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2 The hydraulic gradient is very low, generally in an easterly <br /> direction, but with some manor variations This agrees with the <br /> regional gradient, which is to the east-northeast <br /> 3 A soil gas vapor survey conducted in March, 1993 , showed that <br /> the contamination appears to be restricted to the northwest end <br /> of the property in the vicinity of the removed UST' s The data <br /> obtained also supports our belief that an offsite source exists <br /> to the west and/or north of the site PLATE 11 is from the <br /> report discussing that survey, and shows the inferred limits of <br /> soil contamination <br /> 4 A title search that was recently conducted did not identify <br /> any obvious offsite sources of contamination <br /> 5 The very low gradient and manor changes in water level <br /> suggest that there is very little movement of the groundwater <br /> beneath the property These conditions could indicate the <br /> presence of a perched water table in the area If that is so, it <br /> j might account for the high levels of contamination encountered <br /> beneath the property - aquacludes above and below the sand body <br /> have effectively prevented the migration of the hydrocarbons away <br /> . from the site <br /> Although we stall believe that some of the contamination found to <br /> exist beneath the property is from another site, such an offsite <br /> source has not yet been identified The San Joaquin County EHD <br /> does not agree with that conclusion, and has ordered additional <br /> monitoring wells be placed in order to further define the extent <br /> of contamination Quarterly monitoring of existing wells , and <br /> new ones when placed, is to continue as before Our client will <br /> comply with those instructions, and the County EHD and RWQCB <br /> personel 1 be kept informed of activities as they occur <br /> WmVeth <br /> ter & Associates <br /> ccchez <br /> hayer, CVRWQCB <br /> wCa <br /> b �71ii116 O � <br /> ��CAu <br />