SITE INFORMATION AND CORRESPONDENCE_1998-2000

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SUR Data Collection and Field Activities Anticipated for April and May 1999 The following data collection and field activities are planned at the Site during the next bimonthly period, or have commenced or been completed since the end of the bimonthly period: • Dedicated purge equipment retrofit will be conducted on April 28, 1999. This work includes lowering dedicated purge pumps in selected groundwater monitoring wells to optimize purging during monitoring activities. • Quarterly fluid levels will be measured and groundwater samples collected during the week of May 9, 1999. • The installation of 37 soil-vapor extraction wells and 8 soil-vapor monitoring wells is scheduled to begin the week of June 7, 1999. Installation activities are anticipated to continue for six weeks. Documents Submitted or Received and Meeting During the Bimonthly Period Several documents were completed and issued during the bimonthly period and a meeting was held to discuss the Draft Phase II Detailed Plan, as follows: • "Results of Magnetometer Survey at Michael's Arts and Crafts, 6632 Pacific Avenue, Stockton, California," was submitted to the RWQCB on February 8, 1999. • Meeting with the RWQCB and LPL on February 10, 1999, to discuss the "Draft Phase II Interim Remedial Action Detailed Plan, Lincoln Center, Stockton, California." • "Phase I Interim Remedial Action Groundwater Extraction Well Upset, Lincoln Center, Stockton, California," concerning the check-valve failure on February 10, 1999, was submitted to the RWQCB on February 17, 1999. The RWQCB submitted comments to the "Draft Phase 1I Interim Remedial Action Detailed Plan, Lincoln Center, Stockton, California," submitted on January 27, 1999, in its letter of February 18, 1999. Comments were addressed, and the "Proposed Phase 11 Interim Remedial Action Detailed Plan, Lincoln Center, Stockton, California," was submitted for agency and LPL review on March 26, 1999. Air sampling data from samples taken on December 23, 1999; field logs from November 1998 through February 1999 with photoionization detector field sampling results; and print outs of air flow rates from the air stripper were submitted to the San Joaquin Valley Unified Air Pollution Control District on March 11, 1999. The "Draft Operations and Maintenance Manual, Phase I Interim Remedial Action, Groundwater Extraction and Treatment System, Lincoln Center, Stockton, California" (O&M bimomhly-Apr%-041 l i.doc:blh 3