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First Quarter 1996 Monitoft and Samplug Report 2 <br /> . The Southland Corporation,455 Grand Une Rd,Tracy,CA April 291996 <br /> Monitoring Well Sampling and Analytical Results <br /> Groundwater samples were collected from wells MW4,MW-5,MW-8,MW-9, MW-10, and GWE-1 <br /> Before sampling, at least three well-casing volumes of groundwater was removed from each <br /> monitoring well, unless the well was purged dry Field measurements of temperature,conductivity, and <br /> pH were recorded during well purging The groundwater samples were collected using disposable <br /> bailers and placed in analysis-specific sample containers with analysis-specific preservatives The <br /> samples were then sealed and labeled with the fob identification number,the sample number,date, <br /> time,and type of laboratory analysis required A water sample from the groundwater extraction well <br /> GWE-1 was collected while the well was pumping The samples were stored on ice in an insulated <br /> container and transported under chain-of-custody manifest to GTEL Environmental Laboratories, Inc in <br /> Wichita, Kansas The groundwater samples were analyzed for BTEX,MTBE and TPH-G using <br /> Environmental Protection Agency(EPA) methods 8020/modified 8015 <br /> Dissolved hydrocarbons were detected in groundwater samples from monitoring wells MW-5,MW-8, <br /> MW-9 and MW-10 (Table 1) Benzene and TPH-G concentrations were greatest In groundwater <br /> from MW-10 at 5,000 micrograms per liter(ug/L)and 29,000 ug/L, respectively MTBE was reported in <br /> samples collected from MW-8 and MW-9 at 18 ug/L and 380 ug/L, respectively(Figure 3,Attachment <br /> 1) The laboratory analytical reports and the chain-of-custody records for the March 20, 1996 sampling <br /> event are included in Attachment 4 <br /> • Please contact Groundwater Technology's West Sacramento office if you have any questions or <br /> comments regarding this report <br /> Sincerely, <br /> Groundwater Technology,Inc Groundwater Technology,Inc <br /> Submitted by Approved By <br /> fln�17-1— <br /> Bruce <br /> D Beale Jaff S Auchterlonie <br /> Associate Geologist Lead Geologist <br /> -tetProject Manager r <br /> c <br /> No 44�� r # Simonis, R G <br /> enior Geologist <br /> c Ms Elizabeth Thayer,Caldo ria usility Control Board-CVR <br /> Ms Mary Meay' San Joaquin IP eatth Services <br /> Attachments <br /> 1 Figures <br /> 2 Table 1 <br /> • 3 Field Data Sheets <br /> 4 Laboratory Analysis Report <br /> 02310198 RPT(STILES' t) ❑❑❑ GY m. <br />