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' U-Haul#709-50 Additional Site Charactenzahon Blaes Environmental approximate) 50 feet b s u - y g sing cone penetrometer to provide additional data to define the vertical extent of impacted soil 5) Borehole location DP-6 was located approximately 55 feet northwest of DP-l/DP-2 (Figure 4) Data collected from this borehole further defined the lateral extent impacted soil at the ' site Borehole DP-6 was advanced to approximately 126 feet bgs using the cone- penetrometer rig ' 6) Borehole location HP-1 was located approximately 50 feet south of DP-1/DP-2 (Figure 4) This borehole was used exclusively to collect an in-situ groundwater grab sample to further ' define the lateral extent of impacted groundwater Soil samples were not collected from this borehole 312 Labo atoly Vnalysjjof SQi5aruplo Soil samples collected from the direct-push and cone-penetrometer boreholes were submitted to Kiff Analytical of Davis, California Selected soil samples collected from the boreholes (primarily the total depth soil samples) were analyzed on a 24 hour turn-around time This provided data to determine the maximum drilling depth required to reach non-detectable levels All other soil samples were analyzed with a normal (10 day) turn-around time Soil samples were analyzed for the following constituents total petroleum hydrocarbons as gasoline (TPHg) using EPA Method 8015, benzene, toluene, ethyl benzene, and total xylenes (BTEX) using EPA Method 8260 Two soil samples, one at the lowest sample depth and one with the highest TPHg concentration, from borehole DP-2 was also be analyzed for oxygenated compounds Oxygenate compounds included the following analytes and analysis tert-butyl-aicohol (TBA), methyl-tert-butyl-ether (MTBE), di-isopropyl- ether (DIPE), ethyl-tert-butyl-ether (ETBE) and tert-amyl-methyl-ether (TAME) using EPA method 8260 The certified analytical reports provided by the laboratory are included in Appendix D 33 ITE CHARAERIZATI N- R TATER Due to the recent groundwater level, the screen interval of the eight pre-existing monitor wells at the site became submerged Blaes Environmental proposed the installation of new monitor wells to complement the existing wells (Figure 4) to continue monitoring groundwater conditions The new nested ( casings s two per . borehole) wells incorporated screen intervals that will accommodate the large swings in groundwater Ievel 10 f