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- <br /> .�, <br /> .f <br /> x <br /> f <br /> x <br /> F <br /> RECOMMENDATIONS <br /> To further evaluate the extent of petroleum hydrocarbons in the soil and groundwater <br /> underlying UNOCAL Bulk Plant No.0788,PACIFIC proposes the installation of three <br /> additional groundwater monitoring wells at the locations shown on Figure 6. The <br /> proposed monitoring well adjacent to the warehouse will provide upgradient <br /> information on background hydrocarbon concentrations. The proposed well located <br /> north of the bulk tanks will evaluate the downgradient extent of hydrocarbons. .The <br /> r well proposed west of the above-ground storage tanks is intended to provide lateral <br /> definition of the dissolved hydrocarbons present in the groundwater. Four shallow soil <br /> borings will also be drilled at the locations shown on Figure 6 to further evaluate the <br /> source and extent of hydrocarbons in the soils underlying the site. <br /> s A quarterly groundwater sampling and analyticalprogram has been implemented. The ' <br /> 3 <br /> data obtained from the installation and sampling of the site wells (including WSW-1) <br /> 4 will be utilized for geologic and hydrologic characterization of the site, in addition to <br /> further defining the extent of hydrocarbon migration. <br /> f <br /> i <br /> ' L <br /> 6 <br /> i F <br /> J <br /> 4 yf <br /> y <br /> k <br /> 3100101/REPORT 8 February 13,1991 <br />