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4-2 <br /> Table 4-1. Analytical Results: Soil Samples <br /> Concentrations, milligrams per kilogram <br /> EPA EPA <br /> EPA Method 8020 Method 8015 Method 8010 <br /> Total fuel <br /> Well number Benzene Toluene xylene hydrocarbons Solvents <br /> Designated levela 0.7 100 620 -b - <br /> ` ATR-1A, (10.0-10.5 ft) 0.04 0.05 0.07 <10 NDc I <br /> ATR-2A (6.0-6.5. ft) ," <0.01 <0.01 <0.01 <10 ND <br /> ATR-2B (10.0-10.5 ft) 0.27 1.3 <0.01 710 ND <br /> ATR-3A (5.5-6.0 ft) 0.05 0.01 0.03 <10 ND <br /> ATR--3B (10.0-10.5 ft). 0.15 0.86 - 3:7 1,300 ND <br /> ATR-4A (5.0-5.5. ft) 0.33 0.01 0.05 <10 ND <br /> ATR-4B (10.5-11.0 ft) 1-2..21 2.5 74:8 i_1:,700- ND <br /> aDesignated level in a solid for the protection of.groundwater quality <br /> recommended by the,Regional Board, September 1986. <br /> bNo standard is established for total fuel hydrocarbons. <br /> CNondetectable constituents. <br /> Table -4-2. Analytical Results: GroundwaterSamples <br /> Concentrations, micrograms per "liter <br /> Item Action level ATR-1 ATR-2 ATR-3 ATR-4 <br /> EPA Method 602 __ <br /> Benzene 0.7a <0.5 <0.5 ;2 ,30Q X3;000 <br /> Toluene 100a <0.5 0.6 X1801 ,200 y. <br /> Xylene 620a . 23 <0.5 2,.300) 6501 <br /> Dead 0.05b 0.0240 0_:180 &.lOC' i0.040c <br /> EPA Method 8015 <br /> Total petroleum fuel <br /> hydrocarbons -d <1.0c <1.0c 17c 21c <br /> EPA Method 601 <br /> 1,2-Aichloroethane 5e 1.6 w5.9x R20 <10 <br /> a. <br /> 1,47Dichlorobenzene 7.50e 0.5 <0.5 <0,'5 <10 <br /> Bromodichloromethane 1000 2.3 <0.5 <0.5 <10 <br /> Chloroform 100e 5.0 <0.5 <5.0 <10 <br /> %inkin water action levels recommended b DHS ,Januar 1987. <br /> 9 Y �, Y <br /> bRegional Board primary drinking water.-standard (MCG) for lead, <br /> 0.05 milligrams/liter, September 1986. <br /> OResults in milligrams/liter. <br />_ dNo standard established for total fuel hydrocarbons.. <br /> eRegional Board primary drinking water standard- (MCL), September 1986. <br /> BROWN AND CALDWELL C CONSULTING ENGINEERS <br />