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HomeMy WebLinkAboutC2011-332 - 9/27/2011 - Approvedv CITY OF CORPUS CHRISTI PACKERY CHANNEL QUARTERLY MONITORING PROJECT Amendment No. 6 The City of Corpus Christi, Texas, hereinafter called "City ", and the Division of Nearshore Research (DNR) at Texas A &M University - Corpus Christi, hereinafter called "DNR ", hereby agree to amendment of the Contract as approved by Council February 26, 2008 (M2008 -052) and administratively amended on March 3, 2008 and by Motion 2008 -007 on January 13, 2008, by Motion 2009 -091 on April 14, 2009, by Motion 2010 -095 on April 27, 2010, and administratively September 21, 2010 follows: Section 11. Scope of Services, A. Tasks 2 -3 is amended to read as follows: II. SCOPE OF SERVICES A. TASKS: DNR will continue to conduct the comprehensive study of change in channel depth, shoaling, scour, shoreline position and beach volume at Packery Channel. The monitoring program will include the collection of bathymetric data in Packery Channel and the surrounding nearshore, measurement of elevation along the adjacent beach and bayside channel (shoreline position), and elevation measurements across the Mollie Beattie Coastal Habitat Community. The monitoring program will include measurement of current velocity in the channel that is presently sponsored by the USACE, Coastal Hydraulics Laboratory and Coastal Inlets Research Program. Specific tasks to be undertaken are set out as follows: Task 1. 1 -1. Project Management Description: Project Management, historic analysis, reporting, survey organization and scheduling as well as presentations and generation of materials requested by the City of Corpus Christi, Additional support includes coordination with surveyors, engineers, review committees and other environmental professionals to assist the City of Corpus Christi with related projects including potential dredge operations and /or FEMA reimbursement for storm damage. 1 -2. Aerial Photography Description: Acquisition of an annual set of rectified aerial photographs of the Packery Channel region including the entire channel from the GIWW to the Gulf of Mexico (GOM); including North Padre and Mustang Islands from the south end of the seawall to Newport Pass. Photographs are applied in ArcGIS environment for comparative analysis of change relative to key features and as a reference for overlay of data and terrain models. Purpose: For interpretation of large -scale changes in vegetation, dune line, and inter -tidal regions adjacent to the inland segment of the channel as well as along Padre and Mustang Islands, In addition, the aerials are appropriate for visuals and explanation aids for the community, residents and laypersons. Schedule: Annual (August/September 2011) pending weather conditions. Task 2. Measurement of Morphologic change in Packery Channel and along Mustang and Padre Island. 2 -1. Beach Profile surveys Description: The beach profile survey provides information on changes occurring at 18 specified locations from the Nueces Kleberg County Line to north of Fish Pass, There are historic data for these locations since 1995. Elevation measurements are collected along transects that initiate landward of the dune or other landward limiting feature (seawall) and extend offshore up to one mile into the Gulf of Mexico. Purpose: To document changes in features such as the beach berm crest, sand bars and dune crest. 2011 -332 ite volumetric change for sand placement/nourishment, to calculate sand ion and funding, and verify shoreline position data and determine the M2011 -212 (zone of influence) to identify trends or changes in the shape and width 09/27/11 ON RCo ntractAmd6-2011 -2012. doc Page 1 of 4 Div. of Nearshore Research - TAMUCC INDEXED of the beach. Schedule: (1) annual survey conducted during peak summer condition (September 2011). 2 -2. Shoreline Position surveys Description: Elevation data are collected by RTK GPS across the beach from close to the dune toe to the water line along a zigzag path. The beach is surveyed from south of the Nueces Kleberg County Line to north of Fish Pass. Purpose: These surveys are an efficient and low -cost way to measure changes in the width of the dry beach over the broad study area within days, a large section of the beach can be measured to determine changes in shoreline position from which regions of beach erosion and accretion can be determined and potential "hot spots" can be identified. Monitoring the seasonal position of the shoreline assists in management of beach vehicular access south of the inlet and addresses persistent regions of shoreline recession that have been identified fronting the North Padre Island Seawall and Whitecap Blvd as well as regions of receding shoreline north of the inlet near Newport Pass. Schedule: (2) Surveys/ Tentative survey schedule: September 2011, and January /February 2012. 