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Ms. Duncan <br /> August 24, 2006 <br /> Page 2 of 3 <br /> BBL does not believe the soil impacts reported in the sample collected 75 feet below ground surface(bgs) <br /> in boring CPT-1 are associated with the impacts from the underground storage tanks (USTs) reportedly <br /> abandoned in-place near MW-1. The table below summarizes the concentrations of petroleum <br /> hydrocarbon constituents detected in soil samples collected from borings advanced near MW-1, as <br /> reported in the Cone Penetrometer Testing Report dated October 17, 2003. <br /> Boring/Depth(bgs) TPH-G TPH-D Total BTEX <br /> SB-A/10 feet ND 33 ND <br /> SB-A/20 feet 3.1 170 ND <br /> SB-A/30 feet 300 2,400 7.2 <br /> SB-A/40 feet 250 1,600 32 <br /> CPT-1/55 feet ND(< 1.0) —3/, ND (< 10) ws/ 0.05 -14/i <br /> CPT-1/78 feet 4,800 —01/1 ND(<10) r`^5 i 475 "5 t <br /> few PP6 <br /> Concentrations of total petroleum hydrocarbons as gasoline(TPH-G)and benzene, toluene, ethylbenzene, <br /> and xylenes(BTEX) reported for soil samples collected from boring SB-A at depths of 10, 20, 30, and 40 <br /> feet bgs were one to three orders of magnitude lower than in the soil sample collected at the 78-foot depth <br /> interval from boring CPT-1. Total petroleum hydrocarbons as diesel (TPH-D), which was detected in all <br /> four soil samples collected from SB-A at concentrations ranging from 33 mg/kg to 2,400 mg/kg) was not <br /> detected in the soil sample collected at the 78-foot depth interval from boring CPT-1. Additionally, a soil <br /> sample collected from boring CPT-1 at a depth of 55 feet bgs was non-detect for TPH-G, TPH-D and had <br /> only slight detections of ethylbenzene and xylenes (0.020 µg/1 and 0.025 µg/1, respectively). The attached <br /> figure (Figure 4 from the Cone Penetrometer Testing Report) illustrates the soil concentrations of TPH-G <br /> and TPH-D near MW-1 in cross section. <br /> Based on the above, BBL believes the soil impacts associated with the USTs reportedly abandoned in- <br /> place near MW-1 have been delineated at a depth of 55 feet bgs. <br /> If you have any questions or comments regarding the contents of this Work Plan, please contact David <br /> Evans of BBL at (916) 857-0124 extension 226 or by email at devans(a�bbl-,)bblor myself at (315) <br /> 671-9197 or by email at dlay(&bbl-inc.com. <br /> Sincerely, <br /> �Q ,oFESS/ON, <br /> BLASLAND, BOUCK& LEE, INC. 4�4 ��p. FLET/' <br /> a U Cts <br /> S, 'ill ti•/ <br /> David W. Lay,C.P.G. Michael P Fleischne , <br /> Senior Geologist Principal Engineer <br /> DWL/lw <br /> Enclosures: <br /> 034603054.doc <br /> BLASLAND, BOUCK& LEE, INC. <br /> ARCADIS,),,,,,> <br />