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June 1996 - 1 - 953-7001002 1 INTRODUCTION This report summarizes the investigation and remediation activities associated with a petroleum hydrocarbon release at the Union Ice Company facility (the site) located at 1320 1 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 This revised closure report was prepared pursuant to comments from the SJCHD dated April 18, 1996 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,California 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 buildings and asphalt pavement with the exception of an approximately 13,000 square foot area 12 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-gramed 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 i 13 Groundwater The shallow groundwater flow direction is to the southeast The depth to groundwater at the site has ranged from approximately 7 to 13 feet over the period April 1990 to September ' 1995 (WHF, 1990, 1991, 1992, 1993, and 1994,Levine-Fricke,1993, 1995,and Golder, 1995) The regional groundwater flow direction, is also to the southeast(URS, 1989) The historical summary of depth to groundwater is presented on Table 1 Potentiometric Maps are presented in Appendix A The site is bordered by the Stockton Deep Water Channel to the north and west and the Mormon Slough on the east and south 8537001 R01(7!3!96) Golder Associates