SITE INFORMATION AND CORRESPONDENCE

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groundwater contamination near the Busy Bee Laundry and Cleaning site. To more conclusively determine the source and extent of soil and groundwater contamination, the Regional Water Quality Control Board requested Busy Bee Laundry and Cleaning to conduct additional investigations, and install at least three groundwater monitoring wells by July 1991. Busy Bee Laundry and Cleaning requested and was granted an extension of the deadline for submittal of the work plan until December 1991. A work plan for the additional investigations has yet to be received by the Regional Water Quality Control Board. Ecology and Environment, Inc. conducted a Preliminary Assessment of Busy Bee Laundry and Cleaning in April 1991. Groundwater occurs at a depth of approximately 50 feet below ground surface. The unsaturated zone beneath the site consists of at least one 5-foot-thick clay layer, which may or may not be continuous across the site. The inhabitants of Lodi depend on groundwater for all their drinking water. Twenty-four municipal wells form a blended system and supply drinking water to the 53,186 people of Lodi. All the wells are located within 4 miles of the site. The nearest upgradient well (Well 4) is located 0.1 mile from the site and the nearest downgradient well (Well 3) is located 0.3 miles from the site. Both wells have been taken out of service because they are contaminated. The South Main Canal, the nearest source of surface water, transports irrigation water from the Mokelumne River to the farmers south and west of Lodi. The canal water is not used for drinking or recreational purposes. The canal is bermed by a 8- to 10-foot levee. Hazardous wastes generated by Busy Bee Laundry and Cleaning are stored in drums on site before being collected by Technichem, Inc. Busy Bee Laundry and Cleaning operates under a San Joaquin Air Pollution Control District emissions permit and has not violated the permit or received any citations. The pertinent Hazard Ranking System factors associated with the site are: • The past practice of discharging wastewater containing perchloroethylene into the municipal sanitary sewer system has been discontinued. • PCE contamination was detected in municipal Well 3, 0.3 mile downgradient of the Busy Bee Laundry and Cleaning site. Well 3 was put out of service. • The site is a locked, secured building and all hazardous waste stored on site is inaccessible to the general public when the site is not open for business. • Twenty-four municipal wells lie within 4 miles of the site. These wells form a blended system to supply water to the approximately 53,186 residents of Lodi. All of Udi's drinking water is obtained from groundwater. • No residences, schools, or daycare centers are located on or within 200 feet of the Busy Bee Laundry and Cleaning site. SI Busy Bee Laundry and Cleaning-0(F)• 1/93 11 Printed on 50% recycled paper.