Laserfiche WebLink
Final Remedial Plan 4 September 1992 <br /> 3788 Tracy Boulevard Rev. : D1 <br /> tTracy, California P1745R005 .WP <br /> analyzed for TPH-G and BTEX. These compounds were detected in <br />' monitoring well MW-3 , immediately adjacent to the underground <br /> storage tanks, in abundances as high as 550 ug/l TPH-G, 110 ug/l <br />' benzene, 1. 1 ug/l toluene, 94 ug/l ethylbenzene,and 14 ug/l <br /> xylenes. None of these components was detected in the other three <br />' wells. <br />' The wells have been monitored and sampled every three <br /> months since their installation. Results of the laboratory <br /> analyses of these samples are tabulated in Table 3 . <br /> 1 <br />' PROPOSED REMEDIATION <br /> All underground storage tanks and their associated piping <br /> will be removed. Three areas have been identified in which soil <br /> will be excavated and remediated: (A) former waste-oil tank pit; <br /> (B) soil underlying oil-storage drums; and (C) underground product <br /> tanks. Locations of these areas, including the estimated extent of <br /> contamination, may be seen in Figure 3 . <br /> A. Former Waste-Oil Tank Pit <br /> I The identified area will be excavated to 1/2 foot below <br /> the water table. Two types of material will be excavated: (1) pea <br /> gravel fill used to backfill the pit after the 55-gallon waste-oil <br /> tank and surrounding soil were removed in 1990; and (2) surrounding <br /> oil-contaminated natural silt and clay which was not removed during <br /> that excavation. <br /> The pea gravel fill will be hauled offsite for disposal. <br /> Clean imported baserock will be used to backfill the pits within <br /> Ithe range of the water table. The surrounding contaminated soil <br />