2 -3. Surveys of channel and nearshore depth and morphology (bottom features) Description: These bathymetric surveys combine single -beam and multi -beam sonar coverage to provide high resolution of morphology (shoals, scour and bars). Seasonal series of data is applied to interpretation of pathways of sediment transport. Purpose: Data is applied to define features such as shoals (areas of deposition) and scour (areas of erosion) in the channel, nearshore and around structures. This data is applied to determine pathways of sediment transport and to calculate volumetric change for application to the estimation of the sand volume available for dredging. The data are applied to interpret trends in sediment transport as well as to calculate volumetric change, the calculation of sand loss or gain, for nourishment projects, and to identify potential regions of shoaling which could limit navigation. A primary application of this data is to assist with determining potential scheduling of dredging. Schedule: (3) Surveys. Tentative survey schedule: September 2011, January/February 2012 and June 2012. Additional surveys may be required if data indicate that depth - limited navigation is imminent. 2 -4. Inland Channel Segment and Mollie Beattie Coastal Habitat Community Description: The inland channel segment bordering MBCHC continues to modify as the region adjusts to changes in water flow in the channel and over the wetland. These changes are best captured seasonally through a network of cross - sections that document changes in wetland extent, channel boundaries and shoreline change. Elevation is measured along transects (survey lines) roughly perpendicular to channel orientation starting at the location of mean higher high water (MHHW) shoreline position along the south shore and then extending across the channel to the location of MHHW shoreline position or until a limiting feature (such as coverage of a raised placement area) is defined. Measure the MHHW shoreline position along the south shore of Packery Channel from the HWY 361 Bridge to the Relief Channel west of the channel dog leg. Purpose: These surveys define change in the inland segment of the channel that borders the MBCHC and changes in the elevation of the wetland. Analysis of these data sets provide quantification of change in primary ( -5 ft) and upper bank (MSL) width along MBCHC. In addition the MHHW position of the west side of the inland channel segment (residential and Packery Channel County Park) is surveyed and compared to previous data to determine historic change in position and stability. Schedule: (2) Survey Sets (Transects and MHHW). Tentative survey schedule: September 2011, January /February 2012. Additional surveys may be required if data indicate that the rate of change has increased during the study period. 2 -5. Event/Storm and Dredge /Environmental Support Surveys Description: In an effort to respond to reported City of Corpus Christi budgetary constraints, the monitoring program has been modified to include (2) seasonal surveys (Sept/Oct and Jan /Feb) and (1) transitional survey (June 2012). To accommodate monitoring concerns beyond these seasonal surveys this task provides for an event survey and environmental or dredge support surveys as needed, The J:1GENIPACKERY\ Monitoring 12011- 20121DNRContractAmd6- 2011- 2012.doc Page 2 of 4 primary purpose of the event survey is to facilitate timely pre- or post- storm surveys. Surveys could include but are not limited to post - storm, dredge support, engineering support, environmental assessment (wetland) and sand placement activities. Surveys may be needed beyond the seasonal designation, such as after storms, and to assist with the investigation of sensitive environmental habitat or anthropogenic influences on the coastal environment. Purpose: To provide information on changes in sediment transport, boundary definitions, volumetric analysis and dredge support beyond the limits of the seasonal surveys without time restrictions associated with the amendment process. Schedule: To be determined as necessary Deliverables: • ASCII data sets (x,y,z) NAVD88 State Plane south Zone FIPS 4205 • Email status report (monthly or as updates are available) • Status Reports (post - survey quarterly reports) Note: all surveys may be rescheduled based upon study findings or weather and sea conditions. Additional surveys may be recommended upon seasonal findings or evidence of change based upon observations in the field 2011 -2012 — Amendment 6 The proposal for Year 2011 -2012 is attached as Exhibit A -6. III, FEES AUTHORIZED The City will pay DNR a fixed