil in boring SB2 <br /> ' from between 40 feet bgs and 41.5 to 45 feet bgs consist of lean clay. Soils from between 41.5 <br /> to 45 feet bgs and 51 to 55 feet bgs consist of sandy elastic silt. Soils from between 51 to 55 <br /> feet bgs and 67 feet bgs consist of fat and lean clay. Soils from between 67 feet bgs to 69.5 <br /> ' feet bgs consist of silty sand, clayey sand, and poorly graded sand. From 69.5 to 70 feet bgs, <br /> the maximum depth explored, lean clay with sand was encountered. <br /> Soil in angle boring S132A from the surface to approximately 3.5 feet consists of fill material. Soil <br /> in angle boring SB2A from between 3.5 feet bgs and 1 l to 15 feet bgs consists of lean clay and lean <br /> clay with sand. Soil in angle boring S132A from between 11 to 15 feet bgs and 25 feet bgs. consists <br /> ' of elastic silt. Soil in angle boring SB2A from between 25 feet bgs and 27 to 30 feet bgs consists of <br /> lean clay. Soil from between 27 to 30 feet bgs and 32 feet bgs, the maximum depth explored, <br /> ' primarily consists of sandy silt. <br /> Soil in boring MW4 from the surface to approximately 21.5 to 25 feet bgs consists of elastic silt <br /> ' and elastic silt with sand. Soil in boring MW4 from between 21.5 to 25 feet bgs and 26.5 to 30 feet <br /> bgs consists of poorly graded sand with silt. Soil in boring MW4 from between 26.5 to 30 feet bgs <br /> and 39 feet bgs, the maximum depth explored, primarily consists of lean clay. <br /> 1 Soil boring/well construction logs are contained in Appendix C. A cross section depicting the site <br /> stratigraphy was created and the location of the cross section is shown on Figure 3. The cross <br /> ' section is shown on Figure 4. <br /> 4.1.2 Petroleum Hydrocarbons in Soil <br /> ' A review of historical soil analytical data and field measurements indicate petroleum <br /> hydrocarbon-affected soils are generally present at the highest concentrations in boring SB 1 and <br /> ' the soil samples collected during the over-excavation activities. Petroleum hydrocarbon <br /> constituents were generally detected at depths ranging from approximately 5 to 20 feet bgs. <br /> Petroleum hydrocarbon constituents were not detected in soil samples collected from nearby <br /> angle boring SB2A or from perimeter soil borings MWI, MW2, and MW4 with the exception of <br /> w:1172951reportsldosure.doc 4 <br />