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i PROBLEM ASSESSMENT REPORT & PROJECT STATUS REPORT OF GROUND-WATER MONITORING Village West Marina 6649 Embarcadero Drive Stockton, California 95209 1.0 INTRODUCTION This Problem Assessment Report and Project Status Report of Ground-Water Monitorins: was conducted in accordance with the directives of the Environmental Health Division of the San Joaquin County Public Health Services (SJCPHS-EHD). It includes a background assessment history, description of Hydropunch' and monitoring well completion activities, ground-water sounding and flow direction/gradient data since July 1994, and laboratory analytical results for soil and ground-water samples collected on July 3 and 7, 1995. 1.1 Site Setting The property is located at 6649 Embarcadero Drive in Stockton, San Joaquin County, California and is situated on the delta levee of the section of the San Joaquin River called Fourteen-Mile Slough as shown on the Vicinity Map, Figure 1. The site includes a restaurant and an operational marina with the capacity to dispense fuel to pleasure craft. The adjacent properties consist of other commercial businesses and residences. 1.2 Geologic Setting The site is located within the delta region of the San Joaquin River on Fourteen-Mile Slough. The surface elevation is about nine feet above Mean Sea Level (AMSL). The slough is situated adjacent to the project area at an elevation below the former underground storage tank invert. The lithology encountered during the drilling of three soil borings (prior to completion as monitoring wells MW-4, MW-5, and MW-6)consisted predominantly of black-gray, micaceous, organic clayey silt to the total depth in each well of approximately 30 feet below surface grade (bsg). Ground water was encountered during the drilling process at about 18 feet bsg in the borings. Generally, the quality of the water is considered poor. W.W. Irwin, Inc. Project No. 33016.05&.06 _: August 1995 1