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v1117 Lone Palm Avenue, Suite B Tr Q - - Modesto, CA 95351 I www atc-enviro corn 209 579 2221 Fax 209 579 2225 �* A $ $ O C 1 A T E 3 I N C February 7, 2003 54 62514 0001 'N" 1VJ FE,D FEB 14 2003 Mr Mike Infurna ENVIRU'04! 'IC'°i HEALTH San Joaquin County Public Health PERM IVSERVICES Services, Environmental Health Division 304 E Weber Street, Third Floor Stockton, CA 95202 Subject Site Status Report King Island Resort, 11530 West Eight Mile Road, Stockton, California Dear Mr Infurna ATC Associates Inc has prepared this report, on behalf of Westrec Properties, to summarize the current status of the above referenced site (Figure 1) and to clarify the timing and sources of the unauthorized subsurface fuel releases at the site It has come to ATC's attention that there is a need to identify the , timing and location of the subsurface fuel releases In this status report, a summary of the site ibackground is provided to constrain the timing of the releases and the portion of the fuel system from which the releases occurred A discussion of the site geology and the impacts of the geologic properties on petroleum hydrocarbon transport in groundwater is also provided BACKGROUND Subsurface Investigations In March 1989, hydrocarbon impacted soil was detected to the cast of the restaurant building during a geotechnical investigation by Kleinfelder, Inc In April 1989, two shallow borings were advanced and soil samples were collected from depths of 3 to 5 feet below ground surface (bgs), and grab groundwater samples were also collected from the borings Elevated concentrations of total petroleum hydrocarbons and benzene were detected in soil and groundwater In March 1990, soil vapor samples were collected from 29 locations at approximate depths of 18 to 22 inches bgs Low levels of volatile organic compounds were detected in the soil vapor on-site during the survey In October 1990, RESNA Industries Inc (RESNA) hand augured 19 shallow soil borings to help determine the extent of petroleum hydrocarbons in soil in the vicinity of a product line leak Soil samples were collected at approximately 4 feet bgs and screened for possible volatile organic vapors using a photoionization detector(PID) PID readings ranged from 0 to 1,032 parts per million (ppm) In March and April 1991, RESNA supervised the drilling of five borings to be completed as groundwater monitoring wells MW-I through MW-5 (Figure 2) Petroleum hydrocarbon constituents were only • detected in the soil sample collected from 2 5 feet bgs in boring MW-2 Analytical results of groundwater samples indicated that wells MW-3, MW-4, and MW-5 contained detectable concentrations ENVIRONMENTAL, GEOTECHNICAL AND MATERIALS PROFESSIONALS