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HomeMy WebLinkAboutRS_Geotechnical_Report_Geothermal_Test_Loops_240830_v1.pdf Kirkland | Tacoma | Mount Vernon 425-827-7701 | www.aesgeo.com August 30, 2024 Project No. 20210251E003 Renton School District No. 403 7812 South 124th Street Seattle, Washington 98178 Attention: Mike Cato, P.E. Subject: Thermal Conductivity Borings and Test Loop Installation Hazen High School Modernization 1101 Hoquiam Avenue NE Renton, Washington Reference: Subsurface Exploration, Geologic Hazard, and Geotechnical Engineering Report Hazen High School Modernization 1101 Hoquiam Avenue NE Renton, Washington Dated: August 26, 2024 Dear Mike Cato: Associated Earth Sciences, Inc. (AESI) is pleased to present this letter summarizing our field observations of the drilling conditions during advancement of two vertical boreholes and installation of two geothermal test loops at the Hazen High School campus in Renton, Washington. The site location is shown on the “Vicinity Map,” Figure 1. Also included is a review of selected references and our conclusions and recommendations with respect to the drilling conditions that will likely be encountered during installation of the production loop field. We are familiar with the site through completion of our above-referenced geotechnical engineering study related to the high school modernization project as well as our previous work onsite. This letter was prepared in accordance with local geotechnical engineering standards at the time it was completed. No other warranty, express or implied, is made. GEOTHERMAL LOOP DRILLING AND TESTING As part of our scope of work for this study, AESI observed the installation of two geothermal test loops designated as GTL-1 and GTL-2. The vertical boreholes were drilled, and test loops were installed by Geo Loop Tec Company. We understand that thermal conductivity testing analysis Hazen High School Modernization Thermal Conductivity Borings Renton, Washington and Test Loop Installation August 30, 2024 ASSOCIATED EARTH SCIENCES, INC. KAM/ld – 20210251E003-004 Page 2 and results were completed by others. This section summarizes our observations during drilling and test loop installation. The approximate locations of the test loops, along with previous explorations completed by AESI at the site, are depicted on the “Existing Site and Exploration Plan,” Figure 2. The general locations of the test loops were selected and laid out by the design team. Interpretive logs of the subsurface conditions encountered during drilling of the vertical boreholes are included in Appendix A. The test loops were constructed such that they may be incorporated into a permanent loop field as part of the finished system if desired. If the existing test loops are not to be used as part of a permanent loop field, we recommend that the test loops be decommissioned in accordance with Washington Administrative Code (WAC) Section 173-160. We recommend that the existing test loops be shown on the project plans. If the test loops will be decommissioned, we recommend that the decommissioning be included as part of the base bid demolition work in the project contract. The production loop field driller should be able to decommission the existing loops without a separate mobilization charge. Drilling Equipment Drilling of the test loop boreholes started on July 17, 2024 and were completed on July 25, 2024. GTL-1 took 4 days to complete, primarily due to equipment downtime and maintenance, and GTL-2 took 2 days to complete. Information related to drilling advancement rates is provided in the following section and noted on the borehole logs in Appendix A. The test loop boreholes were drilled by Geo Loop Tec Company using a track-mounted Sonic SDC550-24 rotary drill rig. Both