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HomeMy WebLinkAboutCOM 0009.000 1996-1998 C , L. ~ ~%°I°I~j~ DEPARTMENT OF THE ARMY PACIFlC OCEAN DIVISION, CORPS OF ENGINEERS FORT SHAFTER, HAWAII 96859.5440 REPLY TO ATTENTION OF November 1, 1996 ~ .~i: i ;i ` .;G . ~ ~ :i Planning and Operations Division Councilman Brian J. DeLima Chair, Hawaii County Council 25 Aupuni Street Hilo, Hawaii 96720 Dear Mr. DeLima: The enclosed federal Finding of No Significant Impact (FONSI) and Environmental Assessment (EA) for the Alii Drive Shore Protection project is provided for your information. The EA concludes that an Environmental Impact Statement (EIS) is not needed because there are no significant adverse impacts expected from this project. If you have comments regarding this FONSI and EA, please provide them by November 30, 1996 to the address below: District Engineer U.S. Army Engineer District, Honolulu Attention: CEPOD-ET-PP/Mr. Lennan Building 230 Fort Shafter, Hawaii 96858-5440 Sincerely, ~.c~ ay H. Jyo, P.E. Director of Engineering and Technical Services Enclosure (3e~ m. ~a ~LG x~c. rD>, 1lec. Dsee~ ~MIOV ~ o poa FINDING OF NO SIGNIFICANT IMPACT Ali'i Drive Shore Protection Project Kailua-Kona, Island of Hawaii, Hawaii 2 October, 1996 1. DESCRIPTION OF THE PROPOSED ACTION. At the request of the Mayor of Hawaii County, the Corps proposes to construct improvements to the existing 700-foot long sea wall along Ali'i Drive. The seawall was originally constructed on a foundation of boulders approximately 5 feet in diameter. Waves are free to progress through the large cavities between the boulders and have eroded the soil material behind the seawall, damaging the sidewalk and roadway behind the seawall. The proposed project consists of placing geotextile bags within the Oceanside interstices of the seawall rock foundation and pumping concrete directly into the bags. Pumping operations are expected to be conducted from Ali'i Drive. This initial phase of construction will close the larger voids and prevent escape of concrete fines into the ocean during the second phase pumping operations. The second phase grouting operation would consist of drilling holes up to 6 inches in diameter at intervals of 5-10 feet along the length of the seawall in order to pressure inject grout to fill the voids in the seawall foundation and to prevent further movement of the material from behind the seawall. 2. BASIS FOR FINDINGS. The following factors were considered in the Findings. See the attached Environmental Assessment (EA) for a more complete discussion. 2.1 The project area has previously been disturbed by construction of the seawall, sidewalk and roadway. The site is not in a wetland, special aquatic site, municipal water supply, marine sanctuary or wildlife refuge. 2.2 Grouting the foundation of the existing seawall would not change the environmental setting, but would increase the integrity of the existing structure against failure for the foreseeable future. Environmental effects of project construction would be localized and temporary, including restricted traffic flow. No long-term environmental effects of any kind are expected. 2.3 There are no State of Hawaii or Federal candidate, proposed or listed threatened or endangered terrestrial species in the project area, and the National Marine Fisheries Service has agreed with our conclusion that there would be no effect on such species under their jurisdiction such as the humpback whale and green sea turtle. 2.4 Although there is documentary evidence that a significant archaeological site (Pa a Umi) may be located beneath the seawall, sidewalk and roadway, the drilling portion of the project will occur in the upper two feet of soil material, which was likely disturbed during the initial construction of the seawall, sidewalk and roadway. It is unlikely that the project will have any impact on cultural resources. In reaching this conclusion HED solicited comments from 22 Native Hawaiian and other civic groups and individuals, as well as the National Park Service and the State Historic Preservation Office (SHPO). The SHPO concurred with our determination that there would be no adverse effect to historic properties. At the request of the SHPO an informative plaque will be placed on the seawall after completion of construction. 2.5 The list of mitigation measures contained in the attached EA will be incorporated in the Plans and Specifications for the project. 2.6 A State of Hawaii 401 Water Quality Certification or waiver will be obtained prior to commencement of construction. 2.7 I have determined that this project is consistent with the State's approved Coastal Zone Management Program. The State of Hawaii's concurrence with this determination or waiver will be obtained before construction commences. 3. FINDING. Based on the analysis of environmental effects contained in the attach EA, I find that the proposed shore protection project at Ali'i Drive, Kailua-Kona is not a major Federal action significantly affecting the quality of human life. An environmental impact statement will therefore not be prepared for this project. ~ RALPH H. GRAVES Lieutenant Colonel, U.S. Army District Engineer ~~doQO~~~~~a~ Boa d0°0 DG30M~ ~C~OG°~C~ pQO~CC~400G~ G~Ga0[~~La~G~ o0~]Ga~, C~]La~La00 Prepared by: U.S. Army Engineer District, Honolulu Planning and Operations Division Fort Shafter, Hawaii 96858-5440 2 October, 1996 COVER SHEET Lead Federal Agency U.S. Army Engineer District, Honolulu Lead County of Hawaii Agency Department of Public Works Proposed Action Correct undermining of sidewalk and road fronting Kailua Bay (Ali'i Drive) Project Location Kailua-Kona, Hawaii, Hawaii Type of Report Environmental Assessment (EA) Abstract: The project is authorized under the authority of Section 14 of the Flood Control Act of 1946, as amended. The project was initiated in response to a letter dated 8 August 1991 from the Mayor of the County of Hawaii requesting assistance for shoreline protection along Ali'i Drive fronting Kailua Bay in Kailua-Kona. An ancient Native Hawaii site, Pa O 'Umi may be located within the project area. Because of the mitigation proposed, the State Historic Preservation Officer (SHPO) has concurred with our determination that the proposed action will have no adverse effect on this potential historic property. No other significant resources were identified within or immediately adjacent to the project area; therefore, the proposed action would not have an adverse impact on significant resources, and consequently an environmental impact statement is not needed. The proposed action has been identified as the National Economic Development (NED) Plan, and is therefore the recommended alternative. Please provide your comments on this EA by November 30, 1996 to: Commander U.S. Army Engineer District Building 230 Attn: CEPOD-ET-PP/Lennan Fort Shafter, HI 96858-5440 Telephone (808) 438-2264 i TABLE OF CONTENTS TITLE PAGE Cover Sheet i Table of Contents ii 1. Project need 1 a. Background 1 b. The Problem 1 2. Affected Environment 2 a. General 2 b. Physical Conditions 2 c. Natural Resources 11 d. Cultural Resources 12 e. Recreation 12 f. Economics 13 3. The Proposed Action and Alternatives Considered 14 a. Proposed Action 14 b. No Action (Alternative A) 14 c. Toe Protection Structure (Alternative B) 14 d. Revetment Designed to Prevent Overtopping (Alternative C) 16 e. Geotextile (Alternative D) 16 f. Beach Replenishment (Alternative E) 16 g. Comparative Summary of Alternatives 16 4. Environmental Consequences of Proposed Improvements 17 a. Environmental Setting 17 b. Terrestrial Resources 17 c. Marine Resources 17 d. Endangered and Threatened Species 17 e. Water quality 18 f. Air Quality, Noise and Traffic 18 g. Cultural Resources 18 h. Recreation 19 i. Coastal Zone Program Consistency 19 j. Section 122 Effects 19 k. Mitigation Recommended 19 5. Agencies and Persons Contacted 20 a. Federal Agencies 20 b. State of Hawaii Agencies 20 c. County of Hawaii Agencies 20 d. Private Organizations and Individuals 20 6. References Cited 21 ii TABLB OF CONTENTS (Continued) LIST OF FIGIIRES Figure 1. Location Map 3 Figure 2. Project and Storage Area Location 4 Figure 3. Tsunami Wave Runup Heights, Kona Coast 8 Figure 4. Wave Inundation Areas for 100-year Flood, Kailua, Hawaii 9 Figure 5. State of Hawaii Water Quality Sampling Stations 10 Figure 6. Typical Grout Fill Section 15 APPENDICES Appendix A. Compliance Documents Appendix B. History Appendix C. Letters of Comment and Responses iii 1. PROJECT NEED a. Background. During the early 1950's, the owners of the properties fronting the beach along Kailua Bay, Kailua-Kona, Island of Hawaii, built a recurved wall approximately 700 feet long (Figures 1 & 2). The wall rests on a foundation of large boulders having an average diameter of about 5 feet. There are no as-built drawings for the wall on record; however, local residents recall that the seawall has a steel sheetpile cutoff wall behind the boulders and beneath the sidewalk. The cutoff wall retained the soil that forms the foundation for the sidewalk and the roadway (Ali'i Drive). The beach that previously existed seaward of the wall has since eroded, exposing the boulder foundation of the wall to constant wave action. The wave energy penetrates through the large cavities between the large foundation boulders and causes the erosion and piping of fine-grained subgrade materials. It is believed that corrosion of the steel sheetpile cutoff wall has also taken place over time, exposing the foundation of the sidewalk and roadway to erosion from the same wave action. b. The Problem. The primary problem is shifting of the seawall and the deterioration of the sidewalk and roadway due to an unstable foundation caused by the piping of the subgrade materials. The erosion of the foundation materials has