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Home My WebLink AboutSWP272264(3) City of Renton Nvdrogeologic Report Production Well Nos. 10 & 12 Maplewood Golf Course November 23, 1994 Draft No. 1 Prepared by: b was advanced through the unconsolidated material concurrently with drilling. The casing appeared to be maintained within 5 feet of the bottom of the hole. New sections of casing were each butt welded to the casing string. Each individual weld was not inspected by the on-site hydrogeologist, however, the observed welds were full, continuous, running welds that appeared to penetrate the entire thickness of the pipe wall. Well logs for both production wells are presented in Appendix A. 1. Production Well No. 10 rThe water rights application number for PW-10 is G 1-24783. According to this permit, the production well is to be located within the NW 1/4 of the NW 1/4 of Section 22. The water rights application also specifies a maximum instantaneous withdrawal of 1,600 gpm and a maximum annual withdrawal of 1,792 acre-feet per year. d Production Well No. 10 drilling began May 4, 1994. The drilling target was the "middle aquifer", as identified in the City of Renton Monitoring Well Installation Project Report (RH2 Engineering, August 1993). This aquifer was also identified as the "production aquifer" in the Final Hydrogeologic Report of the Maplewood Production Wells PW-11 and PW-17, (Pacific Groundwater Group, January 1990). Although both reports recognize the presence of this aquifer, they differ in their interpretation of the origin and rextent of the coarse grain sediments. The driller installed 50 feet of 20-inch sanitary seal was installed along with 225 feet of seamless 16-inch black steel casing. On the first day of drilling. water bearing sand and gravel were encountered at a depth of 13 feet. Except for some caving around the wellhead, drilling conditions were favorable. The subsurface formation sediments consisted of relatively soft, unconsolidated sand and gravel. Large boulders or other obstructions were not encountered during the drilling operation. The bailed water did produce slightly noticeable hydrogen sulfide odor during construction. Drilling was interrupted for 2 days, May 11 and May 12, 1994, after the brake broke on the drilling rig, causing the bailer to become wedged at the base of the hole. A latch jack was brought on-site by Holt Testing to remove the bailer from the borehole. Subsequently, Holt Testing used a smaller diameter bailer and did not experience further drilling problems. r Drilling was completed to a depth of 225 feet on May 18, 1994. The well was logged by Richard Miller of Holt Drilling and Jim Schechtman and Geoff Clayton of RH2 Engineering. The well log for PW-10 is presented in Figure A-1. Samples of the target aquifer were collected and delivered to Cook Screen Technologies, Cincinnati, Ohio, for grain size analysis and screen design. REVISION DATE:November 23,1994 3 J:\DATAWEMt92.058WPTJS.DOC 2. Production Well No. 12 The water rights application number for PW-12 is G1-24782. According to this permit, the production well is to be located within the SE '/4 of the SE 1/4 of Section 16. The water rights application also specifies a maximum instantaneous withdrawal of 1,600 gpm with a maximum annual withdrawal of 1,792 acre-feet per year. rProduction Well No. 12 drilling began June 7, 1994. The drilling target was the "middle aquifer" encountered at Monitoring Well No. 36 (MW-36), as identified in the City of Renton Monitoring Well Installation Project Report (RH2 Engineering, August 1993). This aquifer is most likely the same aquifer that supplies Production Wells 11 and 17, as identified in the Final Hydrogeologic Report of the Maplewood Production Wells PW-11 and PW-17, (Pacific Groundwater Group, January 1990). Fifty (50) feet of 24-inch sanitary seal was installed along with seamless 20-inch black steel casing. The 20-inch casing was reduced (telescoped) to 16-inch casing at a depth of 307 feet to improve drilling and driving conditions. Water bearing sand and gravel first occurred at a depth of approximately 13 feet. As in PW-10, the PW-12 sediments encountered consisted of relatively soft, unconsolidated silt, sand and gravel. However, more silty sand was encountered in PW-12 than in PW- 10. The water again produced a conspicuous hydrogen sulfide odor during construction. Drilling was stopped when siltstone bedrock was encountered at 350 feet on July 19, 1994. The well was logged by Richard Miller of Holt Testing and Jim Schechtman of RH2 Engineering. The well log for PW-12 is presented in Figure A-2. Samples of the deep aquifer were delivered to Cook Screen Technologies, Cincinnati, Ohio, for sieve analysis and screen design. D. SIEVE ANAL YSIS The sieve analyses were performed by Cook Screen Technologies using a set of 203 mm brass sieves and procedures outlined in ASTM D-422. The sieve analysis involved the placing of bailed sediment samples of the top sieve. Largest openings are on the top sieve with progressively smaller openings on lower sieves. The stack of sieves is vibrated to allow the individual sediment particles to fall through the sieve openings. The grain-size distribution (particle-size distribution) of the sediments is then determined by measuring the dry weight of the material retained on each sieve. The weight of each size fraction was then expressed as a percentage of the total sample. Graphs of the specific grain-size distribution for each sample are REVISION DATE:November 23,1994 4 J:\DATA\REN\192-058\RPTJS.DOC 2. Production Well No. 12 An initial pump test demonstrated that the desired production level of 1,500 gpm was not available from PW-12. Consequently, the step drawdown test was the only aquifer test completed at PW-12. The continuous 24-hour pump test was postponed until the production rate can be improved by performing advanced development techniques. Monitoring wells MW-36S, MW-36D and production well PW-17 were employed as observation wells during the step test. The effective screened interval (307 - 344 feet) in PW-12 is located in the middle aquifer. There does not appear to be any hydraulic continuity between PW-12 and MW-36S based on observations made during the step drawdown test. The step drawdown test confirmed hydraulic continuity exists between PW-12, PW-17, and MW-36D. MW-36D was continuously monitored during the step-drawdown test while PW-17 was less frequently monitored for quantitative conclusions. Drawdown data for PW-12 is presented in Figure C-3 and drawdown data for MW-36D is presented in Figure C-4. G. HYDROGEOLOGY The shallow unconfined aquifer has been found at a depth of 13 to 55 feet in every boring completed to date at the site. The Renton Parks Department is presently withdrawing water from the shallow aquifer for irrigation on the golf course, This aquifer, however, is not of interest to the City Water Department because of its vulnerability to surface activities and contamination and its continuity with the Cedar River. The shallow aquifer appears to have limited hydraulic continuity with the middle aquifer in the vicinity of PW-10 and PW-12. The shallow aquifer was not affected during the test pumping of either production well. The middle aquifer is the principal production aquifer for PW-11, PW-17, PW-10 and PW-12. 1. Production Well No. 10 (PW-10) Three discharge rates were used during the step-drawdown test: 150 gpm, 300 gpm, 455 gpm. The respective drawdowns for each step were about 22, 25 and 33 feet for a total of 80 feet in PW-10. Specific capacity declined 17%, from 6.9 to 5.7 gpm/ft as the pumping rates were increased. The well loss coefficient and the formation loss coefficient each respectively increased as pumping continued and the pumping rates were increased. Figure C-1 suggests that formation loss, due to low aquifer transmissivity, is the dominating factor affecting production volumes. r REVISION DATE:November 23,1994 8 JADATA\REN\1 92-058\RPTJS.DOC - , , 7,-e CITY OF RENTON • : PRODUCTION AND 12 DEVELOPMENT GEOLOGIC FEATURES CROSS SECTION 1 BEDROCK CROSS SECTION 2 100 BEDROCK BEDROCK CONTOURS ALTITUDE SCALEIVISL (FT) 1`� .