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i <br /> Ms Linda Turkatte <br /> Page 2 <br /> 8015, respectively Well MW-13 was also analyzed 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 /> 6 � <br /> Petroleum hydrocarbons were detected in groundwater samples collected from all wells, except 1 <br /> MW-7 Wells MW-11 and MW-12, located east of the former underground storage tanks <br /> (USTs), had TPHg concentrations of 69 and 95 parts per billion (ppb), respectively, and BTEX <br /> were nondetectable Wells MW-3 and MW-4, located south of the former USTs, had TPHg <br /> concentrations of 140 and 210 ppb, respectively, and BTEX constituents were below or near the <br /> laboratory detection limits. The highest concentrations of TPHg and BTEX were detected in <br /> I samples collected from wells MW-2 and MW-13, located southeast and east, respectively, of the <br /> former USTs <br /> Recommendations <br /> Ground Zero recommends continued quarterly sampling to monitor the extent of gasoline <br /> hydrocarbons in groundwater, and implementing the site Remedial Action Plan (RAP) upon <br /> B <br /> approval of the RAP budget by the UST Cleanup Fund. <br /> The next sampling event is scheduled for November 1996 Your office will be provided 48- <br /> hours notice of any field work <br /> Please call if you have any questions regarding this quarterly monitoring and sampling event. <br /> Sincerely, <br /> Ground Zero Analysis, Inc <br /> i <br /> ' Y ` L <br /> ED GEp<O <br /> John P Lane <br /> Se Geologist` �a <br /> � GREGORY P. � <br /> STAHL <br /> }� No 5023 'f I <br /> Gregory P Stahl, RG 5023 <br /> CA Certified Hydrogeolognst 264 of CA1-�F�� <br /> Attachments <br /> PC Mr Carl Knowles <br /> Mr Glen Van Dyke, Law Offices of Riddle & Isola <br /> Ms. Elizabeth Thayer, CRWQCB Sacramento <br /> gromdzcVoek0gm1996 <br /> I <br />