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S E C O R <br /> Ms. Victoria McCartney <br /> June 11, 2004 <br /> Page 5 <br /> • <br /> Number of Detections Minimum Maximum <br /> Constituents Above the MDL of the 11 Detection in pg/L Detection in pglL <br /> Total Samples (Sample ID) (Sample ID) <br /> TPHg 4 610(MW-7 W) 29,000(MW-150-W) <br /> TPHd 9 110(MW-17-W) 8,500(MW-15-W) <br /> TPHmo 10 43(MW-13-W) 1,400(MW-15-W) <br /> r <br /> Benzene 4 4(MW-7-W) 2,400(MW-15-W) ❑i <br /> Toluene 4 0.8(MW- -W) 2,400(MW-15D-W) lu <br /> Ethylbenzene 4 4(MW-7W) 1,300(MW-15D-W) <br /> Total Xylenes 4 1(MW-7-W) 4,100(MW-15D-W) <br /> MtBE 1 2(MW-17-W) 2(MW-17-W) <br /> TBA 1 250(MW-15-W) 250(MW-15--W) <br /> Explanations: <br /> MW-7-W=Monitoring Well 7 water sample <br /> MDL=Method detection limit <br /> pg/L=Micrograms per liter <br /> (Votes: <br /> Methanol, Ethanol,EtBE,TAME,EDB , DIPE,and 1,2-DCA were reported below laboratory detection limits. <br /> CONCLUSIONS <br /> Based on the results of assessment activities, groundwater appears to be impacted with petroleum <br /> hydrocarbons beneath the former USTs removed in 1990 to a maximum depth of 116 feet bgs. Soil <br /> and groundwater does not appear to be impacted with petroleum hydrocarbons in the area of the <br /> former USTs removed in 2003. ;; f ,7, ;;: ;r, r• "` i ,' <br /> RECOMMENDATIONS <br /> During the third quarter 2004, SECOR will prepare and submit a work plan to install monitoring wells <br /> to confirm impacts to deeper water bearing zones identified by CPT activities. <br /> If you have any questions regarding the content of this report, please contact David Eva <br /> SECOR at (916) 861-0400 extension 234 or Bob Cochran of Chevron at(925) 842-9655. .��RED GFp� <br /> �5 4e T. Fag D <br /> Sincerely, ¢ y <br /> SECOR International Incorporated o No0 3 <br /> t� <br /> David Weigner George T. OP CALF <br /> Staff Scientist Associate Geologist <br /> DW <br /> Draft 2004 Site Assessment(Geo's Comments).docl\Server\files\Projects\Chevron\Retaill#9-05571Draft 2004 Site <br /> Assessment(Geo's Comments).doc <br />