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r <br /> Ms Linda Turkatte <br /> Page 2 <br /> Samples were placed on ice and transported under chain of custody to Argon Laboratories (DHS <br /> #1873) where they were analyzed for BTEX and TPHg using EPA methods 8020 and modified <br /> 8015, respectively Well MW-13 was also ana'yzed for methyl tert-butyl ether (MTBE) Recent <br /> analytical results of groundwater samples are summarized in Table 2 Attachment B contains <br /> laboratory reports and chain of custody documentation <br /> Elevated levels of petroleum hydrocarbons were detected in groundwater samples collected from <br /> all wells, except MW-7 Wells MW-11 and MW-12, located east of the former underground <br /> storage tanks (USTs), had TPHg concentrations of 76 and 190 parts per billion (ppb), { <br /> f respectively, and BTEX were nondetectable The highest concentrations of TPHg and BTEX <br /> were detected to samples collected from wells MW-2 and MW-13, located southeast and east, <br /> respectively, of the former USTs <br /> i <br /> Recommendations <br /> Continue quarterly monitoring and sampling in order to evaluate the extent of gasoline <br /> hydrocarbons to 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 if you have any questions regarding this quarterly monitoring and sampling event <br /> I <br /> 1 <br /> Sincerely, { <br /> Ground Zero Analysis, Inc <br /> RED G 0 <br /> 4�� <br /> Jeanne Buckthal <br /> Sta Geologist � J'h <br /> GREGORY P. <br /> STAHL <br /> f * No 5023 <br /> I Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeologist 264 lF OF CAL1F�� <br /> Attachments <br /> PC Mr Carl Knowles <br /> Mr Kerry Zimmerman, Law Offices of Riddle & Isola <br /> Ms Elizabeth Thayer, CRWQCB Sacramento <br /> ernundu Iraekl2ym 1996 <br />