SITE INFORMATION AND CORRESPONDENCE_FILE 2

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STRATUS cMV RONMEi 1tA1, IPS", 3330 Cameron Park Drive Suite 550 Cameron Park CA 95682 Phone: (530) 676-6004 � Fax (530) 676-6005 PUBLIC NOTICE FOR IMPLEMENTATION OF CORRECTIVE ACTION Former Barnes Trucking Facility, 1817 South Fresno Avenue, Stockton, California Background Motor vehicle fuels were released to the subsurface at the subject property from a historical underground storage tank (UST) fuel storage system and San Joaquin County Environmental Health Department (SJCEHD) currently regulates an environmental case at the property relating to this condition. Beginning in the 1990's, work has been completed to assess and monitor contaminant levels in the subsurface. This work has indicated that petroleum hydrocarbons impact shallow soil and groundwater; groundwater levels beneath the property are currently at approximately 10 feet below surface grade. A plume of impacted groundwater extends east- southeastward across the Fresno Avenue right-of-way at relatively low concentrations not thought to pose a significant health hazard. Since the initial site investigations, several cleanup efforts have been completed at the subject property, however contaminant levels in onsite groundwater remain above levels that will allow SJCEHD to close this environmental case. Although human health and water wells are not known to be threatened from the fuel release, SJCEHD has directed that additional site cleanup work be performed. In response to this request, Stratus Environmental, Inc. (Stratus), working on behalf of the former Barnes Trucking facility, developed a plan to remediate the property to a condition that will allow for closure of the site under the criteria of the State Water Resources Control Board' s `Low Threat Closure Policy' for underground fuel release environmental cases. Proposed Corrective Actions Stratus has developed a cleanup plan that consists of injecting ozone, a strong oxidant, into the shallow groundwater interval through a network of injection wells. Application of ozone results in a chemical reaction that can degrade petroleum hydrocarbons to carbon dioxide and water. Ozone will be injected within the area of the site with the highest remaining concentrations of petroleum hydrocarbons in groundwater. Groundwater samples will be collected from monitoring wells located near the injection area to evaluate remedial performance. The project will initially be implemented for a period of four months (pilot scale); if the technology appears effective and further remediation is warranted, the remediation period will be extended. Reports will be submitted to SJCEHD at a minimum of once per quarter in order to provide the agency with information to enable timely oversight of the Cleanup. Further Information and Public Comment Opportunity Between March 16 and April 16, 2015, SJCEHD will be accepting public comments regarding the proposed Corrective Action. Comments should be submitted in writing to Mr. Gabriel Gonzalez, 1868 East Hazelton Avenue, Stockton, California 95205. Mr. Gonzalez may also be reached at gagonzalez@sjcehd.com or (209) 468-3442.For further information regarding the environmental case at 1817 South Fresno Avenue, please reference the State of California's GeoTracker Website (geotracker.waterboards.ca.gov), site T0607700585. For further information regarding the State Water Resources Control Board's `Low Threat Closure Policy', we suggest entering the words `Low Threat Closure Policy' into an interact search engine; this should provide a link to a PDF version of this document within a State of California website (waterboard s.c a.gov).