caused one section of the wall to shift, the sidewalk to crack and fail in several locations, and "alligator" cracking and large potholes in the roadway pavement. A secondary cause of damage to the sidewalk and roadway is from waves overtopping the seawall. The damage to the sidewalk and roadway from overtopping is relatively minor and is the result of debris deposited on the pavement. The Hawaii County Department of Public Works has patched the cracks which periodically have grown as the seawall shifted and has repaired the holes which continually form in the sidewalk and roadway. The accelerating rate of erosion, however, has caused a need for more frequent repairs and threatens the integrity of both the sidewalk and the roadway. Ali'i Drive is a key roadway within Kailua-Kona, paralleling the coastline and linking the major business and cultural activities in Kailua-Kona. CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii 2. AFF8CT8D BNVIRONMSNT. a. GBNSRAL (1). The study area is located in the town of Kailua- Kona on the west coast of the Island of Hawaii, Hawaii. The Hawaiian Island Chain consists of eight major islands which comprise more than 99 percent of the approximately 6,500 square miles of total land area in the State of Hawaii. The State capital, Honolulu, is located on the Island of Oahu, approximately 2,560 miles southwest of Los Angeles, California. The Island of Hawaii, also known as the Big Island, is the largest of the Hawaiian Islands, encompassing 4,038 square miles of land area and 305 miles of coastline. Kailua-Kona on the west coast and Hilo, on the east coast are the island's two major population centers (Figure 1). (2). The town of Kailua-Kona has a population of approximately 11,000 people, comprising nearly 10~ of the island's population. Historically, the early Hawaiians used the Kailua Bay area as a royal residence. The modern-day town developed around Kailua Bay as the cattle industry developed on the Island of Hawaii. Ships docked at Kailua-Kona to take on fresh meat. Kailua Bay is now primarily used for small fishing vessels, and tour boats. The project area is located along the portion of Ali'i Drive which borders the Kailua Bay and which is protected by a 705-foot seawall, constructed circa 1952 (Figure 2). (3) The bay's shoreline and backshore areas are developed with piers, seawalls, rock revetments, sidewalks and roadways, which are maintained by the County of Hawaii. The pier is under the control of the State Department of Land and Natural Resources, Division of Boating and ocean Recreation. b. PHYSICAL CONDITIONS. (1). Climate. The island of Hawaii lies well within the belt of northeasterly trade winds, generated by the semipermanent Pacific high pressure cell located to the northeast. The subtropical climate provides equable temperatures from day-to- day and season-to-season. Average daily temperatures in Kailua- Kona range from about 70 degrees Fahrenheit (F) during the coolest months of January through March to about 80 degrees F during the warmest months of July through September. The average annual precipitation is approximately 40 inches at sea level. Frontal weather is usually responsible for winter storms that occur during the months of November through February (State of Hawaii 1988 Data Book and NOAA 1990 Weather Summary). 2 160° 159° I5B° 157° 156° 155° ~e STATE OF HAWAII 0 20 eo NIIMAU KAWI OAHU ~ O NAUTICAL MILES ~ QC MOUOIUI ~C 21° NAu LANAI O O N A C~4y KANOOIAWE HAWAII 'Q C 2D° ~ N KOHALA 19°-~ ~C ~ F 4 ly q ti M q k U CO KOHALIP 1~• I / q S MOUNTAINS ~ \~1 I /i~ T o MAUNA KEA ~~%i ~~~~I~~,~~~ HILO ~.\I\161.; HUALAIAI ~r~`\a\~,~ 1111 l l%/////y KAILUA- „ PUNA KONA \ ` ~ D v MAUNA LOA - I/~~ PROJECT ~ ~ ~ ~•'I/~ SITE ~~j~~~(~~`~~`~ KIIAUEAr;~;~~\~~ ~j`'~1111111\\~ ,I, '/~~ili~~1~'I,~\\\ KA~U PrAHALA SOUTH PT. ALIT DRIVE SHORE PROTECTION KAILUA-KONA, ISLAND OF HAWAII LACATION MAP to o l0 20 SCALE IN MILES U. S. ARMY ENGINEER DISTRICT, HONOLULU 3 RGURE 1 11 Q p 1t ~ 0 Il; _ W t" 11~1~0~ ~ Contractor's S rog~ rea ~ ~1~~ ( not to scsl e 1 / ~ o~ p V D U O ~ OO o C~ ° Q , J \ KC~lua Bay O ~ \ . ~ +''s \ ~ / 3 /SAD YIEYN l ~ ~f. ~ PROJECT LIMITS f ai IUQ Pi2~" HAUL ROUTE i j/ zoo ao o xoo .oorr oQ a ALIT DRIVE SHORE PROTECTION KAILUA-KONA, ISLAND OF HAWAII PROJECT AND STORAGE AREA LOCATION U.S. ARMY ENGINEER DISTRICT, HONOLULU 4 FIGURE 2 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii (2). Winds, Storms, and Waves. (a) Winds. Trade wind conditions dominate the weather pattern in the Hawaiian Islands, resulting in partly cloudy skies throughout the islands and causing brief showers to prevail in the mountain and windward regions of the islands. From May through September, the trade winds are prevalent about 80-95 percent of the time. From October through April, the frequency decreases to 50-80 percent. Because the western coast is sheltered from the trades by high mountains, land and sea breezes are dominant. Additionally, the diurnal cycle consists of upslope winds during the day and downslope winds during the night. Strong trade winds may sweep through the saddle between the Mauna Kea and the Kohala Mountains and reach the areas to the lee (U.S. Geological Service National Water Summary 1988-89). (b). Storms. Storms are relatively infrequent and usually result from a breakdown of the normal circulation of the trade winds. Storms typically occur from October to April; however, local convective storms, which are intense and of short duration, can occur at any time of year. Three classes of disturbances produce major storms in the Hawaiian Islands: cold fronts, low pressure passages, and true tropical storms or hurricanes. Cold fronts, which occur annually from one to eight times during the winter, cause intense rainfall and strong, gusty northwest winds. Low pressure storms, called "Kona" storms, also occur during the winter months. These storms are characterized by strong, persistent southerly and southwesterly winds and intense rainfall. Hurricanes are infrequent, but tropical storms having winds below hurricane force are more prevalent and pass close to the Hawaiian Islands on the average of once every three years. Tropical storms which pass close to the Hawaiian Islands cause high surf conditions, typically during the months of July through November. The major hurricanes which recently affected the State of Hawaii were: Maximum Winds Property Islands (m.p.h.) Damage Name Date Affected Sustained/Gusts (Mil Hiki Aug 15-17, 1950 Kauai 68 / NA 0 2 Nina Dec 1-2, 1957 Kauai 92 / NA 1.1 Dot Aug 7, 1959 Kauai 81 / 103 11.5 Fico Jul 18-20, 1978 Hawaii NA / 58 0.2 Iwa Nov 24, 1982 Kauai, Oahu 65 / 117 308.0 Estelle Jul 22, 1986 Maui, Hawaii NA / 55 2.0 Iniki Sep 11, 1992 Kauai, Oahu 145/ 175 1800.0 (c) Waves. The waters off the project area are generally calm; however, the coast is exposed to direct wave 5 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii attack by large storm waves from the south and southwest. Of particular concern are both the waves associated with Kona storms, which approach from the southwest or west with periods ranging from 8 to 10 seconds and heights from 10 to 15 feet, and the large southern swells with periods of 14 to 22 seconds. (3) Tides. The following tidal information was obtained from the US Coast and Geodetic Survey data at Kailua Bay and are referenced to a datum of mean lower low water: Kailua Bav Feet Highest tide (estimated to nearest 0.5 ft) 3.5 Mean higher high water (mhhw) 2.1 Mean high water (mhw) 1.6 Half tide level (htl) 0.9 Mean low water (mlw) 0.2 Mean lower low water (mllw) 0.0 Lowest tide (estimated to nearest 0.5 ft) -1.0 (4). Geology. (a) The Hawaiian Islands are a chain of broad, shield- shaped, basalt domes built on a 1,600 mile long fissure in the ocean floor. The Island of Hawaii is the largest, youngest, and southernmost of the chain. It is formed from thousands of thin lava flows from vents in rift zones (zones of fractures in the earth's mantle) from five volcanoes: Mauna Loa, Mauna Kea, Kilauea, Hualalai, and Kohala. The island consists entirely of the slopes of these mountains and of the broad saddles between them. Mauna Loa and Kilauea, which occupy the southern half of the island, are still active. (b) Lava flows from Hualalai, a volcano on the west side of the island, formed Kailua Bay. The composition and fresh condition of Hualalai's lava indicates that the volcano erupted contemporaneously with its two larger neighbors, Mauna Kea and Mauna Loa. Based upon lava analysis of its most recent flows (during 1800 and 1801), which are located to the north of Kailua Bay, Hualalai is now in a late stage (perhaps nearly dormant) of the volcanic cycle. (c) Kailua Bay is crescent-shaped and is closed on its north end by a large concrete pier. Nearshore, the bay floor slopes gently seaward with a stair-stepped bathymetry created by successive flows of lava basalt which occurred about 4000 years ago. Within this sloping bay floor is a four-foot diameter open lava tube which discharges fresh water into Kailua Bay. (d) Ranging from about 150 to 200 feet offshore and at a depth of about 20 feet, the bay floor levels off to a sand- covered ledge. The sand layer's thickness is not known. The sand 6 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii is fine-grained and is similar in size and composition to the sand of the pocket beach next to the pier. The similarity of the two sands suggests that the bay floor sand is the sand which, during the last several decades, has eroded from the former beach areas along the bay's shoreline. (5). Seismicity and Tsunamis. (a) The Island of Hawaii is situated within a seismically active zone and straddles the boundary between seismic Zones 3 and 4. Earthquakes of low or moderate magnitudes occur year-round and are usually associated with the volcanic