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December 29, 1993 Page 2 Mr Terry Schull TABLE-1 Dates Qf Sad-Til-1-In-9 Date Site 1 Tilled Soil Site 2 Tilled Soil Soil Tilling Personnel Volume Volume (Sunnver/ERM) 10/25/93 60 cu yd 600 cu yd Sunriver 10/26/93 60 cu yd 600 cu yd Sunriver 10/27/93 60 cu yd 600 cu yd Sunriver 10/28/93 60 cu yd 600 cu yd Sunriver 10/29/93 60 cu yd 600 cu yd Sunriver 11/1/93 60 cu yd 600 cu yd ERM 11/2/93 60 cu yd 600 cu yd Sunriver 11/3/93 60 cu yd 600 cu yd ERM 11/4/93 60 cu yd 600 cu yd Sunriver 11/5/93 60 cu yd 600 cu yd Sunriver 11/8/93 60 cu yd 600 cu yd Sunriver 11/9/93 60 cu yd 600 cu yd Sunriver 11/10/93 60 cu yd 600 cu yd ERM 11/11/93 60 cu yd 600 cu yd Sunriver 11/12/93 60 cu yd 600 cu yd ERM 11/15/93 60 cu yd 600 cu d Sunriver Prior to collecting post treatment confirmation samples, the effectiveness of tilling for soil aeration was assessed on 3 November and 17 November 1993 by analyzing a total of six soil samples collected from the soil aeration pile by • EPA Method 8015/8020 The samples were analyzed by Anametrix Laboratory of San Jose, California, a state certified laboratory Analytical results from these soil samples indicated that the concentration of chemicals of concern were below the applicable regulatory threshold Thus, after 15 November 1993, no further soil aeration was performed The post treatment confirmation sampling was undertaken by ERM on 13 December 1993, under San Joaquin County's supervision. Twelve confirmation soil samples were collected by ERM and submitted for analysis by EPA Method 8015/8020 to Anametrix Laboratory The analytical results from 13 December 1993 confirmed that the cleanup goals for the soil were attained and that no further treatment (by aeration) was required All analytical results are presented in Table -2 The laboratory data sheets are included in Attachment A