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5.0 CONCLUSIONS AND RECOMIIZENDATIONS
<br /> With the exception of MTBE detected in the groundwater sample from boring 131-2, there are
<br /> no indications of PHCs in soils or groundwater at this site. The total lead concentrations found
<br /> in soils are within the range of background levels for the area and well below the TTLC values
<br /> set by the State and the preliminary remediation goals set by the US EPA. As outlined above,
<br /> the risk posed by MTBE in groundwater in the vicinity of this site appears to be minimal, and
<br /> as such there is no significant environmental condition which might constitute an immediate
<br /> threat to human health and safety or to the environment. It is therefore B&Rs recommendation
<br /> that no further site investigation or remedial action is necessary.
<br /> 6.0 REFERENCES
<br /> Bartow, J. Alan and Tor H. Nilsen, 1990, "Review of the Great Valley Sequence, Eastern
<br /> Diablo Range and Northern San Joaquin Valley, Central California," USGS Open File
<br /> Report 90-226.
<br /> Boyajian and Ross Inc., 1998, "Work Plan for Initial Subsurface Investigation for Petroleum
<br /> Hydrocarbons, Site No. 1 (Site Code 1282)," June 30, 1998.
<br /> Central Valley Regional Water Quality Control Board, 1991, "Appendix A To Tri-Regional
<br /> Recommendations -- Reporting," August 30, 1991.
<br /> EMCON, 1998, "Fourth Quarter 1997 Groundwater Monitoring Report, Port of Stockton,"
<br /> report prepared for Stockton Terminals Technical Committee, March 27, 1998. a
<br /> North Coast, San Francisco Bay, and Central Valley Regional Water Quality Control Boards,
<br /> 1990, "Tri-Regional Board Staff Recommendations for Preliminary Investigation and
<br /> Evaluation of Underground Tank Sites," August 10, 1990.
<br /> Office of Environmental Health Hazard Assessment, 1998, "Public Health Goal for Methyl
<br /> Tertiary Butyl Ether (MTBE) in Drinking Water" (Draft), April 1998.
<br /> Sierra-Pacific Groundwater Consultants, Inc., 1994, "Results of Soil Investigation at 2130
<br /> West Washington Street Facility, Stockton, California," report prepared for Unocal
<br /> Corporation, Figure 11 Cross Section Between Borings P-38 and P-46, May 11, 1994.
<br /> , 1998, "First Semi-Annual 1998 Monitoring Report and Request for Regulatory
<br /> Closure, Former PureGro Molasses Feed Product Facility, 2130 West Washington
<br /> Street, Stockton," April 17, 1998.
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