ARCHIVED REPORTS XR0010398 - Laserfiche WebLink

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adversely impact water quality, health or other beneficial. uses. [Section 10 2. BACKGROUND The site was an empty field prior to world War II . The front portion of the real property is reported to have been used to store and work on automobiles commencing in 1952 . This property has been reported to have been an automobile wrecking and/or junk yard from 1975 to 1990 . The site, reportedly, was used from approximately 1989 by Capitol Auto Wrecking, an automobile wrecking _yard and Town and Country Tire Service, a tire service facility. The site of approximately 4. 9 acres currently has a wooden truss manufacturing facility on it and is located in the topographically flat, commercial/residential area of eastern Tracy. There are two buildings on site each being approximately 3, 000 square feet in area. One building is a one story cinder block structure with a concrete floor and the other a wood framed building with corrugated steel siding on a concrete pad. Also on site was a water supply well with pump, which was destroyed on 1998, in accordance with applicable regulatory requirements. Figure 1 is a site location map. Figure 1 contains elevation contours, the nearest surface waters, buildings, streets, railroads, and transmission lines. Water, sewage an other utilities are reported to be buried in the streets. An Underground Storage Tank (UST) was removed from this site on July 19, 1996 . The 350 gallon tank reportedly was an unleaded gasoline UST. Figure 2 is a plan of the subject property. Soil samples collected from the bottom of the excavation at the time of the UST removal were analyzed for Total Petroleum Hydrocarbon as gasoline (TPHG) ; Benzene, Toluene, Ethylbenzene and Xylene (BTEX) . The soil samples taken below the UST in native soil showed 4, 300 and 540 parts per million (PPM) TPHG at 6 . 5 and 9 feet below grade. The results of these analysis were documented in a report by JPCA dated August 12, 1996 . Soil was excavated to about 10 feet and aerated. The excavation was reportedly left open for approximately one year. The excavation was then reportedly back filled with clean fill in October 1997 . The Unauthorized Leak or Spill Form is contained in Appendix A. Four Monitoring Wells were constructed in November 1997 . The soil in the upper five feet had minor concentrations of hydrocarbon contamination. No detectable contamination for the oxygenates was found in the soil samples. The groundwater had less than 1 PPM TPHG and 20 ppb Benzene contamination. One groundwater sample from MW-3 had 5 . 6 ppb of 2