Minutes & Attachments - Marine Corps Base Camp Pendleton

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IR SITE 1116 PHASE I & II SIPhase II SI (October 2012) – Subsite 140008• <strong>Base</strong>d on historical and Phase I results, eight groundwatermonitoring wells (MW5, MW6, MW7A, MW7B, MW8A,MW8B, MW9, and MW10) were installed.• Two locations were dry (PMW-2 and PMW-3, located south of15 th Street) (boring refusal at granitic bedrock).• The borings indicate that soils are characterized by silts andsands underlain by sandstone and siltstone north of the streamchannel and granitic bd bedrock south of fthe stream channel.9• The stream channel is underlain by unconsolidated soils(undifferentiated titdweathered bedrock, alluvium and fill soils) andare more permeable than bedrock to either side.IR SITE 1116 PHASE I & II SIGroundwater Elevation Contours (Subsite 140008)StreamChannel10Topographyincreases south of15 th street (hill)
IR SITE 1116 PHASE I & II SIGroundwater TCE Concentrations (Subsite 140008)StreamChannelTopography11increases south of15 th street (hill)IR SITE 1116 PHASE I & II SIPhase II SI (October 2012) – Subsite 140008• Groundwater flow:• Inferred groundwater flow direction is towards the northeast.• Seems to follow the stream channel.• TCE concentrations:• Relatively high in the vicinity of the stream channel.• Reported TCE concentrations range from 0.34 μg/L (estimated value)(MW2) to 340 μg/L (MW10).• Reported PCE concentrations range from 0.2 μg/L (MW2) to 5.7μg/L (MW10).12
Page 4 and 5: Ms. Prowell announced that she will
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Page 19 and 20: Date: 1/17/13RTC ApprovedItem Docum
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Page 41 and 42: SOUTHWEST DIVISIONMCB Camp Pendleto
Page 43 and 44: I. Background InformationFormer UST
Page 45 and 46: II. Extent of Contamination -Recent
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Minutes & Attachments - Marine Corps Base Camp Pendleton

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