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APPENDIX A - HISTORICAL BACKGROUND CAIN ELECTRICAL COMPANY 230 North Church Street, Lodi, California The site is located in a commercial area of central Lodi, California; adjacent to the site are Lockeford Street immediately to the north, a residence immediately to the south, Church Street immediately to the west, and unoccupied residential property to the east. On-site structures include: an asphalt-covered driveway at the western boundary of the site adjacent to Church Street; a single-story, wooden warehouse building in the central eastern portion of the site; two small, abandoned dwellings on the southern portion of the site; a metal and wood warehouse with concrete-covered flooring at the northern portion of the site that was utilized as a motor and pump repair facility; and a concrete-covered area at the northeastern corner of the site that contained a two-stage, in-ground clarifier. The northeastern corner of the site is adjacent to the repair facility, and was also utilized for motor repair. SITE HISTORY AND CHEMICAL USAGE Cain Electrical Work has been the site tenant since approximately 1950. There have been hazardous materials or wastes generated on the property, namely metals-cleaning solvents. For the past decade, Cain Electrical Works purchased and used the chemicals for degreasing and cleaning that consisted of an approximate volume of two 55-gallon drums per year; however, historical volumes prior to the past ten years, and disposal practices for the hazardous materials or wastes at the site, were undocumented. A detailed site inspection in December 2003 by AGE determined that the northeast corner of the property adjacent to the motor and pump repair facility was the main cleaning and processing area. Metals-cleaning solvents were used in a self-contained, solvent-wash sink located under a small metal canopy; this sink utilizes small quantities of solvent-wash, approximately less than two gallons. Sediments from the washing process were drummed and allowed to desicate on-site. The two-stage, in-ground clarifier at the northeastern corner of the site treated surface water discharge off a small concrete area of approximately 20 feet by 15 feet. This clarifier previously drained into the southern street gutter of Lockeford Street, through a "sunlight" drain pipe under the surface of the sidewalk. Reportedly, some motor and pump parts were washed with fresh water, which flowed into the clarifier, after degreasing with solvent held within the self-contained sink. This water was treated and then may have either discharged into the surface gutter on the southern side of Lockeford Street or evaporated. During the 1980's, installation of a new curb and gutter on the northern edge of the site after road construction on Lockeford Street resulted in the disconnection or plugging of the drain pipe. Currently, without drainage the clarifier fills with rain water and evaporates during the summer and dry months. The two-stage clarifier currently holds water. Advanced GeoEnvironmental, Inc.