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San Joaquin County DIRECTOR <br /> Donna Heran,REHS <br /> Environmental Health Department p ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla,REHS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Y Carl Borgman,REHS <br /> i•' Mike Huggins, REHS, RDI <br /> •.,.�,..��Q Website: www.sjgov.org/ehd Margaret Lagorio,REHS <br /> /FOR <br /> Phone: (209)468-3420 Robert McClellon, RENS <br /> Fax: (209) 464-0138 ,teff Carruesco,REHS,RDI <br /> Kasey Foley,REHS <br /> 20 July 2009 <br /> Frank Morita <br /> 6622 Belmont Place <br /> Stockton, CA 95207 <br /> Subject: Morita Brothers <br /> 814 E. Charter Way <br /> Stockton, CA <br /> San Joaquin County Environmental Health Department (EHD) has reviewed your site data and <br /> monitoring requirements, and has discussed possible closure consideration for your site with a <br /> representative of the Central Valley Regional Water Quality Control Board, and with your <br /> consultant, Geological Techniques, Inc. (GTI). <br /> By letter dated 06 February 2009, the EHD provided you the data interpretation for your site that <br /> the EHD developed during the data and site review; this data and interpretation has been <br /> discussed with the CVRWQCB, who concurred with the EHD interpretation that the total <br /> petroleum hydrocarbons quantified as gasoline (TPHg) detected and monitored in MW-108 and <br /> MW-208, is likely associated with the unauthorized release from the underground storage tank <br /> (UST) system on the 749 East Charter Way site; as such, the EHD will not require you to <br /> continue sampling of MW-108 and MW-208. <br /> Also discussed in the 06 February 2009 letter was the EHD interpretation that the methyl tert <br /> butyl ether (MTBE) detected in groundwater samples collected from MW-109 represented a low <br /> mass, low concentration migrating plume of dissolved MTBE that had displayed a similar <br /> concentration history in groundwater samples from monitoring well MW-106. The EHD has been <br /> looking for confirmation through one or two additional sampling events to validate the model. If <br /> the model is validated, the EHD desires to move your site toward closure consideration. <br /> Submit a site closure summary report to the EHD, addressing all items called for in the Tri <br /> Regional Guidelines, Appendix B. Also include estimates of the residual contaminant masses in <br /> soil and groundwater to be left in place. If the water quality objectives (WQOs) listed in the <br /> Basin Plan are exceeded, include an estimate of the time required for the contaminant <br /> concentrations to achieve WQOs. As the dissolved MTBE encountered in monitoring wells MW- <br /> 106 and MW-109 appears to be migrating, provide a fate and transport model for the MTBE. <br /> To comply with Resolution 2009-0042, recently adopted by the State Water Resources Control <br /> Board, the EHD is further reducing your monitoring requirements until site closure is granted as <br /> follows: <br /> Monitoring Reduction Letter 2009 <br />