boreholes were approximately 6 inches in diameter and advanced with a tricone drill bit (GTL-1) or claw drill bit (GTL-2) connected to a string of drill rods approximately 4.5 inches in diameter. Casing was not used during drilling. Cuttings were continuously cleared from the borehole with drilling fluid (Baroid Quik-Gel® and water mixture) that was circulated down through the drill string, up through the annulus of the borehole, and into a pit dug at the ground surface. Drill fluid and any cuttings present in the pit were pumped to a nearby Mudslayer® 400M mud separator tank with an initial large-particle screen, and a submersed pump which recirculated mud from the bottom of the tank through a sand screen. Drilling fluid was then pumped from the mud separator tank back down through the drill string. The working volume of drilling fluid varied, but it was estimated to be a maximum of 500 gallons. Drilling Methods/Production Rates Both test loop borings were advanced to a total depth of approximately 355 feet below the existing ground surface in 20-foot segments. After each 20-foot rod was advanced, the driller rapidly withdrew and re-advanced the drill string over the last 20 feet to clear any slough or remaining cuttings from the borehole. At the termination of drill advancement, the bit was placed Hazen High School Modernization Thermal Conductivity Borings Renton, Washington and Test Loop Installation August 30, 2024 ASSOCIATED EARTH SCIENCES, INC. KAM/ld – 20210251E003-004 Page 3 just above the bottom of the boring and drilling fluid was circulated for approximately 15 minutes to clear cuttings while the loop assembly and grout backfill were prepared. Notable losses in drilling mud occurred within gravelly zones, indicated by increased drill chatter and bouncing of the drill string; fluid loss details are noted on the borehole logs in Appendix A. The driller generally opted to add water to the mud separator tank when relatively minor fluid losses occurred, and added more bentonite when significant fluid losses occurred (typically greater than 30 percent loss). Drilling time to advance each 20-foot-long drill rod was noted, excluding time for attaching drill rods, flushing the borehole, and downtime for other tasks that required drilling progress to be stopped. Drill time for each 20-foot run ranged from about 5 to 39 minutes and averaged 22 and 16 minutes overall in GTL-1 and GTL-2, respectively. GTL-2 encountered less coarse-grained sediments overall and the claw bit was able to mobilize larger sediment grains. A summary of the production rates for each soil unit is included in Tables 1 and 2 below. Test Loop Construction The geothermal test loops were constructed with 1-inch-diameter Centennial CenFuse IPS SDR11 polyethylene flexible pipe with fused connectors at the base. The loop materials were delivered to the site on spools with total loop lengths of approximately 360 feet. The test loops were installed into the boreholes via a cylindrical steel weight (2 inches in diameter and about 20 feet long) attached to a cable and winch on the drill rig. Each loop was duct-taped to the steel weight, the loop was filled with water, then lowered down into the borehole. No substantial difficulties or obstructions were noted during installation. After the loops were extended to the bottom of the borehole, the ends were fitted with screwed-in plugs. Each loop was then encased in grout with the U-bend set at a depth of about 350 feet below existing grade. Grout was mixed onsite in a portable grout mixing plant. The grout mix consisted of 150 pounds of TGLite grout by GeoPro, Inc. and 32 pounds of PowerTec additive by GeoPro, Inc. Grout was batched and pumped into the borehole immediately after mixing, and additional batches were mixed as needed to