SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

Y ', d • • Page 6,Item 20-The CRWQCB states that MTBE plume is migrating vertically while being transported in the down gradient groundwater direction. This statement is false. See Item 6 listed above. Page 6,Item 21 —The CRWQCB states that to date,the dischargers have failed to demonstrate the release has been stopped. ht January,2006,the Site conducted a$26,000.00 tracer test which showed the entire fuel dispensing system was free of leaks Page 6, Item 22—The CRWQCB states that to date, the dischargers have not evaluated threats from vapor intrusion to nearby buildings. In December 2005, results from well EW-4 (210,000 ug/L) exceeded the Region 2 Environmental shallow Soil Screening Levels for MTBE for Commercial Groundwater Vapor Emissions to Indoor Air(80,000 ug/L) Since June 29, 2006,groundwater concentrations for MTBE at well EW-4 have been well below the screening level listed above. Therefore this item is no longer valid and should be removed from the final version. Page 9,Item 33—The Water Board will, on a case by case basis, adopt numerical limitations in orders which will implement the narrative objectives. The site requests that it be held to the same Water Quality Objectives as Flag City Chevron site,which is closer to the CSA 31-2 well(540 feet)than the Site(900 feet). Apex is aware that the Flag City Chevron site is currently going through closure activities with 110 ug/L of MTBE remaining in groundwater. Page 12,Item 3—Already completed. Please read the background section, Items 3 through 13 in this draft. Page 12,Item 5 -The CRWQCB requires evidence to prove the USTs and associated system arc tight and free of leaks Already completed. Praxair Services, Inc performed an enhanced leak detection test in January, 2006. Page 12,Item 6—The CRWQCB states a subsurface investigation to define soil and groundwater MTBE contamination and a soil vapor survey should be conducted on 5-foot centers.