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17W006_PDI Site Access Info (to Liberty)_020218 John Cressaty, Easement Coordinator Liberty Utilities 933 Eloise Avenue, South Lake Tahoe, CA 96150 RE: South Y Feasibility Study Pre Design Investigation (17W006); Site Access Information Dear John, The South Tahoe Public Utility District (District) is planning to conduct a groundwater investigation in the South “Y” Area. The purpose of this investigation is to collect subsurface data that would be used for the engineering design of extraction wells to remove tetrachloroethylene (PCE) contamination from groundwater. As part of the planning for this investigation the District has identified the City of South Lake Tahoe (CSLT) property (APN 023- 30-109) at 953 Eloise Avenue as an optimal location for siting a Test Well. Liberty Utilities (APN 023-30-111; 933 Eloise Avenue General Manager Richard H. Solbrig Directors Chris Cefalu James R. Jones Randy Vogelgesang Kelly Sheehan Duane Wallace APN 023-30-109 APN 023-30-111 Maximum Work Site Area (proposed) John Cressaty, Liberty Utilities February 2, 2018 Site Access Information 17W006 The proposed work site for the test well drilling program would encompass an area of approximately 5,500 sf (70’x 77’) on the Liberty property (APN 023-30-111); and 4,000 sf (57’x77’) on the CSLT property shown in red shading above. The drilling and testing equipment, support vehicles, materials and supplies would be set-up on the paved area of the Liberty property. The Test Well will be located on the CSLT property. 500-bbl Frac Tanks for the temporary containment of waste water will likely be located in the north shoulder of the road right of way on the CSLT property; or on the land north of the proposed work site on the bank of the retention basin (shown in purple shading above, about 20’ x 130’) which straddles the property line. The site needs will vary during the various phases of drilling, well development, and aquifer testing and we can work with you to minimize site access impacts to Liberty Utilities. Equipment Drilling: A LS 250 MiniSonic™ Rig will be used for the drilling program. The MiniSonic™ Rig is a compact, low ground pressure drilling rig designed for drilling in environmentally sensitive areas. Technical information for the drilling equipment is attached. In addition to the drill rig and guide rig, an area for equipment and casing as well as storage bins for waste; a small water treatment unit and ancillary equipment will be needed. All drilling and support equipment will be located within the designated Work Site Area. Well Development and Aquifer Testing: After the drilling is complete, the drill rig and equipment will be removed, and replaced with a truck-mounted Smeal 5T or 6T pump hoist rig; tanks for temporary containment of waste water and ancillary equipment. The Well Development and Aquifer Testing equipment will also be located within the designated Work Site Area. Schedule The drilling and testing program is anticipated to be completed within 30 days, including Contractor mobilization/demobilization, on and off the work site. The project is intended to be completed on or before June 1st, 2018. Please contact me to schedule a convenient time to meet and discuss this matter. My contact information is provided below. Ivo Bergsohn, PG, CHG Hydrogeologist South Tahoe Public Utility District (530)543-6204 ibergsohn@stpud.dst.ca.us cc: R. Solbrig File 6 General Performance Rating Metric U.S. Drilling Depth** Depths based on normal drilling conditions. Varying ground conditions and drilling styles may vary results. 