Laserfiche WebLink
Third Quarter(2003 Annual Event)Groundwater Monitoring Report <br /> Canepa's Car Wash,Pacific Avenue,Stockton,CA <br /> Page 2 <br /> Table I <br /> Summary of August 2003 Annual Groundwater Monitoring Results <br /> Field Activit <br /> Number of groundwater monitor wells 11 Number of groundwater monitor wells 11 <br /> sampled <br /> Number of groundwater monitor wells 11 Date(s)monitored and sampled 7/25, 8/1 <br /> monitored and 814103 <br /> Site Hydrology <br /> Average depth to groundwater below 36 48 feet Average increase(+)/decrease(—) in + 1 10 feet <br /> monitor well measuring points depths to groundwater since last sampling (Deeper) <br /> Approximate flow direction and East 0036 ft/ft as measured between wells <br /> groundwater gradient MW-9 and MW-10 <br /> Groundwater Contamination <br /> Monitor wells containing free product None Monitor wells noted to have hydrocarbon 3 <br /> odor <br /> Number of monitor wells with 4 Number of monitor wells with 7 <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 (1tg/L) <0 5—5,300 <br /> Oxygenates Toluene(µg/L) <0 5—230 <br /> /Additives Ethyl Benzene (µg/L) <0 5—570 <br /> Total Xylenes (µg/L) <1 0— 1,074 <br /> TPH-G(mg/L) <0 05—44 <br /> • MTBE(µg/1-) <0 5—660 <br /> 1,2-DCA (µg/L) <0 5 — 160 <br /> TAME(lig/L <05- 1 3 <br /> TBA(µ L) <5 0— 110 <br /> FIELD OBSERVATIONS <br /> On July 25, August I and August 4, 2003, Condor representatives made field observations at the 11 site <br /> monitor wells (MW-1 through MW-7, MW-9 through MW-11, and MW-12D), and at one soil vapor <br /> extraction (SVE) well (SV-4) Field observations included water level measurement (Table 2, on the <br /> following page), appearance of samples (color, clarity, and presence of petroleum product sheen or phase <br /> in samples), and collection of water quality field parameters Field observations are included in the field <br /> forms, Attachment D <br /> No sheen or separate phase petroleum was noted in bailed field inspection samples collected from the <br /> wells, however, sheen was present in the purge water from SV-4 A strong petroleum odor was noted in <br /> monitor well MW-1 and in soil vapor extraction well SV-4 Moderate and slight petroleum odor was <br /> noted in MW-2 and MW-11, respectively <br /> • <br /> 1 , <br /> �� CONDOR <br />