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i KLEINFELDER 1 2 BACKGROUND 2.1 SITE DESCRIPTION rS The EBMUD maintains an operations and maintenance yard at 1804 West Main Street in StocktoA, California (Site Vicinity Mtt"t, Motu dfic A . 'Ibe tits b auraatlq tl 1 11 ( .{L�• �wi.. �.11• ..�.y�w.�tr several wood a metalamed structures asoes, gara8es► , •• storage and for vehicle refueling. In July 1987, a 1,004Vllon underground diesel and a I 1,000-gallon regular gasoline tank were removed by EBMUD and Universal Engineering. The structures and tank locations are shown on the Site Plan, Plate 3. Soil sampks were i ;.� collected from below the ends of each tank and submitted to an analytical laboratory for analyses. A summary of the analytical results is discussed in Section 22- 2.2 22.2 PREVIOUS INVESIZGATIONS i.j in a report titled"Fatal Report,Removal of Fuel Storage Tanks"dated December 14, 1987, Universal Engineering, Inc. reported its activities concerning the removal of the it underground fuel storage tanks at the project site. Analytical results and other data were reported in a letter from Universal Engineering. Inc. titled "Mud Report Data, ! -.Underground Tank Closure at EBMUD Yard, 1804 West Main Street, Stockton, QV dated January 27, 1988. Laboratory results indicated the presence of gasoline c onotuents E in the soil beneath the east end of the gelsolin tank The soil sample contained benzene at f 10 mg/kg,toluene at 21 mg/kg.#Imes at 66 mg/kg and total hydrocarbons at 940 mg/kg. !'1 Soil samples from beneath tfie concrete vault were collected during the removal of the # U vault by Universal Engineering. Analytical results for soil samples collected beneath the �y diesel tank were none detected. 23 REGULATORY ACTION To date no regulatory action has been taken against EBMUD concerning the removal of i� the fuel storage tank. The SPLHD has approved the project workplan and issued the Ir necessary monitoring well permits. j 1 EBMUD-00140-001 3