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LM L' NO FURTHER ACTION REQUEST JAMES L. URBANI CHARTER ELEMENTARY SCHOOL (FORMERLY HERITAGE SQUARE) 640 N. SAN JOAQUIN STREET STOCKTON, CALIFORNIA Lo 1.0 INTRODUCTION Condor Earth Technologies, Inc. (Condor) has prepared this No Further Action Request for the James L. L* Urbani Charter Elementary School, formerly Heritage Square (site), located at 640 N. San Joaquin Street in Stockton, California(Figures 1-3, Appendix A) at the request of David and Marianne Warwick(client), the former property owners. This No Further Action Request includes background information, a risk LN evaluation, an estimate of the contaminant distribution, an estimate of contaminant mass remaining in soil and groundwater, a sensitive receptor survey, and a Checklist of Required Data for No Further Action Requests at Underground Tank Sites for the site. 2.0 SITE BACKGROUND The site is located in a commercial area in downtown Stockton (Figure 1) and is currently known as the James L. Urbani Charter Elementary School (formerly Heritage Square). The existing structure at the site is an unreinforced concrete and masonry building constructed in 1916. This No Further Action Request is for contamination associated with one underground storage tank (UST) located north of the school building(Figure 2). A geotechnical borehole was drilled cast of the buildin.L on February 6, 2002 in the parking lot jointly owned at the time by the clients and the Women's Center of San Joaquin County (Women's Center). The borehole-location is shown on Figure 2. This borehole pierced a metal pipe not identified by Underground Service Alert (USA). A viscous black bunker oil-like fluid seeped from the pipe onto the soil. One soil sample was collected for laboratory analyses before the pipe was repaired to prevent further leakage. The soil sample was nearly saturated with product and was analyzed for total petroleum hydrocarbons quantified as gasoline (TPH-G); total extractable petroleum hydrocarbons quantified as kerosene (TEPH- 5 K), diesel (TEPH-D), and motor oil (TEPH-MO); volatile organic compounds (VOCs); and California �,. Administrative Manual (CAM) metals. Laboratory analyses are provided in Table A, Appendix B. The hydrocarbons detected in the extractable range were primarily TEPH-D and TEPH-MO. TPH-G was also ` detected; however, the chromatogram did not match a typical gasoline pattern. The detection of gasoline- L.ff range hydrocarbons may result from weathering of heavier hydrocarbons. No CAM metals were detected at or above the U.S. EPA Region IX Preliminary Remediation Goal (PRG) values for residential sites or Total Threshold Limit Concentrations(TTLC). Subsequent site investigation activities included excavations, piping investigation and, removal, pipe tracing inside the Heritage Square building, and soil sampling along the piping runs to investigate if a LM release might have occurred. Condor reported the results of these activities in the Underground Pipe Investigation and Removal Report, dated June 24, 2002. Soil samples were collected from the piping t trench excavations on May 22 and 23, 2002(samples T-1 through T-8) and analyzed for TEPH-D, TEPH- MO, and TEPH-K; benzene, toluene, ethyl benzene, and total xylenes (BTEX); and gasoline 6. additives/oxygenates [methyl tertiary-butyl ether (MTBE), ethanol, tertiary-butanol (TBA), di-isopropyl ether (DIPE), ethyl tertiary-butyl ether (ETBE), tertiary-amyl methyl ether (TAME), 1,2-dichloroethane (1,2-DCA), and 1,2-dibromoethane (EDB)]. The laboratory analytical results indicated that none of the �. constituents of concern were detected at or above the laboratory reporting limits in samples T-1 through T-8. Laboratory analytical results for soil samples are presented in Figure 3, Appendix A, and Tables B and C, Appendix B. a.. CONDOR L