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30 May 2000 AGE-NC Project No. 97-0372 Page 2 of 17 The directory research indicates that the site was utilized for residential purposes for approximately 24 years from 1935 to 1959, followed by approximately 10 years as an auto body shop from 1971 to 1981, 2 years as California Water Service from 1987 to 1988, and 6 years as RV Circuits from 1989 to 1994. Legal documents show that the subject site was utilized by Arthur Monroe Smith, Jr., Renato Cejo Tupas,Jr., and Celso Tupas who bought RV Circuits,hic. (RV Circuits) in 1987, as a manufacturing facility for a 7-year period from 1987 through 1993. During that time RV Circuits utilized materials during its microplating process and other processes in the manufacturing of circuit boards that have the potential to have impacted building material, soil and ground water on or underlying the site with metals. In addition,RV Circuits was cited and charged with illegal disposal of hazardous waste into the sewer system. Between May 1992 and October 1992, the facility did not have a 30-day period of being in compliance with pretreatment standards. Grab samples from the discharge point on a clarifier contained 14.5 mg/1 copper. Grab samples from the nonmetal bearing stream contained 50 mg/1 ethylbenzene and 0.96 mg/1 copper. In September 1996, a poly tank outside the east wall of the building leaked several hundred gallons of a greenish, acid-smelling liquid that had a field pH of 0. Soil was excavated in the area to remove contaminants. Due to continual illegal disposal of hazardous wastes into the sewer system, the City of Stockton cut off the sewer service to the property in June 1993. The facility continued to operate until late December 1993, storing untreated and partially treated waste water on-site. At the time operations ceased on the property, over 12,000 gallons of partially treated and untreated waste water was left on the site. The secondary containment system on the concrete floor in the south end of the building had pooled waste water on the floor and in sumps. Metals of potential concern included chromium (trivalent and hexavalent),nickel, copper, and lead. Other metals utilized on site in lesser quantities may also potentially have impacted the site, including arsenic, cyanides and tin. Specifics of the site use are presented in Section 2.4 below. 2.1. SITE LOCATION AND DESCRIPTION The former RV Circuits site is located on the southeast comer of the intersection of Worth Street and South Center Street in an area of mixed light industrial, commercial and residential land use. The site is at an elevation between 10 feet and 15 feet above mean sea level (MSL), closer to the 15 feet above MSL. The regional surface topography slopes gently toward the west-southwest to southwest. The irregularly shaped, approximately 32,740-square-foot site is occupied by a 60-foot by 120-foot building, asphalt-paved parking lot and driveway, and a covered concrete-floored area south of the building. Locally, small patches of soil are exposed in disturbed portions of the asphalt. Much of the northern half of the building was utilized for office space and silk screening and photography related Advanced GcoEn,ironmental,Inc