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Stantec <br /> April 30, 2010 <br /> Page 1 of 4 <br /> Reference: First Quarter 2010 Site Status, Groundwater Monitoring and Remedial Summary Report- <br /> Stockton Terminals Technical Committee Facilities <br /> Appendix K-Ozone Injection Well Monitoring Program and Revised Contingency Plan <br /> REVISED CONTINGENCY PLAN <br /> The following represents the key elements of the Revised Contingency Plan as recently agreed to <br /> by STTC and the RWQCB. The details of the history and background of the contingency plan as <br /> well as concerns raised by the RWQCB and STTC's technical perspective are outlined in <br /> Stantec's September 19, 2008 Response to RWQCB July 30, 2008 Letter and <br /> November 7, 2008 Revised Contingency Plan. The agreement of the RWQCB to the Revised <br /> Contingency Plan is documented in the RWQCB's December 15, 2008 letter entitled, Third <br /> Quarter 2008 Site Status, Groundwater Monitoring and Remedial Summary Report, Stockton <br /> Terminals Technical Committee Facilities, Port of Stockton, San Joaquin County(Letter). <br /> COMPLIANCE WELLS <br /> STTC'S September 19, 2008 Response to RWQCB July 30, 2008 Letter detailed the <br /> developmental history of compliance wells, compliance analytes, compliance limits, and the <br /> contingency plan by referencing the various meetings, documents, and temporal framework in <br /> which they were established. The compliance analytes, compliance wells, and contingency plan <br /> were originally established in SECOR's June 27, 2003 Response to RWQCB Letter Dated <br /> May 9, 2003 And Addendum to Corrective Action Plan Dated April 30, 2003 (Response and <br /> Addendum). <br /> From SECOR's June 27, 2003 Response and Addendum, this revised table of compliance wells <br /> and a description of their purpose is repeated below: <br /> Remedial Mid-Point <br /> Groundwater Observation Observation Trigger <br /> Zone Wells Wells Wells <br /> A PS/MW-18, PS/WC-1S, PS/MW-20A OW-2A, OW-4A <br /> AR/MW-21A <br /> B AR/MW-18B, AR/MW-21 B, PS/MW-20B OW-213, OW-413 <br /> PS/WC-1M <br /> This table differs from the original table in SECOR's June 27, 2003 Response and Addendum in that <br /> the Mid-Point Observation Wells PS/MW-20A and PS/MW-20B replaced the damaged well PS/MW-20 <br /> effective fourth quarter 2008. <br /> Selected "A" and "B" zone wells compliance wells are monitored quarterly to determine the <br /> effectiveness of the ozone sparge remediation. These compliance wells include the Remedial <br /> Observation Wells, Mid-Point Observation Wells, and Trigger Wells as listed above. The criteria <br /> for implementing the contingency plan is outlined below for the Remedial Observation Wells and <br /> Trigger Wells. A point of clarification regarding the Mid-Point Observation Wells which were to <br />