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t- <br /> Ms Linda Turkatte F- <br /> ' u} <br /> age <br /> P <br /> ' - <br /> Samples were placed on ice and transported under chain of custody to Argon Laboratories (DHS t ° y <br /> #1873) where they were analyzed for BTEX and TPHg using EPA methods 8020 and modified <br /> s also analyzed for methyl tert-butyl ether (MTBE)`. Recent, <br /> 8015, respectively. Well MW-13 wa <br /> i . .:. mples are summarized in Table 2. Attachment.B contain <br /> analytical results of groundwater sas" <br />{ laboratory reports and chain of custody documentation. r <br /> Elevated level's of petroleum hydrocarbons were detected in groundwater samples collected from p <br />! - all wells, except MW-7. Wells MW. 11 and MW-12, located east of the former underground ,r <br /> storage tanks'E (USTs), had TPHg concentrations of 76 ! and 190 parts per billion (ppb), <br /> g e <br /> respectively, Wand BTEX were nondetectable. The highest concentrations of TPHg. and BTEX <br /> were detected'` in samples collected from wells MW-2 and MW-13, located southeast and east, <br /> respectively, of the former USTs. <br /> Recommendations <br /> Continue quarterly monitoring and sampling in order to evaluate the extent of gasoline - <br /> hydrocarbons' in groundwater. <br /> The next sampling event is scheduled for July 1996. Your office will be provided 48-hours <br /> notice of any field work. <br /> Please call ifs you have any questions regarding this quarterly monitoring and sampling event. <br /> Sincerely, <br /> Ground Zero Analysis, Inc. <br /> 40 <br /> Jeanne Buckthal <br /> Sta Geologist Qr <br /> GREGORY P. <br /> STAHL <br /> j. No. 5023 <br /> Gregory P. Stahl, RG 5023 <br /> CA Certified Hydrogeologist 264 OF CA1� <br /> Attachments {i! <br /> 4 <br /> PC: Mr. Carl Knowles <br /> Mr. Kerry Zimmerman, Law Offices of Riddle & Isola <br /> <f i <br /> Ms. 'Elizabeth Thayer, CRWQCB Sacramento , <br /> grotmdu\roek\2gm1996 ,n w <br /> T"•Nt• E <br />