fee not to exceed $2,173,218 for providing all services for during the contract term (12 months). The fee consists of an original contract fee of $241,487.00, a fee for Amendment No. 1 of $11,020.00 and a fee for Amendment No. 2 of $61,715.00 and a fee for Amendment No. 3 of $299,900.00 and a fee for Amendment No. 4 of $325,517.00, and a fee of $600.00 for Amendment No. 5 and a fee of $293,400 for Amendment No. 6. This fee will be full and total compensation for all services provided and expenses incurred in performing the tasks specified in Section 11, Invoices will be submitted to the Director of Engineering Services. Invoices will be submitted no more frequently than once per month for services rendered. All invoices shall be accompanied by a cover letter summarizing project status and the tasks undertaken during the time period covered by the invoice. Invoices will be based on the Task Fee set out by this contract amendment. Invoices will be sequentially numbered for each project, state the project name (Packery Channel Quarterly Monitoring Project) and City project number (5228). The letter shall state the number of the current invoice, the total authorized fee, the amount previously invoiced, and the current amount due. Statements will be based upon percent of project completed. However, a final payment of $3,500 will be retained until delivery of the final report. It is mutually acknowledged that fees authorized by the original contract or any prior amendment not invoiced may be used to defray the costs and expenses of Amendment No. 6 or for such additional tasks as may be directed by the City Manager or his designee. However, any task or additional service that requires additional funding beyond that authorized will be evidenced in writing as an amendment to this contract. Contract Fee Original Contract $241,487.00 Amendment No. 1 $11,020.00 Amendment No. 2 $61,715.00 Amendment No. 3 299,900.00 Amendment No. 4 325,517.00 Amendment No. 5 600.00 Amendment No. 6 $293,400.00 Total $1,233,639.00 J:IGRNTACKERY\ Monitoring 12011- 20121DNRContractAmd 6- 2011- 2012,doc Page 3 of 4 The fee for each Task for Amendment No. 6 is estimated to be: All other terms and conditions of the February 26, 2008 contract, as amended, between the City and Consultant shall remain in effect. CITY OF CORPUS CHRISTI By, A 41A `a i B .�ohn Perales, P.E, ate Assistant City Manager ATTIE 10 By '_ City Secretary Date Associate i A &M UNIVERSITY - CORPUS TI 1 J �� J re D. liams Date ;ipal I ves ' ator r. Luis Cifuentes Date 7/Research & Dean Of Graduate Studies APPROVED AS TO FORM: Assista ity Attor Date - - AUTHORIZED RECOMMENDED: Pete Anaya, P. E. Date Director — Engineering Services uracll_ ,.�..a j,' t SECRETARY J:IGENIPACKERY1Monitoring 1201 1- 201 21DNRContractAmd6- 2011- 2012.doc Page 4 of 4 Tasks Fee 1.1 Project Management 43,000 1.2 Aerial Photogra 12,100 2.1 Beach Profile Studies 35,200 2.2 Shoreline Position Studies 14,000 2.3 Surveys of channel and nearshore depth and morpholo 97,800 2.4 Inland Channel Segment and Mollie Beattie Coastal Habitat Communit 27,900 2.5 Event/Storm and Dredge /Environmental Support Surveys 63,400 $293,400 All other terms and conditions of the February 26, 2008 contract, as amended, between the City and Consultant shall remain in effect. CITY OF CORPUS CHRISTI By, A 41A `a i B .�ohn Perales, P.E, ate Assistant City Manager ATTIE 10 By '_ City Secretary Date Associate i A &M UNIVERSITY - CORPUS TI 1 J �� J re D. liams Date ;ipal I ves ' ator r. Luis Cifuentes Date 7/Research & Dean Of Graduate Studies APPROVED AS TO FORM: Assista ity Attor Date - - AUTHORIZED RECOMMENDED: Pete Anaya, P. E. Date Director — Engineering Services uracll_ ,.�..a j,' t SECRETARY J:IGENIPACKERY1Monitoring 1201 1- 201 21DNRContractAmd6- 2011- 2012.doc Page 4 of 4 1 : ul • • Packery Channel Monitoring Program Proposed Amendment for 2011/12 Project Task Definition and Cost Estimate June 16, 2011 Submitted to: The City of Corpus Christi Submitted by: Deidre D. Williams Division of Nearshore Research The Conrad Blucher Institute for Surveying and Science Texas A &M University- Corpus Christi Exhibit A -6 Pagel of 13 Page 1 of 13 . Figure 1. Packery Channel Morphology in February 2011. TAMUCC -CBI Packery Channel Quarterly Monitoring Proposal of Modified Project Tasks and Cost Estimate 2011/2012 Background The monitoring effort described in this proposal is a continuation of a comprehensive study of change in channel depth, shoaling, scour, shoreline position and beach volume at Packery Channel (Fig. 1). The analysis and interpretation of this data supports the City of Corpus Christi in the research -based management of Packery Channel as well as the adjacent wetland and Gulf beaches. This study began in 2003 under