SITE INFORMATION AND CORRESPONDENCE_1987-1992

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LEEDSHILL•HERKENHOFF, INC. 1985, Village Cleaner used the existing dry cleaning machines and setup ' which was installed by the previous owner. The previous set-up consisted of several smaller machines. Since January, 1985, Village Cleaners has con- tracted out for proper disposal of sludge and used filters in compliance ' with existing regulations. As is typical of these operations, solvent recovery was practiced at this facility. Prior to 1985, process waste was sent to a landfill . ' Finest Care Cleaners has been operated as a dry cleaning facility since ' August 1966. From August 1966 to 1979, the facility used a different clean- ing setup than what is presently in use. The basic difference was that instead of filter cartridges, a diatomaceous earth filter was used to filter ' the particles and extract/recover the solvent. The filtered solvent was then distilled and re-processed for use within the system. The entire system was replaced in 1979 by a Renzacci which is currently still in opera- tion. Although not entirely self-contained, all water generated within this unit is either disposed of by a licensed hazardous waste hauler or (in the ' case of the water) used as make-up water for clothes spotting. Finest Care Cleaners has properly disposed of process waste through a licensed hazardous waste hauler since January, 1985. 2.7 Sewer System at Lincoln Village Center The sewer system under Lincoln Village Center (LVC) is owned by Lincoln Properties, Ltd. . Sewage from LVC is generated in two discrete areas, LVC ' North and LVC South. These two areas can be identified by their location with respect to being either north or south of Benjamin Holt Drive which divides the Center. Sewage from LVC North generally flows in a southerly or ' westerly direction toward manhole #4 as shown on Figure 2.5. Sewage gener- ated in LVC South flows in a northerly direction beneath Benjamin Holt Drive and combines with sewage from LVC North in manhole #4. The combined sewage ' then flows through a 10-inch sewer line located just north of LVMD well #1, and enters the sewage system through a manhole located 150 feet north of the intersection of Benjamin Holt Drive and Gettysburg Place. In March 1985, San Joaquin County Public Works (SJCPW) flushed the sewer ' lines at Lincoln Village Center. During the flushing procedure a strong odor was detected by the workers. A sample collected from manhole #4 con- tained PCE at a concentration of 160,000 ppb. Immediately after obtaining 2-13 1