U.S. ENVIRONMENTAL PROTECTION AGENCY NATIONAL EUTROPHICATION SURVEY WORKING PAPER SERIES PACIFIC NORTHWEST ENVIRONMENTAL RESEARCH LABORATORY An Associate Laboratory of the NATIONAL ENVIRONMENTAL RESEARCH CENTER - CORVALLIS, OREGON and NATIONAL ENVIRONMENTAL RESEARCH CENTER - LAS VEGAS, NEVADA AOPO 697.O32 ------- REPORT ON LILYU\KE BLUE EARTH COUM7 MINNESOTA EPA REGION V WORKING PAPER No, 107 WITH THE COOPERATION OF THE MINNESOTA POLLUTION CONTROL AGENCY AND THE MINNESOTA NATIONAL GUARD NOVEMBER, 1974 ------- 1 CONTENTS Page Foreword ii List of Minnesota Study Lakes iv, v Lake and Drainage Area Map vi Sections I. Conclusions 1 110 Lake and Drainage Basin Characteristics 2 III, Lake Water Quality Summary 3 1V 0 Nutrient Loadings 6 V. Literature Reviewed 11 VI© Appendices 12 ------- 11 FOREWORD The National Eutrophication Survey was initiated in 1972 in response to an Administration commitment to investigate the nation- wide threat of accelerated eutrophication to fresh water lakes and reservoi rs. OBJECTIVES The Survey was designed to develop, in conjunction with state environmental agencies, information on nutrient sources, concentrations, and impact on selected freshwater lakes as a basis for formulating comprehensive and coordinated national, regional, and state management practices relating to point—source discharge reduction and non—point source pollution abatement in lake watersheds. ANALYTIC APPROACH The mathematical and statistical procedures selected for the Survey’s eutrophication analysis are based on related concepts that: a. A generalized representation or model relating sources, concentrations, and impacts can be constructed. b. By applying measurements of relevant parameters associated with lake degradation, the generalized model can be transformed into an operational representation of a lake, its drainage basin, and related nutrients. c 0 With such a transformation, an assessment of the potential for eutrophication control can be made. LAKE ANALYSIS In this report, the first stage of evaluation of lake and water- shed data collected from the study lake and its drainage basin is documented. The report is formatted to provide state environmental agencies with specific information for basin planning [ 5303(e)], water quality criteria/standards review [ 5303(c)], clean lakes [ 5314(a,b)], and water quality monitoring [ 5106 and §305(b)] activities mandated by the Federal Water Pollution Control Act Amendments of 1972. ------- 111 Beyond the single lake analysis, broader based correlations between nutrient concentrations (and loading) and trophic condi- tion are being made to advance the rationale and data base for refinement of nutrient water quality criteria for the Nation’s fresh water lakes. Likewise, multivariate evaluations for the relationships between land use, nutrient export, and trophic condition, by lake class or use, are being developed to assist in the formulation of planning guidelines and policies by EPA and to augment plans implementation by the states. AC KNO WL EDGMENT The staff of the National Eutrophication Survey (Office of Research & Development, U. S. Environmental Protection Agency) expresses sincere appreciation to the Minnesota Pollution Control Agency for professional involvement and to the Minnesota National Guard for conducting