ARCHIVED REPORTS XR0001060 - Laserfiche WebLink

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CAMBRIA in the field for the presence of organic vapors using a photo- ionization detector Groundwater samples were collected with CPT water sampling equipment at approximate 10-foot intervals Due to fine-grained soils encountered beneath the site, there was insufficient re-charge to collect groundwater samples from the following intervals CPT-1 at 20, 33, 40, and 60 feet below grade (fbg), CPT-2 at 20 fbg, CPT-3 at 20 and 40 fbg, and CPT-4 at 20, 30, and 40 fbg Number of Borings Four soil borings (CPT-1 through CPT-4) Boring specifications are described in Table 1 and locations are shown on Figure 2 Boring Depths 50 to 85 fbg Groundwater Depths During drilling activities, pore pressure dissipation tests indicated groundwater depths in the borings ranged from approximately 16 5 to 18 5 fbg This depth to water range is consistent with recent depth to water measurement in site monitoring wells Sediment Lithology Lithology encountered while drilling the borings consisted primarily of silt (ML) to depths of approximately 72 to 77 fbg, underlain by sand (SP) and silty sand (SM) to the total explored depth of 85 fbg (Appendix B) One of the borings (CPT-1) encountered a shallow sand layer extending from approximately one fbg to 12 fbg Boring CPT-1 was drilled in the former UST location The sand layer encountered in this boring is likely fill material placed in the former UST excavation Soil Chemical Analyses Selected soil samples were analyzed for total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, xylenes (BTEX), and methyl tertiary butyl ether (MTBE) by EPA Method 8015/8020 (Modified) . Soil Physical Analyses Selected soil samples are currently being analyzed for intrinsic permeability for water, effective porosity, density, and 0778 3