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• Mr Terry Tarditi <br /> January 11,2000 <br /> Page 2 <br /> Squarter(February, May,August, and November) Samples are required to be analyzed for the <br /> following constituents total petroleum hydrocarbons as gasoline (IPH-G),by EPA method 8015 <br /> Modified,benzene, toluene, ethylbenzene, and xylene (BTEC,and for volatile organic compounds <br /> (VOCs) and oxygenates by EPA method 8260B <br /> Groundwater Disposal: <br /> Purge water from this sampling event was disposed of into an on-site evaporation pond <br /> Quarterly Results Summary: <br /> Analytical laboratory Kiff Analytical,Inc,Davis, California <br /> (California Department of Health Services <br /> Certification No 2336) <br /> Sample exceptions None <br /> Shallow groundwater gradient 0 001 <br /> Shallow groundwater flow direction Southwest <br /> Approximate depth-to-water 61 to 62 feet <br /> Average change in shallow groundwater elevation 6 76 feet decrease since 9/16/98 <br /> Field data sheets from the April 1999 quarterly groundwater sampling event are included as <br /> Attachment A Table 1 summarizes the well construction details for the wells at the site Historical <br /> • groundwater elevation data is summarized in Table 2 Table 3 summarizes the historical analytical <br /> results for petroleum hydrocarbon constituents Laboratory reports for the groundwater samples <br /> collected for this sampling event is included as Attachment B A comparison of groundwater <br /> analytical results after the installation of wells MW-2 through MW-4 in August 1998 with this <br /> quarter's sampling is summarized in Table 4 <br /> Table 4. Comparison of Groundwater Analytical Results with Previous Sampling Event <br /> TPH-G Benzene MTBE(8260 B) <br /> 8/98 2nd qtr,`99 8/98 2nd qtr,`99 8/98 2nd(Itr,`99 <br /> Highest concentration,4}1g/L) 5,500 8,500 2,000 1,200 46 1,300 <br /> Well with highest concentration MW-1 MW-3 MW-1 MW-3 MW-1 MW-1 <br /> Number of weUs with detection 414 4/4 4/4 4/4 1/4 3/4 <br /> Other Constituents Detected: <br /> Other constituents (isopropyl benzene, 1,3,5-trimethylbenzene, 1,2,4-trunethylbenzene, sec- <br /> butylbenzene, and n-butylbenzene)were detected in samples from wells MW-3 and MW-4 These <br /> contaminants are common constituents of gasoline These contaminants are not regulated and have <br /> no established Maximum Contaminant Levels by the U S Environmental Protection Agency <br /> We ordisc mir of date continued on tbea sheet es sulyert to The eestnetron speed at the begerruerig oftbu doaement <br /> 01/11/00P\160D0\16271\Reports\2ndW9tr doc <br />