the tributary sampling phase of the Survey. Grant J. Merritt, Director of the Minnesota Pollution Control Agency, John F. McGuire, Chief, and Joel G 0 Schilling, Biologist, of the Section of Surface and Groundwater, Division of Water Quality, provided invaluable lake documentation and counsel during the course of the Survey; and the staff of the Section of Municipal Works, Divi- sion of Water Quality, were most helpful in identifying point sources and soliciting municipal participation in the Survey 0 Major General Chester J. Moeglein, the Adjutant General of Minnesota, and Project Officer Major Adrian Beltrand, who directed the volunteer efforts of the Minnesota National Guardsmen, are also gratefully acknowledged for their assistance to the Survey 0 ------- iv NATIONAL EUTROPHICATION SURVEY STUDY LAKES STATE OF MINNESOTA LAKE NAME COUNTY Albert Lea Freeborn Andrusia Beltrami Badger Polk Bartlett Koochiching Bear Freeborn Bemidji Beltraini Big Stearns Big Stone Big Stone, MN; Roberts, Grant, SD Birch Cass Blackduck Beltrami Blackhoof Crow Wing Budd Martin Buffalo Wright Calhoun Hennepin Carlos Douglas Carrigan Wright Cass Beltrami, Cass Clearwater Wright, Stearns Cokato Wright Cranberry Crow Wing Darling Douglas Elbow St. Louis Embarass St. Louis Fall Lake Forest Washington Green Kandiyohi Gull Cass Heron Jackson Leech Cass Le Flomme Dieu Douglas Lily Blue Earth Little Grant Lost St. Louis ------- V LAKE NAME COUNTY Madison Blue Earth Malmedal Pope Mashkenode St. Louis McQuade St. Louis Minnetonka Hennepin Minnewaska Pope Mud Itasca Nest Kandiyohi Pelican St. Louis Pepin Goodhue, Wabasha, MN; Pierce, Pepin, WI Rabbit Crow Wing Sakatah Le Sueur Shagawa St. Louis Silver McLeod Six Mile St. Louis Spring Washington, Dakota St. Croix Washington, MN; St. Croix, Pierce, WI St. Louis Bay St. Louis, MN; Douglas, WI Superior Bay St. Louis, MN; Douglas, WI Swan Itasca Trace Todd Trout Itasca Wagonga Kandlyohi Wailmark Chisago White Bear Washington Winona Douglas Wolf Beltrami, Hubbard Woodcock Kandiyohi Zunibro Olmstead, Wabasha ------- •Butternut 2 Map Location I I \ _ x LILY LAKE Tributary Sampling Site Lake Sampling Site Sewage Treatment Facility Direct Drainage Area Limits 440 Indirect Drainage Area 0 2 M I __J. Scale ( 20’ 940 15’ 440 05 ------- LILY LAKE STORET NO. 2747 I. CONCLUSIONS A. Trophic Condition: Survey data show that this very shallow lake is eutrophic. With a maximum depth of about six feet, it is quite unlikely that Lily Lake could be anything but eutrophic regardless of cultural influences. Of the 80 Minnesota lakes sampled, only 15% had a greater mean total phosphorus, only 20% had a greater mean dissolved phosphorus, only 8% had less Secchi disc transparency, only 4% had more mean chlorophyll a, but 55% had greater mean inorganic nitrogen. B. Rate-Limiting Nutrient: No algal assay sample was collected; however, the lake data show nitrogen limitation in July and late August, 1972 (N/P ratios were less than 1/1). C. Nutrient Controllability: During the sampling year, there was an unexpected loss of phosphorus from Lily Lake; i.e., about 49% more phosphorus was measured leaving the lake at the outlet station (A-2; see map, page vi) than can be accounted for by all measured and estimated inputs. The cause of this marked imbalance is not known, but it is evident that a more intensive study of nutrient sources is needed. ------- 2 II. LAKE AND DRAINAGE BASIN CHARACTERISTICS A. Lake Morphometry t : 1. Surface area: 142 acres. 