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- Report-Sail and Groundwater Investigation } <br /> Gateway Project,City of Stockton <br /> " April 10,2000 <br /> page-9- <br /> sample collected from GP1. MTBE-and TEPH quantifed as diesel, kerosene and motor oil were not <br /> detected at or above.thi laboratory reported detection limits in any of the ground water.samples. The <br /> laboratory. reported. detection. limits for. these constituents were raised for the grqundwater sample <br /> _ <br /> collected from GPI, however, because 1of-the presence of gasoline constituents in the sample. The <br /> a_ <br /> laboratory analytical results of--the groundwater samples-collected from the Ge''oprobe borings '`are <br /> summarized in Table 2,below. The laboratory analytical reports are included.in A endix C. <br /> TABLE 2 q <br /> SUMMARY OF GROUNDWATER SAMPLE LABORATORY ANALYTICAL RESULTS <br /> T E X TPH-G MTBE iTEPH <br /> Detection Limits—>' 0.3 µg11 -0.3µg/1 03µg11 0.6µg11 0.05 mg/[ 1.0µg11 Q.QS—0.5 mg/1 <br /> Sample ID - . .- <br /> 2895-GPI,-3130100 7 4 _ 23 994.8 NDS ND* Z`� <br /> 2$95-GP2-3/30/00ND ND ND ND ND ND.: ND. <br /> 2895-GP4-3131100 ND ND .,_.. ND ND ND ND ND <br /> 2895-GP5-3/31/00 j ND ND - ND ND ND ND. ND,; [� <br /> Unit Conversions: Analytical: <br /> µg/V parts per billion(ppb) i B,T,E,X-benzene,toluene,ethyl benzene,and total xylenes. <br /> - — mg/l:parts per million(ppm) MTBE=methyl tertiary butyl ether. <br /> TPH-G=total petroleum hydrocarbons,quantified as gasoline. j <br /> TEPH=total extractable petroleum hydrocarbons,quantified as kerosene(K),motor oil <br /> (MO),and diesel fuel(D). <br /> - - " - ND-=not detected at or above the laboratory reported detection limit. <br /> ND*=not detected at or above a raised laboratory reported dete_c_tion limit. Please refer <br /> to laboratory reports for actual detection limits. <br /> 4. SUMMARY, CONCLUSIONS,AND RECOMMENDATIONS. <br /> 4.1 SUMMARY OF FINDINGS 77 = __ <br /> Five borings were advanced at-the siteonMarch 30.,and 31, 2000, using direct push technology <br /> (Geoprobe) to collect soil and groundwater samples. The purpose of the subsurface investigation was to <br /> evaluate the potential for petroleum hydrocarbon contamination in soil and/or groundwater related to two <br /> USTs formerly located at the site. Depending on soil and.groundwater conditions at each location; the <br /> borings-were advanced down to between-24 a"nd 32 feet:bgs. Soil samples were collected from each <br /> borin - enerall at .four-foot_intervals"and submitted-.to the analytical laborato' based on field <br /> g g Y yt -. laboratory:! <br /> observations. Groundwater was encountered and sampled at each of the five borings with one exception <br /> (GP3). _ <br /> CONDOR <br />