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Shallow Disposal Well Closure Work Plan WESTERN SQUARE INDUSTRIES 1621 North Broadway, Stockton, California 1.0. INTRODUCTION At the request of Mr. Warren Snider of Western Square Industries, Advanced GeoEnvironmental, Inc. (AGE)has prepared the enclosed Shallow Disposal Well Closure Work Plan for the site located at 1565/1621 North Broadway, Stockton, California. The Iocation 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) by letter dated 14 June 1999 and in accordance with USEPA Region 9 Guidelines_for Closw-e of Shalloti-v Disposal Wells - 1992. The scope of work includes the removal of the shallow well contents, collection of soil samples and laboratory analysis. The purpose of the shallow disposal well closure is to remove the contents of the welIs and collect soil samples to determine if the discharge to wells have impacted the surrounding soils. This work plan provides a description of the excavation and sampling procedures and analysis to be used for closure of the wells. 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 WASTEWATER 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 clarif er 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 neer product line not accommodated by the three-stage wash Iine. Therefore,use of the steam cleaner increased,exceeding the capacity of the clarifier. After increasing the use of the steam cleaning facility, more water was being stored than used. Three unpermitted dry wells were installed at the site in 1996 for discharge of the excess wastewater. The design characteristics for the dry wells are not known, but according to Mr. Warren Snider of .4dvvireedCeoEnironmenta1.Inc.