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Limited Phase II Environmental Site Assessment Report <br />April 2, 2007 <br />Page 3 <br />Soil Investigation <br />SECOR supervised Cascade Drilling, Inc. during the drilling of soil boring GP-1 to a maximum <br />depth of 25 feet bgs. Soil samples were collected at 5 foot depth intervals to the total depth <br />explored. Soil samples for chemical analysis were collected in stainless steep or brass liners, <br />capped and labeled, and then placed in a cooler on ice for preservation. Soil samples collected <br />for chemical analysis were submitted to American Scientific Laboratory (ASL) in Los Angeles, <br />California, a State licensed laboratory. <br />Drilling and soil sampling equipment were cleaned prior to and after drilling activities. Upon <br />completion of the drilling, the soil boring was backfilled with bentonite grout from the bottom of <br />the boring to the ground surface. <br />Standard operating procedures are provided in Attachment B. <br />Laboratory Analysis <br />As proposed in SECOR's Work Plan, the 10, 15, 20 and 25 foot interval soil samples since were <br />submitted to ASL for chemical analysis. Collected soil samples were analyzed for total <br />petroleum hydrocarbons as gasoline (TPHg), TPH as diesel (TPHd), and TPH as motor oil <br />(TPHmo) using EPA Test Method 8015M (modified); and for volatile organic compounds (full <br />scan) including oxygenate compounds (MTBE, TAME, ETBE, DIPE, TBA and ethanol) using <br />EPA Test Method 8260B. <br />Waste Disposal <br />Generated soil and decontamination water were contained in properly labeled, Department of <br />Transportation approved open head 55-gallon drums with locking covers, and stored on site. <br />After receipt of the analytical results, the drummed material was profiled as non-hazardous <br />waste, and then transported off-site by Be!shire Environmental Services, Inc. to Clean Harbors, <br />a State licensed facility for disposal. Waste disposal documents are provided in Attachment C. <br />FINDINGS <br />Subsurface Conditions <br />Soils encountered during drilling consisted primarily of clay material to the total depth explored <br />of 25 feet bgs. Groundwater was not encountered during drilling. The generalized description <br />of the site lithology is provided on the boring log in Attachment D. <br />Soil Analytical Results <br />Based on the review of the analytical data provided by ASL, no chemical constituents were <br />reported above the laboratory method detection limits (LMDL). Soil analytical results are <br />provided in Table 1 and in the certified laboratory report in Attachment E. <br />P:/CEC/Stockton/Stockton Limited Phase II ESA Report FINAL 04.02.07 SECOR