SITE INFORMATION AND CORRESPONDENCE 1995-2004

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James L. Tjosvold, P.E. January 25, 1996 Page 2 within eight weeks of obtaining agency concurrence with the remedial action objectives and goals. During subsequent telephone conversations, Fernando Amador (DTSC) and Patricia Sullivan(PG&E) agreed that the Soil OUFS would incorporate a range of remedial goals (which were agreed upon during the telephone conversations) and that the Soil OUFS would be submitted to DTSC by November 8, 1995. On September 15, 1995, PG&E submitted for DTSC's approval an updated project schedule. "The Quarterly Monitoring Report, PG&E Stockton Former MGP Site, Second Quarter, 1995" was submitted to DTSC and the RWQCB on July 28, 1995. The third quarterly groundwater monitoring was conducted during the week of September 4, 1995. The results of this third quarterly groundwater monitoring were submitted to DTSC and the RWQCB on October 31, 1995. II Activities Performed During Current Ouarter: The draft Soil OUFS was submitted to DTSC and the RWQCB for their review and comment on November 7, 1995. The Soil OUFS identified potential soil source areas and proposed a soil remedial action for these source areas. The purpose of the proposed soil remedial action is to reduce the potential for migration of chemicals of potential concern from the soil to the groundwater and to minimize the direct exposure of these chemicals in soil and in soil vapor. The proposed soil remedial action is removal of tar in the former tar pit, combined with in situ shallow soil mixing of other potential source areas using cement binders to solidify and immobilize constituents of potential concern. A treatability study to further evaluate the effectiveness of shallow soil mining at this site was also recommended. Included in the Soil OUFS are the analytical results of supplemental soil sampling conducted at the site in the summer, 1995. A meeting was held on November 30, 1995 between DISC, the RWQCB and PG&E to discuss the draft Soil OUFS. At the meeting, a presentation was made on the potential soil source areas, the soil remediation technologies evaluated during the FS process and the preferred remedial action. The treatablity study proposed for the preferred remedial action (shallow soil stabilization) was also discussed. DTSC and the RWQCB provided their preliminary comments on the draft Soil OUFS at this meeting. Several conference calls were conducted among DTSC, the RWQCB and PG&E in December, 1995 to define and agree on the procedures to be used during the treatability study (e.g. the chemical testing procedures). During one call, PG&E presented the