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San Joaquin County DIRECTOR <br /> Ronna Heran,REHS <br /> Environmental Health Department� ASSISTANT DIRECTOR <br /> 600 East Main Street !auris cotuiia.RENS <br /> Stockton, California 95202-3029 PROGRAM COORDINATORS <br /> Cart Borgman,REHS <br /> Mitre Huggins,REHS,Rol <br /> �q �;ti Websi#er www.Sfgov.orgtehd Margaret Lagorio.REHS <br /> r F o R Phone: (209)468-3420 Robert McCtellon,,REHS <br /> Fbx' (209)464-0138 .teff Carruesco,REHS,Rat <br /> Kasey Foley,REHS <br /> January 8, 2009 <br /> Joe Toste Jr. <br /> JT Storage <br /> 2484 Toste road <br /> Tracy CA 95376 <br /> Subject: Curtiss Pontiac-Cadillac SITE CODE: 1,477 <br /> 2450 Taste Road <br /> Tracy CA 95376 <br /> San Joaquin Paucity Environmental Health [department (SJC/EHD) has reviewed Ozone <br /> Injection Bench Scale Work Flan Addendum; (Addendum) dated November 21, 200$:;submitted <br /> on your behalf by Advanced GeoEnvironmental, Inc. (AGE) and has the following comments. <br /> In May 2003, remediation b-removal of 1300 tons of contaminated soil was performed at:this: <br /> site. Currently; the only groundwater contamina#ion remaining at the site;appears limited to the <br /> shallow groundwater in the area of monitoring well MW-1 B. <br /> In Feasibility Study R0pott dated February 7,2008 AGE compared tw.o alternatives taremediate <br /> the remaining groundwater caintarrtiinatian, ozone injection and groundwater extraetian. They <br /> concludeel that;ozone irtiiection would bee more cost effective alternative. AGE+estimated that <br /> the cost to implement ozone inject on would be up to $120;000.00, The EHID recommends that <br /> the feasibility and cost effectiveness of groundwater remediation by either air ;sparging or <br /> oxygen injection be evaluated. These alternatives would not require bene) scale testing.. <br /> Additionally, since directing: the bench.scale test for ozone injection at.this site, the EHI Etas <br /> become aware of another option. Given that groundwater remediation by .ozoneIr jecticir! is: <br /> =currently being performed at`:an adjacent site (2353 Toste Road, Tracy Marine Sales)and It.Was <br /> stated in the f=easibility Stuoy Report that the stratigraphy of the two sites is similar; data from <br /> groundwater sampling;at tha site may be used instead of performing an ozone.,h Ch scale:test. <br /> for:this site. Groundwater isamples can be collected from monitoring wells up-gradient of the <br /> ozone system, in the ozr�ne system area and down-gradient of the ozone: system and analyzed <br /> for dissolved metals. if the data from this sampling demonstrates that ozone iniection 41d. not <br /> cause groundwater degradation at 235`3 Toste Road, it can be used to justify that ozone <br /> injection:-hould riot cause groundwater degradation at this site. <br /> The Feasibility Sfudy Reporar:states that: the ozone system at 2353 Toste Road has .operated <br /> discontinuously. The. EHD is aware there have been problems with the operation ofozone. <br /> systems which is another reason to evaluate the alternatives of airs parg ng or oxygen injection.. <br />