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ACI-P-97-1006 <br /> Ranch Market - Phase II Page 5 <br /> 8 DISCUSSION AND RESUL3:S <br /> The analytical results of the soil and water samples indicated detectable concentration of <br /> TPHg and BTEX constituents in all soil samples collected from soil boring B-1 at depths <br /> ranging from 20 to 30 feet blow grade <br /> The analytical results of the so and water sample indicated non-detectable concentrations of <br /> Oxygenates Compounds in all samples except in the groundwater sample, where Methyl-tert- <br /> butyl ether was detected at a concentration of 2300 Ug/L as shown in Tables I. and 2. <br /> 9 CON!CLUSTO A E E l <br /> From the data collected during this phase of the investigation, Arrowhead Consultants, Inc <br /> concludes that a significant release of hydrocarbons has occurred and has impacted both the <br /> soil and groundwater beneath the site <br /> Therefore, ACI recommends that further assessment work be performed on the site by the <br /> installation of additional soil borings and groundwater monitoring wells to delineate the lateral <br /> and vertical extent of contamination at the site Quarterly groundwater monitoring will also <br /> be required, <br /> IO MTOCOLS <br /> Borehole Drilling <br /> All down hole equipment was decontaminated, using stem to clean off all soil prior to use <br /> The borehole was drilled with continuous flight, hollow stem auger <br /> Soil samples were collected ever 5 feet and blow counts were recorded A core of the <br /> capillary fringe was obtained The well was logged geologically The presence of <br /> hydrocarbon product (if any) was tested All drill cuttings and fluids generated from the <br /> decontamination of equipment were placed,n separate drums The intervals at which the drill <br /> cuttings were obtained are recorded on the drum The drums remain stored at the site <br /> pending further analysis and proper disposal <br />