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1 Cartepa's Car Wash <br /> 6230 Pacific Avenue,Stockton,CA <br /> Fourth Quarter Groundwater Monitoring Report,October 2004 <br /> Page 2 of 6 <br /> Table 1 <br /> Summary of October 2004 Quarterly Groundwater Monitoring Results <br /> Field Activit <br /> Number of groundwater monitoring 11 Number of groundwater monitoring 5 <br /> wells(does not include soil vapor wells sampled <br /> extraction well SV-4 <br /> Number of groundwater monitoring 11 Date(s)monitored and sampled 10/14/2004 <br /> wells measured for water level <br /> Site Hydrology <br /> Average depth to groundwater below 40 63 feet Average increase(fl/decrease(—) in + 147 feet <br /> shallow monitoring well measuring depths to groundwater since last (deeper) <br /> points sampling <br /> Approximate flow direction and Northeast 0 0055 ft/ft as measured between wells <br /> groundwater aLathent MW-6 and MW-9 <br /> Groundwater Contamination <br /> Monitoring wells containing free None* Monitoring wells with petroleum 1 <br /> product(does not include SV-4) hydrocarbon odor noted(does not <br /> include SV-4 <br /> Number of monitoring wells with 3 Number of monitoring wells with 2 <br /> concentrations below both the benzene concentrations at or above either or <br /> and MTBE MCLs both the benzene and MTBE MCLS <br /> Nature of contamination BTEX, Range of analyte concentrations <br /> TPH-G, detected in the monitoring wells <br /> Gasoline Benzene(pg/L) <0 5—7,900 <br /> Oxygenates Toluene (µg/L) <0 5— 1,100 <br /> /Additives Ethyl Benzene(gg/L) <0 5—2,500 <br /> Total Xylenes(µg/L) <1 0—5,500 <br /> TPH-G(mg/L) <0 05—37 <br /> MTBE(µg/L) <0 5—2,800 <br /> 1,2-DCA(µg/L) <0 5— 140 <br /> TAME(µ L) <5 0— 14 <br /> *Note A sheen was noted in the purge water from MW-2 <br /> FIELD OBSERVATIONS <br /> On October 14, 2004, a Condor representative made field observations at the 11 site monitonng wells <br /> (MW-1 through MW-7, and MW-9 through MW-12D) and at one soil vapor extraction well (SV-4), depth <br /> to groundwater measurements were collected from MW-2 through MW-7, MW-9, MW-10, MW-12D, <br /> and SV-4 (see Table 2 on the following page) MW-1 and MW-11 were unavailable for groundwater <br /> measurement or sample collection due to a pump installed in each well Field observations included <br /> appearance of samples (color, clarity, and presence of petroleum product sheen or phase in samples) <br /> collection of water quality field parameters, and any other conditions of note Field observations are <br /> included in the field forms (Attachment D) <br /> No sheen or separate phase petroleum was noted in bailed field inspection samples from any of the site <br /> monitoring wells and SV-4, however, a sheen was noted in the purge water bucket after purging MW-2 <br /> and SV-4 A strong petroleum odor was noted in MW-2 and SV-4 A slight sulfur odor was noted in <br /> monitoring wells MW-4 and MW-9 <br /> 4M <br /> �p� CONDOR <br />