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ii t 1.0 INTRODUCTION I } This report presents the findings of a subsurface investigation conducted by SECOR International Incorporated ' (SECOR) at a recreational marina property located at 11530 West Eight Mile Road in Stockton, California ("the site"). This investigation was performed on behalf of Westrec King Island, Inc. and King Island, L.L.C. (Westrec) in accordance with SECOR's proposal to Westrec dated November 10, 1995. ' 1.1 SITE LOCATION AND DESCRIPTION i� ' The site is located on the west side of King Island, on Honker Cut and Disappointment Slough in Stockton, California (See Figure 1). Land use in the site vicinity is predominantly agricultural. The site is currently occupied by a recreational marina and boat repair facility. The site is currently divided into two separate parcels, King Island Resort(King Island) and Holiday Harbor (see Figure 2). ii 1.2 SITE BACKGROUND Several investigations have been performed on the site including: ENSR Consulting and Engineering(ENSR) Phase I Environmental Site Assessment (1988); Thorne Environmental Inc. Transmittal of Site Information ' (1989); Falcon Energy Associates Emergency Response Report",(1989); RESNA (a.k.a. Waterwork, a.k.a. Smith Environmental Technologies Corporation)Preliminary Investigation(1990); Problem Assessment Report (1991); Soil Sampling/UST Removal Report(1991); Quarterly Groundwater Monitoring Reports (1991-1995); and, SECOR's Phase I Environmental Site Assessment Report(March 1996). With the exception of the SECOR assessment, the investigations were conducted only on the King Island portion of the site. �I The Phase I Environmental Site Assessment conducted by ENSR in 1988 covered only the King Island portion ' of the site. According to information in this report, three underground storage tanks (USTs) and two septic i tanks existed on the site at the time the report was submitted. The report submitted by Thorne documented the results of grab soil and groundwater samples collected at the King Island property in 1989. Grab soil and ' groundwater samples were collected as part of a follow up to aEgeotechnicai investigation that indicated the presence of petroleum hydrocarbons in the soil and groundwater during foundation test drilling. Soil and grab groundwater samples were collected from two boreholes and analyzed for total petroleum hydrocarbons (TPH) ' and benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Methods 8015 and 8020. Analytical results revealed TPH levels as high as 1,900 milligrams per kilograms (mg/kg) and 140 milligrams per liter (mg/O in soil and groundwater,respectively. Benzene was detected in groundwater at concentrations as high as ' 2,700 micrograms per liter(gg/Q). The Emergency Response Report prepared by Falcon in 1989 documented the clean up of a ruptured diesel line associated with one of the USTs on the King Island property. Approximately 40 yards of peat was excavated and removed from between the marina store and office buildings under an emergency EPA I.D. number during clean up. Approximately 20 yards of sandy loam were utilized as backfill for the excavated area. Samples were ' reportedly collected,but no results could be located. E According to the Falcon report, the 1989 "leak appeared to originate under a deck on top of the Ievee and flow ' back on the eastern back=side of the levee to the road behind the King Island offices...the fuel had gurgled down E i�. ht�. t�Udhhkldhl;i rix 50133-061-02 1 F i