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1 <br /> rupture/failure The "Case Type" category describes the problem as soil only, and <br /> eliminates the concern for groundwater contamination. Its' "Current Status" <br />' illustrates the disinterest in site investigation, cleanup, or evaluating cleanup <br /> alternatives <br />' A series of five (5) hand auger boreholes were made located around and through the <br /> former positron of Tank B. Soil samples were taken at five foot intervals to a total <br /> depth of 20 feet per borehole Soil samples were caught and transported in <br /> accordance with all state and local requirements to a State certified laboratory for <br /> proper analysis Laboratory analysis of the soil samples taken from these boreholes <br /> indicated low to nondetectable levels of petroleum hydrocarbons These analysis <br />' results indicate whatever hydrocarbon soil contamination exists is in the form of <br /> minor pockets blended with the clean backfill Low TPH levels currently measured <br />' also indicate the biological remediation is in progress, and should be expected to <br /> diminish the presence of hydrocarbons with further time. No Hydrocarbons were <br /> detected below fifteen (15) feet depth suggesting vertical movement was minor and <br />' did not interact with the water table or the capillary fringe <br /> Conclusions <br />' The r <br /> • event work performed by Dufour Environmental best characterizes the site <br /> • The data indicates that there are small pockets of moderate soil contamination, but <br /> are sufficiently limited in distribution and number do not pose any environmental <br /> concern <br /> There are no detectable hydrocarbons below fifteen (15) feet, and no significan � <br /> horizontal migra on. <br /> rThe contaminated small pockets are probably attributable to use of some of the <br /> excavated soil blended with clean fill to backfill the excavation <br /> rRecommendations <br /> r • No further actions are recommended for this site <br /> • Based on data developed in the most recent work, the site qualifies for approval of <br /> closure based on state guidelines <br /> • This report should be submitted to the San Joaquin Local Health District for review <br /> and approval <br /> Limitations <br /> The professional services represented by this report, though limited in scope, have been <br /> performed with the standard of care customarily applied, under similar circumstances, by <br /> reputable environmental consultants practicing in this or similar communities The <br /> DUFOUR ENVIRONMENTAL AND RESOURCE MANAGEMENT <br /> PCP LODI CANNING UST CLOSURE <br /> GSA 3/PCP LODI SAM 10 JULY 1581 <br /> 6 <br />