activity of Kilauea and Mauna Loa. (b) The Hawaiian Islands are subjected to tsunamis generated by both local and distant seismic disturbances. The following is a list of major tsunamis affecting the Hawaiian Islands: Height Damage Date Origin (feet) (mil April 1, 1946 Aleutian Islands 55.8 26.0 November 4, 1952 Kamchatka 20.0 1.0 March 9, 1957 Aleutian Islands 52.5 5.0 May 22, 1960 Chile 34.5 23.0 March 27, 1964 Alaska 15.7 0.1 November 29, 1975 Puna, Hawaii 48.0 3.1 (c) There is no specific wave run-up height data for Kailua Bay with respect to the above events; however, data for the coastline to the south is available, as indicated in Figure 3. Figure 4 indicates that the Federal Emergency Management Agency's determination of Kailua Bay's Base Flood Elevation is 10 feet for the 100-year flood event. (6) Water Quality. The State of Hawaii Department of Health (DOH) regularly samples the water of Kailua Bay. There are five sampling stations as shown on Figure 5. Stations 1204 and 1205 are closest to the project area, and the data from these two stations will be used to develop a baseline for the project area. Since 1990 a total of 31 parameters have been sampled; however only a few of those have State standards. For Station 1204, most physical perameters were not measured after 1992; however biological parameters and salinity continue to be monitored. Except for pH, station 1204 met State standards for the physical parameters from 1990-1992. Between 1990-1995 the "running geometric mean" exceeded the State standard for enterococci 17 times (See footnote below). For Station 1205, physical parameters as well as biological parameters continue to be collected. From 1990 through 1995 all the physical parameters met applicable State 7 156.00' Koi/uo Boy N HAWAII 1 HOLUALOA e Ho/ua/oo Boy 8,_,_,8 t GEND j 19.35' b ti ~ o I ?QpgS ,qh `qb 10 Koho/uu Bay ~ Map Plate taken from 'Tsunami Wave Runup Heights in Hawaii' • by Harold G. Loomis, University of Hawaii, May 1976 13, 3, 7,12 156.00' Koukoloelae Pt. KEAUHOU ~l 19.3= 0 1 t ~ ' MILES Moihi Boy N ALIT DRIVE SHORE PROTECTION KAILUA-KONA, ISLAND OF HAWAII TSUNAMI WAVE RUNUP HEIGHTS, KONA COAST U.S. ARMY ENGINEER DISTRICT, HONOLULU FIGURE 3 8 F. ,~roi - ZONE ;C \ Culvert . 1' / ~ V.~. ~NC l.` X61 ~l%4 Q ZONE AE a° ~ U ~ ° 1 m S c? ~ ~ ZONE X s° A 'sue . ~ . ~ ~ ZONE X ` u` ° - . ~ o ~ ~ neaps [ ~c° g u''-ZONE X , \ ~O \ 3q - ~ ZONE r 9' \ -r A 10 oC0E55 ROAD y ,m ~ / ./KAHIKINA l?.NE J9'I"/n, ~~L~ - . , r., ~ ~ N, ~o a`y ' f1, `'o/ 0165 A ~ ZONE AE Rono ~ ~ - o ZONE AE ,Qato ~ \5 ~ o li~lLC:9 BAY \ SAa ^ 9\ ~ n II ~~~,N/ ~ o~0.oPOp ~ ZONE X Q STUDY LIMITS) ~ l ~ _ v a ~ r ~ ~ _ m ~ ~ ~ .H~jp`?~ ~ , ' ~ ~ P ZONE y;,,,,, ZONE VE \ X ~ ' ZONE Om Luvr \ se • ~ = ?O Underground Conduit ~ ~ ~ C ~ ZONE VE \ . Q ro 4 APPROXIMATE SCALE IN FEET \ soo o soo ALIT DRIVE SHORE PROTECTION ONEO BAY KAILUA-KONA, ISLAND OF HAWAII Map taken from Federal Emergency Management Agency Flood Insurance Rate Map, Hawaii County, WAVE INUNDATION AREAS Hawaii, Panel 713, Revised September 16,1 sea. FOR 100-YEAR FLOOD, - Zone AE has base flood elevations determined. KAILUA, HAWAII Base flood elevation lines era in feet. U.S. ARMY ENGINEER DISTRICT, HONOLULU g FIGURE 4 .-I N ~ LL Z¢ Z ~ O~ W O z Q U ~ Q S li p O ~ ~ ~ _ U Q _ ~ ~ a Z Q Z V~i oo Q ~ ~ J O a r d ~ w ti Q > O O ~ N ~ ca ~ ~ W o ~ ~ ~ Q _o Q Y (n ~ T o ~ ui p n ~ 47 ~ Z ~ OO ~J N _ 1- U ~ F- ~ O ~ ~ O W Za L C ~ ~ ~ aX ~ O a Q OC i~~a ~ ~ t~ Q ~ o / •-o O O O O H 'bMd~S r ~ ~ o a W W o} u O Q 0 10 CEPOD-ET-PP Jctober, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii standards and the enterococci standard was usually met; only 2 "running geometric means" exceeded the State standard (see footnote 1 below) (personal communication, DOH-CWB, 1996)." (7) Air Quality. The air quality in the State of Hawaii is good, and State and Federal standards are very seldom exceeded. There was no State sampling station on the Island of Hawaii prior to 1995, and data from the newly established station in Hilo is not yet being published or made available by the DOH Clean Air Branch (pers. comm. CAB, 1996). State-wide, of 9,316 air samples obtained between 1991-1993 only 1 exceeded Federal standards (PM-10) and only 21 exceeded State of Hawaii Standards which are generally more stringent, with 16 of those exceeding the State ozone standard at the Sand Island, Oahu sampling station (DOH-CAB, undated). Air pollution episodes are experienced on the Island of Hawaii periodically from volcanic eruptions. Particulates increase due to the eruption and forest fires caused by the lava flows. Substantial increases in the concentrations of mercury and sulfur dioxide have been recorded during eruptions (Decker, 1987). In the future the new DOH sampling station in Hilo will be able to document air quality perturbations caused by volcanic eruptions for some parameters. (8) Noise. The major noise in the project area is from vehicles and waves crashing against the sea wall. There are no substantial sources of industrial noise in the vicinity. c. NATURAL RESOURCES. (a) Terrestrial Resources The seawall, its large boulder foundation, and the adjacent sidewalk and road comprise the shoreline of the study area. Accordingly, there are no trees, shrubs, or other substantial terrestrial flora or fauna resident along this portion of the shore. (b) Marine Resources The substrate of the near shore along the project reach is generally devoid of living coral, and consists mainly of cobble-size rubble. Common Hawaiian reef fishes occur through out Kailua Bay, including Chromis agilis, Acanthurus triostegus, Acanthurus nigrofuscus and Abudefduf abdominalis which are generally abundant, and Thallassoma duperrey, Zebrasoma flavescens and Naso Iiteratus are also common. Common sea urchins such as Tripneustes gratilla, Heterocentrotus mammillatus and Echinometra mathaei are abundant in the bay, as The Department of Health's sampling protocol does not meet the timing requirements specified for determining compliance with the Water Quality Standards. Instead, a "running geometric mean" is maintained, recomputed when each new sample is added to the data base. 11 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii are the common green, brown and red algae species. There are no significant marine resources resident in the immediate project area, although the seawall is a popular place to fish for halalu (juvenile Trachurops crumenophthalmus) and oama (juvenile goat fish) during their seasonal runs. (c) Endangered and Threatened Species. No candidate, proposed or listed endangered or threatened terrestrial species are known to inhabit the study area. Threatened green sea turtles (Chelonia mydas) are common in Hawaiian waters including in Kailua Bay. Endangered humpback whales (Megaptera novaengliae) are resident in the waters of West Hawaii during the winter breeding and calving season (December thru May). Endangered hawksbill turtles (Eretmochelys imbricata) and endangered Hawaiian monk seals (Monachus schauinslandi) are rarely seen in the waters of the main Hawaiian Islands. d. CIILTURAL RESOURCES Neither the State nor the National Registers of Historic Places (RHP) list any historic properties within the potential area of effect of the proposed project; however, two historic properties are located in close proximity to the seawall: Hulihee Palace (50- 10-28-7001) is situated immediately south of the seawall and Mokuaikaua Church (50-10-28-7231) is located southeast and inland of the Kailua Bay. A third historic property, the National Landmark Kamakahonu, Residence of King Kamehameha I (50-10-28- 7002), is located northwest of Kailua Bay. A significant archaeological site, considered likely to be eligible for listing on both the State and National RHPs may also be extant within the project area, most likely lying beneath the seawall, sidewalk and roadway. The site, designated as Pa a Umi, has been described as the habitation site of the traditionally important ali'i 'Umi-a- Loloa. This site, as depicted on a number of early 19th century maps, was situated on a basalt promontory located near the middle portion of Kailua Bay. e. RECREATION The principal recreational facilities in the area are the pier to the west of the seawall, the small pocket beaches on both the east and west ends of the seawall, and the seawall itself. The pier provides a docking facility for tour and fishing boats. Swimmers, particularly those who swim the length of the bay as a physical fitness activity, use the small pocket beaches as a point of entrance and exit from the bay. Some fishing, primarily to catch small bait fish and the seasonal runs of halalu and oama, takes place from the seawall. 