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2373 g Mariposa Road August 16, 1999 Prosect 9688 - Page 7 Boring Depth TPH-G TPH-D TEPH BTEX MTBE Lead No (feet) (ppm) (pp m) (Ppm) (ppm) (ppm) (ppm) B1 60 ND ND ND ND/ND/ND/ND ND ND B1 110 26 1,300 210 <0 02/<0 02/0 023/0 078 <0 02 ND B1 160 12 520 67 ND/ND/0 013/0 077 ND N D B1 210 8 780 160 ND/0011/0013/0048 ND ND B1 260 8 410 ND ND/0007/0014/0091 ND ND 1 B1 310 ND ND ND ND/ND/ND/ND ND ND B1 360 ND ND ND ND/ND/ND/ND ND 52 B1 410 ND ND ND ND/ND/ND/ND ND ND 1 B1 460 ND ND ND ND/ND/ND/ND ND ND B1 510 ND ND ND ND/ND/ND/ND ND ND B1 560 ND ND ND ND/ND/ND/ND ND ND B1 610 ND ND ND ND/ND/ND/ND ND ND B1 660 ND ND ND 0 010/0021/0 005/0 019 ND I ND Grab Groundwater Sample Analytical Results The grab groundwater sample from B1 was analyzed as recommended in the Work Plan The following table summarizes the analytical results ' Bonng Depth th TPH-G TPH-D TEPH BTEX MTBE Lead No (feet) (ppb) (ppm) (ppm) (ppb) (Ppb) (PPM) b, B1 1680 ND 05 ND 1/ND/1/2 ND ND ' ANALYTICAL CERTIFICATES Copies of certificates from the California Certified Laboratory for the soil and groundwater sample analyses are attached in Appendix C Copies of the Chain-of-Custody Forms are also included in Appendix C DISCUSSION General The investigation was carried out to obtain further information regarding the limits of the soil and groundwater contamination directly under the removed tank location One boring was drilled and sampled to 65 feet and a grab 1 groundwater sample was taken from about 68 feet Soil Conditions The soil analyses indicated that all of the soil contamination was confined to the samples from 11 feet below grade to 26 feet There was no detectable contamination in any of the samples deeper than 26 feet The maximum TPH-D concentration (1,300 ppm) was at 11 feet and decreased to 410 ppm at 26 WILLIAM DUBOVSKY ENVIRONMENTAL - - - - - - -