grout the borehole to within about 3 feet below existing grade. Subsurface Soil and Drilling Conditions and Geologic Interpretation No soil sampling (such as split-spoon sampling) was conducted from the boreholes; periodic sampling of soil cuttings was conducted at both the ground surface pit and the mud separator sediment chute. Observed soil and drilling conditions for the borings are summarized in Tables 1 and 2 below. Detailed subsurface soil information and geologic interpretations are included on the borehole logs in Appendix A. Hazen High School Modernization Thermal Conductivity Borings Renton, Washington and Test Loop Installation August 30, 2024 ASSOCIATED EARTH SCIENCES, INC. KAM/ld – 20210251E003-004 Page 4 Based on AESI’s observations, the encountered soils can be broken down into five generalized stratigraphic units: Existing fill, Vashon lodgement till (Qvt), Vashon advance outwash (Qva), pre-Fraser fine-grained deposits (Qpff), and pre-Fraser coarse-grained deposits (Qpfc). Each unit is characterized by qualitative grain-size distribution and other geologic depositional indicators, drilling action, penetration rate, and degree of drilling fluid (bentonite mud) loss (if any). The summary descriptions provided in the tables below are based on the observed characteristics listed above and the recovered drill cuttings. The drill action terms “smooth, slight, moderate, and severe” are qualitative terms describing the action of the drill bit while the drill hole is advanced and generally is indicative of the presence/absence and size of rock (gravel through boulder size) encountered during drilling. Smooth drill action is typical in fine-grained materials while moderate to severe rocky drill action can be indicative of coarse gravel, cobbles, and boulders in the sediments being drilled. Table 1: Geothermal Test Loop (GTL-1) Drill Cuttings Geologic Unit Depth Interval (feet bgs) Summary Soil Description* Qualitative Drill Action Significant Mud Loss Drilling Rate (minutes per 20 feet) Fill 0 to 12 Brown, silty, sand, some gravel. Slight No ~9 Qvt/Qpff 12 to 23 Brown, silty, fine- to coarse-grained sand, variable high fine- to coarse-gravel, trace cobbles. Moderate No 12 to 16 Qva/Qpfc 23 to 84 Brown, fine- to coarse-grained sand and fine- to coarse-gravel, variable low silt, occasional cobbles. Significant mud loss around 50 to 80 feet associated with clean gravel interbed(s). Slight, with occasional Severe Yes 14 to 24 Qpff 84 to 236 Gray, interbedded silt and fine- to medium-grained sand. Increase in volcanic-provenance sands. Smooth to Slight No 26 to 32 Qpfc 236 to 305 Gray, interbedded fine- to coarse- grained sand and gravel, with variable cobble and silt contents. Majority of rock clasts are dark gray colored, volcanic provenance. Moderate to Severe Yes 19 to 23 305 to 355 Severe Yes 35 to 39 Notes: *Degree of gravel to boulder content estimated based on drill action and angularity of drill cuttings. bgs = below ground surface Qvt = Vashon lodgement till Qva = Vashon advance outwash Qpff = pre-Fraser fine-grained deposits Qpfc = pre-Fraser coarse-grained deposits Hazen High School Modernization Thermal Conductivity Borings Renton, Washington and Test Loop Installation August 30, 2024 ASSOCIATED EARTH SCIENCES, INC. KAM/ld – 20210251E003-004 Page 5 Table 2: Geothermal Test Loop (GTL-2) Drill Cuttings Geologic Unit Depth Interval (feet bgs) Summary Soil Description* Qualitative Drill Action Significant Mud Loss Drilling Rate (minutes per 20 feet) Fill 0 to 6 Brown, silt, some sand, trace gravel. Slight No ~10 Qvt/Qpff 6 to 68 Brown, sandy, silt, some gravel. Moderate No 18 to 39 Qpff 68 to 220 Gray, interbedded silt and fine- to medium-grained sand. Increase in volcanic-provenance sands. Slight, with occasional Severe No 