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a M <br /> w <br /> Clayton <br /> E`11RU\'kSE\1:4L <br /> _. C!)ASUf IhVTS <br /> All concentrations are in mg/kg(milligrams for kilogram, or parts per million) <br /> Although regulatory action levels are not set for oil and grease, whe:I <br /> concentrations exceed 100 parts per million (ppm) the RWQCB's <br /> Recommendations for the Evaluation and Investigation of USTs requires a <br /> soil/groundwater investigation. The concentrations of oil and grease found in the <br /> soil at 6 feet in MW-3 puts the site into the RWQCB's "Case I"category requiring <br /> a soil/groundwater investigation. This requirement is satisfied by the current study. <br /> The RWQCB devel,ped the 100 ppm level to help prioritize cases, not as a <br /> cleanup level. The level of cleanup is determined by assessing the potential for <br /> soil contamination to impact groundwater. <br /> Hydrocarbon oil and grease were detected in soil samples from MW-1 and MW-2, <br /> but are within acceptable levels as determined by the RWQCB. Clayton <br /> speculates that the oil and grease found in MW-1 and MW-2 may have come <br /> from oil-based sprays applied to the site for agricultural purposes. <br /> Organochlorine Pesticides and PCBs <br /> Pesticides and PCBs were below detection limits in all soil samples. <br /> 4.3 GROUNDWATER SAMPLE ANALYSES <br /> Groundwater samples were collected on April 6, 1990, in accordance with the <br /> sampling protocols in Appendix C. Table 3 summarizes analytical results and <br /> compares our findings to the California Department of Health Services (DHS) <br /> action levels. Table 3 reports only detected compounds. All other compounds , <br /> analyzed were below analytical detection limits (Appendix F). <br /> Lf.A Metltad 802 1V1�1V la <br /> far <br /> �Acttort�v�1s <br /> -- EAh ]benzene 0.3 620 <br /> Xylenes 3.0 <br /> 680 <br /> I~l'A lVlethad €l15 <br /> • <br /> fat• <br /> Total Petroleum 130 N/A <br /> -Hydrocarbons as - <br /> -- _ Gasoline <br /> All concentrations are in ugjL,(micrograms per liter, or parts per billion) <br /> Gasoline and BTEX <br /> Water samples from.MW-3 showed low levels of gasoline, ethylbenzene, and <br /> Xylene. The ethylbenzene and xylene are below California DHS action levels. <br /> Action levels are not defined for gasoline in groundwater; however, the <br /> concentration.of gasoline in MW-3 is very low. MW-1 and MW-2 slid not have <br /> detectable concentrations of gasoline or BTEX in the water. <br /> -5- <br />