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27 December 1996 AGE-NC Project No 95-0143 ' Page 4 of 19 ' eight months However, ground water may have risen above the screened interval, potentially preventing the detection of free product in this well The estimated extent of impacted ground water is illustrated on Figure 5 Analytical results of water samples from the monitoring wells, and ' Geoprobe "hydropunch" sampling are summarized on Table 3 A dissolved petroleum hydrocarbon plume has been discovered at the Crystal Cream and Butter Company facility at 404 West Fremont Street, which is located approximately 100 feet west of the subject property According to Mr Steve Sasson of the PHS-EHD, it does not appear that the dissolved hydrocarbon plume at the subject property and that of the Crystal Cream and Butter ' Company have coalesced Several additional sites with potentially impacted ground water are located up-gradient and cross- gradient to the site However, bases on samples collected from monitoring wells surrounding the subject property, the plumes from these sites do not appear to have impacted the subject site ' 4,0 POTENTIAL IMPACT ON NEARBY SURFACE AND GROUND WATER Typically, ground water would represent the migration medium for contaminants over significant distances Sites that are located in up-gradient or equi-gradient directions from the subject property I are not likely to be negatively impacted by the subject property Since the Deep Water Channel is approximately 500 feet up-gradient of the site, impacted water at the site does not pose a threat to beneficial uses of the Deep Water Channel Drinking water near the site is supplied by the City of Stockton from municipal wells The first encountered ground water is not used for drinking or irrigation, although all ground water in the Stockton area is considered to be of potential beneficial use The Cal Water well at Lindsey Street and Edison Street is located at a considerable distance in an equi-gradient direction from the site, and therefore is not likely to be effected by site conditions The nearest down-gradient municipal well is located approximately 2,600 feet northeast of the site The distance of this well from the subject site limits its potential to be adversely impacted by the subject site (Lawrence Livermore National Laboratory, 16 October 1995 and 16 November 1995) 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