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' First Quarter,2003 Quarterly Groundwater Monitoring Report Canepa's Car Wash,Pacific Avenue,Stockton,CA Page 5 SOIL VAPOR EXTRACTION SYSTEM • Quarterly soil vapor sampling from the influent, mid tank and effluent sample ports was conducted on December 19, 2002 The soil vapor samples were analyzed for BTEX constituents, TPH-G, and MTBE During the December SVE sampling event, benzene was detected in the soil vapor sample collected from the effluent port at a volume concentration of 0 79 parts per million (ppm) Analytical results of the vapor samples are included in Table 4, below, and in Attachment C Laboratory certificates of analyses and chain of custody record are included in Attachment E Table 4 SVE System Vapor Sample Laboratory Analytical Results (December 19, 2002) Date Sample ID benzene I toluene eth l benzene xylenes I MTBE I TPH-G PTD( m 12/19/2002 1707B-influent-12/19/02 020 036 <0 15 1 3 <1 5 27 20 12/19/2002 17078-midtanks-12/19/02 049 1 1 <0 15 <0 25 1 5 17 10 12/19/2002 1707B-effluent-12119/02 079 <0 15 <0 15 <0 25 <15 <10 4 Note Air matnx units are reported as ppmv(mgL)L) ppm=Parts per million PID=Photoionization detector FUTURE WORK/RECOMMENDATIONS Condor submitted a Problem Assessment Report(PAR) and Corrective Action Plan (CAP), dated October 18, 2002, for the site The next quarterly groundwater monitoring event is scheduled for April 2003 LIMITATIONS AND SIGNATURE • This report was prepared under the direct supervision of a Registered Geologist in the State of California The standard of care for all services performed or furnished by Condor is commensurate with the care and skill ordinarily used by a member of the environmental profession practicing under similar conditions at the same time in the same locality Condor is not responsible for the accuracy and completeness of information collected and developed by others This report was prepared for the sale use of Remo Canepa, and may not be used or relied upon by any other person(s) without the express written consent and authorization of Remo Canepa and Condor If any changes are made or errors found in the information used for this report, the interpretations and conclusions contained herein shall not be considered valid unless the changes or errors are reviewed by Condor and either appropriately modified or re-approved in writing Any questions regarding the content of this document should be addressed to Don Kresse at(209) 234-0518 Respectfully submitted, CONDOR EARTH TECHNOLOGIES, INC ✓� No. 6430 Micheline Doyle Kipf Don Kresse Staff Geologist California Registered q 'OF OAL1F0`�� Geologist#6430 - 4M i1� CONDOR