SITE INFORMATION AND CORRESPONDENCE

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San Joaquin County Environmental Health P4 Department DIRECTOR N r�O. Donna Heran, RENS 2 � 1868 East Hazelton Avenue a: %'i` �� •'t :< Stockton, California 95205-6232 PROGRAM COORDINATORSRobert McClellon,REHS •• ,_. .�;• Jeff Carruesco, REHS,RDI 0... P Website: www.sjgov.org/ehd Kasey Foley,REHS Linda Turkatte, REHS Phone: (209) 468-3420 Rodney Estrada, REHS Fax: (209)464-0138 Adrienne Ellsaesser,REHS June 6, 2014 Mr. Robert Kupka Py Lodi Airport Corporation Post Office Box 10 Acampo, California 95220 Subject: Lodi Airport 23987 North Highway 99 Acampo, California 95220 Dear Mr. Kupka: By letter dated 28 May 2013, the San Joaquin County Environmental Health Department (EHD) notified you that this site is not ready for closure consideration having identified impediments to closure based on the Low-threat Closure Policy Checklist (LTCP) criteria adopted in August 2013 by the State of California Water Resources Control Board. The EHD directed that the risk to human heath posed by the site specific conditions be adequately addressed and that a response be submitted to the EHD by 09 August 2013. The impediments to closure included: • The nearest on-site domestic well is approximately ten feet from the northern-most of the three former underground storage tank locations and this site is not within the service area of a public water system; • The nearest on-site domestic well is approximately forty-five feet from the soil most intensely impacted by petroleum hydrocarbon contamination; • Total petroleum hydrocarbons as aviation gasoline (TPH-ag) were detected at 6,400 milligrams per kilogram (mg/kg) at approximately three feet below surface grade (bsg) in soil sample P-4 on 18 June 1999 and remedial efforts have not been implemented; and • High concentrations of TPH-ag, benzene, toluene, and ethylbenzene were detected in soil gas samples collected from soil vapor samples V100 through V102 in August 2012; this followed the collection of soil gas samples in March 2009 in which TPH-ag was detected at 1,960,000 micrograms per cubic meter (Ng/m3), 73,500 pg/m3, and 138,000 Ng/m3 in soil gas samples V6, V7 and V8, respectively (well above the ESL of 29,000 Ng/m)• It has been over a year and the EHD has not received either a technical demonstration that the above-listed items are not a potential threat to human health, groundwater, or the environment, or a proposal for addressing them. You are now directed to respond to this department within thirty days of the date of this letter regarding these issues.