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San Joaquin County <br /> aEnvironmental Health Department DIRECTOR <br /> � ' — .L Donna Heran, REHS <br /> 2 2 600 East Main Street <br /> Stockton , California 95202-3029 PROGRAM COORDINATORS <br /> LL1� Robert McClellon, REFS <br /> Jeff Carruesco, REHS , RDI <br /> c . Kasey Foley, REHS <br /> Website: www.sjgov. org/ehd Linda Turkatte, REHS <br /> Phone: (209) 468-3420 <br /> Fax : (209) 464-0138 <br /> March 5 , 2012 <br /> Remo Canepa <br /> Canepa's Car Wash <br /> 1536 N . Hunter <br /> Stockton , CA 95204 <br /> Subject: Canepa's Car Wash <br /> 6230 Pacific Avenue <br /> Stockton , CA 95207 <br /> The San Joaquin County Environmental Health Department ( EHD ) has reviewed Probable <br /> Second Release Investigation Report (PSRIR) dated 15 August 2011 , prepared by Advanced <br /> GeoEnvironmental , Inc. (AGE ) . The EHD also reviewed prior reports issued on the subject and <br /> other site data to evaluate the AGE 's identification of a second unauthorized release (LIAR) on <br /> the site that post-dates installation of the current underground storage tank ( UST) system in late <br /> 1991 <br /> In PSRIR, AGE presented eight " lines of evidence" purported to support a second LIAR or new <br /> release from the current UST system . Briefly stated , the eight lines are as follows : <br /> • Records of the EHD , various UST system testing and maintenance contractors, and <br /> those maintained by site personnel document "system failures in significant areas of the <br /> UST system in 2001 thought 2002" ; <br /> • The concentration trends of benzene and methyl tert-butyl ether (MTBE) in monitoring <br /> well MW- 1 which "decreased after the pre- 1993 release and then significantly and <br /> suddenly increased (prior to ground water extraction) in 2003 , are indicative of a release <br /> in 2002'; <br /> • The "precedent of issuing a second release UAR/URR at another site based only on <br /> concentration trends . . . " ; <br /> • The effect of groundwater extraction (GWE) on benzene and MTBE concentration trends <br /> in wells MW- 1 and MW- 11 (in which MW- 11 'cleaned up' and MW-1 pulled in more <br /> intensely impacted groundwater from the overlying zone) which " clearly masked greater <br /> and more significant concentration spikes from the second release " ; <br /> • The presence of butane , pentane and isooctane ; which purportedly volatilized in the <br /> vadose zone but have been recalcitrant in the saturated zone , <br /> • Carbon stable isotope analysis (CSIA) , wherein carbon isotope ratios appear to show <br /> that there were two distinct sources for MTBE currently sampled at wells SV-4 and <br /> MW-31 <br /> UAR Request Response Letter 0312 <br />