SITE INFORMATION AND CORRESPONDENCE FILE 1

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San Joaquin County P Environmental Health Department DIRECTOR 'r 1868 East Hazelton Avenue Donna Heran,REHS 0: ` X Stockton, California 95205-6232 PROGRAM COORDINATORS Robert McClellon,REHS Jeff Carruesco, REHS, RDI Kasey Foley,REHS 4'Ciiz �� Website: www.sjgov.org/ehd Linda Turkatte, REHS Phone: (209) 468-3420 Rodney Estrada, REHS Fax: (209) 464-0138 Adrienne Ellsaesser, REHS September 20, 2013 Mr. Steve Azevedo West Clay Properties/Knife River Corporation Post Office Box 6099 Stockton, California 95206 Subject: West Clay Properties 639 West Clay Street Stockton, California 95206 Dear Mr. Azevedo: The San Joaquin County Environmental Health Department (EHD) has received and reviewed Final Remediation Plan (work plan), dated 13 August 2013, prepared and submitted by your consulting firm, Advanced GeoEnvironmental, Inc. (AGE), on your behalf for the above- referenced site. The EHD had directed the submittal of a work plan to install an ozone sparging system to remediate the petroleum hydrocarbon contamination in the 'Underground Storage Tank No. 3 area (the southeast petroleum hydrocarbon contaminant plume) by letter dated 30 May 2013. In the work plan, AGE proposes: • Installation of twelve one-inch diameter ozone sparge wells (OS-5 through OS-16), equipped with 48-inch micro-porous sparge points at depths between approximately 40 and 44 feet below surface grade (bsg), using eight-inch diameter hollow stem augers at locations illustrated on Figure 2 of the work plan; • Submittal of a draft Notice of Intent for the injection permit to comply with the terms of General Waste Discharge Requirements (WDR) Order No. R5-2008-0149, and a draft Monitoring and Reporting Program to the California Regional Water Quality Control Board Central Valley Region for their review and comment; • Collection of soil samples at five-foot intervals during the well installations, beginning at 35 feet bsg, for lithologic evaluation; and based on field screening using an organic vapor meter with a photo-ionization detector, selection of certain soil samples for analysis of total petroleum hydrocarbons as gasoline (TPH-g); benzene, toluene, ethylbenzene and total xylenes (BTEX); methyl tertiary-butyl ether (MTBE), ethyl tertiary- butyl ether (ETBE), tertiary-amyl methyl ether (TAME), di-isopropyl ether (DIPE), tertiary butyl alcohol (TBA), 1,2-dibromoethane (EDB), 1,2-dichloroethane (1,2-DCA) and lead. • Generation of approximately 2 to 3 pounds of gaseous ozone daily for injection at approximately 5 to 20 pounds per square inch of pressure during each injection period lasting 30 to 60 minutes at each proposed ozone injection well following the installation of the ozone sparge system;