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1 _ <br /> 1 <br /> ECREED <br /> . 0 21145 <br /> Mr Jeff Wong MAY <br /> 1 May 4, 2005 VENj �,�TH 0 SES <br /> Page 2 �N <br /> Cumulative groundwater sampling results are summarized in Table 1 A map depicting dissolved <br /> concentrations of TPHd, TPHg, benzene, and MTBE in groundwater for first quarter 2005 is <br /> 1 included as Figure 4 A copy of the certified laboratory analytical report with chain-of-custody <br /> documentation is included in Attachment C <br />' Conclusions/Recommendations <br /> MW-1 has not had any reportable concentrations of petroleum hydrocarbon constituents for <br />' over ten years MW-2 did not have any reportable concentrations of petroleum hydrocarbon <br /> constituents during the first quarter 2005 event Reported concentrations in MW-3 have <br /> remained below the laboratory reporting limits since the fourth quarter 2004 event TPHd <br /> remained below the laboratory reporting limits in MW-4 for the second consecutive quarter <br />' Based on the systematic demonstrated natural attenuation through time in concentrations of the <br /> chemicals of concern, groundwater at this site does not pose a threat to human health or the <br /> environment, and in our opinion, this site should be closed from an environmental standpoint <br />' Future Work <br /> • Upon approval of site closure, the groundwater monitoring wells will be properly abandoned or <br /> destroyed in accordance with San Joaquin County Public Health Services Department <br /> requirements <br /> I <br /> • JIProjects10502710311WorkingW5027-031-1stQtr05-QMRdoc <br /> I <br /> ® Celebrating 35 Years of Excellence in Environmental Services <br />