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46 ClayiOn <br /> All concentran, � 'rte in mg/kg (iililligr ims for kilogram or parts p=r million) <br /> Although regulatory action levels are not set for oil ,inti gicase, whe a <br /> concentrations Cxcecd 100 parts per million (ppm) the RWQCB's <br /> Recommendat ons for the CVdlLlatton and Investi�a ton of US 1's recµirres ri <br /> soil/groundwater investig,1lion 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"cat--gory requir,ng <br /> a soil/groundwater investigation This requirement rs satisfied by tl,e current study <br /> The RWQCB developed the 1()() ppm level to help priorttiry„ cases, not as a <br /> cleanup level The level of cleanup is delcrmined by,assessing the potential for <br /> soil contarnination to impact groundwate- <br /> Hydrocarbon oil and grease were detected in soil Samples from MW-1 and MW-2, <br /> but are within acceptable levels as detennined ry 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 agrictiltural purposes <br /> Orizanoc.h10nne Pesiiudes and„PCBs <br /> Pesticides and PCBs were below detection limits in all soil samples <br /> 4.3 GROUNDWATER SAMPLE ANALYSES <br /> 1� Groundwater samples were collected on April 6, 1990, in accordance with the <br /> sampling protocols in Appendix C Table 3 summtarizes 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 /> DES Action Uveb <br /> Eth lbenzene 03 620 <br /> X lenes 30 680 <br /> rPA Wth, 4-8015 ” N <br /> Total Petroleum 130 N/A <br /> Hydrocarbons as <br /> Gasoline <br /> All concentrations are in ug/L (microgr,.ns per liter, or pans per billion) <br /> Gasoline and BTEX <br /> Water samples from MW-3 showed low levels of asoline, ethylbenzene, and <br /> xylene The ethylbenzene and xylene are below Calitornia 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 />