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' 18 July 2002 . AGE-NC Project No 96-0254 ' Page 6 of 17 4.0. POTENTIAL IMPACT ON NEARBY SURFACE AND GROUND WATER ' Typically, ground water would represent the migration medium for contaminants over significant horizontal distances However, sites located In up-gradient or cross-gradient directions from the ' subject property are not likely to be negatively impacted by the subject property In addition, first encountered ground water is not used for drinking or irrigation, although all ground water in the ' State of California is considered to be of potential beneficial use Drinking water at and near the site is supplied by the two domestic water wells located on Toste ' Road One domestic well is located on-site (2450 Toste Road) and the second domestic well (2480 Toste Road) is located 300 feet south of the site(see Section 2 3 ) These domestic water wells pose minimal concern because they are located up-gradient of the former UST location Based on I analytical data collected from the up-gradient well MW-3 and the on-site domestic well, the plume does not appear to have migrated beyond MW-3 or impacted the on-site domestic well ' The nearest surface water feature to the site is the Old River approximately 1,300 feet north of the site It is very unlikely that impacted groundwater at the site represents a significant pollution threat to water in the Old River, based upon the distance of Old River from the site and analytical data 1 • collected from the down-gradient monitoring well located at 2420 Grant Line Road (GLMW-3) Indicating that the plume have not migrated beyond GLMW-3 5 0 SOIL REMEDIATION ALTERNATIVES IBased on the distribution and concentrations of petroleum hydrocarbons in soil and ground water on the subject site, and on site-specific conditions, AGE believes excavation and in-situ soil I bioremediation are the appropriate site remediation technologies with the potential to address impacted soil and ground water that should be considered for this CAP Natural attenuation is also evaluated and discussed 5 1 EX-SITU TREATMENT OF IMPACTED SOIL Hydrocarbon-impacted soil can be excavated and treated ex-situ on-site or transported off-site for recycling/disposal On-site treatment alternatives include aeration,bioremediation,vapor extraction, I and thermal destruction,all are feasiole methods for above-ground remediation of soil contaminated with gasoline Off-site disposal generally Involves transportation of the impacted soil to a licensed treatment/disposal facility Advanced GeoEnvironmental,Inc