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GROUND ZERO ANALYSIS, INC. 3422 W Hammer Lane, Suite C-294 Stockton, California 95219 Telephone. (209) 952-3481 { �� Facsimile (209) 952-9891 , July 18, 1995 t9'� Ms Linda Turkatte �i',,Vi1R0N1,1ENT,-L dEA` r- San Joaquin County-Public Health Services FERMIT/SERVICES Environmental Health Division 304 E Weber St PO Box 388 Stockton, CA 95201-0388 Subject Status Report, Subsurface Investigation, 102 South Wilson Way, Stockton, California i Ms Turkatte At your request Ground Zero Analysis, Inc (Ground Zero) has prepared this limited report on the recent environmental activities performed at subject site (Figure 1) This report presents the results of groundwater monitoring and sampling of previously existing wells and recently installed wells Per your request, the results of soil samples collected during this portion of the investigation, boring logs, and associated laboratory reports will be included in the corrective action plan due October 31, 1995 The corrective action plan will also include results of the proposed vapor extraction test to be performed by September 1995 Work performed during this investigation included drilling eleven soil borings and installing monitoring wells in four of the borings (Figure 2) The work was performed according to Mill Creek Associates' Workplan (dated December 9, 1994) and Ground Zero's Workplan Addenda (dated March 7 and April 3, 1995) Spectrum Exploration (C57 lic 512268) was the drilling contractor i Soil borings SB-33 through SB-36 were drilled to depths of approximately 75-78 feet bgs Groundwater was observed at depths ranging from approximately 57 to 59 feet during drilling of the borings Ground Zero observed Spectrum construct four 2-Inch diameter monitoring wells MW-9 through MW- 12 in borings SB-33 through S13-36, respectively The monitoring wells were screened from approximately 55 to 75 feet bgs Per your request, well construction details will be included in the corrective action plan Soil generated during drilling was stored onsite and covered with plastic sheeting pending receipt of analytical results On May 5, 6, 15 and 16, 1995 Ground Zero developed the newly installed wells On May 15 and 16, Ground Zero measured water levels, purged and sampled the newly installed wells and the previously existing wells At least three well casing volumes were purged from the wells prior to sampling Water levels in monitoring wells MWA, and MW-3 through MW-12 ranged from approximately 56 to 58 feet bgs Water was not encountered in well MW-2, and wells MW-1 and MW-3 did not recharge sufficiently to obtain groundwater samples Monitoring data and purge logs are included in