ARCHIVED REPORTS XR0001049 - Laserfiche WebLink

Home Browse Search

SAM B R I A Ms Vicki McCartney April 6,2006 space analyses Cambria used a photo-ionization detector to screen the soil samples in the field for the presence of organic vapors Soil Classification Cambria observed predominantly silt and clay to depths of approximately 40 to 50 fbg, underlain by varying layers of sand, silty sand, silt, and stiff fine-grained soil to the total explored depth of 100 fbg (Attachment C) ' Backfill Method All borings were backfilled with neat cement grout to match the existing grade Soil Chemical Analyses. Selected soil samples were analyzed for TPHg, benzene, toluene, ethylbenzene, and xylenes (BTEX), fuel oxygenates (MTBE, di- isopropyl ether [DIPE], tertiary-amyl methyl ether [TAME], ethyl tertiary-butyl ether [ETBE], and TBA), 1,2-dichloroethane (1,2-DCA), and ethylene dibromide (EDB) by EPA Method 8260B ~ Groundwater Depths During drilling activities, pore pressure dissipation tests in borings CPT-12, CPT-13, and CPT-17 indicated that groundwater depths in the borings ranged from approximately 19 to 21 fbg This depth to water range is consistent with depth to water measurements in site monitoring wells 1 Groundwater Sampling Cambria collected groundwater samples using CPT water sampling equipment at selected coarse-grained zones within the borings and at intervals correlating to groundwater samples collected during previous investigations Due to fine-grained soils encountered beneath the site, there was insufficient re- charge to collect groundwater samples from the following intervals CPT-14 at 24 fbg and CPT-15 at 25 and 34 fbg Groundwater Analyses Groundwater samples were analyzed for TPHg, BTEX, fuel oxygenates, 1,2-DCA, and EDB by EPA Method 8260B Soil and Water Disposal No soil or water was generated for disposal during this investigation • 5