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Five Star Marina - 3 - February 6, 2012 <br /> General Site Conditions <br /> • Geology and Hydrogeology: The Site is underlain by interbedded and intermixed sand, i <br /> silt and clay. The depth to groundwater is approximately 7 feet bgs and the groundwater <br /> gradient is north to northwest with a gradient of 0.002 to 0.004 ft/ft. The closest surface <br /> water is the Stockton Deep.Water Channel, located immediately adjacent to the site. <br /> • Estimate of Hydrocarbon Mass in Soil: Prior to remediation, AGE estimated that <br /> approximately-18,520 cubic yards of contaminated soil.remain with 773 pounds of TPHg <br /> in site soil and 0.49 pounds of TPHg dissolved in groundwater <br /> • Groundwater Trends: There are more than 13 years of groundwater monitoring data for <br /> this Site. Benzene trends are shown below, source area (MW-8) and down gradient <br /> (MW-5) <br /> BENZENE Results for MW8 ; <br /> 1 - 76 1... _ ... <br /> 50 <br /> 36.I- <br /> 2U -� <br /> •�° ;; x <br /> BENZENE T •nd� <br /> BENZENE Results for MW5 <br /> ❑el <br /> -_ I... <br /> iL�9ENZENE w Trend j <br /> Sensitive Receptor Survey <br /> A Sensitive Receptor Survey (SRS) was conducted in Advance Geo Environmental. A records <br /> search at the Department of Water Resources and an on-the-ground survey in the area did not <br /> identify any water supply wells within a 2,000 foot radius of the Site. The Stockton Deep Water <br /> Channel lies approximately 50 feet from the site. Drinking water at and near the Site is currently <br /> supplied by the Stockton Water District. <br /> Recommendation <br /> June 2008, the Fund concurs with the San Joaquin County LOP that the Responsible Party <br /> must define the vertical extent of contamination, further define the extent of groundwater <br /> contamination to the northwest, and to conduct batch extraction to reduce groundwater <br /> contamination. The Fund will review this site next year to track progress. <br /> UPDATED', June 2009, the Fund recommends that the San Joaquin County LOP review this <br /> site for closure. <br />