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San Joaquin County DIRECTOR Donna Heran,REHS Environmental Health Department ASSISTANT DIRECTOR 600 East Main Street Laurie Cotulla,REHS c m Stockton, California 95202-3029 PROGRAM COORDINATORS �� < Carl Borgman,REHS Mike Huggins,REHS,RDI c AP Website: www.sjgov.org/ehd Margaret Lagorio,REHS i 6 Phone: (209)468-3420 Robert McClellon,REHS Fax: (209)464-0138 .teff Carruesco, REHS, RDI Kasey Foley, REHS January 13,2009 Mr. Robert Kupka Lodi Airport Corporation Post Office Box 10 Acampo, California 95220 Subject: Golden Eagle Aviation 23987 North Highway 99 Acampo, California 95220 The San Joaquin County Environmental Health Department (EHD) has reviewed Soil Vapor Survey Work Plan Addendum, dated November 24, 2008, prepared and submitted by Advanced GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. In the addendum, AGE proposes to advance four additional soil borings to total depth of approximately twenty feet below surface grade (bsg); advance the previously-approved soil vapor borings using a hand auger instead of direct push Geoprobe technology or a hand-held gas vapor probe; and install dedicated temporary vapor points at previously-approved soil vapor boring locations instead of Geoprobe soil vapor assemblies or hand-held gas vapor probes. AGE proposes to advance the four additional borings using Geoprobe direct push technology at locations illustrated in Figure 3 of the addendum. The four locations are approximately where significant concentrations of petroleum hydrocarbon contaminants had been detected in soil borings SB-1, SB-2, 3E@15, and lE@13 in 1999. AGE proposes to collect soil samples at five- foot intervals for analysis of total petroleum hydrocarbons quantified as aviation fuel (TPH-ag); benzene, toluene, ethyl benzene, and total xylenes (BTEX); and methyl tertiary-butyl ether (MTBE). AGE also proposes to document soil lithology and field-screen soil samples for volatile organic compounds using a photo-ionization detector. The EHD approves the advancement of the four additional borings as proposed by AGE. This is in addition to the two shallow soil borings advanced to approximately five feet bsg previously approved by the EHD by letter dated July 23,2007. AGE proposes to advance eight soil vapor borings to approximately five feet bsg using a hand auger and collect soil gas samples at approximately four-and-a-half to five feet bsg using temporary soil vapor points. The EHD approves the use of temporary soil vapor points with the following conditions. Upon installing the temporary soil vapor points, the system is to be allowed to equilibrate for at least forty-eight hours prior to collecting soil gas samples. A leak test usingan appropriate leak-detector compound such as 1,1-difluoroethane is to be performed at all potential ambient air intrusion locations. The leak-detector compound must be added to the list of analytes reported for soil gas samples. Following soil-gas-sample collection, remove casings, soil vapor points, sand and bentonite, then hand auger the borings to total depth and backfill the boreholes with portland cement from total depth to surface.