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San Joaquin County <br /> p <br /> Environmental Health Department DIRECTOR <br /> 1868 East Hazelton Avenue Linda Turkatte,REHS <br /> Stockton, California 95205-6232 PROGRAM COORDINATORS <br /> Robert McClellon,REHS <br /> Jeff Carruesco, REHS, RDI <br /> cq'.• ��c Website: www.sigov.org/ehd Kasey Foley,REHS <br /> F°R - Rodney Estrada, REHS <br /> Phone: 209 <br /> ( ) 4683420 Adrienne Ellsaesser,REHS <br /> Fax: (209) 464-0138 <br /> June 1, 2015 <br /> Raymond Greer Albert &Wanda Veldstra <br /> Raymond Greer Construction 15634 Steinegul Road <br /> 1601 Cabrillo Court Escalon, CA 95320 <br /> Modesto, CA 95355 <br /> Subject: Former Greer Construction — Reports <br /> 15634 Steinegul Road <br /> Escalon, CA 95320 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed Feasibility <br /> Study Addendum (FSA) dated May 20, 2011 and First Quarterly Monitoring Report 2013 <br /> (1 Q2013), dated September 20, 2013, prepared and submitted by Cardno ATC, Inc. (Cardno). <br /> From September 6, 2005 through September 25, 2008, soil vapor extraction (SVE) remediation <br /> was performed at the subject site (Site), targeting the vadose zone. After rebound testing <br /> showed that further SVE operation would not significantly affect subsurface conditions at the <br /> Site, by letter dated January 26, 2010, the EHD concurred with Cardno's recommendation to <br /> permanently discontinue SVE activities and remove all associated equipment. Since that time, <br /> the SVE equipment has been removed from the Site, however, the vapor extraction wells <br /> remain. <br /> FSA was submitted to address comments in the EHD letter of June 25, 2010, regarding the <br /> reported results from a bench scale test conducted to evaluate potential use of ozone infusion to <br /> remediate the remaining contamination in the groundwater at the Site. In FSA, Cardno <br /> evaluated in detail four groundwater remedial alternatives: pump and treat, air sparging, ozone <br /> infusion and natural attenuation. In FSA, Cardno estimated that 6 pounds of petroleum <br /> hydrocarbons remain in the groundwater. Cardno recommended use of natural attenuation and <br /> relocating the onsite domestic well further from the plume to be the most cost effective remedy <br /> for this Site. <br /> Through email correspondence between the EHD and Underground Storage Tank Cleanup <br /> Fund (Fund) staff in January 2012, the Fund expressed an opinion that installation of a new <br /> domestic well may create a new conduit for contaminant movement and did not express support <br /> for relocating either the onsite domestic well or the neighboring property's domestic well. Since <br /> that time, semi-annual groundwater monitoring events have continued to be performed at the <br /> Site; the most recent on May 21, 2015, <br /> In 1 Q2013, Cardno recommended that the Site be evaluated for closure as a low-risk site based <br /> on the results of the January 2013 groundwater monitoring event. The EHD determined the <br /> case was not eligible for closure as several impediments were identified during evaluation of the <br /> Site in accordance with California's Low-Threat Underground Storage Tank Case Closure Policy <br /> (Policy). <br />