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Y ' <br /> Equilon Enterprises -5- February 28, 2011 <br /> Claim No. 4954 <br /> UPDATED, March 2011, the mass of remaining residual'petroleum hydrocarbons <br /> is adsorbed to fine grain soil and dissolved petroleum hydrocarbons are <br /> degrading. One monitoring well (MW-16-50) screened in this area has <br /> consistently had elevated,concentrations of residual hydrocarbons in <br /> groundwater. However, after 21 years of monitoring, the groundwater plume is <br /> largely limited to the UST basin. Analytical data indicate that WQOs have been <br /> achieved in down gradient of the source area. Groundwater within the source <br /> area will likely remain above WQOs for decades to hundreds of years. The Fund <br /> recommends that the San Joaquin County LOP review this site for closure. <br /> Kirk Larson P.G. Date Robert Trommer, C.H.G. Date <br /> Engineering Geologist Senior Engineering Geologist <br /> Technical Review Unit Chief, Technical Review Unit <br /> (916) 341-5663 (916) 341-5684 <br /> i <br /> i <br /> } <br /> California Environmental Protection Agency <br /> P.,*Recyc%d Paper <br />