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San Joaquin County <br /> Environmental Health Department DIRECTOR <br /> ' t 186 EastHazeltonJird lrsrestte r r <br /> Stockton, if California 5205-6232 l a 1�M 1RDIN T <br /> .. Robert WCWIon,REHS <br /> Jeff Carruesco,F OAS,REFI <br /> a Rodney Estrada,REHS <br /> Phone: 2 468-3420 Adder:ne Eftae ser,REHS <br /> Fax: (209)464«0138 <br /> April 16, 2915 <br /> Chevron-Products Company Sperms Jet Center <br /> Darryl Pessler Marc W. Hardy <br /> 145 S. State Gallego 10199 Trinity Parkway, 5t" Floor <br /> Brea, CA 92821 Stockton, CA 95219 <br /> United States Dept of the Array Sari Joaquin County <br /> Corp of Engineers Stockton Metropolitan irport <br /> Gerald Vincent Detrick Ct rreno <br /> CEKM-M 5990 S. Airport Way, <br /> 1325 J Street; Room 202 <br /> Sacramento, A 95314 Stockton, CA 95206 <br /> Subject: Closure Request Response <br /> Stockton Metropolitan Airport <br /> Former t t on <br /> 6000 South Airport Boulevard <br /> Stockton, 95206 <br /> The Sari Joaquin County Environmental l He lth Department rtment EH has reviewed Additional Case <br /> Closure, Evaluation and Groundwater M017itoring Report f=irst hialf 2014 (Deport) dated June 13, <br /> 2914, submitted on your behalf by Ramage Environmental, Inc,, (Ramage). In the Deport; <br /> Rarnage provided information needed to continue case closure consideration as directed by the <br /> EHD by letter dated 31 March 2014, Information required by the EHD included: <br /> reevaluation of the human health risk assessment HHR utilizing pre-2992 snail data, <br /> with an allowance made for natural attenuation on concentrations, <br /> • An estimate of the time required for impacted groundwater to achieve the gator quality <br /> objectives (\IVs) established by the Central Valley Regional Aster Quality Control <br /> Board y R QC and <br /> corrected Table 1, Lit of Former T's in Groundwater Monitoring Report Second <br /> Haff 2013(GWR), dated December 39, 2013, <br /> The revised HHRA concluded that the risk to human health from the chemicals of concern was <br /> stip at acceptable levels for case closure consideration, Ramage estimated that dissolved total <br /> petroleum quantified as gasoline s RH9) concentrations would achieve WQOs in the year 20120 <br /> and dissolved benzene in 2016. Table 1 was properly corrected.: The EI D finds all the information <br /> submitted in the Report to be favorable for case closure consideration. <br /> In this review of the site data, the EHD finds that the 31 March 2914 letter should also have <br /> contained a directive to sample the two inactive gator supply wells for the chemicals of concern <br />