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OpOUliy <br /> ENVIRO <br /> z�.• _.._-.co N NTAL ALTH <br /> Donna <br /> :< K. eran, R.E.H.S. SAN JOAQUIN COUNTY EPARTIVIENT <br /> Director l.O U `J <br /> 09. P• Laurie A. Cotulla 304 East Weber NT 1 <br /> �iFaRN >R.E.H.s. Avenue, Third Floor Program Coordinators <br /> Assista�zt Director StOCICtori, Califo <br /> rnia 95202-2708 Carl Borgrnan,R.E.H.s. <br /> Telephone: (209 Mike Huggins,R.E.H.S., <br /> Fax: <br /> Telephone <br /> ( )468-3420 Margaret La orio, R.E. R•D.I. <br /> 464-0138 Roberta CClellon, R.E.H.S. <br /> S. <br /> Website: Jeff Ca <br /> Jeff Mesco, R.E.H.s. <br /> DENIS L. BRO KaseyFoley, R.E.H.S. <br /> SHELL OIL � <br /> PRODUCTS US <br /> USE <br /> - ENVIRO <br /> 20945 HIL14I qG4ENTAL SERVICES AUG 0-9 2006 <br /> CARSOX "A 9 810- NGTOM AVE14UE <br /> ti 90810-1039 <br /> RE: Interstate Shell <br /> 620 West Charter Way <br /> Stockton, California 95206 SITE CODE: <br /> 1058124 <br /> The San Joaquin County Investigation Re �' Environmental <br /> Environ Port (the re Health Department <br /> Environmental Technologyport)' dated 06 April 2006 (EHD) has reviewed <br /> report documents the ' Inc. (Cambria) on Prepared and Subsurface <br /> unauthorized release from <br /> from Your behalf for submitted by Cambria <br /> m the a cone the above-referenced <br /> subsurface investi under penetration testing (CPT) <br /> site. The <br /> investigation was conducted storage tank (UST ) investi <br /> and twinnegati <br /> d direct- y ad rage <br /> ) facility on the sub ect�on Of the <br /> subject site and push borings to depths as g six CPT born The <br /> seventh adjacent sites to collect soil and <br /> as 100 gs (CPT-12 through proposed CPT feet below surface gh CPT-17) <br /> Utilities. boring location had to groundwater SamFade (bsg) on the <br /> be abandoned Ples for laboratory anal <br /> due to the presence YSIs. A <br /> A continuous to of underground <br /> the soil p g °f computer-interpreted soil <br /> enetrated for each CPT boring. <br /> ponse to <br /> the com types was generated from <br /> puter-interpreted soil g' In general, collected m the CPT tool res <br /> petroleum hydrocarbons types. Soil and soil sample descriptions corroborated <br /> xylenes (BTEX quantified as groundwater samples <br /> (ETBE )> methyl Cert-bu gas°line (TPH-g), benzene p Fere analyzed <br /> ), tert-amyl methyl ether-but-VI ether (MTBE > toluene, ethylbenzene and for total <br /> and ethylene dibrometh (TAME )> di-isopropyl ether (DIPE total <br /> reported (EDB). )' tert-butyl alcohol (TBA) )� ethyl tert-bu <br /> P for each bo ) The anal tYl ether <br /> g by de analytical results for )' 1,2-dichloroethane (1,2-DCA <br /> great as 90 feet below depth, <br /> with groundwater impacted <br /> and groundwater samples ) <br /> of soil surface and cograde (bs mpacted b Ales were <br /> assessment based on the reritamsults was not g) °ff--site. An anal Y 1,2-DCA reported <br /> presented in the re analysis but <br /> icor e tion of the distribution depths as <br /> were provided. report, but recommendations foradditial <br /> Based on the lack of additional <br /> and shallow detectable concentrations of <br /> saturated zone soil samples contaminants of concern(SVE) remediation, Cambria rico mples in the UST area following rn in vadose <br /> at this time. recommended that zone <br /> no additional soil a soil vapor extraction <br /> • Detection sampling be conducted <br /> Cambria to f MTBE in shallow <br /> recommend installationo°f awater samples <br /> McDonald's Restaurant shallow from CPT-14 <br /> TBA in the s property on the groundwater and CPT-16 lead <br /> "-gradient direction. north side of monitoring well on the <br /> Charter Way to assess MTBE and <br />