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C C Vector Engineering, Inc. 143E Spring Hill Drive Grass Valley, CA 95945 Telephone: 530-272-2448 Fax: 530-272-8533 WELL NUMBER: - 12 Page 1 of 1 Project: LFG Monitoring Well Installation Remarks: Client: San Joaquin County Hole overdrilled to 75.5 ft. Location: North County Sanitary Landfill Placed 0.5 ft of gravel at bottom. 17720 East Harney Lane, Lodi, CA Deep probe placed at 75 ft, as designed. _ U) rn J aMaterial Description Well Diagram m SM SILTY SAND (SM) dark yellowish brown (10YR 4/6), dry to Cement moist, approximately 70 % fine-grained sand, 30 % fines 5 - at 2 ft - becomes cemented (hardpan) with gravel, light yellow 5 Bentonite brown (2.5Y 6/4), hard drilling - gradational contact at approximately 4 - 7 ft Gravel 10 _ SC - changes back to dark yellowish brown (10YR 4/6), dry to �\_mois_t,_7_0_%_fine-grained 10 filter pack sand, 30 % fines J 15 _ _ _ _ _ _ _ _ — — CLAYEY SAND (SC) dark brown (7.5YR 3/3), moist, very Bentonite dense, approximately 60 % fine-grained sand, 40 % fines 15 20 20 25 CL SANDY CLAY (CL) dark yellowish brown (10YR 4/4), moist, Gravel very stiff to hard, medium plasticity, approximately 40 % sand, filter pack 30 60 /o fines 30 35-- 5 40 40-- 40 Bentonite 45 45 - less sand (approximately 30 %) from 45 - 50 ft 50 50 - high dry strength 55 55-- 60-- - no cuttings produced from 60 - 75 ft gp Gravel filter pack 65 65 70 SC CLAYEY SAND (SC) dark red brown, moist, cemented, 70 fine-grained sand, very hard 5 75— Drilling Drilling Company: PC Exploration Date Started: 7/23/2009 Time Started: 12:30pm Drilling Method: Hollow Stem Auger Date Completed: 7/24/2009 Time Completed: 1:20pm Boring Diameter: 8 inch Elevation (ft): 108.818 Total Depth (ft): 75.5 Logged By: Pete Holland, CEG Groundwater Level: NFWE Sampling Method: Grab from cuttings