12 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii f. ECONOMICS Tourism is the dominant economic activity in the North Kona district of the Big Island. Thousands of visitors spend at least part of their vacations in North Kona each year and stay at one of the moderately priced hotels in the district. (1) An upscale, mega-resort region has also recently developed to the north of Kailua-Kona, an area which is referred to as the "Gold Coast." Due in part to this development, visitor counts for the Big Island have been increasing since 1988, a trend which is expected to continue in the near future. In 1990, 982,700 westbound visitors came to the Big Island, an increase of 3.8 percent over 1989, with a majority of them staying in West Hawaii. Likewise, hotel occupancy rates in Hawaii County have risen steadily since 1988. Hotels on the Big Island in 1990 were 61.7 percent full, a 0.9 percent increase over the 1989 rate. Other major economic activities in the North Kona district include agriculture (mostly macadamia nuts and coffee), cattle ranching, and construction. (2) Due to the vibrancy of the economy, especially the visitor industry, the labor market in West Hawaii is very competitive. Although Hawaii County had the highest unemployment rate in the state during 1990, businesses in West Hawaii were still faced with an acute labor shortage. At 3.8 percent, the unemployment rate was the same as in 1989 and resulted in the need for workers from the east side of the island to supplement West Hawaii's labor force. About 300 workers commute approximately 55 miles one-way daily from their homes on the east side of the Big Island to their jobs in West Hawaii. (3) A rise in the resident population has accompanied the development of tourism in the North Kona district. In 1980, 13,748 residents lived in the North Kona district. By 1990, the number of residents had increased by 62 percent to 22,284. North Kona had the third fastest population growth in the county during the decade. Major commercial establishments matured to support the growing community. This core of businesses and activities draws both residents and visitors from areas throughout the west side of the Big Island. Kailua-Kona is also host to two major international sporting events. The Hawaii International Billfish Tournament takes place off the Kona coast in July and August, and the Ironman Triathlon starts from Kailua Bay every October. Each year, these events draw hundreds of competitors and thousands of spectators who contribute millions of dollars to the economy of Kailua-Kona. 13 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii 3 THE PROPOSED ACTION AND ALTERNATIVES CONSIDERED. a. Proposed Actioa. The proposed plan of improvement consists of placing geotextile bags within the Oceanside interstices of the seawall rock foundation and pumping concrete directly into the bags. Pumping operations are expected to be conducted from Ali'i Drive. This initial phase of construction will close the larger voids and prevent escape of concrete fines into the ocean during pumping operations under the sidewalk. Due to the large diameter of the boulders which form the foundation of the seawall, it is estimated that 700 bags (2'X2'X4') will be required to fill the voids. Upon completion of this phase, the contractor will proceed to drill and grout through the existing sidewalk along Ali'i Drive. A cement-aggregate grout will be injected into the existing seawall rock foundation at approximately 7' intervals along the existing sidewalk. The exact interval will depend upon the stiffness of the grout mix and an on-site determination of the degree to which the grout fills the voids. The interstices will be filled with grout as the injection pipe is slowly withdrawn. The hardened grout will provide stability to the seawall Foundation and form a concrete curtain to prevent the further erosion of the fine-grained subgrade material underlying the existing sidewalk due to wave/current action. The contractor will be required to develop a detailed plan for providing an effective temporary ocean side barrier to the spread of turbidity before commencing the concrete operations. A stylized drawing of one possible plan is shown in Figure 6. All known utilities including an existing 24" storm drain and outlet and the abandoned gas pipes have been identified and verified by field observations and as-built drawings. The contractor's storage area will be located in an area off Pawai Place, under the jurisdiction of the Department of Public Works (Figure 2) regardless of the alternative chosen. b. No Action (Alternative A) The "no action" alternative is not considered an acceptable or feasible solution to the problems and needs of the study area, since the "no action" alternative neither solves the identified problems nor fulfills the identified needs of the study area. Under this alternative, the stability of Ali'i Drive would continue to deteriorate due to continued erosion, resulting in further damages to the road, its adjacent seawall, and the sidewalk, disrupting the traffic and businesses along the road. c. Toe Protection Structure (Alternative 8) A sloping rock toe protection structure is a viable alternative for Kailua Bay, as this alternative would arrest the erosion process from occurring behind the wall and would stabilize the seawall relative to its potential to overturn. Under this alternative, the 32-foot section of the seawall that has begun to shift must be repaired. 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Secondary considerations were each alternative's ability to provide both further stability to the wall and overtopping protection. (2) Alternative C (Revetment) was removed from consideration due both to its high cost and to the social unacceptability of disrupting the area's view plane. Alternative D (Geotextile) would solve the problem due to erosion; however, its short life expectancy and the potential impact to cultural resources during excavation make this alternative less desirable. Alternative E (Beach) would arrest the erosion process, would protect the seawall's foundation, would provide protection against overtopping, and would provide recreational benefits; however, its high construction cost, its high maintenance cost, and the high degree of uncertainty regarding the beach's stability make this alternative both technically and economically infeasible. Similarly, Alternative B (Toe Protection) would arrest the erosion process, would protect the seawall's foundation, and would lessen the degree to which overtopping occurs; however, this alternative is not as desirable economically and environmentally as the Proposed Action. The Proposed Action would arrest the erosion process and would stabilize the seawall's foundation, although it provides no reduction in overtopping. In addition it will have no significant impact on ecological and cultural resources and is the most economically feasible alternative. 4. ENVIRONMENTAL CONSEQUENCES OF PROPOSED IMPROVEMENT. a. Environmeatal Settiag. The proposed action modifies an existing seawall and would not change the environmental setting. Reinforcement of the seawall foundation would increase the integrity of the shore protection structure against failure for the foreseeable future. b. Terrestrial Resources. The proposed project would have no effect on terrestrial resources. c. Marine Resources. The proposed project is not expected to have any significant impacts on the marine environment. Depending on the timing of construction and the annual runs of halalu and oama, fishing for these popular fish from the seawall may be disrupted. d. Endangered and Threatened Species. There are no anticipated impacts on any candidate, proposed, or listed species. There are no such terrestrial species in the project area. Endangered humpback whales reside in Hawaiian waters during their winter breeding season. Threatened green turtles and endangered 17 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii hawksbill turtles are present in the nearshore waters of Hawaii. It is unlikely, however, that the proposed grouting of the existing seawall will have any effect on these species. The National Marine Fisheries Service concurred with this opinion (personal communication, NMFS, 1996). e. Water Quality. The grouting operation may temporarily affect the water quality in the immediate vicinity of the seawall foundation; however, the major constituents of the cement grout, CaO (lime) and SiO2 (silica), would readily precipitate in seawater as carbonates and would have little or no effect on marine organisms. Pressure jetting the silt and sand from the voids between the foundation boulders will temporarily cause turbidity in the immediate vicinity, but silt containment devices will be used to limit the effects to the immediate vicinity. No long-term effects on water quality are anticipated under any of the project alternatives. A State of Hawaii 401 Water Quality Certification or waiver will be obtained prior to commencement of construction. f. Air Quality, Noise, and Traffic. Exhaust gases from construction equipment may cause a temporary reduction of air quality at the project during construction. There may be some generation of dust near the construction area resulting from transport and handling of construction materials. There would be temporary, localized increases in ambient noise due to operation of heavy equipment during project construction. Construction activities would cause temporary interference with traffic flow along Ali'i Drive; however, project construction would reduce the possibility of total road closure due to failure during the next severe storm. g. Cultural Resources. The drilling portion of the proposed project will disturb the top two feet of the soil material immediately behind the seawall. This material, however, is believed to have been previously disturbed during the construction of the seawall and the sidewalk. No adverse effect to historic properties is expected as long as the mechanized construction equipment is restricted to areas landward of the seawall, there is no subsurface disturbance of the sand deposits (pocket beaches) at either end of the seawall, and there is no excavation along the seawall, particularly in the middle sections where 19th century maps designate Pa O 'Umi. In reaching this conclusion HED solicited comments from 22 Native Hawaiian and other civic groups and individuals, as well as the National Park Service and the State Historic Preservation Office (SHPO). The SHPO concurred with our determination that there would be no adverse effect to historic properties. At the request of the SHPO an informative plaque will be placed on the seawall after completion of construction. 