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Y <br /> San ,Joaquin County <br /> Environmental Health Department orRecrOR <br /> � <br /> Environmental <br /> GDonna Heran,REHS <br /> 600 East Main Street PROGRAM COORDINATORS <br /> a: a <br /> Stockton, California 95202-3029 Robert McClellon,REHS <br /> Jeff Carruesco, REHS,RDI <br /> Kasey Foley, REHS <br /> Website: www.sjgov.org/ehd Linda Turkatte,REHS <br /> Phone: (209) 468-3420 <br /> Fax: (209)464-0138 <br /> October 11, 2010 <br /> Thomas Altwies Tony Palma <br /> Manna Pro Products, LLC Palma Properties LLC <br /> 707 Sprit 40 Park Drive, Suite 150 10 Rickenbacker Circle <br /> Chesterfield, MO 63005 Livermore, CA 94551 <br /> Subject: Former Manna Pro <br /> 4004 S. Ei Dorado Street <br /> Stockton, CA 95206 <br /> The San Joaquin County Environmental Health Department (EHD) has received and reviewed <br /> Site Conceptual Model and Closure Report (SCM), dated 07 June 2010, and Remedial System <br /> Performance Report (RSPR), dated 18 December 2009, both prepared by your consultant Geo- <br /> Phase Environmental (GPE). in addition, the EHD has reviewed recent groundwater monitoring <br /> reports and other site data to evaluate your request for site closure. Based on data and <br /> discussions presented in the reports reviewed, GPE concluded: <br /> • The hydrocarbons released from the former underground storage tank (UST) system <br /> migrated approximately vertically down to impact the groundwater and soil of the <br /> saturated zone; <br /> • Excavation removed an estimated 1,600 pounds of fuel hydrocarbons from the vadose <br /> zone soil, leaving 22,000 pounds in the saturated zone, of which an estimated 15,000 <br /> pounds were removed by SVE; <br /> • Seven years of soil vapor extraction (SVE) and insitu air sparging (IAS) has removed <br /> approximately two-thirds of the sorbed contaminant mass and over 90% of the dissolved <br /> contaminant mass; <br /> • Essentially no vadose zone contamination remains in place; <br /> • The residual dissolved contaminant mass is approximately 41 pounds; <br /> • The contaminant plume (dissolved) is confined to the subject site property and is stable <br /> and reducing; <br /> • It will require approximately 37 years for dissolved TPHg concentrations to decline to <br /> 100 milligrams per liter (lag/L) and 43 years for dissolved benzene concentrations to <br /> decline to 1 pg/L; <br /> • There is minimal potential for direct contact or inhalation of impacted soil; <br /> • There are no nearby water supply wells except for a fire suppression well; <br /> • There are no enclosed structures currently in the impacted area subject to vapor <br /> intrusion; and <br /> Closure Request Response Letter 1010 <br />