sponsorship of the U.S. Army Corps of Engineers, Galveston District and was continued under the sponsorship of the City of Corpus Christi during 2008 - 2011. The Division of Nearshore Research, at the Conrad Blucher Institute for Surveying and Science, Texas A &M University- Corpus Christi continues to conduct these investigations. The monitoring program includes; the collection of bathymetric data in Packery Channel and the surrounding nearshore, measurement of elevation along the adjacent beach and bayside channel (shoreline position), and elevation measurements across the Mollie Beattie Coastal Habitat Community (MBCHC). The monitoring program also includes measurement of current velocity in the inland channel segment that is presently sponsored by the USAGE, Coastal Hydraulics Laboratory, and the Coastal Inlets Research Program. Purpose Seasonal Monitoring Supports Research -Based Management Maintenance and Dredge Planning Prior to. 2010, seasonal trends in scour and shoaling were clearly defined in Packery Channel and the nearshore surrounding the channel mouth. Analysis of seasonal data sets shows a preference for shoaling (reduced depth) during the summer and scour, which restores deeper navigable depths, during the winter (Fig. 2). The channel has exhibited dynamic stability as it has undergone variation in location of shoals, position of deepest channel section, and scour. The identification of these trends, made possible by seasonal monitoring, directly supports dredge cycle management for the project. Original design projections suggested that dredging would be required, .on average, every 2 years. The information obtained through the seasonal monitoring program has confirmed channel navigability and potential for sustained navigability until June 2010, thereby allowing the conservation of City funds for future or alternate applications. No dredging has been required to maintain navigability since the channel was completed in 2006. Without seasonal surveys that capture the periodic flushing of the channel during the winter; dredge scheduling would have been based upon the annual summer survey which describes the channel at maximum sand capacity. The information provided by the seasonal surveys has supported management decisions to delay initiation of dredge operations. A change in system dynamic, which began after Hurricane Ike, manifested during the September 2010 survey. The summer survey showed that shoaling had reached a critical. Exhibit A -6 Pape 2 of 13 2 TAMUCC -CBI . point and that depth - limited navigation was imminent at the channel mouth (Fig. 3). Based on these observations it was recommended that the City of Corpus Christi initiate a public navigation warning. As a precaution the dredge permitting process was also initiated pending the results of the Winter (2011) and/or Transition (June) 2011 surveys. Thus, the seasonal surveys have provided the information necessary to proceed proactively to prepare for future dredge scheduling should the shoal at the mouth still challenge navigation at the peak of the summer 2011 season. The seasonal surveys continue to provide guidance for dredge planning at Packery Channel, based upon the most recent data describing the channel condition. In addition to dredge planning, Exhibit A -6 P e3of13 3 Figure 2. Seasonal trends in shoaling, scour, and longshore bar development prior to 2009. Figure 3. Expanding Entrance Channel shoal limits navigation during September 2011. TAMUCC -CBI seasonal surveys provide assistance with the identification of expanding shoals in locations that could temporarily limit navigation and benefit from the placement of aids to navigation. Initiation of this process was suggested after the February 2011 survey. This survey indicated that the shoal at the intersection of the Basin and Inner Entrance Channel was increasing and, if this trend continued, would effectively bisect the channel potentially presenting a navigation hazard. Change in System Dynamic and Monitoring Review of historic seasonal data reveals that the change in system dynamic was initiated by the surplus of available sand in the Inner Entrance Channel. The sand volume introduced into the channel during Hurricane Ike was on the order of that observed over a typical year. Subsequently, sand volume in the channel continued to increase annually as sand was blown into the channel from the adjacent beach by persistent and strong onshore wind. This surplus of sand in the channel resulted in 1) formation of a lobe, or tongue of sand that served to connect the mouth of the entrance channel to the nearshore in the Gulf of Mexico (Fig. 4), 2) expansion of the sand lobe such that it terminates in the form of a nearshore shoal, and 3) expansion of the basin