4.75 in (121 mm)6 in (152 mm)7 in (178 mm)8 in (203mm)9.25 in (235 mm)10.5 in (267 mm)12 in (305 mm) 78 m61 m52 m45 m39m34 m30 m 255 ft200 ft170 ft150 ft130 ft110 ft100 ft Max Drilling Diameter 305 mm 12 in Pull Back 66 kN 14,800 lbf Down Force 24 kN 5,300 lbf Max Casing Length 3 m 10 ft Sonic Head Metric U.S. Drill Head Type MiniSonic Vibration Motors Fix displacement piston motors Frequency range 0-75 Hz Output Force @ 75 Hz 182 kN 41,000 lbs Maximum Torque 2,400 Nm 1,700 ft/lb Rotational Speed 0 - 80 RPM Prime Mover Metric U.S. Engine - Standard Unit Cummins QSB, 4 cylinder, turbo charged, air-cooled diesel engine Displacement 4.5 L 272 in3 Power (maximum) at 119 kW 160 hp Emissions Stage IIIb tier 4 (i) Fuel Tank Capacity 193 L 51 gal Drill Mast System Metric U.S. Drilling Angle 45° off horizontal to 90° vertical down Rod Pull 3 m 10 ft Head Rotation 0 - 28 Degrees LS™250 MINISONIC™ TECHNICAL INFORMATION Copyright © 2015 Boart Longyear. All Rights Reserved. 5 7 Main Winch Metric U.S. Line Pull Bare Drum 11,000 N 2,472 lb Full Drum 9,000 N 2,023 lb Rope speed Bare Drum 27.5 m/min 90 ft/min Full Drum 34 m/min 111.5 ft/min Main line winch cable dia.8 mm 5/16 in Rope length 65 m 213 ft Foot Clamp/Breakout System Metric U.S. Rod Clamps 2 (dual cylinders - top and bottom) Max clamping diameter (clamp/breakout tool)305 mm 12 in Clamping force 129 kN 29,000 lb Max breaking torque 23 kNm 17,000 lbft Max breaking angle 20 degrees Undercarriage Metric U.S. Crawler - Standard Unit Track One Max speed 6.25 km/h 3.9 m/h Track width 600 mm 24 in Ground pressure .28 bar 4.0 PSI Water Pump Metric U.S. Type FMC E0413 Max flow 80 lpm 21.1 gpm Max pressure 41 bar 595 PSI 6 Grout Pump Metric U.S. Type SPX40 Hose Pump Max flow 160 lpm 42 gpm Max pressure 16 bar 232 PSI 8 Additional Options Welder Generator Metric U.S. Type Hydraulic driven Getec Generator Voltage 120 V Frequency 60 Hz Power 4,000 W 5.36 hp Welder Current 200 A Voltage 12 - 30 V Duty cycle 68% Welder Generator - European Version - Hydraulic Driven Dynaset Metric U.S. Generator Voltage 230 V / 400 V Frequency 50 Hz Power 230 V 3,500 W 4.7 hp Power 400 V 6,500 W 8.7 hp Welder Current 180 A Voltage 22 - 32 V Duty cycle @180 A 50% Duty cycle @110 A 100% Autohammer (Standard Penetration Test) Metric U.S. Impact rate 1 - 30 blows/minute Hammer size 63,5 kg 140 lb Hammer drop height 762 mm 30 in Max pressure 124 bar 1800 PSI Max flow 60 lpm 15.9 gpm All up weight 226 kg 498 lb Certified hammer efficiency 64 - 72%64 - 72% LS™250 MINISONIC™ TECHNICAL INFORMATION Copyright © 2015 Boart Longyear. All Rights Reserved. 7 9Copyright © 2015 Boart Longyear. All Rights Reserved. 8 Measurements Mast Up - Drilling Position Wet Weight = 11,500 kg (25,300 lbs)Consisting of:• Undercarriage• Hydraulic module• Main winch• Hydraulic mast raising• Sonic head type: Mini• Wiggle frame• Hydraulic leveling jacks / outriggers• Foot clamps• Grout pump• Compressor• Hydraulic mud pump Mast Down - Travel Position 2.2 m (7 ft 3 in) 2.8 m (9 ft 2 in) Wert Wert Ra12.5 WertWertAB B C B A B A A A C A D B A A D A B A A A B A A A A A A A A ACB AA1 0,20,2 0,2 Ra3.2 2,52,5 AAA A A BC A 64 64 1,67.1 m (23 ft 3 in) Wert Wert Ra12.5 WertWert AB B C B A B A A A C A D B A A D A B A A A B A A A A A A A A ACB AA1 0,20,2 0,2 Ra3.22,52,5 AAA A A BC A 64 64 1,6Wert Wert Ra12.5 A B B C B A B A A A C A DB A A A 1 0,8 A 0,20,2 0,2 AA A A A BC 64 64 1,6 7.2 m (23 ft 7 in) 5.6 m (18 ft 5 in) Water Pump Metric U.S. Type Triplex FMC LO918 with Ball Valves Max flow 108 lpm 28.7 gpm Max pressure 48 bar 700 PSI