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2651 S. Airport Way, Stockton, California
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<br />• Boring H10, advanced in the center of the former excavation for the two removed
<br />gasoline USTs, will have soil samples collected at 30, 35, 40, 45, 50 ' and 55 feet
<br />bgs for analysis.
<br />• Borings B13, advanced to total depth of 55 feet bgs approximately 30 feet south
<br />of proposed boring H12 and cross gradient to the source area, will have soil
<br />samples collected at 5, 15, 30, 40, 45, 50, and 55 feet bgs for analysis. ' .
<br />• Boring B 14,advanced to total depth of 55 feet bgs approximately 45 feet northeast
<br />of monitoring well MW -11, and boring B15, advanced to total depth of 55 feet
<br />bgs approximately 45 feet east/southeast of MW -11, both down gradient of the
<br />source area, willhave soil samples collected at 5, 15, 30, 40, 45, 50„and 55 feet
<br />bgs for analysis.
<br />Groundwater samples will be collected at approximately 50 feet bgs at bore .holes 117,
<br />H8, 119, H10, HIT, H12, H13, H14, and H15 for analysis. Soil and groundwater samples
<br />will be analyzed for total petroleum hydrocarbons as gasoline (TPH-g); total extractable
<br />petroleum hydrocarbons as diesel (TEPH-d) and TEPH as motor oil (TEPH-mo);
<br />benzene, toluene, ethylbenzene, and total xylenes (BTEX); methyl tertiary -butyl ether
<br />(MTBE), ethyl tertiary -butyl ether (ETBE), di -isopropyl ether (DIPE), tertiary amyl -
<br />methyl ether (TAME), tertiary butyl alcohol (TBA), and 1,2-dichloroethane (1,2 -DCA).
<br />Please report results both with and without silica gel cleanup for all samples receiving
<br />silica gel cleanup and report groundwater results for 1,2 -DCA at 0.5 micrograms per liter
<br />(µg/L), if possible.
<br />If you have any questions regarding this letter, please contact Vicki McCartney at (209)
<br />468-3456 or by electronic mail at vmccartney@sjcehd.com.
<br />Donna Heran, REHS, Director
<br />Environmental Health Department
<br />Victoria L. McCartney, Senior REHS Nuel C. Henderson, Jr., PG
<br />Unit TV -Site Mitigation Unit N- Site Mitigation
<br />g g
<br />c: Paul Anderson -PSC
<br />Thomas Neely, PG - ETIC
<br />James L.L. Barton, PG - CVRWQCB
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