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Dama, Inc. March 31, 2004 ` B94301.01 Page 10 5.1 Facilities Identified in the Regulatory Lists and Record Review Information provided in the Cypress report was reviewed and evaluated in order to determine which facilities have the potential to impact the Site. The applicable properties are discussed below. The information regarding the following facility was obtained from the San Joaquin County Environmental Health Department(SJCEHD) in Stockton, California, on March 25, 2004. • Knowles Station is located approximately 1,000 feet east of the Site at 1140 West Hammer Lane. This facility has been under investigation since 1992 for leaking underground storage tanks (LUST)formerly located at the facility. Soil and groundwater at the facility have been impacted with petroleum product constituents (PPCs) as a result of unauthorized releases from the UST facility. However, according to Mr. Harlin Knowl with the SJCEHD, ` groundwater flow trends east-southeast at this facility, and yses of water samples collected from groundwater monitoring wells located to the west of the facility have not detected PPCs. Based on the information provided by the SJCEHD, the subject Site is ,. located upgradient of the Knowles Station,with respect to groundwater flow, and there are no indications that the Site soil and/or groundwater have been impacted as a result ofreleases at the Knowles Station facility. Therefore,in Twining's opinion the environmental concern posed to the Site from this facility is considered low. Although several other LUST and hazardous waste facilities are within one-half mile of the Site, based on distance,direction,type of contamination,and/or the closed status,they are not considered to pose a threat to the Site. Therefore, it is Twining's opinion that the environmental concern presented to the Site from off-Site sources appears low. 6.0 SUMMARY OF FINDINGS The findings of the Phase I are summarized in the following sections: 6.1 On-Site The Site is located at 1248 W.Hammer Lane and 1301 W.Joan Avenue,in the city of Stockton,San Joaquin County, California,on one rectangular parcel. The Site appears to have been agriculturally developed from at least 1937 until some time prior to 1950. Since at least 1950, the Site has been .. residentially developed. The property at 1301 W.Joan Avenue was occupied with a residence as early as 1950 and continuing to the present. There is one main residential structure, three garages/workshops, three shacks,tyo domestic wells, and aseptic system located on the 1301 W. Joan Avenue property. The residence is located on the southwestern portion of the Site and can be accessed from W. Joan Avenue to the '• south. The residence is a slab-on-grade,wood frame, single story structure,of approximately 2,000 square feet in area. The garage/workshops are located on the eastern portion of the Site, and are constructed of wood and corrugated tin,built over soil flooring. However,one of the garage floors �• is lined with tin. Combined, the garages comprise approximately 2,000 square feet in area. r