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ZA-0 101-11=1 ,: - - - $ r � UNION ICE COMPANY 1320 Weber Street, Stockton, California Phase H- Report of Findings STATEMENT OF PROBLE11 Union Ice Company ("UIC') owns and operates an ice manufacturing and cold and frozen storage warehouse facility at 1320 Weber Street, in Stockton, California (Figure 1). The facility is nearly surrounded by the Stockton Deep Water Channel and Mormon Slough (Figure 2). Four (4) underground tanks were removed from this facility in December, 1988. During removal, it was observed that an unauthorized release of hydrocarbons (gasoline) had occurred. WHF Environmental Consultants, Inc. ("WHF") was retained by UIC to act as principal consultants in dealing with this LUST problem. Henkle & Associates acts as geological consultants to WHF, and as such we are the principal geotechnical consultant for the project. In March of 1989, six (6) monitoring wells were installed at the site. One of these wells, MW-4D is a double cased well that tests the second aquifer at the site. Water levels and ground water chemistry have been monitored frequently at the site, since installation of these wells (Plate 1). In May of 1990, a 31 point soil vapor survey was conducted at the site. Soil gasses { were analyzed for methane content and for gasoline equivalent. The soil vapor survey showed that hydrocarbon vapors in the soil were present in an elongated concentration configuration. This configuration was elongated in the direction of the ground water flow direction. Results of the soil vapor survey were reported to San Joaquin County Department of Health in our report of June, 1990. t In February of 1991, a remedial excavation of about 2,000 cubic yards of petroleum contaminated soils was undertaken at this site. In addition to this excavation, an extrac- tion well (XW-8) and a down gradient monitoring well (MW-9) were installed into the first aquifer. In March of 1991, a 12 hour aquifer pumping test was performed on well XW-8. This well was pumped at a constant discharge rate of 4.16 gpm for 12 hours. Drawdown was monitored for this well as well as all other wells on the property during the test. The recovery of these wells was then monitored for 12 hours. The wells were re- sampled in March and April of 1991; the last previous sampling round was in August of 1990. Since the-completion-of the above mentioned work-this report-was prepared.___ The report deals with the above mentioned remedial activities.