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Table 1 <br /> . PRIOR ANALYTICAL RESULTS <br /> THIEMANN'S SERVICE - MARCH 26 1991 <br /> SAMPLEPEDEBBEZNE OLU/kENE ETHYLBE XYLENES TP TOTALLEAD EADETug/kg u /k mg/kg mg/kg <br /> 1W @ 165' ND <br /> 240 880 10600 325 NO <br /> 1E @ 1450 "' ND ND 97000 110000 71 0000 6900 11 0 <br /> 2W @ 16 5' ND ND 2100 8300 63000 1200 ND <br /> 2E & 14 5' ND ND 220000 180000 1020000 10200 11 0 <br /> 3W @ 15 5' '"" ND NO ND ND ND ND NO <br /> 3E 12 15 5' NO ND 3900 8600 60600 660 12 0 <br /> Detection Limits 10 1 000 1000 1000 1 000 500 5 0 <br /> 100 100 100 100 50 <br /> a r 2550 <br /> 5 0 5 0 5 0 5 0 2 5 <br /> ug/kg - micrograms per kilogram <br /> mg/kg - miligrams per kilogram <br /> The analytical results Indicated high concentrations of TPHg ranging from 325 mg/kg <br /> (milligrams per kilograms (ppm)) to 10200 mg/kg Toluene, ethylbenzene, and xylenes <br /> • were also detected In high concentrations ranging as follows 240 ug/kg to 220,000 <br /> ug/kg - toluene, 880 ug/kg to 180,000 ug/kg - ethylbenzene, and 10,600 ug/kg to <br /> 1 ,020,000 ug/kg - xylenes Benzene and EDB were non-detect In all samples Total <br /> lead was detected In three (3) samples (1 E [rD 14 5', 2E g 14 5', and 3Eca) 15 5') and <br /> represents background concentrations Sample 3W a� 15 5' , collected on the west <br /> side of tank #3 was non-detect for all analyses The petroleum hydrocarbon <br /> concentrations, as reported from the samples collected beneath the east and west <br /> sides of tank 1 and tank 2 and the east side of tank 3, are In excess of State and <br /> County Guidelines. <br /> Based on these results, additional site characterization was requested by the San <br /> Joaquin County Environmental Health Department (County) A letter was Issued by <br /> the County stating that the vertical and lateral extent of contaminants beneath the <br /> underground storage tanks must be fully assessed before final closure can be Issued <br /> Crisp Construction contracted with AquaGeosclences, Inc to prepare a workplan and <br /> implement the following site characterization study <br /> 3 0 SCOPE OF WORK <br /> On July 28 and 29, 1993, AGI conducted an Investigation Into the nature and extent of <br /> the hydrocarbon contamination at the site The objective of this work was to define the <br /> . 4of17 <br />