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• Mr Terry Tarditi <br /> May 17, 2002 <br /> Page 2 <br /> Groundwater Sample Requirements <br /> BC's Workplan for Quarterly Sampling of Monitoring Wells describes that all wells <br /> will be sampled and water levels measured quarterly Qanuary,April,July and <br /> October) A report summarizing these activities is due to PHS/EHD the month <br /> following the end of the previous quarter(April,July, October, and <br /> January) Samples are requited to be analyzed for the following constituents total <br /> petroleum hydrocarbons as gasoline (TPH-G), by EPA method 8015 <br /> Modified, benzene, toluene, ethylbenzene,and xylene (BTEX), and oxygenates by <br /> EPA method 8260B <br /> Due to field staff scheduling conflicts this site was not sampled until March 2002 but <br /> still within the first quarter The second quarterly sampling will be conducted in <br /> June 2002, the third quarter will be sampled in August 2002, and the fourth quarter <br /> will be sampled in October 2002 in order to get back on schedule <br /> Groundwater Disposal. <br /> Purge water from this sampling event was placed into drums and disposed of <br /> properly by T&T Trucking, Inc <br /> Quarterly Results Summary: <br /> Analytical laboratory Ki££Analytical,Inc, Davis, <br /> California (California <br /> Department of Health Services <br /> Certification No 2336) <br /> Sample exceptions None <br /> Shallow groundwater gradient Flat <br /> Shallow groundwater flow direction Flat <br /> Average depth-to-water 6411 feet <br /> Average change in shallow groundwater <br /> elevation from previous quarter 4 60 feet <br /> Field data sheets from the March 2002 quarterly groundwater sampling event are <br /> included as Attachment A Historical groundwater elevation data is summarized in <br /> Table 1 Table 2 summarizes groundwater flow direction and gradient Table 3 <br /> summarizes the historical analytical results for petroleum hydrocarbon constituents <br /> Laboratory reports for the groundwater samples collected for this sampling event are <br /> included as Attachment B A comparison of last quarter's groundwater analytical <br /> • results with this quarter's sampling results is summarized below in Table 4 <br /> Thu report uru prepared in accordance wtth the standar&of the enmronmental ronsultrng industry at the ttme it was prepared It should not he <br /> rrhed upon by parties other than those far wham it war prrpared,and then on#to the extent of the scope of u+vrk which was authorized Thu <br /> report does natguarantee that no additional environmental contamination heyond that described in this report exists at the site <br /> P\21000\21417\Reports\lst-02gtrdoc <br />