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February 1996 - 1 - 953-7001002 1. INTRODUCTION tThis report summarizes the investigation and remediation activities associated with a petroleum hydrocarbon release at the Union Ice Company facility (the site) located at 1320 Weber Avenue,in Stockton, California (Figure 1) ) The San Joaquin County Health Department,Environmental Division (SJCHD) is currently providing regulatory oversight for the project and they have determined closure criteria for the site This report documents ' that the SJCHD's criteria for case closure have been met ' 11 Site Description Union Ice Company owns and operated an ice manufacturing and cold and frozen storage warehouse facility at 1320 West Weber Avenue,in Stockton,Cahforrua The approximately 13 acre site is within the City of Stockton(Figure 2) It is located in a portion of the S 1/2, Section 10, Township 1 North,Range 6 East It is bordered on the south and west by the Mormon Slough and to the North by the Stockton Deep Water Channel (WHF, 1992) The ' site is relatively flat,with an average elevation of about 10 feet above mean sea level Most of the site is covered by building and asphalt pavement 1.2 Stratigraphy The site is underlain by Holocene Age fluvial deposits of the San Joaquin River The stratigraphy of the site is characterized as interbedded clay/silt units with sand/gravel units (WHF, 1994) The uppermost clay/silt unit is a red,brown clay to silty clay with local ' carbonaceous fragments and peat lenses and extends from the surface to depths between 15 to 17 feet This unit is underlain by a fine to coarse-grained sand with local gravel units from depths between 15 to 35 feet below ground surface(bgs) This sand unit is underlain by a ' stiff uniform blue-gray stiff clay to depths of 50 to 58 feet bgs The boring log for well MW-4D indicates that this clay unit is underlain by a silty sand of unknown thickness (WHF, 1994) The second water-bearing zone is a sand that extends from 50 to 58 bgs to at least the maximum depth explored of 615 feet {' 1.3 Groundwater The upper most groundwater flow direction is to the southeast The depth to groundwater at the site is approximately 10-12 feet The regional groundwater flow direction, is also to the southeast (URS, 1989) The depths to groundwater in September 1995 are presented on Table 1 The site is bordered by the Stockton Deep Water Channel to the north and west and the Mormon Slough on the east and south 1 9537001 R01(3!1/86) Golder Associates