11 to 37 Qpfc 220 to 310 Gray, interbedded fine- to coarse- grained sand and gravel, with variable cobble and silt contents. Majority of rock clasts are dark gray colored, volcanic provenance. Moderate to Severe Yes 9 to 15 310 to 355 Severe Yes 16 to 23 Notes: *Degree of gravel to boulder content estimated based on drill action and angularity of drill cuttings. bgs = below ground surface Qvt = Vashon lodgement till Qva = Vashon advance outwash Qpff = pre-Fraser fine-grained deposits Qpfc = pre-Fraser coarse-grained deposits Drilling Inferences We understand that the proposed location of a future loop field will be located within the natural turf playfields and track along the west side of the site. Our previous exploration borings adjacent to this portion of the site encountered a variable thickness of existing fill and a thin deposit of medium dense Vashon recessional outwash overlying fine-grained glacially consolidated soils. The glacially consolidated soils are typically resistant to caving; therefore, we do not anticipate that casing of the borehole will be required within these geologic units during production drilling of the loop field. Although the test loop borings did not require casing within the upper profile of existing fill, these surficial sediments and any potential near-surface Vashon recessional outwash sediments represent the interval where casing of the borehole may be required to control fluid loss and caving depending on the driller’s means and methods during production drilling. Based on our previous subsurface explorations and depending on the location of the geothermal loop, the thickness of the existing fill and Vashon recessional outwash may extend to about 25 feet below existing grade. The fine-grained component of the subsurface sediments gradually increased the suspended sediment load in the drilling fluid. Using the de-sander may help circulation pumps and hoses from becoming clogged with solids, resulting in more efficient drilling. The time needed to advance each 20-foot interval was recorded excluding time spent to attach new drill rods, re-mixing drilling mud, or performing any equipment maintenance. Test loop Hazen High School Modernization Thermal Conductivity Borings Renton, Washington and Test Loop Installation August 30, 2024 ASSOCIATED EARTH SCIENCES, INC. KAM/ld – 20210251E003-004 Page 6 boring GTL-1 was drilled with a tricone bit, encountered a sand and gravel zone from 23 to 84 feet as well as from 236 to 255 feet, and drill times for each 20-foot interval averaged 23 minutes ranging up to 29 minutes. Test loop boring GTL-2 was drilled with a claw bit, encountered sand and gravels between 220 to 355 feet, and drill times for each 20-foot interval averaged 18 minutes ranging up to 39 minutes. It should be noted that the geologic units interpreted at this site have been observed on other projects to contain zones of gravel, cobbles, or boulders that could potentially delay progress during production drilling of the loop field either by slow drilling progress or by fluid loss into the formation. Where encountered, such coarse deposits are often located above formation changes. We note that in GTL-1 between the upper pre-Fraser coarse-grained deposits and underlying pre-Fraser fine-grained deposits, a zone of gravel and occasional cobbles resulted in severe drill action and chatter from a depth of about 70 to 85 feet, or within deeper zones within the pre-Fraser coarse-grained deposit where severe drill action and chatter were encountered in GTL-1 from depths of 305 to 355 feet and in GTL-2 from depths of 310 to 355 feet. CLOSURE We appreciate the opportunity to be of continued service for this project. If you have any questions, please do not hesitate to call. Sincerely, ASSOCIATED EARTH