Laserfiche WebLink
CAMBRIA <br /> During November 1999, Cambria drilled four soil borings and installed three groundwater <br /> monitoring wells (MW-1, MW-2, and MW-3) at this site The soil borings were drilled in the <br /> vicinity of the dispenser islands to determine if this was the source area Analytical data <br /> collected from the borings suggested the dispenser islands were not the source area The <br /> monitoring wells were installed around the UST complex (Figure 2) Groundwater samples <br /> collected from these wells contained TPHg, benzene, and MTBE Analytical data from these <br /> wells and from previous soil borings drilled in the UST area suggested the UST are likely the <br /> primary source area for petroleum hydrocarbons and MTBE detected in groundwater beneath <br /> this site The findings of this investigation are documented in Cambria's February 10, 2000 <br /> Site Investigation/Fourth Quarter 1999 Groundwater Monitoring Report <br /> Wells MW-1, MW-2, and MW-3 are now on a quarterly monitoring and sampling program <br /> Technical Rationale for Proposed Scope of Work <br /> • The vertical extent of petroleum hydrocarbons and MTBE previously detected to the <br /> vicinity of the UST complex has not been delineated <br /> • Wells MW-1, MW-2, and MW-3 all contain detectable levels of petroleum hydrocarbons <br /> and MTBE The lateral extent of petroleum hydrocarbons and MTBE in groundwater <br /> has not been delineated <br /> • To delineate the vertical extent of petroleum hydrocarbons and MTBE in soil and <br /> groundwater in the vicinity of the USTs we propose drilling two soil borings with Cone <br /> Penetrometer Testing (CPT) equipment Soil and groundwater samples will be collected <br /> from these two borings at depth discrete intervals to define the vertical extent of <br /> petroleum hydrocarbons and MTBE in the subsurface <br /> • To delineate the lateral extent of petroleum hydrocarbons and MTBE in groundwater at <br /> the subject site we propose drilling four CPT borings and collecting groundwater samples <br /> from these borings <br /> • Groundwater flow direction at this site appears to be toward the southwest This is based <br /> on the fourth quarter 1999 groundwater monitoring data and contour map Additionally, <br /> the highest MTBE concentration was detected in well MW-3 which is located southwest <br /> of the UST complex <br /> 0955 4 <br />