Laserfiche WebLink
San Joaquin County DIRECTOR <br /> Pq U I N Donna Heran, REHS <br /> ,o. Environmental Health Department ASSISTANT DIRECTOR <br /> 600 East Main Street Laurie Cotulla, REHS <br /> co <br /> { Stockton , California 95202-3029 <br /> PROGRAM COORDINATORS <br /> Mike Huggins, REHS, RDI <br /> cq ' Website: wwws; Ovor /ehd Margaret Clelloo, REHS <br /> � i F o'R 19 g Robert McClellon, REHS <br /> Phone: (209) 468-3420 ,teff Carruesco, REHS, RDI <br /> Fax: (209) 464-0138 Kasey Foley, REHS <br /> April 17, 2009 <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 Site Code: 1225 <br /> The San Joaquin County Environmental Health Department (EHD) has reviewed <br /> Evaluation of Analytical Data (the EAD ) dated 31 December 2008 , prepared by <br /> Advanced GeoEnvironmental, Inc. (AGE), the EAD contained an untitled letter prepared <br /> by Friedman & Bruya , Inc. (F&B) dated 11 December 2008 , finding that a release from <br /> the new underground storage tank (UST) system has occurred since the initial release <br /> discovered in 1993. F&B reached this conclusion due to the presence of butanes and <br /> pentanes indicated in the GCMS data for various groundwater samples analyzed by <br /> another laboratory. <br /> F& B had reached a similar conclusion for a site in the Lahontan Region , citing the <br /> presence of butanes and pentanes in groundwater samples that had decreasing <br /> concentrations of methyl tert-butyl ether (MTBE) and increasing concentrations of <br /> benzene, toluene, ethylbenzene and total xylenes (BTEX). F&B noted that n—butane has <br /> a high vapor pressure and is a gas at standard temperatures and pressures, and as a <br /> result is one of the first compounds lost when using a soil vapor extraction (SVE) <br /> system . In their letter of 11 December 2008, F&B noted that MTBE concentrations on <br /> the subject site did not follow the usual trend , but have increased since the mid 1990s in <br /> some wells, and cited that increase as also indicating a post- 1993 release date for the <br /> contaminants. <br /> Based on the F&B finding , AGE recommended that the Central Valley Regional Water <br /> Quality Control Board (CVRWQCB) direct the EHD to issue a new unauthorized release <br /> (UAR) declaration for the site. As the CVRWQCB has a chemist on staff qualified to <br /> evaluate the data , the EHD requested assistance from the CVRWQCB in evaluating the <br /> chemical analysis and conclusions of F& B. AGE provided the CVRWQCB with copies of <br /> the F&B report, the letters pertaining to the similar evaluation for a site in the Lahontan <br /> Region and the response of the Lahontan Regional Water Quality Control Board to that <br /> evaluation . <br /> In the CVRWQCB response to the EHD , the CVRWQCB held that the F&B evaluation <br /> formed the basis for a hypothesis that a second release had occurred , but that the <br /> CVRWQCB would want corroborating evidence to confirm that hypothesis , a position <br /> �I <br /> II <br /> Second Release Evaluation 0409 <br />