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' 17 February 2004 • AGE-NC Project No 96-0254 ' Page 6of10 water at depths less than 200 feet bsg is not used for drinking and less likely may be used for ' irrigation, all ground water in the State of California is considered to be of potential beneficial use Drinking water at the site is supplied by the City of Manteca Municipal Water Well Network, City ' of Manteca Water Well Number 13 Is closest to the site(2,500 feet southwest) Municipal water well number 13 poses minimal concern because the well is 2,500 feet away and located cross-gradient of the former UST location Based on analytical data collected from the cross-gradient wells MW-5 and MW-6, the MTBE plume does not appear to have migrated beyond MW-5 or MW-6 ' The nearest surface water feature to the site is the Stanislaus River approximately five miles south of the site It is very unlikely that impacted ground water at the site represents a significant pollution threat to water in the Stanislaus River,based upon the distance and direction of the Stanislaus,River ' from the site ' S 0. SOIL REMEDIATION ALTERNATIVES Based on low concentrations of TPH-d In soil samples collected during the UST removal and ' . over-excavation and the concentrations of MTBE detected in soil samples collected from the water bearing zone, AGE believes soil remediation is unnecessary 6.0. GROUND WATER REMEDIATION ALTERNATIVES r 1 AGE recognizes that two methods for remediation are readily applicable for the contaminate at the site, one consists of ground water extraction/treatment and disposal and the second is use of the to-situ ozone oxidation-sparging AGE believes the use of the in-situ mechanism is the appropriate ' remedial technology to be consider to address MTBE-impacted ground water on the site ' 6 1 GROUND WATER EXTRACTION ' There are several different methods for treatment of extracted ground water,which are collectively called "pump and treat" As the name indicates, all methods involve extraction and transfer of contaminated ground water from the aquifer to an above-ground treatment or disposal/recycling ' facility The extraction is performed using an automatic pump system to maintain capture characteristics to the aquifer and to assure that process volume requirements are maintained After treatment, the water is usually discharged into a sanitary sewer and a sanitary sewer connection is available at the site tAdvanced GeoEnvironmental,Inc 1