18 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii An Archaeological monitor will be present on site if any subsurface disturbance below the level of the foundation stones is required in association with repair of the seawall. If archaeological remains, structures or objects are found during construction, the State Historic Preservation Office will be notified and appropriate mitigative measures will be implemented. h. Recreation. During construction, noise and possibly airborne dust may present a minor nuisance to recreational activities using the pier or seawall. No long-term impacts on recreational activities would result from the proposed project. i. Coastal Zoae Program Consistency. HED has determined that this project is consistent with the State's approved Coastal Zone Management Program. The State of Hawaii's concurrence with this determinatio or waiver will be obtained before construction commences. j. Section 122 Effects. Section 122 of the River and Harbor Act of 1970 supplements the provisions of the National Environmental Policy Act of 1969 by requiring that all Corps projects consider at least 17 special, possibly adverse economic, social and environmental effects relating to any proposed project; the cost of elimination or minimizing such adverse effects; and the need for flood control, navigation and associated actions. The minimum list of 17 "effects" includes desirable regional growth, employment/labor force, local government finance, business and industrial activity, displacement of people or farms, desirable community growth, population, public services, public facilities, community cohesion, aesthetic effects, noise/air pollution, water pollution, natural resources, and man-made resources. The last five of these categories are discussed above. For the remaining categories, project effects are expected to be neutral or positive. k. Mitigation Recommended. (1) Care will be exercised to insure that no contamination of the marine environment results from construction activities. Actions to be taken to avoid water quality impacts should include measures which insure that no debris, petroleum products or other deleterious material is allowed to fall, flow, leach or otherwise enter the water. (2) Construction activities will be confined mainly to the shoreline area with little in water work. As far as is practicable, feasible and necessary, any work in the intertidal zone will be conducted during low tide conditions to minimize turbidity effects. 19 CEPOD-ET-PP October, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii (3) Silt containment devices will be deployed during any work in the water. (4) The contractor will be required to periodically monitor selected water quality parameters (5) An archaeological monitor will be present on site during any excavation or subsurface disturbance below the level of the foundation stones that is required in association with repair of the seawall. The State Historic Preservation Office will be notified and appropriate mitigative measures will be implemented should any unanticipated discoveries occur during construction. 5. AGENCIES AND PERSONS CONTACTED. a. Federal Agencies Hawaii's Congressional Delegation U.S. Fish and Wildlife Service National Marine Fisheries Service National Park Service U.S. Coast Guard Western Pacific Regional Fishery Management Council U.S. Advisory Council on Historic Preservation Department of Interior, Regional Environmental Officer U.S. Geological Survey b. State of Hawaii Agencies Office of State Planning Department of Land and Natural Resources Department of Health Office of Environmental Quality Control Office of Hawaiian Affairs University of Hawaii, Sea Grant Extension Service University of Hawaii, Environmental Center University of Hawaii, Look Laboratory c. County of Hawaii Agencies Mayor, Hawaii County County Council Department of Public Works Planning Department d. Private Organizations and Individuals Life of the Land Hawaii Audubon Society The Outdoor Circle Hawaii Island Environmental Council 20 CEPOD-ET-PP )ctober, 1996 SUBJECT: Environmental Assessment for Ali'i Drive Shoreline Protection, Kailua-Kona, Island of Hawaii, Hawaii Bishop Museum Save Our Surf Na Ala Hele Hawaii Leeward Planning Conference Sierra Club Hawaii's Thousand Friends Protect Kohanaiki Ohana The Ocean Recreation Council of Hawaii (TORCH) Kona Hawaiian Civic Club Ka Kahui Hawaii Mr. Ed Lapenas Mr. John Tommy Rosas, Jr. Mr. Rick Gaffney Mr. Douglas Blake Mr. Nelson Ho A. Eaton Ms . Pat Tummons Mr. Mark K Crawford Mr. Yukio Shiigi Mr. Jerry Rothstein Ms. Donna Mah 8. REFERENCES CITED Decker, Wright and Spaffer, Eds., 1987. Volcanism in Hawaii, U.S.G.S Professional Paper No. 1350, Vol. 1., Chapter 35, 1987. U.S. Superintendent of Documents Hawaii, State of, Department of Health, Clean Air Branch (CAB), undated. Hawaii Air Quality Data 1991-1993. Honolulu, HI. Hawaii, State of, Department of Health, Clean Air Branch (CAB), 1996. Phone conversation with CAB staff, 11 Apr. 1996. Honolulu, HI. Hawaii, State of, Department of Health, Clean Water Branch, personal communication, 1996. Computer printout from water quality database, 10 Apr. 1996. Honolulu, HI. National Marine Fisheries Service, personal communication, 1996. Discussion with Eugene Nitta, Protected Species Coordinator, 2 May, 1996. Honolulu, HI. 21 APPENDIX A COMPLIANCE DOCUMENTS , DEPARTMENT OF THE ARMY U. S. ARMY ENGINEER DISTRICT. HONOLULU • FT. SHAFTER, HAWAII 96858-5660 REVLrTO May 25, 1995 ATTENTION OF Planning Division Mr. Michael Wilson State Historic Preservation Officer Department of Land and Natural Resources P.O. Box 621 Honolulu, Hawaii 96809 Dear Mr. Wilson: The U.S. Army Corps of Engineers, Honolulu District, in response to your Department's historic preservation comments dated June 14, 1994, has completed its efforts to consult with native Hawaiian groups, individuals and interested parties regarding the potential effects of proposed construction improvements to the existing 700-foot long concrete seawall fronting Kailua Bay, Kona, Hawaii Island and adjacent to Alii Drive, and the significant structure known as Pa o'Umi. Letters requesting comments to this proposed undertaking were sent to 22 groups, individuals, and agencies who were identified in discussions with the federal National Park Service, state Office of Hawaiian Affairs and Daughters of Hawaii. Letters received from four respondents endorsed your recommendations for an interpretive marker and archaeological monitoring during construction. The Daughters of Hawaii have indicated their willingness to be responsible for an interpretive sign/marker provided the Corps and State Department of Land and Natural Resources assist with its placement, or accuracy of location. We request your finalized comments and concurrence pursuant to 36 CFR Sections 800.4 and 800.5 of the regulations of the President's Advisory Council on Historic Preservation, and your letter of June 14, 1994, that this proposed undertaking for seawall repair at Kailua Bay, Kona, Hawaii Island, will have No Adverse Effect on Pa o 'Umi , an identified historic property significant as a traditional Native Hawaiian cultural place and associated with the traditional political history of the Hawaiian Islands. Thank you for your timely response in order that we may proceed to finalize the dEA and dFONSI and fulfill all historic preservation stipulations. Should you have any further questions A-1 . -2- or comments, please feel free to contact Mr. Farley K. Watanabe of my planning staff at 438-7007 . Sincerely, Ray H. Jyo, P .E . Director of Engineering Enclosures A-2 lEMJAMIN J. CAYETANO MIONAE~D. WIIWN, CNAPPWOM • O`UVERNOR OF HAWAII ~ ~ : WARP OF LAND AND NATUIIK REWURCEC •a4l DEPUTY I dLFFAT COLOMA•AOARAN S` ~re-O'~>, AOYACULTVRE DEV60PMfNT PIIOdIM1 STATE OF HAWAII AOUwne REWUROEt CONSFAVAnON AND DEPARTMENT OF LAND AND NATURAL RESOURCES DmRDNNENTAL AFFAIRs CONSERVAmON ANO STATE HISTORIC PRESERVATION D(VLSION REWWICES ENfORCEMFNT June 22, 1995 33 SOUTH KWO STREET, 6TH FLOOR CONVfl'ANOES HONOLULU, HAWAII 9661 FORESTRY AND WRDUfF IIISTONC PIIESERVAnON OM90N LAUD MANAOEfAFNT RATF PARIU Mr. Ray H. Jyo, P.E. WATER AND LAND DEVELOPMENT Director of Engineering U.S. Army Corps of Engineer District, Honolulu Department of the Army Ft. Shatter, Hawaii 96858-5440 LOG NO• (4750 DOC ~`n_ 9505Rr45 Dear Mr. Jyo: SUBJECT: Construction Improvements to the Se:Ewall Fronting Kailua bay along; Ali'i Drive . Multiple Ahupua'a. North Kona, Hawuii Thank you for your letter of May 25, 1995, in which you document your attempts to consult with native Hawaiian groups and individuals regarding the potential effects of this project. We find that you have made an excellent eftirrt w contact a wide range of groups and individuals. The respondents supported our office's recommendations fix an interpretive marker and nrchaev>lugical monitoring in the Pao 'Umi area. Thus, we agree with your "no adverse effect" determination, with the understanding that this will involve [he monitoring and interpretive marker. We would like to reyuest that our office he able to comment tin the text fix the marker and its general appearance. Related to this prciject, we would like to note that the recent high surf which impacted the Ali'i Drive seawall severely damaged the seawall extension fronting the adjacent Hulihee Palace, an extremely significant historic site on the National Register of Historic Places since 1973. We understand that Corps of Engineers staff visited the palace immediately after the damage and assessed the situation. We would like [o request that, it at all possible, your seawall study and improvements also he extended a bit longer to include the seawall fronting the Hulihee Palace. Improving that seawall as an extension of the hay's seawall would do a great service to the Kona community and Hawaii and our visitors by better protecting this important site. Aloha, ~ - HIBBAR0. Deputy , State Historic Preservation Officer RC:jk - . c: Fanny Au Huy, Curator, Hulihee P;dace `3 - - h' Rep. Virginia Isbell, Hawaii State Legislature - - . A-3 P CONVER£ ION RECORD DATE . x:00 2 May, 1996 TYPE ROUTING VISIT ~ CONFERENCE ~ TELEPHONE INCOMING NAME/SYMBOL INT o~,u,. ,r v.:~vc,.r....