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i <br /> PROIILEMASS SSMENT REPORT <br /> ShW[Setvix 5wtiaa <br /> 79I0 Lower Sacramento Road,Stockton,California <br /> Shelf WIC Na 204-7524-0808 <br /> Delta Project No.40-88-147 <br /> Page 14 <br /> 0 <br /> • Chem'ca! eutralizatic� --Oxidizing, :zzucing, or sorbing agents could be injected into the <br /> ` soil/ground water system to render the petroleum constituents nontoxic;howevzr,this technology <br /> is not well defined and is labor and capital cost intensive. Si i5cant s <br /> a't► afety and process control <br /> problems also exist for this type of remediation; therefore„the option of chemical neutralization <br /> l ' will not be discussed further. <br /> i r 0 No ctio --The alternative of no action involves leaving the petroleum constituents in the soil and <br /> leaving the site unaltered. <br /> b- 2�rannd WsLet°Rsmr�tladlon <br /> s The following subsections evaluate the ground water remediation alternatives listed above. <br /> m Ilect o eatrnent and Dls oaf--The remediation of ground water containing dissolved <br /> Petroleum constituents usually involves collection,treatment,and dlspc.a[methods. The collection <br /> ?" techniques can include extraction well and/or interceptor trench constructicn, Treatment methods <br /> 1r„ <br /> can include petroleum product/water separator tanks,aeration,air stripping,carbon adsorption, <br /> ` and/or ultraviolet light destruction. Disposal methods can include direct disposal to a storm drain <br /> or sanitary sewer. <br /> j <br /> Action--The alternative of no action involves leavin fife <br /> .g ground water undisturbed Quarterly <br /> ground water sample analyses for BTEX and TP <br /> H could continue <br /> 1 <br /> 6.3 5uent�t ary <br /> Based upon the review of the alternatives evaluated for remediation of the petroleum constituents in the <br /> Soils and ground water and on the geologic and hydrogeologic conditions underlying the project site, the <br /> following subsections summarize and recommend the best alternative evaluated for remediation of the soils <br /> and ground water. <br /> — - - - a 'Soil-ltemediart�,� $ased upon rhe environmental investigation summarized is this report, it <br /> appears that the ma-ori of the soils containing j 1 ty g petroleum constituents are is the area of the <br /> L former tonic backfill. Based on the <br /> We of soil underlying the site, physical containment or <br /> chemical neutralization of the soil matrix is considered to be impractical. 'I'herefort, the three <br /> alternatives to be evaluated further will be excavation with either on-or off-site trcatmetst and/or <br /> off-site disposal,soil venting,and the no action alternatim <br /> a <br /> r <br />