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T <br /> Quik Stop Market 1\70. 132 <br /> Project No.349132-31 September 19, 1990 <br /> Page 5 <br /> well MW-4 showed lower levels of benzene at 1.0 ppb,ethyl benzene.at 2.7 q b,and total <br /> xylenes at 5.3 ppb. P <br /> f s DISCUSSION <br /> t All borings were located near the underground fuel tanks(Figure 2). Soil andgroundwater <br /> samples were analyzed for TPI{G and BTEX. A significant concentration of hydrocarbons <br /> r were found in the soil samples from boring B-3 at 16 feet. Groundwater samples from two <br /> monitoring wells showed concentration of TPHG and benzene. <br /> r The California Department of Health Services(DHS)has set limits for contamination levels <br /> r4 in water. The maximum amount of contaminant allowable in drinking water based solely <br /> r i.I on health concerns is called "action level." The set limits that take into account not only <br /> r health,but also economic concerns are referred to as "maximum contaminant level"(MCL) <br /> a ° The DHS Publishes the MCL lis <br /> constituents analyzed have the following limits. <br /> t when available; otherwise actior, levels are used. The <br /> ► <br /> ".' Benzene v <br /> Toluene 1 ppb MCL ._ <br /> 100 ppb Action level \i <br /> Ethyl benzene 680 b <br /> Xylenes I PP MCL <br /> ,750 ppb MCL <br /> ppm=parts per billion <br /> Levels for total petroleum hydrocarbons as VR gasoline are site specific, thus no li <br /> 18 ` been set. mats Piave <br /> AU.soil samples were Feld checked for the <br /> rf ionization detector. Volatiles wedetected at samples Besence of -1 5 hydrocarbonsatile 1 0 B-1- using a photo <br /> 3-10 B-3-15 S-5-I5 A/fW-1.5 , B I-15,13-2-15,B- <br /> , MW-1-10, MW-1-I5MW-2-10, and MW-2-15. The <br /> majority of samples registered under 40 ppm. There were four sample which detected <br /> higher levels. Each was detected at 15 foot depth. The table below shows the sample <br /> number and their relative PID readings; <br /> i <br /> a - Sam le Number PIE(RPM) - — - <br /> . B-5-15 <br /> 171 <br /> B-3-15 291 . <br /> B-2-15 314 <br /> ► B-1-15 374 <br /> t l <br />