2. Mean depth: 3 feet. 3. Maximum depth: 6 feet. 4. Volume: 426 feet. 5. Mean hydraulic retention time: 20 days. B. Tributary and Outlet: (See Appendix A for flow data) 1. Tributaries - Name ______________ __________ Minneopa Creek County Ditch #50 Minor tributaries & immediate drainage — Totals 2. Outlet - Minneopa Creek C. Precipitation***: 1. Year of sampling: 29.7 inches. 2. Mean annual: 25.4 inches. t Schilling, 1974. * Drainage areas are accurate within ±5%; mean daily flows are accurate within ±10%; and ungaged flows ar accurate within ±10 to 25% for drainage areas greater than 10 mit. ** Includes area of lake. See Working Paper No. 1 , “Survey Methods”. Drainage area* 30.8 mi 2 10.4 mi 2 .2 2.2 mi 43.4 mi Mean flow* 7.6 cfs 2.5 cfs 0.5 cfs 10.6 cfs 43.6 mi 2 ** 10.6 cfs ------- III. LAKE WATER QUALITY SUMMARY Lily Lake was sampled two times during the open-water season of 1972 by means of a pontoon-equipped Huey helicopter. Each time, near-surface samples for physical and chemical parameters were collected from a single station on the lake (see map, page vi). Also, during each visit a single sample was collected for phytoplankton identification and enumeration, and a separate sample was taken for chlorophyll a^ analysis. Lily Lake was not sampled a third time, and no sample was collected for algal assays. The results obtained are presented in full in Appendix B and are summarized below. The values presented in these summary tables are not volume-weighted; nonetheless, they are useful as a general guide to differences in water quality at the different sampling times. A. Physical and chemical characteristics: Values 1st Sample 2nd Sample Parameter (07/01/72) (08/30/72) Temperature (Cent.) 24.2 22.0 Dissolved oxygen (mg/1) 10.6 9.2 Conductivity (ymhos) 455 610 pH (units) 8.9 8.6 Alkalinity (mg/1) 131 236 Total P (mg/1) 0.374 0.840 Dissolved P (mg/1) 0.142 0.453 N02 + N03 (mg/1) 0.080 0.150 Ammonia fmg/1) 0.060 0.180 Chlorophyll a (yg/1) 188.4 269.9 Secchi disc Tinches) 16 6 ------- 4 Mm. for Max. for Mean for Parameter all samples all samples all samples Temperature 22.0 24.2 23.1 Dissolved oxygen 9.2 10.6 9.9 Conductivity 455 610 533 pH 8.6 8.9 8.8 Alkalinity 131 236 184 Total P 0.374 0.840 0.607 Dissolved P 0.142 0.453 0.297 NO ÷ NO 0.080 0.150 0.115 AJonia 0.060 0.180 0.120 Chlorophyll a 188.4 269.9 229.1 Secchi disc 6 16 11 B. Biological characteristics: 1. Phytoplankton - Sampling Dominant Number Date Genera per ml 07/01/72 1. Oscillatoria 24,728 2. Scenedesnius 7,817 3. Flagellates 6,362 4. Cyclotella 4,000 5. Gloeocapsa 3,635 Other genera 14,913 Total 61 ,455 08/30/72 1. Cyclotella 16,362 2. Melosira 11,544 3. Oscillatoria 9,273 4. Gloeocapsa 7,273 5. Nitzschia 5,273 Other genera 9,455 Total 59,180 ------- 5 2. Chlorophyll a - (Because of instrumentation problems during the 1972 sampling, the following values may be in error by plus or minus 20 percent.) Sampling Station Chlorophyll a Date Number ( pg/i ) 07/01/72 01 188.4 08/30/72 01 269.9 ------- 6 IV. NUTRIENT LOADINGS (See Appendix C for data) For the determination of nutrient loadings, the Minnesota National Guard collected monthly