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Canepa's Car Wash <br /> 6230 Pacific Avenue,Stockton,CA <br /> Second Quarter Groundwater Monitoring Report,April 2005 <br /> Page 2 of 10 <br /> Table I <br /> Summary of April 2005 Quarterly Groundwater Monitoring Results <br /> Field Activit <br /> Number of groundwater monitoring 11 Number of groundwater monitoring 6 <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 4/13/2005 <br /> wells measured for water level <br /> Site Hydrology <br /> Average depth to groundwater below 38 40 feet Average increase(+)/decrease (—) in - 0 61 feet <br /> shallow monitoring well measuring (excluding depths to groundwater since last (shallower) <br /> points MW-1) sampling (excluding MW1) <br /> Approximate flow direction and Cone of Drawdown=8 5 feet <br /> groundwater gradient depression Radius of influence=40 feet <br /> toward MW-1 <br /> Groundwater Contamination <br /> Monitoring wells containing free None Monitoring wells with petroleum 2 <br /> product(does not include SV-4) hydrocarbon odor noted(does not <br /> include SV-4 <br /> Number of monitonng wells with 3 Number of monitoring wells with 3 <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(µg/L) <0 5— 11,000 <br /> Oxygenates Toluene(µg/L) <0 5-.2,000 <br /> /Additives Ethyl Benzene(µg/L) <0 5—2,400 <br /> Total Xylenes (ug/L) <1 5—4,700 <br /> TPH-G (mg/L) <0 05—39 <br /> MTBE(gg/L) <0 5—2,900 <br /> 1, 2-DCA(pg/L) <0 5—40 <br /> TAME L2 <0 5—<1 0 <br /> *Does not include MW-1 because it is currently an active pumping well used in the groundwater treatment system <br /> FIELD OBSERVATIONS <br /> A Condor representative made field observations on April 13, 2005 at the I I site monitoring wells (MW- <br /> 1 through MW-7, and MW-9 through MW-12D) and at one soil vapor extraction well (SV-4) Depth to <br /> groundwater measurements were collected from MW-1 through MW-7, MW-9 through MW-12D, and <br /> SV-4 (see Table 2 on the following page) MW-1 and MW-1 I are used for groundwater extraction related <br /> to the operation of the groundwater treatment system Field observations included appearance of samples <br /> (color, clanty, and presence of petroleum product sheen or phase in samples), collection of water quality <br /> field parameters, and any other conditions of note Field observations are included in the field forms <br /> (Attachment E) <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 A slight petroleum hydrocarbon odor was noted in monitoring wells MW-2 <br /> and MW-11 <br /> • <br /> �� CONDOR <br />