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PRELIMINARY RFPORT AND TANK CLOSURE R@PORT Tracy Boulevard Shell 3715 Tracy Boulevard,Tracy,Calirom'a Delta Project No.40.89-012 Page 4 On February 19, 1990, Delta submitted a letter to the County presenting a soil and ground water management plan for the underground tank replacement project,and on May 16, 1990,Delta submitted a letter addendum to the February 19, 1990,soil and ground mater management plan. LA SuilllLeak Hlstot-Y According to Shell's records, no leaks or spills have been reported at this site. The source of petroleum constiti?ents detected in earlier investigations is unknown. In-line leak detectors were used to monitor the former and new double-walled tanks and the new dispensing lines. The monitoring systems have been checked annually to verify proper function and operations since 1985. All systems have passed each annual test (personal communication, Mr. Bert Russell, Shell Oil Company, 1989). 2.5 V'Fater SuPOLLPVe11 lnvento An inventory of e�dsting water supply wells within a one-half mile radius of the site was conducted by reviewing Csitfornia Department of Water Resources records. A total of 22 wells were identified. Table 1 indicates the owner, owner's address,well location,year drilled, and use of each of the respective wells identified. In general,the wells used Cor domestic water supply have an average depth of approximately 200 ter supply well located on site of unknown Feet and are cased for the first 100 feet. in addition,there is a wa construction and depth. The well appeared to have been installed approximately at the time of site construction and was taken out of use during 1974 when public sewer and water service were connected to the facility. 2.6 Linde rnund Utilities Public utilities are located beneath Tracy Boulevard and are illustrated in Figure 3. Approximate locations _ where utilities enter the site are also indicated. It is unknown at this time whether or not the facility utilized an on-site septic system prior to hookup to the public sewer in 1974. Further, it is unknown whether the -- ---— system was removed or abandoned in place. However, the concrete vault, discovered during station reconstruction activities and described in Section 2.1,may have been parr of an on stte system: – -