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Vector Engineering, Inc. <br />143E Spring Hill Drive WELL SG -103 <br />Grass Valley, CA 95945 Page 1 of 2 <br />Telephone: 530-272-2448 <br />Fax: 530-272-8533 <br />Project: LFG Monitoring Well Installation <br />Remarks: <br />Client: San Joaquin County <br />Hollow stem auger rig encountered refusal at 13 ft. <br />Location: Foothill Sanitary Landfill <br />Well completed with air rotary rig. <br />6484 North Waverly Road, Linden, CA <br />rn <br />Q <br />Material Description <br />Well Diagram <br />o� <br />co <br />C� <br />SM/GM <br />° ° o <br />SILTY SAND AND GRAVEL with COBBLES (SM/GK) <br />Cement <br />brown, moist, approximately 30 % fines, 30 % sand, 30 % <br />5 <br />gravel, 10 % cobbles (up to 8 in., well-rounded, granitic and <br />5 Bentonite <br />° <br />° e° <br />sedimentary derived) <br />10 <br />0 <br />Gravel <br />10 <br />° <br />filter pack <br />° °° <br />15 <br />CL <br />SANDY LEAN CLAY (CL) dark yellowish brown (10YR 3/4), <br />Bentonite <br />moist, medium plasticity, approximately 50 % fines, 50 % fine- <br />15 <br />to medium -grained sand, < 5% gravel and cobbles <br />`------------------ <br />20 <br />GP -GM <br />04 ° <br />_ _ _ _ <br />— __ --- <br />POORLY GRADED GRAVEL WITH SILT AND SAND <br />20 <br />o <br />(GP -GM), mostly broken cobbles, gravel is subrounded, <br />O <br />approximately 10 % low plastic fines, 30 % fine- to <br />25 <br />° <br />coarse-grained sand <br />25 <br />0 <br />O <br />30------ <br />ML <br />° °0 <br />— — — <br />SANDY SILT (ML) brown (10YR 4/3), moist, approximately <br />30 Gravel <br />30 % fine- to coarse-grained sand, 70 % low plastic fines <br />filter pack <br />35 <br />35 <br />40 <br />40 <br />- some claystone pieces <br />45 <br />45 <br />Bentonite <br />50 <br />-----------------------------------50 <br />SP <br />POORLY GRADED SAND (SP) moist, fine- to <br />medium -grained sand, < 5 % low plastic fines, some weak <br />55 <br />cementation <br />55 <br />60 <br />60 <br />65 <br />SM <br />------------------------------------ <br />SILTY SAND (SM) dark yellowish brown (10YR 4/4), moist <br />65 <br />approximately 30 %low plasticity fines, 70 %fine- to <br />medium -grained sand (black pieces), some cemented sand <br />70 <br />(sandstone) <br />70 <br />- at 70ft: approximately 40 % fines, 60 % fine-grained sand--- <br />75 <br />SP -SM :::.::.::..' <br />POORLY GRADED SAND WITH SILT (SP-SK)moist, <br />Gravel <br />75 filter pack <br />approximately 10% low plasticity fines, 90 % fine- to <br />_ <br />SM <br />CO-_gr_ai_ne_d_san_d ("black sand") <br />80 <br />_ _ _ _ _ _ _ _ _ _ <br />SILTY SAND (SM) dark yellowish brown (10YR 4/4), moist, <br />80 <br />approximately 40 % low plastic fines, 60 % fine- to <br />.:.. <br />medium -grained sand <br />Drilling Company: PC Exploration/Westex Date Started: 7/29/2009 Time Started: 12:20pm <br />Drilling Method: HSA/Air Rotary Date Completed: 8/7/2009 Time Completed: 1:35pm <br />Boring Diameter: 8-5/8 in Elevation (ft): 254.86 Total Depth (ft): 100 <br />Logged By: Kristin Sample, PE Groundwater Level: NFWE <br />Sampling Method: Grab from cuttings <br />