ARCHIVED REPORTS XR0006553 - Laserfiche WebLink

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CLEARWATER ' G R 0 L P I \ C Envnunrrrrntal Serrrrrs fThe general groundwater flow direction and gradient for this quarter (Figure 3) were similar to conditions previously observed at the site The extent of dissolved-phase gasoline contamination remains well delineated by the existing monitoring well network (Figure 4) Contaminant concentrations this quarter generally appear to have remained stable (MW-1) or decreased slightly (MW-2) from those detected in during the quarter since the start of the SVE/AS system in early October 1998 Groundwater monitoring data and analytical results are presented in Table 1, and laboratory analytical reports are attached in Appendix C 3.0 SOIL VAPOR EXTRACTION AND .AIR SPARGE SYSTEM The SVE/AS system design includes seven wells plumbed for vapor extraction (VW-1 to VW-4, MW-1, MW-2, and RW-1), and two wells plumbed for air sparging (SW-1 and SW-2) (Figure 2) The remediation system was constructed in nud 1998 in accordance with Clearwater's Problem Assessment Report, Feasibility Study, and Remedial Action Plan dated February 21, 1996, Revised Remedial Action Plan dated November 12, 1996, and Constructions Specifications dated March 28, 1997 The system was tested on September 28, 1998 for initial compliance testing according to the SJVUAPCD ATC pernut #N-3868-1-0 (Appendix D) Mr Craig Mitchell, the SJVUAPCD representative, was present on-site to witness verification testing Results of the verification testing indicated that the system was operating witlun compliance of the permit, and the remediation system was restated for full operation on October 7, 1998 Results of initial system testing were presented in Clearwater's letter report dated October 1, 1998 3.1 Operational Data -- Soil Vapor Extraction and Treatment Petroleum hydrocarbon vapors extracted from soil and groundwater are treated by a Solleco ECAT ' 250 all electric catalytic oxidizer(catox) D-107 4Q98 GW & Sys Mon Report 3 January 27, 1999