SITE INFORMATION AND CORRESPONDENCE_1994-1996

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CLEANUP AND ABATEMENT ORDER NO. 94-705 -4- SHELL OIL COMPANY STOCKTON TERMINAL SAN JOAQUIN COUNTY Overall Site Remediation f. By 1 September 1994, submit a report on the soil vapor extraction pilot test. g. By 1 October 1994, submit the soil vapor/ground water extraction system design. h. By 1 December 1994, start operation of the soil vapor/ground water extraction system. i. By 1 August 1995, submit an evaluation report on deeper water bearing zone contamination in the vicinity of DW-1. If the Executive Officer determines that vertical definition of contamination is necessary, by 15 September 1995, Shell shall submit a time schedule for submission of a work plan and investigation report. Upon approval by the Executive Officer, the time schedule shall become part of this order. j. Upon startup of the remediation system[s], operate the remediation systems] continuously, except for periodic and required maintenance. Any interruptions in the operation of the remediation system[s], other than maintenance, shall be reported quarterly to the Board. The report shall include the times and dates equipment was not working; cause of shutdown; and a corrective action plan with a time schedule for implementation to ensure similar shutdowns do not recur. The approved schedule shall become an enforceable part of this Order. k. Ensure that the ground water extraction system[s] "zone of capture"completely envelops and controls the contamination plume[s] (lines of zero contamination in all water bearing zones). If ground water monitoring and sampling results indicate that any part of the contamination plume[s] is not within the "zone of capture", the Discharger shall resample the following month. If noncontainment is confirmed, the Discharger shall submit within 30 days of receiving the sample results a Contingency Plan to mitigate the condition. The proposed actions shall be completed within 60 days of approval of the Contingency Plan. The issues regarding the the deeper water bearing zones are still under consideration and are being addressed under Item i. 1. Maintain a sufficient number of monitoring wells to completely define and encompass the contamination plume[s] (lines of zero contamination in all water bearing zones). If ground water sampling results indicate that contamination has migrated to or past any of the outermost or deepest monitoring wells, the Dis- charger shall resample the following month. If contamination is confirmed, the Discharger shall submit within 30 days of receiving the sample results a work plan for installing additional monitoring wells. The additional wells shall be installed and sampled within 60 days of approval of the work plan. The issues regarding the the deeper water bearing zones are still under consideration and are being ad- dressed under Item i.