near-surface grab samples from each of the tributary sites indicated on the map (page vi), except for the high runoff months of March and May, when two samples were collected, and the colder months when samples were omitted at two stations because of low flows. Sampling was begun in October, 1972, and was completed in September, 1973. Through an interagency agreement, stream flow estimates for the year of sampling and a “normalized” or average year were provided by the Minnesota District Office of the U.S. Geological Survey for the tributary sites nearest the lake. In this report, nutrient loads for sampled tributaries were deter- mined by using a modification of a U.S. Geological Survey computer program for calculating stream loadings . Nutrient loadings for unsam- pied “minor tributaries and immediate drainage” (“ZZ” of U.S.G.S.) were estimated by using the nutrient loads, in lbs/mi 2 /year, in County Ditch #50 at station B-i and multiplying by the ZZ area in mi 2 . The operator of the Lake Crystal wastewater treatment plant provided monthly effluent samples and corresponding flow data. * See Working Paper No. 1. ------- 7 A. Waste Sources: 1. Known municipal - Pop. Mean Receiving Name Served Treatment Flow (mgd) Water Lake Crystal 1,626* Trickling 0.220 Lily Lake filter 2. Known industrial - None * 1970 Census. ------- 8 B. Annual Total Phosphorus Loading - Average Year: 1. Inputs — lbs P/ % of Source yr total a. Tributaries (non-point load) - Minrieopa Creek 2,810 30.0 County Ditch #50 840 9.0 b. Minor tributaries & immediate drainage (non-point load) - 180 1.9 c. Known municipal - Lake Crystal 4,490 58.9 d. Septic tanks — Unknown e. Known industrial - None - - f. Direct precipitation* - 20 0.2 Total 8,340 100.0 2. Outputs - Lake outlet - Minneopa Creek 12,460 2. Net annual P loss - 4,120 pounds * See Working Paper No. 1. ------- 9 C. Annual Total Nitrogen Loading - Average Year: 1. Inputs — lbs N! % of Source yr total a. Tributaries (non-point load) — Minneopa Creek 136,350 64.8 County Ditch #50 44,990 21.4 b. Minor tributaries & immediate drainage (non-point load) - 9,520 4.5 c. Known municipal - Lake Crystal 15,040 8.6 d. Septic tanks - Unknown e. Known industrial - None - — f. Direct precipitation* - 1,370 0.7 Total 207,270 100.0 2. Outputs — Lake outlet - Minneopa Creek 218,170 3. Net annual N loss - 10,900 pounds * See Working Paper No. 1. ------- 10 D. Mean Annual Non-point Nutrient Export by Subdrainage Area: Tributary lbs P/mi 2 /yr lbs N/mi 2 /yr Minneopa Creek 91 4,427 County Ditch #50 81 4,326 E. Yearly Loading Rates: In the following table, the existing phosphorus loading rates are compared to those proposed by Vollenweider (in press). Essentially, his “dangerous” rate is the rate at which the receiving waters would become eutrophic or remain eutrophic; his “permissible” rate is that which would result in the receiving water remaining oligotrophic or becoming oligotrophic if morphometry permitted. A mesotrophic rate would be con- sidered one between “dangerous” and “permissible”. Total Phosphorus Total Nitrogen Units Total Accumulated Total Accumulated lbs/acre/yr 58.7 loss 1,459.6 loss grams/m 2 /yr 6.58 - 163.6 Volle weider loading rates for phosphorus (g/m /yr) based on mean depth and mean hydraulic retention time of Lily Lake: “Dangerous” (eutrophic