SCIENCES, INC. Kirkland, Washington _______________________________ Kristen A. Marohl, L.G. Senior Staff Geologist ______________________________ Jennifer H. Saltonstall, L.G., L.Hg. G. Bradford Drew, P.E. Principal Geologist/Hydrogeologist Associate Engineer Attachments: Figure 1: Vicinity Map Figure 2: Existing Site and Exploration Plan Appendix: Exploration Logs (GTL-1 and GTL-2) G:\GIS_Projects\aaY2021\210251 Hazen HS\APRX\E003\20210251E003 F1 VM_HazenHS.aprx | 20210251E003 F1 VM_Hazen HS | 2024-01-24 | mtropCOUNTY LOCALE LOCATION PROJECT NO.DATE FIGURE 11/2420210251E003 HAZEN HIGH SCHOOL MODERNIZATION RENTON, WASHINGTON VICINITY MAP ESRI, USGS, NATIONAL GEOGRAPHIC,DELORME, NATURALVUE, I-CUBED, GEBCO:ARCGIS ONLINE BASEMAP. WADOT STATE ROUTES 24K (12/20). KING CO: PARCELS (4/23), ROADS (5/23). NOTE: LOCATION AND DISTANCES SHOWNARE APPROXIMATE. BLACK AND WHITEREPRODUCTION OF THIS COLOR ORIGINAL MAY REDUCE ITS EFFECTIVENESS AND LEAD TO INCORRECT INTERPRETATION. King County DUVALL AVE NEHOQUIAM AVE NENE 12TH ST NE 10TH STCHELAN AVE NE900 KING COUNTYRENTON NEWCAS T L E RENTONRENTON RENTON NEWCASTLENEWCASTLE 0 2,000 FEET ± SITE BLACK AND WHITE REPRODUCTION OF THIS COLOR ORIGINAL MAY REDUCE ITS EFFECTIVENESS AND LEAD TO INCORRECT INTERPRETATIO LOCATION AND DISTANCES SHOWN ARE APPROXIMATE.G:\GIS_Projects\aaY2021\210251 Hazen HS\APRX\E003\20210251E003 F2 ES_HazenHS.aprx | 20210251E003 F2 ES_HazenHS | 2024-08-19 | kbehmPROJECT NO.DATE FIGURE ± 28/2420210251E003 HAZEN HIGH SCHOOL MODERNIZATION RENTON, WASHINGTON EXISTING SITE AND EXPLORATION PLAN DATA SOURCES/REFERENCES: KING COUNTY: ROADS (5/23), PARCELS (4/23). EAGLEVIEW TECHNOLOGIES, INC.: AERIAL IMAGERY (2023). WA DNR LIDAR: KING_COUNTY_WEST_2021, ACQUIRED 4/21, 1.5' CELL SIZE. CONTOURS DERIVED FROM LIDAR. 0 150 FEET !H !H 460450440430420 470 460 450 480 470 46 0 450 450440470 470470 440440Hoquiam Ave NEDuvall Ave NEN E 1 0 t h S t NE 10th St NE 12th St N E 1 2 t h S t NE 11th St HAZEN HIGH SCHOOLEB-1 EB-1 EB-2 EB-3 EB-4 EB-5 EB-1 EB-2 EB-3 EB-4 EB-5 EB-6 EB-7 EB-8 EB-9 EB-10 EB-11 EB-1 EB-2 EB-3 EB-4 EB-5 EB-6 GTL-1 GTL-2 LEGEND SITE !H GEOTHERMAL TEST LOOP, 2024 EXPLORATION BORING, 2024 EXPLORATION BORING, 2022 EXPLORATION BORING, 2021 EXPLORATION BORING, 2009 FOUNDATION WORK POTENTIAL FOUNDATION WORK PARCEL CONTOUR 10 FT CONTOUR 2 FT APPENDIX Exploration Logs (GTL-1 and GTL-2) Classifications of soils in this report are based on visual field and/or laboratory observations, which include density/consistency, moisture condition, grain size, and plasticity estimates and should not be construed to imply field or laboratory testing unless presented herein. Visual-manual and/or laboratory classification methods of ASTM D-2487 and D-2488 were used as an identification guide for the Unified Soil Classification System. OH PT CH OL MH CL ML SM SC GW SP GC SW GM GP Well-graded gravel and gravel with sand, little to no fines Poorly-graded gravel and gravel with sand, little to no fines Clayey gravel and clayey gravel with sand Silty gravel and silty gravel with sand Well-graded sand and sand with gravel, little to no fines Poorly-graded sand and sand with gravel, little to no fines Clayey sand and clayey sand with gravel Organic clay or silt of low plasticity Organic clay or silt of medium to high plasticity Peat, muck and other highly organic soils Silty sand and silty sand with gravel Silt, sandy silt, gravelly silt, silt with sand or gravel Clay of low to medium plasticity; silty, sandy, or gravelly clay, lean clay Elastic silt, clayey silt, silt with micaceous or diatomaceous fine sand or silt Clay of high plasticity, sandy or gravelly clay, fat clay with sand or gravel(1)HighlyOrganicSoilsFine-Grained Soils - 50% or More Passes No. 200 Sieve(1)Coarse-Grained Soils - More than 50% Retained on No. 200 