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• 10/10/00 TUE 17:11 FAX 1 916 861 0430 SECOR-SACRAMENTO Z015 Chevron Products Company 6 Former Cbe=n 51adon W$775, 301 West K t i alifomia 2WO RWQCB. The proposed remedial system included an oxygen diffusion system around the southwest perimeter of the site (SECOR, Addendum to April 7 and 27, 2000, Work Flan far Remedial Well Installation and Additional Site Assessment, dated April 27 And 28, 2000.) • May 12; 2000 — Work plan for the installation of interim remedial groundwater and vapor extraction systems was submitted. + May 19, 2000 — The RWQCB approved the installation of monitoring wells proposed in the April 27, 2000 work plan, but did not approve the installation of the proposed remedial wells also proposed in the April 27, 2000 work plan, nor the oxygen diffusion remedial system proposed in the April 28, 2000 work plan. • May 29, 2000 (awaiting G -R) — The RWQCB acknowledged the installation of the interim remedial groundwater and vapor extraction systems by Gettler-Ryan proposed in the May 12, 2000 work plan. + June 5, 2000 -- Construction of the interim remedial groundwater and vapor extraction systems was initiated by Gettler-Ryan. + June 2000 — Marty Hartzell of the RWQCB and Roger HofSmore of SECOR discussed the May 19, 2000 letter (not approving the installation of proposed remedial wells). The possible use of the proposed wells as groundwater extraction wells was proposed by Mr. Hoffmore. Mr. Hartzell stated that pumping from wells other than EX -1 was not approved as such pumping might result in the expansion of the existing plume. Mr. Hartzell agreed that if full- time pumping from well ESC -1 (commenced on July 3, 2000) did not demonstrate control of the plume, pumping from other wells, particularly in the direction of the municipal well, would likely become necessary. June 14 to July 7, 2000 — Ten groundwater monitoring wells (MW -5B, MW -8B, MW- l0A and B, MW -11A and B, MW -12A and B, MW -l3, and MW -14) were drilled and installed at the site by Cascade Drilling. (Monitoring wells MW -13 and MW -14 were approved for installation by SJCEHD on June 20, 2000). (Access agreement for the installation of wells MW -10A and B was received on June 27, 2000). Monitoring wells MW -513, MW -8B, MW -108, MW -11B, and MW -12B were drilled and completed to approximately 90 feet bgs. Monitoring wells MW -10A, MW -11A, MW -12A, MW -13, and MW -14 were drilled and completed to approximately 65 feet bgs_ On July 3, 2000 — The continuous operation of the interim soil vapor extraction (SVE) and groundwater extraction (GWE) remediation systems was initiated at the site, approximately 2-112 months after issuance of the C&A Order by the RWQCB_ 077.41991,04310etober 9, 2000.doc