shoal (Fig. 5) to the extent that the shoal potentially limits navigation during periods of low tide (effectively bisecting the channel into two segments at the intersection with the entrance channel). Prior to Hurricane Ike, wind and tidal current functioned to force a sufficient volume of sand out of the channel to maintain navigable depth from the basin to the channel mouth. The consistent flow of sand out of the channel also served to form the lobe or bridge of sand between the channel mouth and nearshore. Over time, this lobe of sand terminated in the form of a deep (8 -9 ft, MSL) shoal. The frequent, likely daily, flow of sand out of the channel mouth combined with sand transported toward the channel mouth by longshore current present the potential for ebb shoal development. The stage is set for potential development of an ebb shoal in the nearshore. At a minimum, the probability is high that a shallow navigation - limiting shoal similar to that observed during September 2010, will re- develop at the mouth of Packery Channel during the summer of 2011. The following key factors contributing to potential shoaling at the channel mouth include: 1) Surplus of sand exists in the system. A reserve of sand has accumulated in the channel from the basin shoal to the channel mouth. 2) Sand is consistently transported out of the channel by moderate to strong current flow during ebb tide. 3) Persistent flow of sand, crossing seasonal boundaries, moving out of the channel mouth has formed a lobe or bridge of sand between the Entrance Channel and nearshore. Scour no longer dominates across the channel mouth. 4) Development of the lobe of sand has begun to transcend seasonal boundaries (present during. summer and winter). 5) Southern longshore bar remained well developed during the winter of 2010/2011 (atypical) and intersects channel mouth (another "bridge" of sand ending at the channel mouth). 6) Position of the longshore sand bar is such that nearshore sand is transported directly toward the channel mouth during the summer months. Exhibit A -6 Pa e 4 of 13 M TAMUCC -CBI Feet 0 250500 1,400 - 1,500. 2,000 Figure 4. Development of a persistent lobe of sand that terminates in the form of a deep shoal in the nearshore (June 2010 to Feb 2011). Benefits and Future Success The key to successful management of an inlet system is knowledge of the processes that force sand into and out of the system and identification of change in feature development associated with sediment transport. Seasonal monitoring at Packery Channel provides tracking of changes which allow both 1) identification of trends in sediment transport, and 2) deviation from those trends that indicate a change in system dynamic. After Hurricane Ike., the channel entered a new dynamic phase, no longer strictly adhering to seasonal definitions. Benefit of Packery Channel Monitoring Program to the City of Corpus Christi Seasonal surveys provide information to support proactive channel management, particularly during a transitional period in channel evolution. These surveys provide the basis for the initiation of, 1) permitting and placement of navigation aids when depth - limited navigation in a segment of the channel is imminent, 2) rapid public alert when depth - limited navigation is imminent, 3) permitting and scheduling of dredge activities when the channel reaches a critical sand threshold and can no longer self - maintain (scour to navigable depth). In addition, the monitoring program tracks changes in channel width, morphology, and water depth along the inland channel segment adjacent to the MBCHC. These proactive measures are possible due to timely information provided through seasonal monitoring and analysis. Unscheduled gaps in the survey schedule result in gaps in understanding of the system and could result in a lapse in identification of the imminent development of navigation hazards. Ebb Shoal Development The implication of the recent changes in sediment deposition at the channel mouth is that the persistence of these new features indicates the potential for ebb shoal development. The source of sand feeding these features is the channel itself which is functioning to entrap additional wind -blown sand. In addition, the February 2011 survey showed that Exhibit A-6 Page 5 of 13 5 TAMUCC -CBI there was also an abundance of sand surrounding the channel mouth in the immediate nearshore, including a longshore bar on the south side of the inlet that terminates near the mouth of the channel. Previous surveys indicated that the bar will remain over the course of the summer. Uninhibited navigation will continue as long as the longshore current velocity remains sufficient to transport excess sand away from the mouth, but there could be periodic