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GeologzcaCTechrnus Inc Page 9 <br /> Soil Investigation Report <br /> Bank of Stockton <br /> Project No 443 2 <br /> June 19,1996 <br /> 5 Theroximi of the gasoline impacted p ty g p ed soil near the former oil supply <br />' building, and the contaminated domestic water well suggest, but does not <br /> demonstrate that the former gasoline UST may have impacted both the soil <br /> and underlying groundwater, and then migrated into the vicinity of the water <br /> well <br /> 6 The apparent hole in the water well at the 65 foot level is a possible source of <br /> entry of hydrocarbons into the well It is also quite possible that additional <br /> casing holes may exist between 35 and 45 feet which have not yet been <br /> observed due to the presence of opaque water in that interval within the <br /> casing The opacity of the upper part of the water column may be due to <br /> fouling by suspended solids of from biological activity promoted by bacterial <br /> degradation of gasoline in the well <br /> 5.2 Recommendations <br /> Based on the results of this investigation, and in recognition of the above <br /> conclusions, Geological Technics herein makes the following recommendations <br /> 1 A co f this Report should be forwarded the UST <br /> PY ois P Cleanup Fund {USTCFP} <br /> and application should be made to the UST fund to seek reimbursement of <br /> expenses which may be incurred in the assessment and possible cleanup <br /> activities It would seem to be most efficient to all concerned, that this newly <br /> discovered release be covered under the existing UST fund claim <br /> 2 Soil born s <br /> g( ) and at least one groundwater monitoring well should be <br /> installed in the area of the tank pit to help determine the level of groundwater <br /> impact that may be present at the site <br /> 3 An attempt should be made to determine how rapidly shallow groundwater <br /> can enter the well through shallow leaks in the well casing This can be done <br /> by installing an inflatable bridge plug in the water well at a depth of about 50 <br /> feet The well would then be bailed dry and then monitored to determine the <br /> rate at which fluid can enter the well through holes in the casing in the interval <br /> from about 50 feet to 35 feet The fluid entering the well would be sampled to <br /> determine what level of petroleum hydrocarbons it may contain After testing <br /> of the well has been completed the well should be properly abandoned since it <br /> appears to be in poor mechanical condition, and is not suitable as a monitoring <br /> well <br /> I <br />