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0 6 . San Joaquin County Environmental Health Department DIRECTOR ).•'_ ' .O Donna Heran,REHS 1868 East Hazelton Avenue PROGRAM COORDINATORS Stockton, California 95205-6232 Robert McClellon,REHS Jeff Carruesco,REHS,RDI • cq .. ,.: ' ° Website: www.sjgov.org/ehd Kasey Foley,REHS FORa Linda Turkatte,REHS Phone: (209)468-3420 Rodney Estrada,REHS Fax: (209)464-0138 Adrienne Ellsaesser,REHS May 28, 2013 Mr. Robert Kupka Lodi Airport Corporation Post Office Box 10 Acampo, California 95220 Subject: Lodi Airport 23987 North Highway 99 Acampo, California 95220 Dear Mr. Kupka: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Soil-Vapor Investigation Report — August 2012 (report), dated 04 January 2013, prepared and submitted by your consulting firm, Advanced GeoEnvironmental, Inc. (AGE) on your behalf for the above-referenced site. The report documents the installation of soil gas sampling points V100 through V102 on 07 January 2011, and sampling of the three soil gas points on 28 August 2012. High concentrations of total petroleum hydrocarbons quantified as aviation gasoline (TPH-ag) were detected in soil gas samples collected from V100 at 68,000 micrograms per liter (lag/L), V101 at 12,000 lag/L, and V102 at 2,600 lag/L. These concentrations are above the Environmental Screening Level (ESL) of 29 pg/L published by the San Francisco Bay Regional Water Quality Control Board. High concentrations of benzene were detected at 3.1 lag/L in soil gas samples collected from V100; this benzene concentration is well above the ESL of 0.28 pg/L and above the California Environmental Protection Agency's California Human Health Screening Levels (CHHSL) of 0.122 lag/L, published by the Office of Environmental Health Hazard Assessment. Toluene was also detected in soil gas sample V100 at 600 lag/L, above the ESL of 180 lag/L and the CHHSL of 378 lag/L. Ethylbenzene was detected at 5.9 lag/L in soil gas samples collected from V100, 5.0 lag/L from V101, and 4.7 lag/L from V102. These concentrations exceed the ESL of 3.3 lag/L. Using a version of the Johnson and Ettinger Model, AGE calculated the cancer risk at 1.3 X 10-8, above the industry standard acceptable cancer risk of 1.0 X 10-8. The EHD has also completed the Low-threat Closure Policy Checklist for this site and the following impediments to closure have been identified: • The nearest on-site domestic well is approximately ten feet from the northern-most of three former underground storage tanks and this site is not within the service area of a public water system;