or persistent limitations to navigation. System Approach (Inlet, Beach, and Inland Channel Segment) The opening of Packery Channel to the Gulf of Mexico created a dynamic interactive system that includes the Corpus Christi Bay /Gulf Intracoastal Waterway, as well as adjacent beaches and. coastal wetland/protected habitat (MBCHC). To understand sediment transport in Packery Channel requires an understanding of the exchange of sand between contributing sand sources. Therefore, the monitoring program includes surveys of North Padre Island and Mustang Island beaches, as well as the MBCHC. North Padre Island and Mustang Island Beach The beach within the 1 -mile "Zone of Influence" of the jetties remains stable (Fig S). To date, the sheltering effect of the jetties is insignificant beyond this point, thus the beach remains at or near the pre - construction baseline position to the north and south of the Zone of Influence. The protected region initiates at the jetties and extends northward along Mustang Island to approximately 2,000 ft south of Newport Pass. South of the inlet this region extends from the south jetty to the Holiday Inn on the North Padre Island Seawall (Fig. 4). The shoreline at the south end of the seawall and fronting Whitecap Blvd. was located landward of the September 2010 position during February 2011. There are two particularly narrow sections of the beach beyond the protection of the jetties. These are located just south of Newport Pass and the section extending from the south end of the seawall to Padre Balli Park. Both regions may require nourishment to maintain vehicular access in the future. Two types of surveys are implemented to provide 1) sand volume and 2) shoreline position (estimate of beach width). The combination of these two surveys (beach profile and shoreline position surveys) identifies how much erosion or accretion has occurred on the beach relative to key features such as the North Padre Island Seawall and the jetties at Packery Channel. These topographic surveys provide a view of large scale change across the beach face from the dune to beyond the sand bars in the nearshore. From this data a conservative estimate of beach width, the most narrow the beach would be on a given day can be determined. This information is necessary to support decisions to Iimit vehicular access in regions where the beach is too narrow for safe driving. Regions of persistent shoreline recession (landward shift) are identified and "hot spots" of erosion and shoreline recession can be quantified. Beach profile survey data is applied to determine the volume of sand associated with the beach for FEMA reimbursement as well as beach nourishment during dredging. Exhibit A -6 a e6of13 6 TAMUCC -CBI Figure 5. Shoreline advance dominates within the inlet Zone of Influence. Inland Channel bordering Mollie Beattie Coastal Habitat Community The inland channel segment forms the western boundary of the Mollie Beattie Coastal Habitat Community ( MBCHC). The most significant change in channel boundary has occurred on the eastern bank that borders MBCHC. Seasonal surveys have identified the regions of greatest change. The greatest change is observed from just north of HWY 361 to the sharp curve toward the west (dog leg), north of Packery Channel County Park. Along this segment, the channel has expanded a minimum of 10 ft to in excess of 100. ft. Seasonal surveys have assisted in identifying the regions of greatest change, some of which are located near spillovers that direct water from the MBCHC during changing tides. The most significant change in channel bank width occurred from 2004 to 2008 as the inlet was opened to the Gulf of Mexico and construction was completed (Fig. 6). During this time, current velocity reached a peak and the channel struggled to reach an equilibrium with the new flow regime (prior to construction there had been little to no flow). Bank expansion at both the primary ( -5 ft, MSL) and upper bank (MSL) continues, although in most locations the rate of change has decreased since 2008. The rate of change in.bank expansion varies significantly, related in part, to the characteristics of the adjacent bank (i.e. placement island, spillover, revetment /dock). Research indicates that water current influences scour at the primary bank depth ( -5. ft, MSL) while continued change at the upper bank (MSL) is related not only to current but also boat wake. Surveys continue to track the natural modifications to the channel /wetland boundary as flow dynamics seasonally fluctuate. Exhibit A -6 Pa e7of13 J � S I TAMUCC -CBI s w a o Undeveloped Land W NW of HY 161' Mollie Beattie - MSL m u Residential SpIIIOVef Stable Wetland Mollie Beattie t V 1 L upper an - o - pper — ___________�— ________ s ti --- ----------- . ............................... .... ............