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.r Preliminary Site Assessment Work Plan WESTERN SQUARE INDUSTRIES 1565/1621 North Broadway, Stockton, California 1.0. INTRODUCTION At the request of Mr. Warren Snider of Western Square Industries,Advanced Geo Environmental, Inc. (AGE)has prepared the enclosed Preliminary Site Assessment Work Plan for the former shallow disposal well area located at 1565/1621 North Broadway, Stockton, California. The location of the site is illustrated on Figure 1. A plan of the site is illustrated on Figure 2. The work plan was prepared as required by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) as part of shallow disposal well abandonment requirements and in accordance with USEPA Region 9 Guidelines for Closure of Shallow Disposal Wells - 1992. The scope of work includes the advancement and sampling of soil borings and, if necessary, the installation of ground water monitoring wells. The purpose of the investigation is to determine the lateral and vertical extent of contaminated soil and/or ground water resulting from the former usage of shallow disposal wells on the property. This work plan provides a description of boring advancement, soil sampling, ground water monitoring well completion, ground water sample collection and sample analysis. 2.0. BACKGROUND The site is located in a light-industrial area of eastern Stockton, San Joaquin County-, at an elevation between 25 and 30 feet above mean sea level. The site is presently occupied by Western Square _ Industries, a steel fabrication facility. 2.1. SITE OPERATIONS AND WASTE WATER GENERATION Western Square Industries (WSI) fabricates custom steel items (fencing, truck railings) and has been located at the site for approximately 12 years. The facility consists of manufacturing, painting, steam wash line, cleaning and shipping areas. Prior to 1999, waste water from the steam cleaning area drained into a clarifier. Water from the clarifier was then pumped back into a recycling unit and re- utilized in the three-stage wash line. The three-stage wash line and clarifier were cleaned and pumped periodically. In approximately 1996, WSI developed a new product line that increased use of the steam cleaner, exceeding the capacity of the three-stage clarifier. After increasing the use of the steam cleaning facility, more waste water was being generated than could be accommodated by the three-stage _ clairifier, necessitating disposal of the waste water not used in the recycling process. Advanced CeoEmvironmenial.Inc.