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i <br /> San <br /> n County <br /> 6EnAronmental Health Department <br /> 9c " <br /> le <br /> 1868 East Hazelton Avenue <br /> PROGRAMCOORDINATORS` <br /> Stockton, California2 Robert McClellon,REHS <br /> ,def Carruesco,F Hr RDI <br /> Iase Foley,rH <br /> Website: r sr f Linda Turkaytte,REHS <br /> Phoma. (209)468-3420 Rodney Estrada,REHS <br /> Fax: (209)464-0138 Adrienne Eftaesser,REHS <br /> March 3 , 2014 <br /> Chevron products Company Sp nos Jet Center <br /> Darryl Tessler Marc W. Hardy <br /> 145 S. State College 1010 I Trinity l rk v y, 5t� Floor <br /> Bred, CA 92321 Stockton, CA 95219 <br /> United States Dept of the Army Son Joaquin County <br /> Corp of Engineers Stockton Metropolitan Airport <br /> Gerald Vincent Patrick Crreno <br /> (C ESPKPM- ) 5000 S. Airport Way, <br /> 325 J Street Room 20 <br /> Sacramento, CSA 95814 Stockton, CSA 9520 <br /> .Subject: Stockton Metropolitan Airport <br /> Former Fuel Station <br /> 5000 South rpo Boulevard <br /> Stockton, 95206 <br /> The Sari Joaquin County Environmental health Department rtment E'l l hos reviewed Human <br /> Health lth Risk Assessment l~tHand Request for Closure Report (Report) doted June 5, <br /> 2012, submitted on your behalf by Rarnage Environmental, Inc., ( n ge). In the Report, <br /> rt, <br /> Damage presented the HHRA for the petroleum hydrocarbons originating from the forme <br /> USTs at the site and;requested the site be considered for loss-risk closure. The EHD E1had <br /> reviewed the report and responded by letter, dated October 30, 2012 with recommendations. <br /> Ramage submitted Groundwater naw to Monitoring Report Second Half 2013 (GWR), dated <br /> December 30, 2013, that addressed some of the EHD recommendations. <br /> By email dated March 4, 2014, l arnage requested the EHD to specify the information needed <br /> to complete the case closure evaluation for this site. In the email, Ramage indicated that the <br /> HHRA evaluated the risk associated with on-site ingestion and dermal contact with surface <br /> soil, on-site inhalation of outdoor air, and off-site ingestion and dermal contact with <br /> groundwater. The evaluation was based only on post-2002 sail samples, excluding all older <br /> data as not representative due to contaminant degradation, thereby effectively considering the <br /> data "non- detectable", In addition, the HH A. included contaminant concentration, but not an <br /> estimate of time required data to reach Water Quality Objectives WCC ). The following <br /> actions should be taken to resolve some of the identified issues and to move the site toward <br /> closure: <br /> The HHRA should be reevaluated using all sail data, including pre-20012 data to determine <br /> a conservative, Corse-case scenario to part an upper limit on the risk. A reasonable <br /> degradation rote may be utilized to `correct"data for use in the HH A, <br />