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Phase I-Environmental Snc: Assessment Page 8 8-23 Acre Parcel, 3291 South Highway 99 Stockton, California April 24, 1998 CTB Job No. 20-0641 Documents supplied by San Joaquin County include well sampling data, correspondence regarding lead discharge into the septic system, a copy of the environmental health permit for the well, and water system inspection reports. Highlights of these documents are summarized below: • The only known use for the building at the site was the manufacture of circuit boards for alarm systems. The building was build in approximately 1982 for Datura Intemation by Rock construction_ Blueprints (dated April 19, 1982 and revised on June 2, 1982)showing the layout of the site and locations of utilities were examined and used to create the site map shown in Figure 2. In the early 1990s, the facility was acquired by Scantronic Inc./Arrowhead Technologies. • A groundwater sample collected from the well on February 15, 1983 had a result for manganese of 0.09 mg/L, slightly above the California Administrative Code, Title 22 Maximum Contaminant Level (MCL) of 0.05 mg/L. Lead was not tested at this time. A Water Inspection Form dated March 11, 1987 recommended analyzing for manganese by April 11, 1987. Further manganese data were not present in the available documents. Other Water Inspection Forms from the San Joaquin Local Health District for the period from March 1984 to October 1990 show no significant problems with the water system. Selected water analyses data for coliform bacteria were provided from 1986 through 1996. Review of these data show the absence of coliform bacteria from the.well except for two. occasions: 1)February 6, 1996 sampling result(present in total coliform analyses, absent from fecal test), and 2) February 9, 1996 sampling(4 successive samples -presenffor total coliform, absent for fecal test). Coliform was absent in a subsequent sampling on March 20, 1996 • A letter from the San Joaquin Local Health District dated July 26, 1988, directs the company operating the plant at 3291 South Highway 99, Datura International,Inc. to cease discharge of industrial waste to the septic system and have the well tested for heavy metals. Subsequent letters suggest that the source of this industrial waste is effluent from the circuit board washer in the soldering room. This wash equipment was responsible for approximately 75% of the total outflow to the septic system, and averaged 2 gallons per minute (letter from Jack Junges, Arrowhead Technologies, to Ms. Antonia Vorster, California Regional Water Control Board, February 22, 1990). A field investigation was subsequently performed on April 10. 1990, to determine if the waste effluent from the facility caused lead contamination in the surrounding land to be in excess of that allowed by taw. Six borings were made, four near each of the four leach lines, one for background concentrations near the highway, and one at the opposite end of the property.