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1 <br /> 1.0 INTRODUCTION <br /> 1 <br /> This report presents the findings of a subsurface investigation conducted by SECOR International Incorporated <br /> (SECOR) at a recreational marina property located at 11530 West Eight Mile Road in Stockton, California <br /> ("the site") This investigation was performed on behalf of Westrec King Island, Inc and King Island, L L C <br /> (Westrec) in accordance with SECOR's proposal to Westrec dated November 10, 1995 <br /> 1.1 SITE LOCATION AND DESCRIPTION <br /> The site is located on the west side of King Island, on Honker Cut and Disappointment Slough in Stockton, <br /> California (See Figure 1) Land use in the site vicinity is predominantly agricultural The site is currently <br /> occupied by a recreational marina and boat repair facility The site is currently divided into two separate <br /> parcels, King Island Resort(King Island) and Holiday Harbor (see Figure 2) <br /> 12 SITE BACKGROUND <br /> Several investigations have been performed on the site including ENSR Consulting and Engineering (ENSR) <br /> Phase I Environmental Site Assessment(1988), Thorne Environmental Inc Transmittal of Site Information <br /> (1989), Falcon Energy Associates Emergency Response Report(1989), RESNA (a k a Waterwork, a k a <br /> Smith Environmental Technologies Corporation) Preliminary Investigation(1990), Problem Assessment Report <br /> (1991), Soil Sampling/UST Removal Report(1991), Quarterly Groundwater Monitoring Reports (1991-1995), <br /> and, SECOR's Phase I Environmental Site Assessment Report(March 1996) With the exception of the SECOR <br /> assessment, the investigations were conducted only on the King Island portion of the site <br />' The Phase I Environmental Site Assessment conducted by ENSR in 1988 covered only the King Island portion <br /> of the site According to information in this report, three underground storage tanks (USTs) and two septic <br /> tanks existed on the site at the time the report was submitted The report submitted by Thorne documented <br />' the results of grab soil and groundwater samples collected at the King Island property in 1989 Grab soil and <br /> groundwater samples were collected as part of a follow up to a geotechnical investigation that indicated the <br /> presence of petroleum hydrocarbons in the soil and groundwater during foundation test drilling Soil and grab <br /> groundwater samples were collected from two boreholes and analyzed for total petroleum hydrocarbons (TPH) <br /> and benzene, toluene, ethylbenzene, and xylenes (BTEX) using EPA Methods 8015 and 8020 Analytical <br /> results revealed TPH levels as high as 1,900 milligrams per kilograms (mg/kg) and 140 milligrams per liter <br /> (mg/0 in soil and groundwater,respectively Benzene was detected in groundwater at concentrations as high as <br /> 2,700 micrograms per liter(µg/e) <br /> The Emergency Response Report prepared by Falcon in 1989 documented the clean up of a ruptured diesel line <br /> associated with one of the USTs on the King Island property Approximately 40 yards of peat was excavated <br /> and removed from between the marina store and office buildings under an emergency EPA I D number during <br /> cleanup Approximately 20 yards of sandy loam were utilized as backfill for the excavated area Samples were <br /> reportedly collected, but no results could be located <br /> According to the Falcon report,the 1989 "leaf, appeared to originate under a deck on top of the levee and flow <br /> back on the eastern backside of the levee to the road behind the King Island offices the fuel had gurgled down <br /> h%we tm6kLhh%jhh"rpt 1 <br />' SO133-M]-02 <br />