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L. %MOO 1.0 INTRODUCTION This health and safety plan (HSP) provides site-specific health and safety procedures to be LW followed during field activities at 400 North El Dorado Street, Stockton, California. The site is the former location of an automobile gasoline station during the 1920s and 1930s. After this period the site was used as a retail tire and automobile service center. In 1967 four underground storage tanks (USTs) were closed in place by filling the tanks with sand. In 1991 one of these previously closed tanks was removed from the site along with eleven other USTs previously located at the site. In May 1997 four slant borings were drilled in the vicinity of the three remaining closed in w. place USTs by Foothill Engineering. Total petroleum hydrocarbons as gasoline (TPHg) were detected in soil samples beneath tank #3 at concentrations up to 16,200 milligrams per kilogram (mg/kg). No groundwater samples were collected during this investigation. In December 1998 two soil borings, BFS-1 and BFS-2, were drilled in the vicinity of the three closed in place USTs by QST Environmental (QST) (Figure 2). Groundwater was encountered in these borings at approximately 28 feet below grade. Groundwater from boring BFS-1 contained detected concentrations of TPHg of 4,200 micrograms per liter (µg/1), and of benzene, toluene, ethylbenzene, and xylenes (BTEX) of 220 µg/1, 400 pg/I, 340 pg/I, and 1,500 pg/l, respectively. MTBE was also detected in groundwater from boring BFS-1 at a concentration of 0.78 pg/I. Of the gasoline related compounds listed above, only xylenes were detected in groundwater from boring BFS-2. L- To determine the nature and extent of impacted groundwater at the site Orion will drill and install three groundwater monitoring wells at the site. Orion will also perform two �,. groundwater monitoring events after the wells have been installed. This HSP presents procedures for personnel and equipment safety, medical surveillance, personal protection, air quality monitoring, exposure control, and general work practices during field activities on site. This plan also describes emergency response procedures if needed. Before beginning work at the site, all field personnel will be required to read this S:\BFS\ST0CKT0N\HSP001] 10/15/99 1-1 6.