~.National Marine Fisherie Service ~ OUTGOING AME OF PERSON(S) CONTACTED OR ORGANIZATION ELEPHONE NO. IN CONTACT WITH YOU NMFS Eugene Nitta, Protected Species Coord. 973-2987 SUBJECT Ali'i Drive Shore Protection Project Informal Consultation - EndangeredlTheatened Species SUMMARY I discussed the Ali'i Drive project with Gene, and asked him if a letter from the Corps had been received in the past concerning this project. He indicated none had, and due to the nature of the project, he did not believe a letter was needed because there would be no effect on either whales or turtles. I said I would document our conversation as an "Informal Consultation" using an Optional Form 271, Conversation Record, and Gene concurred that would be adequate. ACTION REQUIRED Place a copy of this form in the Environmental Assessment NAME OF PERSON DOCUMENTING CONVERSATION S G ATURE DATE WILLIAM B. LENNAN, II ~l~~ld~~9~?.~ - 3 May, 1996 ACTION TAKEN SIGNATURE TITLE DATt 502]1-tOt U_5. G.P.O. 1983Ax<-3]8 CONVERSATION RECORD OPTIONAL FORM vi (12-7s1 DEPARTMENT OF DEFENSE A-4 EVALUATION OF THE EFFECTS OF THE DISCHARGE OF DREDGED OR FILL MATERIAL INTO THE WATERS OF THE UNITED STATES USING THE U.S. ENVIRONMENTAL PROTECTION AGENCY SECTION 404(b)(I) GUIDELINES ALIT DRIVE SHORE PROTECTION PROJECT, HAWAII, HAWAII PODCW96-0004 2 October, 1996 I. PROJECT DESCRIPTION. a. Ali'i Drive, Kailua-Kona, Island of Hawaii, Hawaii b. General Descri to ion: The U. S. Army Corps of Engineers, Honolulu Engineer District, and the County of Hawaii, Department of Public Works are proposing to repair a section of Ali'i Drive. During the early 1950's, the owners of the propoerties on Ali'i Drive fronting Kailua Bay built a concrete recurved seawall, approximately 700 feet long. The wall rests on a foundation of large boulders having an average diameter of about 5 feet, with steel sheetpile behind the boulders and beneath the sidewalk. The beach which was seaward of the wall has since eroded, exposing the boulder foundation to constant wave action. The soil material behind the wall, which forms the foundation for both the sidewalk and the roadway adjacent to the wall, has eroded during the past two years, presumably due to the corrosion of the steel sheetpile over time. This erosion of the foundation materials has caused cracking and large potholes in the roadway pavement and has caused the sidewalk to crack and fail in several locations. Furthermore, one section of the wall has started to shift, apparently due to a related shift in the underlying boulders. The proposed plan of improvement consists of placing geotextile bags within the Oceanside interstices of the seawall rock foundation and pumping concrete directly into the bags. Pumping operations are expected to be conducted from Ali'i Drive. This initial phase of construction will close the larger voids and prevent escape of concrete fines into the ocean during pumping operations under the sidewalk Due to the large diameter of the boulders which form the foundation of the seawall, it is estimated that 700 bags (2'X2'X4') will be required to fill the voids. Upon completion of this phase, the contractor will proceed to drill and grout through the existing sidewalk along Ali'i Drive. Acement-aggregate grout will be injected into the existing seawall rock foundation at approximately 7' intervals along the existing sidewalk. The exact interval will depend upon the stiffness of the grout mix and an on-site determination of the degree to which the grout fills the voids. The interstices will be filled with grout as the injection pipe is slowly withdrawn. Several alternatives to the proposed action were considered, however all would have had more adverse effects on the environment; some were cost prohibitive; and none were considered acceptable enough to be considered in detail. See attached Environmental Assessment for details. A-5 I. PROJECT DESCRIPTION (Continued) c. Authori and Purpose: Section 404 of the Clean Water Act (33 U.S.C. 1344); and Section 14, Flood Control Act of 1946, as amended. The purpose of the project is to repair the seawall which protects Allii Drive. d. General Descriptions of Dredged or Fill Materials: (1) General Characteristics a. Clean sand-cement grout of the Material with Bentonite b. Geotextile bags (2) Quantity of Material to a. 2,OOOCY be Discharged b. 700 d. General Descriptions of Dredged or Fill Materials: (Continued) (3) Source of the Material a. Commercial source e. Description of the Proposed Discharge Site: (1) Location (Enclosure 1) Kailua-Kona, Hawaii, Hawaii (2) Size (acres) Less than 1 acre (3) Type of Site Urban (4) Type (s) of Habitat Intertidal and fastland (5) Timing and Duration The project will start construction in 97, and construction will take approximately 2-3 months. f. Description of Disposal Method: (1) Method of Discharge Fill material (grout) will be placed by grout pumping equipment II. FACTUAL DETERMINATIONS a. Physical Substrate Determinations: (1) Substrate Elevation Varies up to 2.5 ft. deep, depending on stage of the tide (2) Sediment Type Sandy silt, cobbles (3) Dredged/Fill Material NA Movement (4) Physical Effects on None expected Benthos A-6 a. Physical Substrate Determinations: (Continued) (5) Other Effects There will be temporary increases in noise, dust and engine exhaust emissions during construction. (6) Actions Taken to General mitigation recommended is as Minimize Impacts follows: (a) No construction materials will be stockpiled in the marine environment. (b) All construction-related materials will be free of pollutants. (c) No contamination of the marine environment will result from construction activities. (d) The project Contractor will be required to conform with state air quality, noise and water quality standards. (e) Silt containment devices will be deployed around the construction area to contain leaking grout b. Water Circulation. Fluctuation and SalinitX Determination: (1) Water, Effects on: (a) Salinity No effect (b) Water Chemistry No effect (c) Clarity Likely improvement over existing conditions following construction due to reduced erosion (d) Color No effect (e) Odor No effect (f) Taste No effect (g) Dissolved Gas Levels No effect (h) Nutrients No effect (2) Current Patterns and Circulation (a) Current Patterns No effect (b) Velocity No effect A-7 b. Water Circulation. Fluctuation and Salinity Determination: (Continued) (c) Stratification No effect (d) Hydrologic Regime No effect (3) Normal Water No effect Level Fluctuations (4) Salinity Gradients No effect (5) Actions That Will be NA Taken to Minimize Impacts c. Suspended Particulatelfurbidity Determination (1) Expected Changes in Likely decrease following construction Suspended Particulate due to reduced erosion and TurbidiryLevels in Vicinity of Disposal Site (2) Effects (degree and duration) on Chemical and Physical Properties of the Water Column (a) Light Penetration No effect (b) Dissolved Oxygen No effect (c) Toxic Metals & No effect Organics (d) Pathogens No effect (e) Aesthetics No effect (3) Effects on Biota (a) Primary Production, No effect Photosynthesis (b) Suspension/Filter No effect Feeders (c) Sight Feeders No effect (4) Actions Taken to Silt containment devices may be deployed Minimize Impacts around construction area to contain possible leaking grout A-8 d. Contaminant Determination The proposed discharge will be free of contaminants. e. Aauatic Ecosystem and Organism Determination The proposed discharge is free of contaminants, so that there will be no toxic effects on the ecosystem or individual organisms (1) Effects on Plankton NA (2) Effects on Benthos No effect (3) Effects on Nekton NA (4) Effects on Aquatic No effect Food Web (5) Effect on Special Aquatic Sites (a) Sanctuaries and NA Refuges (b) Wetlands NA (c) Mud Flats NA (d) Vegetated Shallows NA (e) Coral Reefs NA (f) Riffle and Pool NA Complexes (6) Endangered and No effect Threatened Species (7) Other Wildlife No effect (8) Actions to Minimize Actions to minimize impacts of this Effects project involve location, type of material and controlling the material after discharge. f. Proposed Disposal Site Determinations (1) Mixing Zone NA Determination (2) Determination of Project will be in compliance with State of Compliance with Hawaii water quality standards for Class A Applicable Water waters. A Water Quality Certification Quality Standards under Section 401 of the Clean Water Act will be requested from the State of Hawaii Department of Health. A-9 f. Prooosed Disoosal Site Determinations: (Continued) (3) Potential Effects on Human Use Characteristics (a) Municipal and NA Private Water Supply (b) Recreational and Disrupted during construction; Commercial Fisheries No long term effects. (c) Water Related Disrupted during construction; Recreation No long term effects. (d) Aesthetics NA (e) Parks, National and NA Historic Monuments, National Seashores, Wilderness Areas, Research Sites and Similar Preserves g. Determination of No Effect Cumulative Effects on the Aquatic Ecosystem h. Determination of No effect Secondary Effects on the Aquatic Ecosystem A-10 FINDINGS OF COMPLIANCE WITH THE RESTRICTIONS ON DISCHARGE FOR THE ALIT DRIVE SHORE PROTECTION PROJECT 1. No significant adaptations of the guidelines were made relative to this evaluation. 2. The use of riprap fronting the seawall was considered as an alternative to pumped grout; however, it was eliminated early in the planning process because it would not correct the current problem of voids under the sidewalk and roadway and the cost was prohibitive. The use of riprap was not analyzed in detail. 