SieveGravels - More than 50% of Coarse FractionRetained on No. 4 Sieve12% Fines5% FinesSands - 50% or More of Coarse FractionPasses No. 4 SieveSilts and ClaysLiquid Limit Less than 50Silts and ClaysLiquid Limit 50 or More(1)(1)12% Fines5% Fines(2)(2)(2)(2)Terms Describing Relative Density and Consistency Estimated Percentage Moisture Content Percentage by Weight <5 5 to <12 12 to <30 30 to <50 Component Definitions Component Trace Some Modifier (silty, sandy, gravelly) Very modifier (silty, sandy, gravelly) Size Range and Sieve Number Larger than 12" Descriptive Term Smaller than No. 200 (0.075 mm) 3" to 12" Coarse- Grained Soils Fine- Grained Soils Density Very Loose Loose Medium Dense Dense Very Dense SPT blows/foot 0 to 4 4 to 10 10 to 30 30 to 50 >50 (3) 0 to 2 2 to 4 4 to 8 8 to 15 15 to 30 >30 Consistency Very Soft Soft Medium Stiff Stiff Very Stiff Hard SPT blows/foot(3) Test Symbols No. 4 (4.75 mm) to No. 200 (0.075 mm) Boulders Silt and Clay Gravel Coarse Gravel Fine Gravel Cobbles Sand Coarse Sand Medium Sand Fine Sand Dry - Absence of moisture, dusty, dry to the touch Slightly Moist - Perceptible moisture Moist - Damp but no visible water Very Moist - Water visible but not free draining Wet - Visible free water, usually from below water table G = Grain Size M = Moisture Content A = Atterberg Limits C = Chemical DD = Dry Density K = Permeability No. 4 (4.75 mm) to No. 10 (2.00 mm) No. 10 (2.00 mm) to No. 40 (0.425 mm) No. 40 (0.425 mm) to No. 200 (0.075 mm) 3" to No. 4 (4.75 mm) 3" to 3/4" 3/4" to No. 4 (4.75 mm) Symbols Sampler Type and Description Blows/6" or portion of 6"15 10 20 California Sampler Ring Sampler Continuous Sampling Grab Sample Portion not recovered Split-Spoon Sampler (SPT) Cement grout surface seal Bentonite seal Filter pack with blank casing section Screened casing or Hydrotip with filter pack End cap ATD At time of drilling Static water level (date) (1) Percentage by dry weight (2) Combined USCS symbols used for fines between 5% and 12% (3) (SPT) Standard Penetration Test (ASTM D-1586) (4) In General Accordance with Standard Practice for Description and Identification of Soils (ASTM D-2488) Groundwater depth i n c o r p o r a t e d e a r t h s c i e n c e s a s s o c i a t e d EXPLORATION LOG KEY FIGURE: A1Blocks\ dwg \ log_key 2022.dwg LAYOUT: Layout 5 - 2022 Logdraft 0 10 20 30 40 50 60 70 100% 100% 100% 80% 100% 1 2 3 4 7/17 1255 7/17 1306 7/18 1109 1138 1142 1209 1221 Fill Brown, silty, fine SAND, some gravel (SM). Increased drill action; driller notes firmer conditions. Vashon Lodgement Till/Pre-Fraser Fine Grained Deposits Cuttings are brown, silty, fine to coarse SAND, some gravel, trace cobbles (SM). Smoother drill action; slower advancement. Vashon Advance Outwash/Pre-Fraser Coarse Grained Deposits Cuttings are brown, fine to medium SAND, trace gravel (SP). Cuttings are brown, fine to medium SAND, trace gravel (SP). Drill chatter; faster advancement. Bouncy drill action; driller notes gravel 42 to 43 feet. Bouncy drill action and chatter 48 to 52 feet. Bouncy drill action and chatter. Cuttings are brown, sandy, GRAVEL; increased 1-inch diameter Centennial CenFuse IPS SDR11 polyethylene flexible pipe loop with fused connector at base +4 to 350 feet Bentonite grout 3 to 355 feet Associated Earth Sciences, Inc. Exploration Boring GTL-1 Hazen High School Modernization Renton, WA Start Date:7/17/24 Logged By:KAM 20210251E003 Ending Date:7/22/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»458 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 1 of 6 80 90 100 110 120 130 140 60% 100% 95% 90% 5 6 7 8 1240 1254 1318 1329 1346 1410 7/18 1427 7/19 0817 advancement; moderate fluid loss; contractor added water (GP). Driller adds water and bentonite. Smoother drilling. Pre-Fraser Fine Grained Deposits