Laserfiche WebLink
Shell Distribution Facility, Stockton -7- 23 March 1995 <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Future Annual Reports should clearly summarize trends in contaminant concentration and <br /> distribution, comparing this information to at least the previous year, using graphic and tabular <br /> presentations. Data deficiencies and gaps should be clearly identified. Well construction details <br /> and other previously-acquired information should be presented in appendices as needed, and <br /> should be referenced in explaining the site behavior. Site maps accompanying the Annual Report, <br /> and other reports, should identify all areas or facilities mentioned in the text. For example, areas <br /> SSA-1 and SSA-2 are mentioned in the Annual Report, but are not shown on a map. A reader who <br /> may not know where these areas are must look them up. The Annual Report should be, to the <br /> extent reasonable, a stand-alone document. This would simplify and expedite review. <br /> Additional specific recommendations are: <br /> 1. Shell's consultants should investigate the significance of the "atypical" diesel analytical results, <br /> and should submit their findings, with supporting documentation, to us. <br /> 2. We should be notified at least three working days in advance of installation of new wells, so <br /> that we can observe if desired. <br /> 3. The results of sampling of the new wells MW-28 and MW-29, once they are installed, should <br /> be submitted to us as soon as they are available. <br /> 4. Ground water has been impacted at MW-19, north of the site. This should be verified and <br /> monitored, and the possible influence of the GWE on the occurrences should be evaluated. <br /> Additional hydropunch or well samples should be taken to determine the extent of . <br /> contamination. <br /> 5. Monitoring well DW-1 should be sampled regularly and watched closely for response to the <br /> GWE system. Monitoring wells 25, 26, and 27 should be watched closely for response to the <br /> GWE system, and Shell should include with the first-quarter report a discussion of the <br /> significance of sampling results. These results should be considered in preparation of the <br /> Remedial Action Plan for SSA-3, which is due 1 April 1995. CAO 94-705 requires submittal <br /> of a contingency plan within 30 days of confirmed non-containment of the plume by the GWE. <br /> Also as required by CAO 94-705, Shell shall submit by 1 August 1995, a report evaluating <br /> the deeper-zone contamination in the vicinity of DW-1. <br /> 6. Future Annual Reports should include an estimate of the time necessary to complete <br /> remediation of the site. <br /> GW:gw <br /> Attachment <br />