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28 February 1997 F , AGE-NC Project No 95-0144 Page,5 of 20 s Pose a threat to beneficial uses of the Deep Water Channel Drinking water near the site is supplied by the City of Stockton and Cal Water from water wat municipal wells The first encountered ground water is not used for drinking or irrigation, although all ground in the Stockton area is considered to be,of potential beneficial use The Cal Water well at d wit indsey P Street acid Edison Street is located at a considerable distance in an equi-gradient direction from the` mSite, and therefore is not likely to be effected by site conditions The nearest'down-gradient unicipal well is located approximately 2,400 feet northast of the from the subject site limits its pot 'site The di ential to be adversely empa ted by the sub stance offthis well 1 site (Lawrence ' Livermore National Laboratory, 16 October 1995 and 15 November 1995) I { ` 1 5.0 SOIL REMEDIATION ALTERNATIVES 5 1 SOIL VAPOR EXTRACTION' - Soil vapor extraction(SVE) is a well-accepted method of treatment for hydrocarbon-impacted soil and has been used at numerous sites with an excellent rate of success The method is most effective I ti on tiolattle hydrocarbons in permeable soil ,. I 1 1 ` 5 1 1 PRINCIPLES S � 1 Far most SVE systems, a vacuum blower is used to enhance volatilization of hydrocarbons vadose(unsaturated}zone and draw the vapor into extraction wells screened within the containing t Plume The hydrocarbon vapor is drawn from the wells and "treated" iii one Of several possible treatment units (carbon canisters, internal combustion engines, thermal oxidizers and/or catalytic oxidizers) Air injection wells may be installed outside the contaminant plume`to increase to the extraction unit air flow An internal-combustion(IC) system draws the vapor stream into a carburetor system of the internal- F combustion engine and mixes the vapor with air before undergoing combustion Exhaust gasses (oxides of carbon and hydrogen) are further broken down in a catali ' t emitted to the atmosphere These systems require supplemental fuel, such ascaoverter before being patie or natural gas, which can become expensive as vapor concentrations decrease below levels ormally required for ' combustion Typically, internal combustion engines work eff'ectively where in-situ hydrocarbon , concentrations approach the 40,000 parts per million- volume(ppmv)required for peak performace of the engine As concentrations decrease below 20,000 ppiily, supplemental fuel regvirements become burdensome Another disadvantage of these systems is the noise generated by the en ine however, this can be mitigated by placing the unit inside an enclosure, such as a building g , � I 7 V , I