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3.4 SITE HISTORY 3.1 Historical Research Report A Historical Research Report, Tracy Caltrans Maintenance Station, prepared by Sarah Lim, MS Historian, dated April 23, 2001 is presented in Appendix A. Review of the report indicates that in the 1890s the Site was owned by A. Grunauer and L. Kroner. Between 1900 and the 1950s, the Site was owned by members of the Krohn family and in 1960 the tate of California owned the Site and right- of-way along Highway 50 (currently I Vh Street). The Site was developed in 1970 and was referenced at 24155 Corral Hollow Road. In 1985,the Site was referenced at 1150 Corral Hollow Road, and in 1993 at 2005 Krohn Road. According to the city directories reviewed, in the 1970s commercial and residential development was located along Byron Road northwest of the Site and along Corral Hollow Road south of the Site. In the early 1990s, cominercial development was located in the site vicinity along I Ph Street. Copies of a land and buildings inventory, building permits, grant deeds, parcel maps and city directories are presented in Appendix A. 3.2 Previous Environmental Conditions Information regarding the use, storage and disposal of hazardous material/waste and previous environmental investigations performed at the Site was obtained from a review of onsite records and information obtained from the Caltrans District 10 office in Stockton, California, and the SJCEHD in Stockton, California. Copies of pertinent site-specific in rmation are presented in Appendix B. In April 1988, one waste oil UST was removed from th Site. No further documentation regarding the waste oil UST removal activities was available. In September 1996, one steel 7,600-liter (2,000- gallon)gasoline UST and one steel 7,600-liter(2,000-gal on)diesel fuel UST were removed from the Site. The USTs were reportedly in good condition and stains or holes were not noted. Laboratory results indicated that total petroleum hydrocarbons as gasoline (TPHg), benzene, toluene, ethylbenzene, total xylenes (BTEX) and methyl tert-bu 1 ether (MTBE) were not detected in soil samples collected from the bottom of the former gasoline UST excavation. Total petroleum hydrocarbons as diesel (TPHd) was not detected in soil samples collected from the bottom of the former diesel UST excavation. Total lead concentrations ranging from 1.5 to 9.2 milligrams per kilogram (mg/kg) were detected in soil samples collected from the former gasoline UST excavation. Groundwater was encountered at approximately 3.3 in (H feet)bgs during UST removal activities. TPHg, TPHd, BTEX, and total lead were not detected ir a grab groundwater sample collected from the excavation. MTBE was detected in the grab groundwater sample at a concentration of 31 micrograms per liter (µg11). The reported presence of M BE was based on EPA Test Method 8020 data and may represent a false positive. The San Joaqitin County Environmental Health Division (SJCEHD) issued a `no further action' letter in January 1997 (misdated January 3, 1996) for the fuel UST removals. The SJCEHD issued a `no further action' letter dated January 3, 1996 (sic 1997). Project No.58225-06-146 -7- May 25,2001