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a <br /> Mr Harlin Knoll <br /> Page 2 of 2 <br /> Groundwater samples were submitted to Argon Laboratories (FLAP #2359) for analysis of TPHg and <br /> BTEX utilizing EPA methods 8015M and 8020, respectively <br /> Groundwater Analytical Results <br /> Elevated levels of dissolved gasoline constituents were detected in the groundwater sample collected <br /> from well MW5 and low levels were detected in the sample collected from well MW1 No gasoline <br /> conshtuents were detected in the samples collected from wells MW3, MW4 or MW8 <br /> Well MW5 contained TPHg at 33,000 parts per billion (ppb) and benzene at 4,800 ppb MW 1 <br /> contained TPHg at 70 ppb and benzene at 1 5 ppb Figure 3 presents a benzene isoconcentration map <br /> from the first quarter analytical results Analytical results are summarized in Table 3 Laboratory data <br /> sheets and chain of custody documentation are included in Attachment B Attachment C contains <br /> graphical representations of TPHg and benzene concentrations over time in site wells <br /> CONCLUSIONS AND RECOMMENDATIONS <br /> Dissolved contaminant levels in well MW5 have been gradually declining since their recorded high in <br /> December 1996 BTEX constituents in well MW5 have declined by 85-95% since December 1996 <br /> Contaminant concentrations in well MW 1 have decreased more than 94% from the recorded lughs in <br /> that well <br /> iBased upon the histone non-detect results of constituents of concern in wells MW6 and MW7, Ground <br /> Zero recommends destroying those wells under permit from PHS/EHD <br /> The next monitoring and sampling event is scheduled for May 2001 PHS/EHD will be notified at <br /> least 48 hours prior to the commencement of any fieldwork <br /> Please contact John Lane at (209) 838-9888 if you have any questions or comments regarding this <br /> submittal <br /> Respectfully, D G <br /> Ground Zero Analysis, Inc <br /> JOHN P <br /> LANE <br /> No 6795 <br /> John P Lane �'� Q <br /> CA Registered Geologist 6795 ��F OFC1'5- <br /> A <br /> Attachments <br /> cc Mr Marty Hartzell, CRWQCB Sacramento <br /> Mr Carl Knowles <br /> Mr Patrick D Riddle, Esq <br /> KPOWles hamheports/1gm2001 doc <br />