SITE INFORMATION AND CORRESPONDENCE

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Mr. Thomas Bauhs -2 - 16 June 2005 �. Ms.Kitty Walker shall be collected within an eight-hour period. Groundwater sampling activities for all wells requiring sampling shall be collected within five days. If the OUs are collecting water levels and performing sampling separately,the activities must be coordinated to meet these requirements." The L&M OU did not comply with this requirement 2. Section 14.1 needs to correct the dates of August 2 and 3 to 2004, not 2005. 3. Based on the results of the sampling, the lateral and vertical extents of pollution are not defined. Comments on the Response to Comments 4. In Response to Comment 1, DTSC appreciates SECOR's willingness to begin operation of the soil vapor extraction (SVE) system. However,DTSC is, and has been, willing to accommodate L&M OU's desires to move forward with the startup of the SVE system provided that data required by both the RWQCB and DTSC is collected prior to and during SVE system operation. These requirements were discussed and agreed upon during the 28 February 2005 meeting, and identified in subsequent correspondences. 5. In Response to Comment 5, there is no information provided regarding the four 20,000 gallons tanks. The L&M OU needs to provide information about the specific identification of these tanks and their contents. 6. The Response to Comment 7 is inadequate because the figure in Attachment D does not discuss or show "well sealing." The L&M OU still needs to provide information on"well sealing." 7. The Response to Comment 8 references a 2-inch pipe discovery. It is not clear where this is documented or explained. The L&M OU needs to discuss the location and material surrounding the pipe to assess the purpose of the pipe. 8. The Response to Comment 11 is inadequate. The fixture land use is only one aspect in the determination of a screening level. The L&M OU needs to discuss whether the proposed screening level is appropriate for the protection of all the beneficial uses of the groundwater. Furthermore, the L&M OU needs to remove as much mass as possible from the soil to prevent continued leaching into groundwater. 9. The Response to Comment 17 is adequate regarding pipes that may only extend into West Weber Avenue,but it does not adequately address any pipes that extend beyond that. The L&M OU needs to address the pipes that extend beyond West Weber Avenue. Comments on the Revised Work Plan 10. DTSC will respond to Attachment B of the Revised Work Plan under separate cover. 11. Based on Figure 2 of the Revised Work Plan, it appears that dual phase extraction wells DPE-5, 6, and 7 are within the recent excavation areas. The L&M OU needs to discuss how the liner was installed around these DPE wells or correct the figures to accurately reflect the excavation areas.