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Canepa s Car Wash <br /> 6230 Pacific Avenue,Stockton,CA <br /> Third Quarter Groundwater Monitoring Report,July 2004 <br /> Page 2 of 6 <br /> Table X <br /> Summary of July 2004 Quarterly Groundwater Monitoring Results <br /> Field Activit <br /> Number of groundwater monitor wells 11 Number of groundwater monitor wells 11 <br /> (does not include soil vapor extraction sampled <br /> well SV-4) <br /> Number of groundwater monitor wells 1 1 Date(s)monitored and sampled 07/22-23/04 <br /> measured for water level <br /> Site Hydrology <br /> Average depth to groundwater below 39 14 feet Average increase (+)/decrease (—) in + 164 foot <br /> shallow monitor well measuring points depths to groundwater since last sampling (deeper) <br /> Approximate flow direction and Northeast 0 0047 ft/ft as measured between wells <br /> roundwater gradient MW-6 and MW-9 <br /> Groundwater Contairunation <br /> Monitor wells containing free product None Monitor wells wrath petroleum 2 <br /> hydrocarbon odor noted <br /> Number of monitor wells with 7 Number of monitor wells with 4 <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, urn the monitor wells <br /> Gasoline Benzene (µg/L) <0 5—9,500 <br /> Oxygenates Toluene (µg/L) <0 5 — 1,000 <br /> /Additives Ethyl Benzene (}ig/L) <0 5—2,300 <br /> Total Xylenes (µg/L) <1 0---3,750 <br /> TPH-G(mg/L) <0 05—40 <br /> MTBE(gg/L) <0 5 — 1,000 <br /> 1, 2-DCA(pg/L) <0 5— 110 <br /> TBA( /L) <50-26 <br /> FIELD OBSERVATIONS <br /> On July 22 and 23, 2004, a Condor representative made field observations at the 11 site monitor wells <br /> (MW-1 through MW-7, and MW-9 through MW-12D), and at one soil vapor extraction well (SV-4) <br /> Field observations included water level measurement (see Table 2), appearance of samples (color, clarity, <br /> and presence of petroleum product sheen or phase in samples), and collection of water quality field <br /> parameters Field observations are included in the field forms (Attachment D) <br /> No sheen or separate phase petroleum was noted in bailed field inspection samples from soil vapor <br /> extraction well SV4 or any of the site monitor wells A strong petroleum odor was noted in soil vapor <br /> extraction well SV-4 A slight petroleum hydrocarbon odor was noted in monitor well MW-2 A moderate <br /> sulfur odor was noted in monitor well MW-1 <br /> CONDOR <br />