3. The discharge (leaking) of clean sand-cement grout material into the waters of Kailua Bay would not degrade water quality or human use of the water. The material is not suspected of containing contaminants; would not be expected to cause any prolonged turbidity problems; and would not degrade the aquatic environment. 4. The Proposed Action will not harm any candidate, proposed or listed endangered or threatened species or their critical habitat. 5. The Proposed Action will repair a seawall which was originally built in the 1950s. The project is water dependent and therefore no practicable alternative analysis is required. The discharge has been reduced to the absolute minimum that will meet the project objectives. 6. Additional appropriate steps to minimize potential adverse impacts of the discharge on the aquatic ecosystem include using clean grout material; and using silt containment devices to reduce or eliminate turbidity. 7. On the basis of this evaluation and the information contained in the environmental documentation for the original project, the proposed discharge site is spec'rfied as complying with the requirements of the 404(b)(1) guidelines, with the inclusion of appropriate and practicable actions to minimize pollution or adverse effects to the aquatic ecosystem. jl RALPH H. GRAVES Lieutenant Colonel, EN Commanding A-11 DEPARTMENT OF THE ARMY U.S. ARMY ENGINEER DISTRICT, HONOLULU FORT SHAFTER, HAWAII 96858-5440 DETERMINATION OF FEDERAL CONSISTENCY for ALIT DRIVE SHORE PROTECTION PROJECT AT KAILUA-KONA, HAWAII MAY 23, 1996 A-12 ASSESSMENT FORMAT RECREATIONAL RESOURCES Objective: Provide coastal recreational opportunities accessible to the public. Policies: 1) Improve coordination and funding of coastal recreation planning and management. 2) Provide adequate, accessible, and diverse recreational opportunities in the coastal zone management azea by: a) Protecting coastal resources uniquely suited for recreational activities that cannot be provided in other azeas; b) Requiring replacement of coastal resources having significant recreational value, including but not limited to surfing sites and sandy beaches, when such resources will be unavoidably damaged by development; or requiring reasonable monetary compensation to the State for recreation when replacment is not feasible or desirable; c) Providing and managing adequate public access, consistent with conservation of natural resources, to and along shorelines with recreational value; d) Providing an adequate supply of shoreline pazks and other recreational facilities suitable for public recreation; e) Encouraging expanded public recreational use of County, State, and Federally owned or controlled shoreline lands and waters having recreational value; f) Adopting water quality standazds and regulating point and non-point sources of pollution to protect and where feasible, restore the recreational value of coastal waters; g) Developing new shoreline recreational opportunities, where appropriate, such as artificial reefs for surfing and fishing; and h) Encouraging reasonable dedication of shoreline areas with recreational value for public use as part of discretionary approvals or permits by the land use commission, board of land and natural resources, A-13 County planning comissions; and crediting such dedication against the requirements of section 46-6. Check either "Yes" or "No" for each of the following questions. Yes 1Vo 1. X Will the proposed action involve or be near a dedicated public right-of-way? 2. X Does the project site abut the shoreline? 3. X Is the project site neaz a State or County park? 4. X Is the project neaz a perennial stream? 5. X Will the proposed action occur in or affect a surf site? 6. X Will the proposed action occur in or affect a populaz fishing area? 7. X Will the proposed action occur in or affect a recreational or boating azea? 8. X Is the project site neaz a sandy beach? 9. X Are there other recreational uses in the azea? Discussion 1. The action will take place along Ali'i Drive, a public road with sidewalk. 2. Ali i Drive abuts the shoreline in this location. 6. The seawall along this stretch of road and sidewalk is a populaz fishing spot, especially for children. 8. There is a small sandy beach at the east end of the project azea, but it is not expected to be affected by the project. It is used mostly by children and as an entry point for individuals training for the Ironman Triathalon. 9. There is a lot of foot traffic on the sidewalk along this reach, with people watching the charter fishing and tour boats come and go. A-14 HISTORIC RESOURCES Objective: Protect, preserve, and where desirable, restore those natural and man-made historic and pre-historic resources in the coastal zone management area that are significant in Hawaiian and American history and culture. Policies: 1) Identify and analyze significant archaeological resources; 2) Maximize information retention through preservation of remains and artifacts or salvage operations; and 3) Support State goals for protection, restoration, interpretation, and display of historic resources. Check either "Yes" or "No" for each of the following questions. Yes No 1. X Is the project site within a historic/cultural district? 2. X Is the project site listed on or nominated to the Hawaii or National register of historic places. 3. X Does the project site include undeveloped land which has not been surveyed by an azchaeologist? 4. X Has a site survey revealed any information on historic or archaeological resources? 5. X Is the project site within or near a Hawaiian fishpond or historic settlement azea? Discussion 4. There is an area, under the seawall/sidewalk/road which may be the area identified on 19th century maps as Pa o Umi, the habitation site of the traditionally important ali'i Umi-a-Liloa. 5. Hulihee Place (50-10-28-7001) is located south of the project area; Mokuaikaua Church (50-10-28-7231) is located southeast and inland; and the National Landmark, Kamakahonu, residence of King Kamehameha I A-15 (50-10-27-7002) is located northwest of the project area. None of these historic properties will be affected by the proposed project. A-16 SCENIC AND OPEN SPACE RESOURCES Objective: Protect, preserve and, where desirable, restore or improve the quality of coastal scenic and open space resources. Policies: 1) Identify valued scenic resources in the coastal zone management area; 2) Insure that new developments are compatible with their visual environment by designing and locating such developments to minimize the alteration of natural landforms and existing public views to and along the shoreline; 3) Preserve, maintain and, where desirable, improve and restore shoreline open space and scenic resources; and 4) Encourage those developments which are not coastal dependent to locate in inland areas. Check either "Yes" or "No" for each of the following questions. Yes 1~ 1. X Does the project site abut a scenic landmark? 2. X Does the proposed action involve the construction of a multi-story structure or structures? 3. X Is the project site adjacent to undeveloped pazcels? 4. X Does the proposed action involve the construction of structures visible between the nearest coastal roadway and the shoreline? 5. X Will the proposed action involve construction in or on waters seaward of the shoreline? On or neaz a beach? A-17 Discussion 5. There is a small beach at the east end of the project; however, construction will not take place on the beach, but will involve the large boulders adjacent to the beach which serve as the foundation to the seawall. a-is COASTAL ECOSYSTEMS Objective: Protect valuable coastal ecosystems from disruption and minimize adverse impacts on all coastal ecosystems. Policies: 1) Improve the technical basis for natural resource management; 2) Preserve valuable coastal ecosystems of significiant biological or economic importance; 3) Minimize disruption or degradation of coastal water ecosystems by effective regulation of stream diversions, channelization, and similar land water uses, recognizing competing water needs; and 4) Promote water quantity and quality planning and management practices which reflect the tolerance of fresh water and marine ecosystems and prohibit land and water uses which violate State water quality standards. Check either "Yes" or "No" for each of the following questions. Yes 1. X Does the proposed action involve dredge or fill activities? 2. X Is the project site within the Shoreline Setback Area (20 to 40 feet inland of the shoreline)? 3. X Will the proposed action require some form of effluent dischazge into a body of water? 4. X Will the proposed action require eazthwork beyond clearing and grubbing? 5. X Will the proposed action include the construction of special waste treatment facilities, such as injection wells, discharge pipes, or cesspools? 6. X Is an intermittent or perennial stream located on or near the project site? A-19 7. X Does the project site provide habitat for endangered species of plants, birds, or mammals? 8. X Is any such habitat located nearby? 9. X Is there a wetland on the project site? 10. X Is the project site situated in or abutting a Natural Area Reserve? 11. X Is the project site situated in or abutting a Marine Life Conservation District? 