Cuttings are gray, SAND, some silt, trace gravel (SP-SM). Cuttings are gray, silty, SAND (SM). Cuttings are gray, SILT; rare silty, fine sand interbeds (ML). Associated Earth Sciences, Inc. Exploration Boring GTL-1 Hazen High School Modernization Renton, WA Start Date:7/17/24 Logged By:KAM 20210251E003 Ending Date:7/22/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»458 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 2 of 6 150 160 170 180 190 200 210 90% 90% 90% 9 10 11 0836 0847 0904 0910 0929 0936 Associated Earth Sciences, Inc. Exploration Boring GTL-1 Hazen High School Modernization Renton, WA Start Date:7/17/24 Logged By:KAM 20210251E003 Ending Date:7/22/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»458 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 3 of 6 220 230 240 250 260 270 280 290 90% 80% 80% 80% 12 13 14 15 0954 1001 1019 1029 1051 1058 7/19 1117 7/22 0816 Increased drill action; bouncing and chatter. Pre-Fraser Coarse Grained Deposits Cuttings are gray, gravelly, SAND (SP). Drill chatter and bouncing (»2 to 3 feet); minor fluid loss. Driller adds water. Recovered larger angular sand and increased drill chatter; bouncy drill action. Increased drill chatter (»2 to 3 feet); minor fluid loss. Driller adds water. Associated Earth Sciences, Inc. Exploration Boring GTL-1 Hazen High School Modernization Renton, WA Start Date:7/17/24 Logged By:KAM 20210251E003 Ending Date:7/22/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»458 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 4 of 6 300 310 320 330 340 350 360 80% 70% 70% 70% 16 17 18 0839 0847 0926 0931 1008 1016 7/22 1051 Increased drill chatter (»2 feet); minor fluid loss. Driller adds water. Cuttings contain more coarse angular fragments; increased drill chatter and bouncing (»6 feet); significant fluid loss. Driller adds water. Increased drill chatter and bouncing (»3 to 4 feet); significant fluid loss; contractor continuously adds water at 5 to 8 gpm. Drill bouncing (»1 foot). Drill bouncing (»1 foot). Bottom of test loop boring at 355 feet. Drill bit used was a tricone rotary bit. Fluid volumes correspond to estimated percentage of drilling mud that was retained within the borehole at depth. Associated Earth Sciences, Inc. Exploration Boring GTL-1 Hazen High School Modernization Renton, WA Start Date:7/17/24 Logged By:KAM 20210251E003 Ending Date:7/22/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»458 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 5 of 6 370 380 390 400 410 420 430 Run times indicate the date and start/end time of each 20-foot drilling interval. Equipment downtime and maintenance resulted in a 4-day duration to complete GTL-1. Associated Earth Sciences, Inc. Exploration Boring GTL-1 Hazen High School Modernization Renton, WA Start Date:7/17/24 Logged By:KAM 20210251E003 Ending Date:7/22/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»458 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 6 of 6 0 10 20 30 40 50 60 70 100% 100% 100% 100% 1 2 3 4 7/24 0829 0850 0902 0941 0958 1016 1023 Fill Moist, brown, SILT, some sand, trace gravel (ML). Production rate slows; drilling fluid pressure increases. Vashon Lodgement Till/Pre-Fraser Fine Grained Deposits Cuttings are brown, sandy, SILT, some gravel; increased drill action (ML). As above; gravel content decreases to trace gravel; smoother drill action. Cuttings are brown, fine to medium SAND, trace gravel; increased drill action (SP). 