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San JoaqWn �fAtmniry <br /> Ef1Vi1'onmoWM HaaK >1 Ugp)avi: ffllien : DIRECTOR <br /> �. —. <br /> _ � . 600 East Dain Street Donna Heran, REHS <br /> c. <br /> PROGRAM COORDINATORS <br /> FLdlll Stockton , California 95202-3029 Robert McClellan, REHS <br /> Jeff Carruesco, REHS, RDI <br /> • �' ' — • ' �Q Website: www.sjgov. org/ehd Kasey Foley, REHS <br /> qC i F O R� <br /> Phone : (209) 468-3420 Linda Turkatte, REHS <br /> Fax: (209) 464nM 33 <br /> May 18 , 2011 <br /> Remo Canepa <br /> Canepa's Car Wash <br /> 1536 N . Hunter <br /> Stockton, CA 95204 <br /> Subject: Canepas Car Wash <br /> 6230 Pacific Avenue <br /> Stockton, CA 95207 Site Code: 1225 <br /> The San Joaquin County Environmental Health Department ( EHD) has reviewed Soil-Vapor <br /> Intrusion Report (SVIR) dated 23 March 2010, prepared by Advanced GeoEnviron mental , Inc. <br /> (AGE). The EHD also reviewed Annual Ground Water Monitoring Report — Fourth Quarter 2009 <br /> (AGMR) , dated 05 July 2010 , and Ground Water Monitoring Report — Second Quarter 2010 <br /> (GWMR 'l0), dated 25 October 2010. <br /> SVIR contained a laboratory report prepared by Friedman & Bruya , Inc (F&B) dated 17 <br /> December 2009, in which the leak detection compound 2-propanol was the only chemical <br /> detected and identified in several samples; petroleum hydrocarbons were not detected in any of <br /> the soil gas samples collected on your site 01 December 2009 . A conclusion drawn by AGE was <br /> that the soil gas samples had been collected from native soil and AGE recommended additional <br /> soil gas sampling in areas underlain by pea gravel. <br /> AGMR and GWMR ' 10 document the groundwater monitoring events of 17 November 2009 and <br /> 04 May 2010, respectively, and the analytical results for the samples collected . Total petroleum <br /> hydrocarbons quantified as gasoline (TPHg) were detected in groundwater samples at <br /> concentrations as high as 300 ,000 micrograms per liter (Ng/L), methyl tert-butyl ether (MTBE) as <br /> high as 220,000 pg/L, and benzene at concentrations as high as 79, 000 pg/L. Other analytes <br /> were also detected at relatively high concentrations, such as toluene, ethylbenzene and the <br /> xylenes ; other analytes were detected at lesser, but still potentially significant concentrations. <br /> The only SV well sampled in May 2010 was SV-4 . In AGMR; F&B tentatively identified the <br /> presence of butanes and pentanes in several of the November 2009 groundwater samples at <br /> low concentrations (maximum 190 pg/L pentane estimated ) . In both reports your consultant <br /> recommended "further reducing ground water monitoring requirements to semi-annual on <br /> limited wells" and "issuance of an unauthorized release of petroleum due to the increased <br /> concentrations of dissolved petroleum hydrocarbons" in MWA . <br /> Regarding reducing the monitoring requirements to semi annual , as far as the EHD is aware, no <br /> wells are currently on a monitoring schedule more frequent than semi-annual . By letter dated <br /> 21 July 2009, the EHD had directed reduction of monitoring (meaning sampling ) of your <br /> monitoring wells to either a semi-annual , annual or biennial frequency, which was specified for <br /> each well . A further reduction of monitoring frequency requires a specific monitoring proposal <br /> LIAR Request Response and Directive Letter 0511 <br />