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lIQ 2nd Avenue South, #D7,Pacheco,CA 94553 =McCAMPBELL ANALYTICAL INC Tele 510-798-1620 Fax 510-798-1622 • The Mark Group Client Project ID # 92-1177102, Stockton Date Sampled 04/04/96 Hookston Square,# 120 Scavenger Date Received 04/04/96 3480 Buskirk Avenue Client Contact Bob Spare Date Extracted 04/04-04/05/96 Pleasant Hill,CA 94523 Client P O Date Analyzed 04/04-04/05/96 Gasoline Range(C6-C12) Volatile Hydrocarbons as Gasoline*,with BTEX* EPA methods 5030 modified 8015 and 8020 or 602 California RW CB SF Bav Region)method GCFID(5030 Lab ID Client ID Matrix TPH(g)+ Benzene Toluene Ethylben- Xylenes % Rec zene Surrogate 62974 MW-3 W ND ND ND ND ND 96 62975 MW-2 W 2300,a 510 32 90 69 99 62976 MW-1 W ND ND ND ND ND 97 62977 MW-4 W ND ND ND ND ND 97 Reporting Limit unless other- W 50 ug/L 0 5 0 5 0 5 0 5 wise stated,ND means not de- tected above the reporting limit S 10 mg/kg 0 005 0 005 0 005 1 0 005 * water and vapor samples are reported in ug/L,soil samples in mg/kg,and all TCLP extracts in mg/L, #cluttered chromatogram,sample peak coelutes with surrogate peak + The followingdescriptions of the TPH chromato am are cursory in nature and McCampbell Analytical is not responsible fortheirinterpretation a)unmodified o weakly modified gasoline is significant b)heavier gasoline range compounds are significant(aged gasoline?),c)lighter ggasoline range compounds(the most mobile action) are significant, d) gasoline range compounds having broad-chromato aphic peaks are significant, biologically altered gasoline?,e-) TPH pattern thaf does not appear to be derived om gasoline (?),f) one to a few isolated peaks present,g)stronglyaged gasoline or diesel range compounds are significant,h)lighter than water immiscible sheen is present, i) liquid sample that contains greater than- 5 vol % sediment,j) no recognizable pattern DHS Certification No 1644 Edward Hamilton,Lab Director