12. X Is the project site situated in or abutting an estuary? Discussion 2. The project is immediately adjacent to the shoreline. A-20 ECONOMIC USES Objective: Provide public or private facilities and improvements important to the State's economy in suitable locations. Policies: 1) Concentrate in appropriate areas the location of coastal dependent development necessazy to the State's economy; 2) Insure that coastal dependent development such as harbors and ports, visitor industry facilities, and energy generating facilities are located, designed, and constructed to minimize adverse social, visual, and environmental impacts in the coastal zone management area; and 3) Direct the location and expansion of coastal dependent developments to areas presently designated and used for such development and permit reasonable long-term growth at such azeas, and permit coastal dependent development ouside of presently designated areas when: a) Utilization of presently designated locations is not feasible; b) Adverse environmental effects are minimized; and c) Important to the State's economy. Check either "Yes" or "No" for each of the following questions. Yes No 1. X Does the project involve a harbor or port 2. X Is the project site within a designated tourist destination area? 3. X Does the project site include agricultural lands or lands designated for such use? 4. X Does the proposed activity relate to commercial fishing or seafood production? 5. X Does the proposed activity relate to energy production? A-21 6. X Does the proposed activity relate to seabed mining? Discussion 2. The project is located along the shoreline in Kailua-Kona, a populaz tourist destination on the Island of Hawaii. A-22 COASTAL HAZARDS Objective: Reduce hazazd to life and property from tsunami, storm waves, stream flooding, erosion, and subsidence. Policies: 1) Develop and communicate adequate information on storm wave, tsunami, flood, erosion, and subsidence hazard; 2) Control development in azeas subject to storm wave, tsunami, flood erosion, and subsidence hazard; 3) Ensure that developments comply with requirement of the Federal Flood Insurance Program; and 4) Prevent coastal flooding from inland projects. Check either "Yes" or "No" for each of the following questions. Yes No 1. X Is the project site on or abutting a sandy beach? 2. X Is the project site within a potential tsunami inundation area as depicted on the National Flood Insurance Program flood hazazd map? 3. X Is the project site within a potential flood inundation area according to a flood hazard map? 4. X Is the project site within a potential subsidence hazazd azea according to a subsidence hazard map? 5. X Has the project site or nearby shoreline areas experienced shoreline erosion? Discussion 1. A small sandy beach is located at the east end of the project. It is not expected to be affected by the project. A-23 2. According to the flood hazazd map for Hawaii County, Panel No. 155166 0713D, dated May 16, 1994, the project site is in Flood Zone VE, with flood elevation of 10 feet. 5. There has been erosion of the fill material under the the road and sidewalk along this portion of Ali'i Drive. This project is designed to solve this erosion problem. A-24 MANAGING DEVELOPMENT Objective: Improve the development review process, communication, and public pazticipation in the management of coastal resources and hazards. Policies: 1) Effectively utilize and implement existing law to the maximum extent possible in managing present and future coastal zone development; 2) Facilitate timely processing of application for development permits and resolve overlapping or conflicting permit requirements; and 3) Communicate the potential short- and long-term impacts of proposed significant coastal developments early in their life cycle and in terms understandable to the general public to facilitiate public pazticipation in the planning and review process. Check either "Yes" or "No" for each of the following questions. Yes No 1. X Will the proposed activity require more than two (2) permits or approvals? 2. X Does the proposed activity conform with the State and County land use designations for the site? 3. X Has or will the public be notified of the proposed activity? 4. X Has a draft or final environmental impact statement or an environmental assessment been prepared? Discussion 1. The proposed activity requires State and County approval through the CDUA and SMA process; coordination with the National Marine Fisheries Service under the Endangered Species Act; Water Quality Certification under Section 401 of the Clean Water Act; and coordination with the State Historic Preservation Officer under Section 106 of the National Historic Preservation Act. In addition, the normal construction permits will be issued by the County of Hawaii. 2. The project area is currently a road and sidewalk, and will remain so following construction. A-25 3. The Environmental Assessment (EA) which accompanies this Consistency Determination has been distributed to the public and vazious Federal, State and Hawaii County agencies. 4. An EA and Finding of No Significant Impact (FONSI) accompany this Consistency Determination. A-26 FIDERAL CONSISTENCY SUPPLEMENTAL INFORMATION FORM Project/Activity Title or Description: Island: Hawaii Tax Map Key No.: 4-2-13.16 Pors Est. Stazt Date:1993 APPLICANT OR AGENT Name & Title: Ralph H. Graves Lieutenant Colonel, U.S. Army District Engineer Agency/Organization: U.S. Army Engineer District, Honolulu Address: Building 230 Fort Shafter, Hawaii 96858-5440 TYPE OF APPLICATION [ X ] I. Federal Activity "The proposed activity is consistent with and will be conducted in a manner consistent to the maximum extent practicable with the Hawaii Coastal Zone Management Program." Signature: _ 'LZ ,v P H. GRA S Date Lieutenant Colonel, U.S. Army District Engineer A-27 APPENDIX B HISTORY HISTORY Alii Drive Shoreline Protection Project Kailua-Kona, Island of Hawaii, State of Hawaii June 1994 The history and prehistory of the ahu ua'a (traditional land division) of Lanihau and the Kailua-Kona area have been recorded in detail by Barrere (1975), Kelly (1983), and Schilt (1984) and will be presented only briefly here. Beginning in prehistory, Kailua-Kona has been an area of economic, ritual, and political importance. Vast traditional upland agricultural fields, extending for-many miles, suggest this area supported an extremely dense prehistoric population and attest to its economic importance to the early Hawaiians. The ritual importance of the area is illustrated by the numerous heiau (Hawaiian temple) which have been historically recorded, a great number of which are still extant. Called the "Playground of Royalty" since the early 19th century (Kanahele 1976: 8), Kailua-Kona has functioned, at least twice, as the administrative center for the kingdom. Traditionally, Kona is associated with a 15th century li'i (chief), 'Umi-a-Liloa, who politically unified the island of Hawaii. 'Umi is believed to have resided in the general area of the present Kailua-Kona village. Early 19th century maps depict a small promontory situated near the center of the bay which is labeled "Pa O 'Umi" (land of 'Umi). The geomorphic feature is no longer identifiable; it may lie beneath the present Alii Drive roadbed and seawall, or it may have been destroyed by modern alterations to the landscape. 'Umi is credited with establishing the traditional Hawaiian division of labor by appointing specialists in administration, crafts, economics, and religion. 'Umi's descendants were unable to maintain control over 'Umi's possessions and periods of inter- and infra-island warfare prevailed until 1795 when Kamehameha I, with the aid of western technology, conquered all of the major Hawaiian islands (except Kauai). After several years residence on Oahu, Kamehameha returned to the island of Hawaii and eventually established his seat of government and principal residence on the coastal portion of the ahupua'a of Lanihau in the northwestern portion of Kailua Bay. In 1820, the first group of Protestant missionaries arrived in Kailua-Kona and were eventually granted permission to establish a mission station. After several years of meeting in grass and wooden buildings, the basalt stone Mokuaikaua Church was erected in 1836. Shortly thereafter, in 1837, Governor Kuakini erected his residence (Hulihee Palace) immediately seaward of the church. In the early 1800's, Kailua Bay was a popular anchorage of foreign fur and sandalwood traders and whalers who purchased fresh food, water, and firewood at this port. In the mid-19th century, cattle raised in the uplands were herded into Kailua Bay and hoisted onto the decks of freighters. Once the area was established as a major seaport, docks were extended into the bay to facilitate loading goods onto barges. Currently, Kailua is a rapidly growing urban center economically based on the tourist industry. B-1 REFERENCES CITED Barrera, Dorothy 1975 Kamehameha in Kona: Two Documentary tudi Pacific Anthropological Records No. 23. Department of Anthropology, BP Museum, Honolulu., Kamakau, Samuel M. 1961 Ruling Chiefs of Hawaii. Honolulu: The Kamehameha Schools Press. Kanahele, Annie 1976 Annie. Life of a Hawaiian. Honolulu: Fisher Printing Co., Inc. Kelly, Marion 1983 Na mala o kona: Gardens of Kona. A History of Land Llce in Kona. Hawaii. Departmental Report 83-2. Department of Anthropology, BP Bishop Museum, Honolulu. Rubin, Meyer, Lea Kelley Gargulinski, and John P. McGeehin 1987 "Hawaiian Radiocarbon Dates." In Robert W. Decker, Thomas L. Wright, and Peter H. Stauffer (Eds.), Volcanism in Hawaii Volume 1. Washington, DC: US Government Printing Office Schilt, Rose 1984 Subsistence and Conflict in Kona. Hawaii: An Archaeoloqi al t ~dy of the Kuakini Highw~, alignment Cnrririnr Hawaii Historic Preservation Report 84-1. Department of Land and Natural Resources and Department of Transportation, State of Hawaii, Honolulu. B-2 APPENDIX C LETTERS OF COP~lENT AND RESPONSES ~0~.3 ~ t a a w ! L a p ~r~ L Y M '9 N C U ~ W al d O H ! C q M N .H ~ a 4 O 4 u .~i U a a y.H p C N y P a lI ~ u M w C L C ~ P'~ a q.Ty.ti ~ C C q Y ~ ~ ti > w v m o w ro u~ c 3 O O L b > O r .Ci A L N T T U N ~J y a Qud ~ O U q ~i+++ M yF N C W U 6 C m O =~a M O g a 0 P 4 a S U ro ~c= y U U C d U a c m 3 G T H q W O < r. a a q -.1 DUi w a y O> O u? ~ ~ a W ! w 0 4 a' w~w p ? 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