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F r 0 R - -- 7-Eleven Store#20632 • Offsite Assessment Report May 18, 2005 Page 4 approximately five to six volumes of water from the screen, and to collect a grab groundwater sample The groundwater samples were transferred into laboratory-cleaned sample containers, sealed with Teflon`s-lined caps, labeled, and placed on ice in an Insulated container Groundwater samples were transported under chain-of-custody documentation to Kiff Analytical, a California- certified laboratory The samples were analyzed for TPHg, BTEX, and five fuel oxygenates MtBE, EtBE, DIPE, TAME and TBA by EPA Method 8260B Boring Destruction Following completion of soil and groundwater sampling, each boring was filled with neat cement to two feet bgs and then filled to grade with native soil generated during the boring activities Waste Disposal Soil generated during boring activities was temporarily stored onsite in a properly labeled 55- gallon drum Four discrete soil samples were collected from the drum and transported to Kiff Analytical under chain-of-custody documentation for profiling The four discrete soil samples were combined in the laboratory Into one composite sample (SP-1 [ABCD]) and analyzed for TPHg and BTEX by EPA Method 826013, and total lead by EPA Method 60108 (Table 2) Fallowing acceptance of the soil profile data, Belshire Environmental Services Inc transported the non-hazardous soil on March 9, 2005 The drum of soil was recycled at the TPS Technologies Soil Recycling facility located in Adelanto, California A Copy of the waste disposal documentation is provided in Attachment C RESULTS OF SAMPLING ANALYSIS Soil Sample Analytical Results With the exception of soil sample S13-3A soil samples analyzed contained no concentrations of TPHg, BTEX or MtBE above laboratory reporting limits MtBE was detected at 0 06 mg/kg in soil sample SB-3A at eight feet bgs Copies of the laboratory reports are in Attachment D Soil analytical results are shown in Figure 4 and summarized in Table 2 Grab Groundwater Sample Analytical Results BTEX and TPHg was not detected with concentrations above the laboratory reporting limits in the eight groundwater samples Samples collected from SB-1 B, S13-2A, SB-3A and SB-313 contained concentrations of MtBE at 0 77 ug/L, 3,300 ug/L, 230 ug/L and 0 55 ug/L, respectively TBA and TAME were detected in S13-2A at 11,000 ug/L and 4 1 ug/L, respectively Grab groundwater sample analytical results are presented on Figure 5 and summarized in Table 3 Copies of the analytical data are in Attachment D SUMMARY AND CONCLUSIONS On January 31, 2005, eight soil borings were advanced by hand auger in the EBMUD property adjacent to and south of the subject site Soil samples submitted for analysis resulted in one 117-Elevenl7-11 Stores1206321Reports120632 Assessment Report 05-8-05 doc