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Mr Kyle Christie August 4, 1995 Page 4 • Brown and Caldwell, on behalf of ARCO, will place monitoring wells W-2A, W-2B, W-4, W-7, W-8, W-10, W-11, and W-12 on a senu-annual sampling schedule These wells are either upgradient, cross gradient, have historically been non-detect for petroleum hydrocarbons, or are near other wells which provide sufficient data The wells will be sampled in the first quarter of each year SUMMARY OF WORK Work Completed in Second Quarter 1995 • Continued monitoring SVETS and optimized system performance • Submitted first quarter 1995 groundwater monitoring and remediation system evaluation report • Sampled site groundwater monitoring wells for second quarter 1995 Sampling performed by EMCON • Prepared SJVUAPCD reports detailing operation and destruction removal efficiency of the SVETS • Reconfigured SVETS to remediate entirely through the biofilter • Removed the catalytic oxidizer for use at another site • Attempted to properly (according to State of California Water Well Standards) abandon well W-6 on May 26, 1995 using a Brown and Caldwell contracted drill rig The well location had been identified by a Boston Market environmental consultant using ground penetrating radar (GPR) However, no evidence of well W-6 was found in the area where the GPR had identified it would be Submitted a letter to the County documenting the work and requesting that Boston Market take the lead in the abandonment of W-6 • PIaced wells W-2A, W-2B, W-4, W-7, W-8, W-10, W-11, and W-12 on a semi- annual sampling schedule Work Anticipated During Third Quarter 1995 • Continue monitoring of SUETS and optimization of Biofilter system performance Use or disclosure of data contained on this sheet is subject to the restriction specified at file beginning of tills document 2065\ E RTS\2ND95QTR RPT