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Firestone Store#3573 400 North El Dorado Street, Stockton, California October 25, 1995 VES Quarterly Report and Request for Closure-4589 Page 2 of 14 I ' All samples collected during the monitoring period were transported to and analyzed by Capitola Technologies in Capitola, California, with the exception of the first sample, collected on February 6, 1995, which was analyzed by Trace Analysis Laboratories, Inc (TAL) of Hayward, California The sample collected on February 13, 1995, was analyzed by Capitola Technologies, TAL, and Superior Precision Analytical of Martinez, California Some variation was observed in the results from the three laboratories, however, attempts to identify the origin of the variation were unsuccessful (see May 18, 1995, letter report) All subsequent laboratory analyses were performed by Capitola Technologies to maintain analytical continuity throughout system operation Laboratory reports for all analyses ' performed in the second quarter are included in Appendix 7 2 The untreated extracted soil vapor (influent) sample results from Capitola Technologies are tabulated below ' Summary of Second Quarter Analytical Results (units = Molar ppm unless noted) ' Sample Date TPH-Gasoline Benzene Toluene Ethylbenzene Xylenes Feb 13, 1995 82 0 030 6 71 3 55 22 16 ' Feb 20, 1995 53 6 0 18 2 53 1 10 9 80 Feb 27, 1995 (VE-1) 704 042 3 65 1 22 11 77 Feb 27, 1995 (VE-2) nd nd nd nd nd Mar 6, 1995 605 0 25 5 32 2 76 1749 Mar 13, 1995 53 9 0 19 3 23 2 03 1054 Mar 20, 1995 569 014 3 23 1 66 13 53 Shutdown (March 24, 1995, through April 21 , 1995) Apr 21 , 1995 27 1 039 435 1 05 8 57 Apr 24, 1995 nd nd nd nd nd May 1 , 1995 432 0 11 3 45 0 15 11 32 May 8, 1995 28 7 nd 3 95 1 10 1027 nd = nondetect at reporting limit of 1 ppm for TPH-G and 0 1 ppm for BTEX RYAN-MURPHY, INCORPORATED Denver Environmental Conshvcaon Management Las Angeles r