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Y Mr Chuck Carmel August 15, 1994 Page 3 (0 5 pg/1) and xylenes (0 6 µg/1) Additionally, a different analytical laboratory analyzed the samples this quarter, and they used a lower detection limit (0 3 µg/1) for benzene, toluene, and ethylbenzene than the previous laboratory (0 5 pg/l) Therefore, the low concentrations of BTEX identified in the ATR-1, 2, and 9 through 12 samples are attributed to sample handling (based on the presence of toluene and xylenes in the trip blank) and/or to the lower detection limits BTEX and TPH-G were not identified in the ATR-7 sample Well ATR-3 had not been sampled since the fourth quarter of 1991 due to the presence of free product in the well, however, this quarter no free product was present, and a sample was collected in which moderate concentrations of BTEX (27 pg/l to 200 µg/1) and TPH-G (1,900 pg/1) were identified Well ATR-8 contained 0 14 feet of free product and was not sampled ARCO is preparing a work plan for the installation of air sparge and soil vapor extraction wells at this site The work plan will be submitted to the County and Regional Board by July 20, 1994 Upon approval of the work plan by the County, drilling permits will be secured and drilling will be scheduled These wells will become part of the remediation system currently being designed for the site The remediation system will be installed autumn of 1994 SUMMARY OF WORK Work completed in First Quarter 1994 • Prepared and submitted fourth quarter 1993 groundwater monitoring report • Sampled groundwater wells for first quarter 1994 Sampling performed by GTI Work Anticipated During Second Quarter 1994 • Sample groundwater monitoring wells for second quarter 1994 Sampling to be performed by GTI If you have any questions regarding this quarterly report, please contact me at (916) 444-0123 Use or disclosure of data contained on this sheet is subject to the restriction specified at the beginning of this document 12641REP0RTSX1ST94Q"IR RPT