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Canepa's Car Wash <br /> 6230 Pacific Avenue,Stockton,CA <br /> Fourth Quarter Groundwater Monitoring Report,November 2003 <br /> Page 2 of 6 <br /> Table 1 <br /> 0 Summary of November 2003 Quarterly Groundwater Monitoring Results <br /> Field Activit <br /> Number of groundwater monitor wells 11 Number of groundwater monitor wells 7 <br /> sampled <br /> Number of groundwater monitor wells 7 Date(s)monitored and sampled 11/9/03 <br /> monitored <br /> Site Hydrology <br /> Average depth to groundwater below * 38.44 Average increase (+)/decrease(—) in * + 1.96 feet <br /> monitor well measuring points feet depths to groundwater since last sampling (Deeper) <br /> Approximate flow direction and Northeast .0049 ft/ft as measured between wells <br /> roundwater gradient MW-6 and MW-9 <br /> Groundwater Contamination <br /> Monitor wells containing free product None Monitor wells with petroleum 2 <br /> hydrocarbon odor noted <br /> Number of monitor wells with I Number of monitor wells with 3 <br /> concentrations below both the benzene concentrations at or above either or both <br /> and MTBE MCLs the benzene and MTBE MCLS <br /> Nature of contamination: BTEX, Range of analyte concentrations detected <br /> TPH-G, in the monitor wells: <br /> Gasoline Benzene (pg/L) <0.5— 1,200 <br /> Oxygenates Toluene(Ag/L) <0.5 — 1,100 <br /> /Additives Ethyl Benzene (µg/L) <0,5—3,600 <br /> Total Xylenes (pg/L) <0.5—5,880 <br /> TPH-G(mg/L) <0.05—51 <br /> 0 MTBE (pg/L) <0.5— 1,100 <br /> 1,2-DCA (Mg/L) <0.5— 110 <br /> TAME(pg/L <0.5— 1.8 <br /> TBA(pg/L) <5.0—72 <br /> * Monitor wells MW-2,MW-5,MW-10,and MW-1 lnot used in calculation of averages.Monitor wells MW-5 and MW-10 were paved over and <br /> not located until November 10,2003. Water level data obtained from monitor wells MW-2 and MW-1 I is believed to be erroneous. <br /> FIELD OBSERVATIONS <br /> On November 9, 2003, Condor representatives made field observations at 7 of the 11 site monitor wells <br /> (MW-1 through MW-4, MW-9, MW-11, and MW-12D), and at one soil vapor extraction (SVE) well <br /> (SV-4). Field observations included water level measurement (Table 2, on the following page), <br /> appearance of samples (color, clarity, and presence of petroleum product sheen or phase in samples), and <br /> collection of water quality field parameters. Field observations are included in the field forms, <br /> Attachment D. <br /> A sheen was noted in the bailed field inspection sample collected from SV-4. No sheen or separate phase <br /> netroletirn WAC nnti-rl in hailed fiPlri incnPr•tirnn camntac fi-nm omw of t e offer cite rnnnitr•r wells. Urge <br /> .. .t . .. ... x ..,n ,.�. .....�. .6. <br /> water from monitor wells MW-1 and MW-2 was soapy appearing. A strong petroleum odor was noted in <br /> monitor wells MW-1, MW-2, and in soil vapor extraction well SV-4. <br /> 0 <br /> ow <br /> CONDOR <br />