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LPhase H Environmental Site Assessment Report-Executive Summary
<br /> 1025 East Main Street,Stockton,San Joaquin County,California
<br /> Page 10
<br /> L 5.2 GROUNDWATER SAMPLES
<br /> 5.2.1 VOCs and SVOCs
<br /> LLow concentrations of chloroform were detected in samples B-1, B-2, B-3, and B-4 at 0.90, 5.5, 7.7, and
<br /> 3.4 micrograms per liter (µg/Q, respectively; below the EPA and California Maximum Contaminant
<br /> Level (MCL)of 80 µg/L. All other VOCs and SVOCs were not detected at or above laboratory reporting
<br /> L limits in any of the four samples.
<br /> 5.2.2 Petroleum Hydrocarbons(TPH-G,-D,-MO)
<br /> V The laboratory analytical results for the groundwater samples are summarized in Figure 7, Appendix A,
<br /> and Table 6, below. All four groundwater samples had a laboratory note of"liquid sample that contains
<br /> greater than -- 1 vol. % sediment'. TPH-G was not detected at or above laboratory reporting limits of 50
<br /> ` µg/L in any of the four groundwater samples (13-1 through B-4). TPH-D was detected in groundwater
<br /> samples B-1, B-2, B-3, and B-4 at 99, 420, 190, and 1,400 µg/L, respectively. The laboratory described
<br /> the analysis of samples B-1 and B-3 as,"diesel range compounds are significant-no recognizable pattern;
<br /> jr one to a few isolated peaks present". Sample B-2 had the following laboratory notes: "oil range
<br /> compounds are significant; diesel range compounds are significant-no recognizable pattern". Sample B-4
<br /> had the following laboratory notes: "oil range compounds are significant; diesel range compounds are
<br /> Vsignificant-no recognizable pattern; one to a few isolated peaks present". TPH-MO was not detected in
<br /> groundwater samples B-1 or B-3 at or above 250 µg/L. TPH-MO was detected in groundwater samples
<br /> B-2 and B-4 at 2,100 and 1,500 µg/L,respectively.
<br /> Table 6—Groundwater Results—VOCs,SVOCs,TPH-G,-D,-MO
<br /> 6. Volatile Organic Semi-Volatile
<br /> Constituent: Organic TPH-G TPH-D TPH-MO
<br /> Compounds Compounds
<br /> Anal 'cal Method: 8260B 8270C 8015Cm 8015Cm 8015Cm
<br /> Units:
<br /> EPA/CA MCL: Chloroform 80
<br /> L Sample Date Sampled
<br /> H)
<br /> L B-1 12/11/2007 [Chloroform 0.901 ND < 50,i 99,b, f,i <250
<br /> all others ND
<br /> B-2 12/11/2007 [Chloroform 5.51 ND <50,i 420,g,b,i 2,100
<br /> all others ND
<br /> LB-3 12/12/2007 [Chloroform 7.7] ND <50,i 190,b,f,i <250
<br /> all others ND
<br /> L B-4 12/12/2007 [Chloroform 3.41 ND <50,i 1,400, g,b,f,i 1,500
<br /> all others ND
<br /> Notes: Bold values indicate constituent was detected at or above laboratory reporting limits.
<br /> ND=not detected at or above laboratory detection limits
<br /> EPA/CA MCL=Environmental Protection Agency/California EPA maximum contaminant level for groundwater
<br /> L µg/L= micrograms per liter=parts per billion(ppb)
<br /> b)diesel range compounds are significant;no recognizable pattern.
<br /> J)one to a few isolated peaks present.
<br /> g)oil range compounds are significant.
<br /> `° i)liquid sample that contains greater than—t vol.%sediment.
<br /> i� CONDOR
<br /> V
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