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<br /> Based on the low concentrations of PHCs in groundwater at this site, and the fact that no dunking
<br /> water supply wells are located near the site, there appears to be no risk to human health and safety
<br /> as a result of the residual contaminants beneath the site The site is surrounded on all sides by an
<br />' industrial complex The nearest surface water body is the Stockton Deep Water Channel, which is
<br /> approximately 2,000 feet north of the site The distance to the Deep Water Channel, the low
<br /> concentrations of PHCs beneath the site, and the location of the site within an extensive industrial
<br />' complex, would indicate that there is also no nsk to the environment from these contaminants
<br /> Because of the low potential nsk to human health and safety and the environment, and because the
<br /> concentrations of PHCs appear to be limited in depth and attenuating with time,it is recommended
<br />' that this site be monitored for several quarters to confirm that natural attenuation is taking place and
<br /> to establish the groundwater gradient at the site
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<br /> 6.0 REFERENCES
<br />' Bartow, J Alan and T H Nilsen, 1990, "Review of the Great Valley Sequence, Eastern Diablo
<br /> Range and Northern San Joaquin Valley, Central California," USGS Open File Report 90-
<br /> 226
<br /> Boyajian & Ross, Inc , 1998a, "Work Plan for Initial Subsurface Investigation for Petroleum
<br /> Hydrocarbons, Site Nos 2 and 3 (Site Code 1282-124)," report prepared for Port of
<br /> Stockton, June 30, 1998
<br /> 1998b, "Initial Subsurface Investigation for Petroleum Hydrocarbons, Site
<br />' Nos 2 and 3 (Site Code 1282-124)," report prepared for Port of Stockton, October 21,
<br /> 1998
<br />' EMCON, 1998,"Fourth Quarter 1997 Groundwater Monitoring Report,Port of Stockton,"report
<br /> prepared for Stockton Terminals Technical Committee, March 27, 1998
<br />' North Coast,San Francisco Bay,and Central Valley Regional Water Quality Control Boards, 1990,
<br /> "Tri-Regional Board Staff Recommendations for Prelirrunary Investigation and Evaluation
<br /> of Underground Tank Sites," August 10, 1990
<br /> Sierra-Pacific Groundwater Consultants, Inc , 1994, "Results of Soil Investigation at 2130 West
<br />' Washington Street Facility, Stockton, California,"report prepared for Unocal Corporation,
<br /> Fi re 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 Closure,
<br /> Fortner PureGro Molasses Feed Product Facility,2130 West Washington Street,Stockton,"
<br /> April 17, 1998
<br /> t9 PHILIP P. ROSS, R.G.
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