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t _. Mr.John Johnson <br /> ' - Project 113-26-M,August 24,1993 <br /> :,• - <br /> ' 'Page 3 <br /> -Drums with purge and wash water from the first 2 quarters were removed on <br /> .August 3, 1993. The liquid was taken to'Gibson Pilot Plant in Redwood City by <br /> 'Erickson,.Inc. of Richmond, using a hazardous waste manifest. Drums were'retained <br />[ by Parker Environmental as future groundwater purge and wash water containers: <br /> The samples were analyzed for TPH-gasoline,.and BTEX using EPA Methods_ 8015. . <br /> and 8020, respectively. A copy of the laboratory report ort and Chain of Custody form; <br /> , <br /> are appended to this report. <br /> Table 2 Laboratory Analysis Results <br /> :.Cheaper Store # 37 <br /> ti l a East Grant Line Road, Tracy, California . <br /> Groundwater Samples Collected on August 9, 1993' :. <br /> Sample TPH-g Benzene Toluene Ethylbenzene Xylenes - <br /> ' MW-1. 240 ND<0.5 ND<0.5 ND<0.5 ND<0.5 : <br /> MW-2 ND<50 ND<0.5 . ,.ND<0.5 . ND<0.5 : ND<0.5 <br /> MW-3 ND<50. .' . . ND<0.5 ND<0.5 ND<0.5 ND<0.5 <br /> MW-4'.' 28,000 5,400 810 320 3,600 <br /> A TPH-g and BTEX are in parts per billion, or µg/L. ND Not Detected <br /> The sample results show-detectable amounts:of petroleum hydrocarbons and all <br /> k - constituents in MWA and detectable amounts of petroleum hydrocarbons .in MW- <br /> 1. There is a decrease in amounts in all wells except MW-1. from the last quarter. .. <br /> -The.Staie Water Quality .Control Board published the'L_ lIFT,-Field Manual (10/89 <br /> page 8), which lists Maximum -Contaminant Levels, or regulatory threshold for the <br /> substance. The substances are Benzene, Xylene and Eth lbenzene. Toluene has a <br /> Department of Health Services :Action Level. These are compared.with the MW-1 <br /> and MW-3 results below: <br /> Comparison of Sample Results With <br /> ' = : RWQCB Maximum Contaminant Levels (MCL) <br /> and DOHS Action Level (AL) <br /> ` SampleTPH-g Benzene Toluene Ethylbenzene Xylenes <br />{ w MW-1 ... 240. ND<0.5 'ND<0.5 ND<0.5 ;ND<0.5 - <br /> -MW-4 -28,000 ' 5,400 -810 320 3,600 <br /> MCL (RWQCB) NA 1.0 NA . 680.0 .1,750.0 <br /> AL (DOHS) N A NA 100.0 - 'N A - - NA <br /> x,.. TPH.and BTEX are in parts per billion or µg/L. NA = Not Applicable ; <br /> t' Parker Environmental Services, 190 East_ 7th- Street, Pittsburg, CA 94565-2317 <br /> t. Phone' (510) 439.1024 Fax (510) 439-2566 } <br />