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• � RE G-E � <br /> FEB 2 4 2021 <br /> 1.0 INTRODUCTION ENVIRONMENTAL HEALTH <br /> PERMITISERVICES <br /> At the request of Mr.Robert Kupka, Stephen G.Muir Consulting Geologist&Geophysicist <br /> (Muir)has prepared this workplan for abandonment of groundwater monitoring and shallow soil <br /> gas wells associated with the Golden Eagle Aviation site,also known as the Lodi Airport site <br /> (herein referred to as"the site"). The site is located at 23987 State Route 99 West Frontage <br /> Road, Acampo,California and is within an unincorporated portion of northern San Joaquin <br /> County (Figure 1). <br /> 1.1 Project History <br /> The site is further identified as San Joaquin County Assessors Parcel Number(APN) 005-170- <br /> 25. Figure 2 depicts the site location relative to the regional groundwater basins in northern <br /> California. Figure 3 is a regional location map within the Acampo, California area. Figure 4 is <br /> a U.S. Geological Survey topographic map, scale 1:24,000. Figure 5 is an aerial photograph <br /> image obtained from Google Earth(2018)and depicts the east end of the Lodi Airport. <br /> An underground storage tank(UST) fueling system was in use at the site to fuel aircraft with <br /> aviation gas prior to June 1999. Figure 6 depicts the layout of the former UST system. Fuel <br /> used in the system reportedly consisted of 100 octane low-lead and 80/87 octane aviation fuel. <br /> The UST system consisted of three USTs(one 5000-gallon and two 4,000-gallon tanks), <br /> approximately 125 feet of product line piping and two dispensers(Figure 6). <br /> Prior to removal of the system in 1999,Advanced GeoEnvironmental, Inc. (AGE)collected <br /> shallow soil samples from beneath the product piping and deeper soil samples beneath the USTs <br /> utilizing angle borings. Figure 6 shows the former UST system layout and initial soil sampling <br /> locations. Figure 7 is a map of all soil borings, soil gas and groundwater monitoring wells. <br /> The product piping and dispensers were removed during June 1999 and the USTs were removed <br /> during July 1999. Additional soil samples were collected from the tank pits and from beneath <br /> the former dispenser locations(Figure 6). Total Petroleum Hydrocarbons quantified as gasoline <br /> (TPH-g)were detected in soil samples collected beneath the USTs and piping at concentrations <br /> as high as 6,400 milligrams per kilogram (mg/kg)and benzene,toluene, ethylbenzene,and total <br /> xylenes(BTEX)at concentrations as high as 4,360 micrograms per kilogram(µg/kg). Methyl <br /> tert-butyl ether(MTBE)was detected at concentrations as high as 27 µg/kg,and lead was locally <br /> detected at concentrations as high as 324 mg/kg. <br /> These soil sample analytical laboratory results demonstrated the high likely hood that an <br /> unauthorized release (UAR) of fuel hydrocarbons had occurred through use of the UST system. <br /> Based on these results,a Leaking Underground Storage Tank(LUST)case was opened by the <br /> San Joaquin County Environmental Health Department(SJCEHD) in 1999 to initiate corrective <br /> actions in response to the UAR. <br /> Lodi Airport Well Destruction Work Plan\10272020.wpd 1 <br />