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C7 Vector Engineering, Inc. 143E Spring Hill Drive Grass Valley, CA 95945 Telephone: 530-272-2448 Fax: 530-272-8533 Project: LFG Monitoring Well Installation Remarks: Client: San Joaquin County Location: North County Sanitary Landfill 17720 East Harney Lane, Lodi, CA _ rn J j Q Material Description Well Diagram o W 0 SM : SILTY SILTY SAND (SM) reddish -brown (5YR 4/4), dry, Cement SC _fine-grained sand, approximately 70% sand, 30 _% clay 5 CLAYEY SAND (SC) hardpan light brown (7.5YR 6/4), 5 Bentonite cemented, very hard, drill produced a lot of steam when drilling Gravel 1O__10 filter pack SM SILTY SAND (SM) dark yellowish brown (10YR 4/4), moist, approximately 60 % sand, 40 % fines, medium cohesion, low Bentonite 15 dry strength 1----------------------------------5 20 CL SANDY CLAY (CL) dark yellowish brown (10YR 3/4) moist, 20 :, medium to high plasticity, approximately 30 % sand, 70 % fines 25 25 :. Gravel Sc __ _____ __ CLAYEY SAND (SC) brown (10YR 4/3), verymoist, medium filter pack 30 dense (softer, faster drilling than previous soils), approximately 30-- 60 % sand, 40 % fines 35 35 40 40 Bentonite 45-- 5 45- 4550 50-- 50 SM SILTY SAND (SM) olive brown (2.5YR 4/3) very moist 55 fine-grained sand, approximately 70 % sand, 30 % fines 55 ' 60 60 Gravel filter pack 65 CL SANDY CLAY (CL) dark yellowish brown (10YR 4/4), moist, 65 medium plasticity, approximately 40 % sand, 60 % fines 70 Z5 70 Z5 Drilling Company: PC Exploration Date Started: 7/27/2009 Time Started: 8:10am Drilling Method: Hollow Stem Auger Date Completed: 7/27/2009 Time Completed: 3:00pm Boring Diameter: 8 inch Elevation (ft): 108.763 Total Depth (ft): 75 Logged By: Pete Holland, CEG Groundwater Level: NFWE Sampling Method: Grab from cuttings