rate) 0.78 “Permissible” (oligotrophic rate) 0.39 ------- 11 V. LITERATURE REVIEWED Anonymous, 1973. Wastewater disposal facilities inventory. MPCA, Minneapolis. Schilling, Joel, 1974. Personal communication (morphometry of Lily Lake). MPCA, Minneapolis. Volleriweider, Richard A., (in press). Input-output models. Schweiz. A. Hydrol. ------- VII. APPENDICES APPENDIX A TRIBUTARY FLOW DATA ------- TRIBUTARY FLOW INFORMATION FOR MINNESOTA 10/30/74 LAKE CODE 2747 LILY LAKE TOTAL DRAINAGE AREA OF LAKE 43.60 SUB—DRAINAGE NO MAL1ZED FLOWS TRIBUTARY AREA JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC MEAN 2747A 1 30.80 0.42 0.59 6.14 29.20 14.80 20.70 8.1 4.13 3.15 2.06 1.67 0.75 7.64 274742 43.60 0.60 0.85 8.97 41.90 20.90 27.00 11.40 5.77 4.28 2.85 2.36 1.03 10.65 274781 10.40 0.15 0.18 2.64 9.31 4.80 7.06 2.65 1.18 1.04 0.60 0.46 0.25 2.52 274712 2.20 0.02 0.02 0.37 1.87 1.02 1.59 0.58 0.34 0.25 0.12 0.08 0.04 0.52 SUMMARY TOTAL DRAINAGE AREA Of LAKE • 43.60 TOTAL FLOW IN = 128.41 SUM OF SUB—DRAINAGE AREAS — 43.40 TOTAL FLOW OUT = 127.91 MEAN MONTHLY FLOWS AND DAILY FLOWS TRIBUTARY MONTH YEAR MEAN FLOW DAY FLOW DAY FLOW DAY FLOW 2747A1 10 72 2.03 15 1.20 11 72 4.73 5 11.00 12 72 1.40 4 2.40 1 73 2.23 13 0.80 2 73 2.35 4 4.80 3 73 24.40 3 12.00 4 73 12.00 24 9.40 5 73 17.30 16 12.60 31 24.00 6 73 6.2! 7 73 0.82 12 0.70 8 73 0.33 9 73 0.41 2 0.40 274742 10 72 2.81 15 1.70 11 72 6.66 5 16.00 12 72 1.94 4 3.30 1 73 3.19 13 1.20 2 73 3.39 4 4.00 3 73 35.70 3 18.00 4 73 17.20 24 13.00 5 73 24.40 16 18.00 31 34.00 6 73 7 73 1.14 12 0.90 8 73 0.46 9 73 0.56 2 0.55 ------- TRIBUTARY FLOW INFOp MATION FOR MINNESOTA 10/30/74 LAKE CODE 2747 LILY LAKE MEAN MONTHLY FLOWS AND DAILY FLOWS TRIRUTARY MONTH YEAR MEAN FLOW DAY FLOW DAY FLOW DAY FLOW 2747B1 2747Z7 10 11 12 1 2 3 4 5 6 7 A 9 10 11 1? 1 ? 3 4 5 6 .7 8 9 72 72 72 73 73 73 73 73 73 73 73 73 72 72 7 73 73 73 73 73 73 73 73 73 0.59 1.29 0.46 0.80 0.72 10.50 3.82 5.62 2.12 0.27 0.09 0.14 0.11 0.22 0.07 0.11 0.08 1.47 0.77 1.19 0.48 0.06 0.03 0.03 5 5 4 13 4 3 24 16 12 2 15 5 4 13 4 3 24 16 12 2 0.40 3.00 0.80 0.30 0.90 5.40 3.00 4.10 0.22 0.05 0.03 31 7.80 0.14 0.06 0.50 0.10 0.04 0.10 0.80 0.60 0.90 31 1.60 ------- APPENDIX B PHYSICAL and CHEMICAL DATA ------- ST1P T ‘Jf T ’IFv i ‘)Pi1 ,‘..‘I0/30 ?7470) 44 07 0).0 094 1:1 su.o LA cf LILY dlflhl IJNNESOTA I IF”AL [ S 211120? 000? FEET DEPTH 7?/07/0I 07 30 (‘100 72/OM/1() i’ ic ( 000 OIC It’ A t T € C l 1’ 3 / .- I. IJ. ‘/3 I H.. I •)0017 I) ’) T ANSP Si CCr’l lh/L I NC”il S 00094 C N D I I CT V V 3Jf LI) MICtifiMNO 00e30 NO? MO3 N—TOTAL M (,/ L 00 1, 10 Nr 13-N TOT AL MC,/L )A T F r.. ,,• T) 1I ’ . ‘)I’-’i’-4 ) I ‘). Y FF T 00400 00’.I0 7 AL’c CACO1 M6/L IG. ’ ie 4cc 34.90 131 u.0 ’ u 0.060 0.374 0.14? ‘•1 I0 14.6 5 21e u.I5’) 0. IA O 0. 40 0.453 11’ ;_-.• I ’.• 00665 00666 P’ iOS—TOT PI-IOS—r)IS M(,/L P 14G/L P I I’ “)I T-’ (ii J Y 1111 7?/0 /0I 0’ 0 tl000 7,/()H/V’ V4 i i)0fl J V L’IF < J1 . T , ..fl ’) ------- APPENDIX C TRIBUTARY and WASTEWATER TREATMENT PLANT DATA ------- STORET RETRIEVAL DATE 74/10/30 274741 LS2747A1 44 07 30.0 094 15 00.0 M!NNEOPA CREEK 27 15 MANKATO WEST I/LILY LAKE Co HWY 111 RDG 1 MI UPSTREAM OF LILY LK 1 IEPALES 2111204 4 0000 FEET DEPTH 00630 00625 00610 00671 00665 DATE TIME DEPTH NO?F NO3 TOT KJEL NH3—N PHOS—DIS PHOS-TOT FROM OF N—TOTAL N TOTAL ORTHO TO OAY FEET MG/L MG/L MG/L MG/L P MG/L P 72/10/15 14 00 1.560 0.840 0.140 0.048 0.107 72/11/05 10 00 5.200 2.520 0.064 0.089 0.230 7?