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Review of the Beneficial Use-Protective Water Quality imits for Components of Petroleum-Based Fuels, dated April 28, 2000 by the CVRWQCB indicates water quality limits for MTBE of 5 to 13 ggll. The potential presence of MTBE in groundwater near the former fuel USTs should be confirmed using EPA Test Method 8260 to determine if regulatory groundwater quality limits have been exceeded. The former UST and soil sample locatio is are presented on Figure 4. A copy of the fuel UST removal report and CVRWQCB water quality i mit memo are presented in Appendix B. 3.3 Caltrans Site Permits In December 1993, the EPA issued Caltrans an Environmental Compliance Agreement Regarding Industrial Injection Wells at Caltrans Maintenance Stations. The agreement outlines Federal Safe Drinking Water Act compliance requirements for maintenance wash rack facilities that discharge to septic/leach field systems. EPA defines wash rack/sep is systems as Class V industrial injection wells. The EPA has required Caltrans to close all Class V industrial injection wells in accordance with the EPA Region 9 Guidelines for Closure of Shallow Disposal Wells and applicable state and local regulatory requirements. The septic system can continue to be used for disposal of sanitary waste if the system is in good working condition, the soi is not severely contaminated, all industrial fluids are removed from the tank,and the industrial disch rge is discontinued. Caltrans received a Declaration of Completeness and Accuracy dated December 2000 from the San Joaquin County Office of Emergency Services for Tracy Maintenance Station Hazardous Materials Management Plan. This plan provides information regarding general emergency response procedures and current chemical and waste storage/disposal practices. Copies of the EPA Agreement on Caltrans Maintenance Facilities Septic Systems, the Declaration of Completeness and Hazardous Materials Management Plan,a radio station license,a permit to operate as a small quantity hazardous waste generator, permits for agricultural burning, a hazardous waste inspection report indicating no violations, pesticide use recommendations and a portion of a Storm Water Management Plan and surface water sheet flow map are presented in Appendix C. 3.4 Aerial Photographs Aerial photographs taken between 1968 and 1999 were reviewed at Pacific Aerial Surveys in Oakland, California, and a 1974 photograph was provided by Caltrans. The review was performed to obtain information concerning the history of developme t at the Site and in the vicinity of the Site. Copies of selected aerial photos are presented on Figur s 5 through 7. The following observations were noted during the review of the aerial photographs. Project No.58225-06-146 - - May 25,2001