Minutes & Attachments - Marine Corps Base Camp Pendleton

IR SITE 1116 PHASE I & II SIPhase II SI (October 2012) – Subsite 140008• Based 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)