��II..► .. ... PLANNERS k �1 _ IIIIC � r • so ,.al10 OR I■ _l fir►., ,��'� i "M i:.r vv� DISTANCE ALONG CROSS SECTION (ft) NNW ,. 800 0 1500 3000 4500 6000 7500 9000 10500 12000 13500 15000 16500 16000 19500 21000. . . . . . . . . . . . . . . . . . . . 22500 24000 25500 2700D MOD 30000 J1500 . 36000 37500 34500. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39000 40500 42000 COOT ? 43500 Lake Coal ? Y500 ocnys Coal? . . . . . . . . . . . . . . . . 470 . . . . . . . . . . . . . . . . . . . . . . . . . ' . . . . Benchmark . . . . . . . . .. . 3g 492 400 . . . . . . . . . . . . . . . . . for cross rou su�cce rofile No top MW-35 . . . . . . . . 300 i 290 ip 2e - ; � . 3 . .. . . . . . . . . . . . . . . . . . . . : tijghldnd'2 200 W-11 PIN Well 5 P 17 .No`�. . . Renton Exp. 160 ft. Veenhuiien /]�`'` / \\ Wonderland outcrop ; OBW- W-37 Qoutcrop- . . . 100 2w Test below Cedar MW-36 3w 1 50 No L River + p 3w °p : Lake WosMn ton \. - o ;. . . . . MW 38• . 12ft. 9 J 1 --:----- T . below `I -_ ---- F- -200 \ -136 1 - ---- a..� J �a\.18. . . . . . :. . . 171 - below : -149 r _ below 1-241 -J00 . . . . . . . . . . . . . .: . . . . . . .. . . . . . ..� No Log_ - -2 2w / \ : : : _ . . . . . . . . . . . . . . . . . . . ./ ,�..\\\. . . . . . . . . . . . . . . . . � . . . . /: . . /// . . :. . . . . . . : . . . . . .. . . . . . . . . . . . . . . . . . . .. .. .� . . . :. . .. . . .: . . . . . . - \`\ Inferred depth to bedrock along cross section 1 - bePow > 4e Je . . . . . - . . ... . / below / -700 . e �.� . . .3. . Z5 f SCALE IV= 15H . . . . . . - . LEGEND MW-00 Well Identification Well terminated in bedrock (Well on cross section) Well Depth (Most are projected onto the FIGURE 4 Well terminated 1n bedrock �_ - ground surface profile of the cross section) CROSS SECTION NO. 1 (Well not on cross section) _ Water bearing sands or gravels. 1 Well terminated on unknown distance above bedrock `-3e - Distance and direction of well from cross section. CITY OF RENTON. (Well on cross section) No number = on cross section PRODUCTION WELL 1 = 200' to 1200' from cross section 10 & 12 DE Well terminated an unknown distance above bedrock 2 = 1000' to 2000' from cross section (Well not on cross section) 3 = 2000' to 3000' from cross section 4 - 3000' to 4000' from cross section e = east, w = west, n = north, s = south rsEvlSFa �ucus7l taps, 9>A WNW DISTANCE ALONG CROSS SECTION (ft) ESE 4�0 1500 3000 4500 6000 7500 9000 10500 12000 13500 15000 16500 18000 19500 21000 23500 24000 25500 Bench Mork 359' 300 - - : . . _ 200: MW-20 MW-1 COW-1 PW-1,2,3. PW-�7 ; Rrnton E nh pp. Veeui— - MW-25 . 100 : - TW-1 - j _ Wonderland 0-11 WW-2 MW-37 MW-32 (,7W-33 MW-36 - -- --- -- MW-27 - - - -- - -- --- -- - ------------------- - ---- - : r-. -200: . . . . _ _ _ ; - - ; : No Log J CO No Log F� as . . . . _ . . . . ��. . . : . . . . w J \� : -500 -600 -700 SCALE: IV=15H LEGEND MW-00 Well Identification ■ Well terminated in bedrock (Well on cross section) Well Depth (Some are projected onto the FIGURE 5 `J ground surface profile of the cross section) CROSS SECTION NO. 2 El Well terminated in bedrock (Well not on cross section) _ ' Water bearing sands or gravels. 1 Well terminated an unknown distance above bedrock 3e° Distance and direction of well from cross section. CITY OF RENTON (Well on cross section) number = on cross section 1 PRODUCTION WELLS 1 = 200' to 1000' from cross section Well termin ted an unknown distance above bedrock wl :k r n 2 = 1000• to 2000' from cross section 10 & 12 DEVELOPMENT M J\/L a 3 = 2000' to 3000' from cross section (Well not on cross section) r+ 4 = 3000' to 4000' from cross section e = east, w = west, n = north, s = south W" RENSEIY. AU=t%1993'C• +' -