_ .:........__ _ Prirnary_Benk_ --` ............ ........ - s .........`- -- -- -- -_ -... ...... .... .............................. .'__ —... P.dlLnar Bank..... O f tegana b - Le9end 0. -1 ug -A 2 091 O - tp , =AU9 2096 End C—... - 2006 End Ca,M.d6 Transee t2 — JUn zoos 2098 Franseot8 =&, — JUn 20y6 - JUn 209g -16 x - �•J 120M W �JUn 2008 -20 - �8ey x009 —den 2010 -� — 2008 �•Jnn 2019 g. — JUn zo19 —JUn 2m9 - yy --- SaP2010 — Feb2011 -16 —W2010 —Feb 2911 -G09 300 -200 .100 100 209 e69 400 609 S00 qpp .app :pp - -106 0 109 too am 400 ' 600 600 990 e60 eo9 mo 1100 1]00 Soo Disf9no. ft. Cellar Channel, R - Disbme from Center Channel, R Figure 6. Bank Expansion of inland Channel segment near HWY 361 (Transect 2) and bordering a spillover (Transect 8). Monitoring Program Tasks The proposed effort for 2011/2012 would function as an amendment to the existing contract for monitoring at Packery Channel. The five Tasks are outlined as a guide following the successful plans implemented from 2008 to 2011. Analysis shows that the channel has entered a period of dynamic change due to the large volume of sand available for transport in the basin, Inner Channel, Entrance Channel, and nearshore. Seasonal trends in sediment transport have been altered due to the abundance of sand in the system. Therefore, prediction of future dredge scheduling or potential for the development of navigation impairment is not as clearly defined as prior to Hurricane Ike and subsequent introduction of sand by persistent strong wind, These changes in the system. dynamic dictate the need for a proactive management approach on a season by season basis. Therefore, it is recommended that seasonal surveys are continued to provide timely notification of the potential for shoaling that will assist with dredge scheduling and navigation warnings. Survey Schedule Research conducted at Packery Channel shows that three seasonal surveys provide the most comprehensive information on sediment transport in the Inlet/Nearshore /Beach system. Based upon historic assessment, the most effective survey approach includes: I . Bathymetric surveys of the channel and nearshore. Purpose: Identify shoals and calculate sand volume for dredge purposes 2. Transect survey of MBCHC. Purpose: Identify. regions of shoreline /bank recession/channel expansion and change in boundaries of protected habitat. 3. Shoreline Position Survey (North Padre Island/Mustang Island). Purpose: Identify regions of shoreline recession and advance to determine hot spots of erosion (areas. needing nourishment) or possible areas of preferential accretion (borrow areas). In addition to these seasonal survey sets, one annual beach profile survey is conducted during the summer survey to determine change across the beach face from the dune line offshore to an approximate depth of -25 ft (MSL). This standard data set is applied to calculate volume change and cross sectional area of Exhibit A -6 Pa e8of13 8 TAMUCC -CBI the beach which is required for FEMA reimbursement and implementation of beach nourishment. The full survey set was developed to provide a comprehensive understanding of the shared system at Packery Channel. This information has assisted with the deferment of dredging as well as avoidance of potential damage to structures by postponing sand redistribution on North Padre Island prior to Hurricane Ike. As described in presentations to the City of Corpus Christi, sediment is shared between the adjacent beach, wetland and nearshore. The purpose of the surveys is to provide a seasonal snapshot of the changes in the system and compare those changes to historic data sets to provide guidance for research -based management of Packery Channel and the adjacent resources. In response to City requests for reduction in annual cost to conserve funds for future applications, the proposed amendment has limited the Transition (June 2012) survey to a bathymetric survey only (no beach, wetland or inland channel bank assessment). This survey provides the minimum coverage to address the primary concerns identified by the City of Corpus Christi for the summer high -use season. The following information will be provided from the bathymetric survey: a. Identification of shoals and regions of depth - limited navigation or potential for depth - limited navigation during the summer months (peak recreational usage). This information will be applied to identify regions for additional channel markers as indicators of potential shallow water and to assist in dredge scheduling. b. Identification of offshore shoaling that has the potential to limit navigation during the summer months or promote sand introduction into the channel mouth