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• QUARTERLY GROUNDWATER MONITORING AND SAMPLING REVIEW <br /> QUARTERLY GTS MONITORING AND SAMPLING REVIEW <br /> 4614 W TURNER RD LODI <br /> PAGE <br /> Following the initial excavation , 15 sail oorings were arilled , <br /> between. May 15 and lune -' 1989 Laooratory results of soil <br /> analyses determined the presence of petroleum hydrocarbons in <br /> concentrations exceeding 100 mg/ kg in tae area surrounding the <br /> tank excavation After completion , 10 of the borings were <br /> convertea to groundwater monitoring wells ( Figure 2 ) Initial <br /> sampling of the ,cells indicated the presence of benzene in <br /> concentrations above the DHS Mafimum Contaminant Levels (MCL ' s ) <br /> for drinking water in three or the welts <br /> In the fall of 1992 , a grounawazer treatment system was installed <br /> in MW 1 A report on the installation of this system has been <br /> submitted to San Joaquin Public Health Services and to Central <br /> Valley Regional Water Quality Control Board <br /> Groundwater ani_ Groundwater_ Treatment Svstem GTS } Monitflrzna and <br /> Sam- l ina- - - -- - - - -- — <br /> Results rrom earlier quar,erly samplings have been submitted in <br /> previous reports The quarterly sampling coverea in this report <br /> • was conducted by Caltest Analytical Laboratories The results of <br /> the findings are summarized in the following sections <br /> Groundwater levels are presentea in fable 1 Analytical results <br /> are Dresented in Table 2 Copies of the laboratory reports are <br /> presented in Attachment 1 <br /> FIRST QUARTER 1995 - Sampled on Mardi 1 1995 <br /> Groundwater levels were obtained from monitoring wells #1 , #3 , #4 <br /> and #5 Samples were obtainea from monitorina wells #1 and #3 at <br /> the site Monitoring Well 41 has been converted into an <br /> extraction well The GTS was turned on for one clay to purge MW-1 , <br /> and the sample was taken from an in- luent sampling Dort in the <br /> GTS MW-9 was damagea in 1990 ana cannot rye sampled The <br /> remaining wells ( 2 , 4 , 5 6 , 7 8 and 1^ ) were not scheduled to be <br /> sampled during this round of sampling The effluent to the GTS <br /> was not samplers <br /> Groundwater levels at the four points average 15 Al feet below <br /> the surface This represents an average rise of 0 63 feet from <br /> the third quarter of 1994 the last tame crater levels were taken <br /> Lab analysis snows no contaminants in MW-1 or in MW-3 <br />