/!2/04 0.028 0.990 0.054 0.005K 0.011 73/03/03 10 00 5.300 3.990 0.590 0.410 0.700 73/03/?3 14 00 11.000 2.900 0.350 0.046 0.110 73/04/24 14 50 16.400 1.150 0.020 0.042 0.100 73/05/16 08 30 15.200 1.600 0.115 0.050 73/05/31 09 00 17.000 1.400 0.066 0.029 0.155 73/07/12 10 00 5.900 1.540 0.147 0.076 0.135 73/09/07 14 30 0.500 3.400 0.147 0.210 0.345 K VALUE KNOWN TO BE LESS THAN INDICATED ------- STORET RETRIEVAL DATE 74/10/30 2747A? LS2747A2 44 07 00.0 094 13 00.0 MINNEOPA CHEEK 27 15 MANKATO WEST 0/LILY LAKE Co HWY 20 9 DG AT OUTLET OFLILY LAKE 1 1EPALES 2111204 4 0000 FEET DEPTH 00630 00625 00610 00671 00665 DATE TIME DEPTH N02&N03 TOT KJEL NH3—N PHOS—DIS PHOS—TOT FROM OF N—TOTAL N TOTAL ORTHO TO DAY FEET MG/L MG/L MG/L MG/L P MG/L P 72/10/15 13 30 0.016 4.485 0.102 0.084 0.165 72/11/05 10 00 1.110 3.600 0.067 0.132 0.460 72/12/04 15.500 0.100K 0.042 0.042 0.063 73/01/13 11 00 9.450 7.300 4.800 1.700 2.100 73/02/04 09 00 5.000 4.900 2.600 0.970 1.300 73/03/03 11 30 5.600 2.900 0.890 0.310 0.430 73/03/23 13 30 9.200 5.100 0.600 0.273 0.400 73/04/24 20 00 10.000 2.600 0.026 0.044 0.220 73/05/16 08 00 10.300 3.100 0.098 0.066 0.970 73/05/31 09 30 14.000 0.805 0.250 0.037 0.13S 73/07/1? 11 08 0.026 5.500 0.096 0.350 0.720 73/09/02 14 50 0.021 0.160 0.420 1.050 K VALUE KNOWN TO HE LESS THAN INDICATED ------- STORET RETRIEVAL DATE 74/10/30 ?747fl Ls2747R1 44 06 30.0 094 14 00.0 UNNAMEI) STREAM 27 5 MANKATO WEST T/LILY LAKE Co HWY 6 XING NW OF LK CP YSTAL 1 1EPALES 2111204 4 0000 FEET DEPTH 00630 00625 00610 00671 00665 DATE TIME DEPTH N02&N03 TOT KJEL NH3—N PHOS—DIS PHUS-TOT FROM OF N-TOTAL N TOTAL ORTHO TO DAY FEET MG/I MG/I MG/L MG/L P MG/L P 72/10/15 13 45 1.370 0.400 0.031 0.034 0.060 72/11/05 10 00 3.200 0.150 0.048 0.115 0.160 7?/12/04 12.800 0.308 0.048 0.063 73/03/03 09 00 0.357 4.500 0.900 0.022 73/03/23 13 00 14.000 4.400 1.105 0.086 (1.155 13/04/24 09 00 17.000 0.260 0.040 0.084 0.185 13/05/16 09 00 15.200 4.300 0.100 0.120 0.600 73/05/31 09 15 19.000 0.032 0.026 0.105 71/07/12 10 30 6.400 2.200 0.096 0.056 0.200 73/09/0? 15 00 0.850 2.100 0.176 0.105 0.flO ------- STO QET -‘FT IEVAL )ATr ‘./1. /3O P001807 ?14751 TF274751 44 05 30.0 094 13 00.0 LAKE cpysrAL 27.13 W MAN$(ATO li/LILY LAKE LILY LAKF 1 I ALES 4 2141204 0000 FEET DEPTH (‘.Jf 71 0 -S 50351 50053 flATE TI r) i T iO ”fl1 Tur KJ L 1—N P•IOS—DIS HOS—TOT FLOW CUNI)IJIT FPO’4 (W J-TUTAL 4 TI)TAL O 1HO ArL FLO i—MGD Tfl i AY FF T 1 ’ -’/L iC/L ‘/L M1,/L -‘ MG/L P INST MC,1) MONTHLY 73/01/27 ii (10 CP(T)- o. o 73/ )/7 13 ( ‘fl 73/3?/?’ 11 ( 0 COlT)— 1.ft i 1 ‘- . ‘-. (u 17.’’ ) O 0.200 0.225 73/c?/? 1T ‘ 0 71/93/27 7ry. 4 Q5 ) 73/fl4/ 4 •)Q (0 • • •P ,.i0 0.200 73/’ 5/ ) I’ O lP . .) c.1 00 11.000 0.225 73/’ ’-/21 H 00 ‘. 1. o. 1.]9 :: .l0O “. 1 )00 0.??S 0.225 73/07/1’) 1’) 1)0 •41t 5.Oi - . i)0 t . -60 u.2 50 0.250 73/0 /21e LI Ii ’ ) c ’ .73 ??.fl i - . ‘0 4.740 7.uO O 0.200 0.200 71/’ /?’ 0 11) .‘ ,7Z 13.?’) ?. 1e 0 4.200 5.500 0.275 73/1o/?J OQ CO 7 •’ )0 1S.fl )o 2.11)0 .30C 0.200 0.200 71/11/21 I )0 ). ‘ii 1.900 11.000 0.220 0.220 71/ 17/71 - . •1 30 1.( -’j 7. 1 )C 1?. 0C .JOC 6.600 0.225 0.225 7 ./Q1/?Q 09 01) ‘.1’ L - 3 - . 1i’ -(.600 0.220 ------- |