Laserfiche WebLink
0 0 <br /> RESULTS OF DECEMBER 1996 DRILLING,STOCKTON FORMER MGP SITE <br /> Sample SB96-3 15 FT SB96-5 14 FT SB96-12 25 FT SB96-12 35 FT <br /> Analysis SOIL DI SOIL TND <br /> DI SOIL DI <br /> WET/ WET/ WET/ <br /> TCLP TCLP TCLP <br /> Total PNAs 1.4 ND 2,838 .034 19.86 .021 <br /> (mg/kg),(mg/1) <br /> Total 1.4 ND 282 ND 2.77 ND <br /> Carcinogenic <br /> PNAs <br /> (mg/kg),(mg/1) <br /> Total BTEX ND ND 18.9 1.63 ND <br /> (mg/kg), (mg/1) <br /> TPH-gas 9.0 180 37 10 28 1.5 14 0.31 <br /> (mg/kg), (mg/1) <br /> TPH-diesel1800 2.8 ND 5.1 460 ND 78 ND <br /> (mg/kg), (mg/1) <br /> 3. Investigate source of diesel near MW-22R (Area II) <br /> Soil borings SB96-6 through SB96-11 were drilled around MW-22R(as shown in Figures 1 <br /> and 3) to investigate the diesel found in the Hydropunch groundwater sample collected <br /> from MW-22R. SB96-9 was drilled upgradient of the former auto repair shop and SB96-6 <br /> through SB96-8 were drilled within the footprint of the former auto repair facility and <br /> upgradient of MW-22R. It was decided in the field that two additional borings, SB96-10 and <br /> SB96-11 would be drilled downgradient from the MW-22R location since there were no <br /> visual detections during the drilling of SB96-6 through S1396-9. <br /> Soil samples were collected every 5 feet between 6 feet and 35 feet bgs in all of the borings <br /> and an additional sample was collected at 42 feet bgs from S1396-8. Zone A Hydropunch' <br /> groundwater samples were collected from SB96-8 and SB96-9 at 48 feet and 40 feet bgs, <br /> respectively. The soil and groundwater samples were analyzed for PNAs,BTEX,TPH- <br /> gasoline,TPH-diesel,and VOCs (including chlorinated solvents). Tables 1 and 2 summarize <br /> the soil analytical results and Table . <br /> All soil samples collected from these borings were nondetect for BTEX,TPH-gasoline,TPH- <br /> diesel,and VOCs. PNAs were only detected in soil samples from S1396-9,S1396-10,and S1396- <br /> 11 at concentrations less than 0.25 mg/kg (with only acenaphthene and acenaphthalene <br /> being detected). The two groundwater samples were nondetect for PNAs,BTEX,VOCs,and <br /> TPH-gasoline. TPH-diesel was not detected in SB96-8 and was detected just above the <br /> detection limit in upgradient boring SB96-9 at 0.57 mg/L. <br /> These results indicate that there is not a source of diesel in Area II of PG&E property. Furthermore <br /> there does not appear to be a source of gas plant residues or chlorinated solvents in this area. <br /> SFO/96RESLTS.DOC 4 <br />