1-inch diameter Centennial CenFuse IPS SDR11 polyethylene flexible pipe loop with fused connector at base +4 to 350 feet Bentonite grout 3 to 355 feet Associated Earth Sciences, Inc. Exploration Boring GTL-2 Hazen High School Modernization Renton, WA Start Date:7/24/24 Logged By:KAM 20210251E003 Ending Date:7/25/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»460 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 1 of 6 80 90 100 110 120 130 140 100% 100% 100% 90% 5 6 7 8 1046 1115 1152 1159 1210 1215 1233 1239 Cuttings are gray, fine to medium sandy, SILT, trace gravel; smooth drill action (ML). Associated Earth Sciences, Inc. Exploration Boring GTL-2 Hazen High School Modernization Renton, WA Start Date:7/24/24 Logged By:KAM 20210251E003 Ending Date:7/25/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»460 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 2 of 6 150 160 170 180 190 200 210 90% 90% 100% 9 10 11 1246 1251 1302 1309 1325 1331 Increase in gravel content observed while flushing. Gravel content decreases. Increased drill chatter; drill progression slows. Driller adds water. Gray, fine to medium sandy, SILT, trace gravel; smooth drill action (ML). Associated Earth Sciences, Inc. Exploration Boring GTL-2 Hazen High School Modernization Renton, WA Start Date:7/24/24 Logged By:KAM 20210251E003 Ending Date:7/25/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»460 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 3 of 6 220 230 240 250 260 270 280 290 100% 80% 80% 100% 12 13 14 15 1348 1353 7/24 1410 7/25 0835 0844 0851 0906 0916 Pre-Fraser Coarse Grained Sediments Silt content decreases; drill action and chatter increases. Gray, silty, fine to coarse SAND, some gravel; drill action smooths (SM). Sand and gravel content increases while flushing. Gray, silty, fine to coarse SAND, trace gravel; smooth drill action (SM). Gray, silty, fine to coarse SAND, some gravel; drill action and chatter increases (SM). Driller adds bentonite and water; smoother drill action. Gray, silty, fine to coarse SAND, some gravel (SM). Gray, silty, gravelly, fine to coarse SAND; smooth drill action; gravel content increases (SM). Associated Earth Sciences, Inc. Exploration Boring GTL-2 Hazen High School Modernization Renton, WA Start Date:7/24/24 Logged By:KAM 20210251E003 Ending Date:7/25/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»460 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 4 of 6 300 310 320 330 340 350 360 80% 60% 60% 60% 16 17 18 0926 0939 0956 1013 1029 1040 7/25 1103 Driller adds water and bentonite. Drill action and chatter increase. Medium to coarse sand increases; hard drilling; drill rod bouncing. Driller adds water and bentonite; smooth drilling 320 to 324 feet. Hard drilling; bouncing and chatter. Smooth drill action; fine sand content increases. Gray to brownish gray, silty, fine to coarse SAND, some gravel; medium to coarse sand decreases (SM). Medium to coarse sand increases while flushing. Bottom of test loop boring at 355 feet. Drill bit used was a rotary claw bit. Fluid volumes correspond to estimated percentage of drilling mud that was retained within the borehole at depth. Associated Earth Sciences, Inc. Exploration Boring GTL-2 Hazen High School Modernization Renton, WA Start Date:7/24/24 Logged By:KAM 20210251E003 Ending Date:7/25/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»460 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 5 of 6 370 380 390 400 410 420 430 Run times indicate the date and start/end time of each 20-foot drilling interval. Associated Earth Sciences, Inc. Exploration Boring GTL-2 Hazen High School Modernization Renton, WA Start Date:7/24/24 Logged By:KAM 20210251E003 Ending Date:7/25/24 Approved By:JHS Driller/Equipment:Geo Loop Tec / Mud Rotary Hole Dia. (in):6 Total Depth (ft):355 Ground Surface Elevation (ft):»460 Water Level Elevation (ft): Groundwater Depth ATD (ft): N/A (Mud Rotary) Datum:NAVD 88 Depth (ft)Fluid VolumeRun No. & Length%RecoveryRun TimeSampleOther Tests & SamplesGraphic SymbolDescription Water LevelWell Construction 20210251E0038/30/2024Sheet: 6 of 6