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FIELD INVESTIGATION: SSI - PHASE ONE <br /> The scope of work performed for the SSI--Phase the indicated depths, or until no <br /> 1 One was developed in close coordination with the subjective evidence of impacted <br /> PHS/EHD to collect the additional remaining site conditions is encountered, whichever <br /> data necessary to comply with RWQCB criteria is greater <br /> for designation as a low-risk groundwater site + ColIect soil samples at 5-foot <br /> Specifically, these data included the following minimum intervals in each boring <br /> • Collect two Hydropunch groundwater <br /> + Additional analytical data to complete samples in each 20-foot boring, one at <br /> delineation of the lateral and vertical extent of first groundwater(about 10 feet bgs) <br /> impacted soil and allow calculation of the and one at the bottom of the borings <br /> contaminant mass in the remaining impacted (about 20 feet bgs) <br /> 1soil • Collect three Hydropunch <br /> • Depth-specific groundwater analytical data to groundwater samples in the 30-foot <br /> allow calculation of the remaining mass of boring, one at first groundwater, one <br />' dissolved hydrocarbons at about 20 feet bgs, and one at the <br /> • Demonstration that free product is not present bottom of the boring <br /> • Site specific physical and chemical data to ♦ Submit selected soils samples (up to three), <br /> assess the efficacy of remedial measures and the groundwater samples, for analyses for <br /> • Analyses of selected soil and groundwater TPHg with EPA Method 8015M and for <br /> samples for tertiary butyl alcohol(TBA), BTEX with EPA Method 8020A <br /> methyl tertiary butyl ether(MTBE),di- ♦ One soil and one groundwater sample will be <br /> isopropyl ether(DIPE), ethyl tertiary butyl analyzed for TBA, MTBE, DIPE, ETRE, <br /> ether(ETBE), tertiary amyl methyl ether TAME, and 1,2-DCA with EPA Method <br /> (TAME), and 1,2-DCA(fuel additive used as 8260B <br /> a lead scavenger)with EPA Method 8260B ♦ Test selected soil samples for physical, <br /> • A final groundwater sampling event chemical, and biological indicator parameters <br /> for bioremedial effectiveness <br /> The SSI—Phase One scope of work consisted of ♦ Perform one additional sampling round of all <br /> tasks presented originally in TVG work plan site monitoring wells within 30 days of the <br /> (TVG, 1995)and modified in HLA's Analysis of completion of the SSI <br /> SECOR Investigation and Recommendations for <br /> Additional Work; (HLA, 1997), in HLA's Work Prior to the initiation of any onsite sampling <br /> Plan Addendum, (HLA, 1998a), and in HLA's activities, Underground Service Alert(USA)was <br /> Work Plan Addendum Number 2, (HLA, 1998b) notified to trace existing public utilities present at <br /> The following scope of work was performed the site A site specific Health and Safety Plan <br /> during the SSI -Phase One was prepared consistent with the requirements of <br /> 1 ♦ Drill, log, and sample three soil bonngs near Title 8 CCR 5192 and all field work was <br /> the former UST location as follows conducted in accordance with the plan <br /> • One 20-foot boring(HP-1)east of the <br /> SOIL BORINGS AND SOIL AND <br /> former UST excavation <br /> • One 20-foot boring(HP-3)within the HYDROPUNCH GROUNDWATER <br /> forklift shop SAMPLING <br /> I • One 30-foot boring(HP-2) within the <br /> former UST excavation Three soil borings (HP-1, HP-2, and HP-3)were <br /> . • All three borings will be advanced drilled on March 26 and 27, 1998 at the locations <br /> with hollow-stem-auger methods to shown on Plate 3 The borings were advanced <br /> L1300001387371WP138737N19 Harding Lawson Associates 9 <br />