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' July 24, 2003 <br /> The site's groundwater flow, based on current Monitoring Well information is <br /> northward, at a gradient averaging 0 003 FT/FT declining at an average bearing <br /> of N4 deg W <br /> Soil contamination was not found during installation of MW Nos 5 and 6, <br /> ' however, levels less than 0 3 mg/kg of diesel were found in the well's groundwater <br /> samples <br /> ' Groundwater contamination between 50 to 55 FT bgs exists Diminishing <br /> hydrocarbon contamination has been presumed to extend north of the site's <br /> property While the leading edge waits to be defined, the original underground <br /> storage tanks (USTs) source has been removed, contaminant levels are low near <br /> the north property line fence and the closest operating offsite down gradient well <br /> ' is at least 600 FT away Additionally, residual soil contamination possibly <br /> contributing to the contamination has been identified and a portion is not covered <br /> by structures, removal may be anticipated <br /> ' A summary of all ground water sampling events is included REFERENCE <br /> ATTACHMENT 2, SUMMARY OF LAB RESULTS included with the report <br /> ' Characterization of mobility and direction of any non-volatile advancing plume has <br /> become more evident with the attached March and June 2003 monitoring Expected <br /> attrition and the protection that the leading edge is within a short distance further <br /> north of the property line are being reviewed by Stellar Environmental Solutions, Inc I <br /> expect a closure assessment report within the next two weeks <br /> ' Upon receipt of Stellar's assessment and a strong presumption that some subsurface <br /> soil continues to bear diesel contamination, I expect to furnish your office a proposed <br /> work plan for economically viable remediation of the identified diesel contaminated <br /> soil leading to closure of this site <br /> Qualification of this site and reimbursement of remediation costs from California's <br /> Underground Storage Tank Cleanup Fund needs to be clarified <br /> Please contact me at (209) 369-0482_ f.:.you ve any questions on findings or <br /> recommendations contained in this r ��ti°.�'�` ��►S/04-1 <br /> Sincerely, 1,�� 6,. <br /> eo <br /> Daniel K Barber P E <br /> D K Barrer P E &Associates <br /> szt <br /> ' Attached 2"d Copy to SJ County EHD ` <br /> Cc 1 copy via FedEx to CVRWQCB <br /> Cc Client WOS <br /> Pg 3 <br /> I <br />