ARCHIVED REPORTS PHASE I ENVIRONMENTAL SITE ASESSMENT

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' Redevelopment Agency of the City of Stockton Page 12 B34602.01 ' 6.0 EVALUATION An evaluation of the PHASE I findings is summarized in the following subsections. ' 6.1 On-SITE Concents The SITE appears to have been in mixed commercial/residential use ' since prior to 1895. Since 1895, the various commercial tenants have included a service station, automotive service and repair businesses, a temple, a church, a restaurant, a beauty shop, a carpet cleaning company, and retail stores. The SITE remains in mixed commercial/residential use today occupied by automotive repair and service businesses (Parcels 1, 6, 15, and 38) and a church (Parcel 33). Although the automotive repair and service businesses were not entered during the SITE reconnaissance, it is considered likely that these businesses use and store hazardous materials including product and waste automotive fluids, fuels, and cleaning solvents. No business plans for the storage of hazardous materials were found on file at the SJCEHD for any on-SITE address. In addition, no information was found indicating the current or former use of UST systems on-SITE except for those formerly maintained on Parcel 1 and Parcel 15. Impacted soil and groundwater have been the subject of investigation and monitoring at Parcel 1 where six UST systems were removed in 1993. As of January, 1997, groundwater underlying Parcel 1 contained petroleum product and constituents at concentrations as high as 460,000 parts per billion. Although a workplan was found for the implementation of a groundwater extraction system and a soil vapor extraction system, no information was found indicating that they have been installed. Groundwater continues to be monitored at Parcel 1 under the oversight of the ' SJCEHD. A UST was reportedly removed from Parcel 15 in June of 1988. No impacts to soil were found in a single soil sample collected from beneath the UST upon its removal and investigative closure was granted to the on-SITE facility in January, 1992. ' The environmental concerns identified at the SITE were not associated with features and/or activities observed there during the reconnaissance, but in association with activities and suspected features within structures on portions of the SITE which were not made accessible during the ' reconnaissance. Specifically, the environmental concerns identified at the SITE are associated with; • the possible presence of asbestos containing building materials within the on-SITE structures; • the known impacts to soil and groundwater at Parcel 1, the result of a release from one or more of the USTs maintained there until 1993; • impacts to soil and/or groundwater underlying Parcels 6, 16, and 38 which may exist in association with current and former automotive repair and maintenance activities at each. ' Twining also considers it possible that boilers were used for heating the on-SITE structures. UST typically used to contain heating fuel were not permitted by the building, tire, or county environmental health department when these structures were built. The only evidence of these