ARCHIVED REPORTS_XR0006705 - Laserfiche WebLink

Home Browse Search

Canepa s Car Wash 6230 Pacific Avenue Stockton,CA Third Quarter Groundwater Monitoring Report,July 2005 Page 2 of 8 Table 1 • Summary of July 2005 Quarterly Groundwater Monitoring Results Field Activit Number of groundwater monitoring I I Number of wells sampled 12 wells (not including soil vapor extraction well SV-4) Number of groundwater monitoring 11 Date(s) monitored and sampled 7/28/2005 wells measured for water level I Site Hydrology Average depth to groundwater below 38 80 feet Average increase(+)/decrease(—) in 0 42 feet shallow monitoring well measuring depths to groundwater since last (deeper) ' points sam lm Approximate flow direction and 0 0049 ft/ft towards the Northeast groundwater gradient Groundwater Contamination Monitoring wells containing free None Monitoring wells with petroleum 1 product(not including SV-4) hydrocarbon odor noted(not including SV-4) MW-2) ' Number of monitoring wells with 7 Number of monitoring wells with 4 concentrations below both the concentrations at or above either or (MW-1,MW-2, benzene and MTBE MCLS both the benzene and MTBE MCLS MW-3, MW-11) Nature of contamination BTEX, Range of analyte concentrations ' Gasoline detected in the monitoring wells Oxygenates/ Benzene (lig/L) <0 5 —9,660 Additives, Toluene(pg/L) <0 5—4,480 ' TPH-G Ethyl Benzene (pg/L) <0 5 —2,060 Total Xylenes(pg/L) <1 0—4,392 MTBE(pg/L) <0 5— 12,300 1, 2-DCA(�ig/L) <0 5 —55 2 TAME (pg/L) <05 —<l 0 TPH-G (mg/L) I <0 05—34 60 Note Pumping well MW-1 was inactive rFIELD OBSERVATIONS On July 28, 2005, Condor representatives made field observations and collected depth to groundwater ' measurements at the 11 Site monitoring wells (MW-1 through MW-7, and MW-9 through MW-12D) and at one soil vapor extraction well (SV-4) MW-1 and MW-11 are used for groundwater extraction related to the operation of the groundwater treatment system Field observations included appearance of samples (color, clarity, and presence of petroleurn product sheen or phase in samples), collection of water quality field parameters, and any other conditions of note Depth to groundwater measurement data is provided in Table 2, on the following page, field observations are included in the field forms (Attachment E) No sheen or separate phase petroleum was noted in bailed field inspection samples from any of the Site monitoring wells, however, sheen was observed at SV-4 A slight petroleum hydrocarbon odor was noted in monitoring well MW-2 and soil vapor extraction well SV-4 had a strong hydrocarbon odor �l ' CONDOR