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rj L F RARCA an 4D ,,MP..y Mr. Charles Patel, the owner of C&S One Hour Martinizing, has operated the dry-cleaning business at this location for approximately 19 years. Mr. Patel informed LFR Inc.'s (LFR's) representative that he stopped using tetrachloroethene (PCE) approximately five years ago and began using a silicone-based solvent produced by GreenEarth Cleaning. According to information provided by GreenEarth Cleaning, the silicone-based solvent contains no VOCs, is water soluble, and breaks down into innocuous compounds including water and carbon dioxide. This material is stored in two cylinders located on the side of the dry-cleaning machine. Mr. Patel noted that the filters in the cylinders are replaced approximately every six months. The filters are removed from the Site by Technichem and disposed of as hazardous waste as a precaution to address the possibility that clothing previously cleaned at other dry-cleaning facilities could contain PCE. Local Hydrogeologic Setting The nearest significant surface-water body to the Site is the Calaveras River, located approximately 3/4 mile south-southeast of the Site. Based on boring logs from groundwater monitoring wells installed in the area, the Site is underlain by silt and clay with some sand lenses to the maximum depth explored of 60 feet below ground surface (bgs). The groundwater in this area occurs primarily within flood basin deposits; these consist predominantly of silts and clays, locally interbedded with coarser stream channel sediments. Several groundwater monitoring wells have been installed in the site vicinity pursuant to the ongoing investigation and remediation of a petroleum release. The locations of these wells are shown on the figure included in Attachment 1. According to the most recent data available from these wells, depth to groundwater beneath the Site is 31 to 32 feet bgs, and the direction of groundwater flow beneath the Site is generally toward the east. Results of Previous Investigations LFR completed two phases of soil-gas investigation and a follow-up soil and groundwater investigation at the Site to assess the extent and concentration of PCE in soil gas, soil, and groundwater that may be associated with past operation of the dry-cleaning facility. The methodology and results of the soil-gas investigations are presented in the report titled "Results of a Soil Gas Investigation and Recommendations for Further Work at the C&S One Hour Martinizing Site, Robinhood Plaza Shopping Center, Stockton, California," dated and submitted to the California Regional Water Quality Control Board (RWQCB) on June 17, 2008. A summary of findings from these investigations is provided below. .p-CS-SVE-May09-09366.doc:&h 2