directly from the Gulf of Mexico. c. Tracking of recent bottom feature changes that are the result of available surplus sand in the channel system (to support channel management). d. Calculation of sand volume available for dredging. The June 2012 Transition survey does not include survey components that provide information on change in 1) the environmentally sensitive Mollie Beattie Coastal Habitat Community 2) the west shoreline along the inland channel segment (including residential area and Packery Channel County Park) and 3) the shoreline position, or beach width along Mustang Island and North Padre Island. Additional components can be added to the Transitional Survey utilizing discretionary funds from Task 2 -5 as needed. Tasks Definition and Estimated Cost Task 1. Project Management 1 -1. Project management includes historic analysis, reporting, survey organization and scheduling as well as presentations and generation of materials requested by the City of Corpus Christi. Additional support includes coordination with surveyors, engineers, review committees and other environmental professionals to assist the City of Corpus Exhibit A -6 P e9of13 9 TAMUCC -CBI Christi with related projects including potential dredge operations and/or. FEMA reimbursement for storm damage. Estimated Cost: $43,000 1 -2. Aerial Photography Description: Acquisition of an annual set of rectified aerial photographs of the Packery Channel region including the entire channel from the GIW W to the Gulf of Mexico (GOM); including North Padre and Mustang Islands from the south end of the seawall to Newport Pass. Photographs are applied in ArcGIS environment for comparative analysis of change relative to key features and as a reference for overlay of data and terrain models. Purpose: 1) Interpretation of large -scale changes in vegetation, dune line, and inter -tidal regions adjacent to the inland segment of the channel as well as along Padre and Mustang Islands. 2) Application as visual aids for the community, residents and laypersons. Schedule: (1) annual set conducted Aug /Sep 2011 (pending weather conditions). Estimated Cost: $12,100 Task 2. Measurement of Morphologic change in Packery Channel and along Mustang and Padre Island. 2 -1. Beach Profile survey Description: The beach profile survey provides information on changes occurring at 18 specified locations from the Nueces Kleberg County Line to north of Fish Pass. Historic data exists for these locations since 1995. Elevation measurements are collected along transects that initiate landward of the dune or other landward limiting feature (seawall) and extend offshore up to one mile into the Gulf of Mexico. Purpose: To document changes in features such as the beach berm crest, sand bars and dune crest. The data are applied to calculate: 1) Calculate volumetric change for sand placement/nourishment 2) Calculate sand volume for FEMA documentation and funding. 3) Verify shoreline position data and determine the maximum region of sheltering (Zone of Influence) by the jetties. Schedule: (1) annual survey conducted during peak summer condition (Sep 2011). Estimated Cost: $ 35,200 2 -2. Shoreline Position surveys Description: Elevation data are collected by RTK GPS across the beach from close to the dune toe to the water line along a zigzag path. The beach is surveyed from south of the Nueces Kleberg County Line to north of Fish Pass. Purpose: These surveys are an efficient and low -cost way to measure changes in the width of the dry beach over the broad study area. Within days, a large section of the beach can be measured to determine changes in shoreline position from which regions of beach erosion and accretion can be determined and potential "hot spots" can be identified. Monitoring the seasonal position of the shoreline assists in management of beach vehicular access south of the inlet and addresses persistent regions of shoreline Exhibit A -6 Pa e10of13 10 TAMUCC -CBI recession that have been identified fronting the North Padre Island Seawall and Whitecap Blvd as well as regions of receding shoreline north of the inlet near Newport Pass. Schedule: (2) Surveys. Tentative survey schedule: Sep 2011, Jan/Feb 2012. Estimated Cost: $14,000 2 -3. Surveys of channel and nearshore depth and morphology (bottom features) Description: These bathymetric surveys combine single -beam and multi -beam sonar coverage to provide high resolution of morphology (shoals, scour and bars). Seasonal series of data is applied to interpretation of pathways of sediment transport. Purpose: Data is applied to define features such as shoals (areas of deposition) and scour (areas of erosion) in the channel, nearshore and around structures. This data is applied to determine pathways of sediment transport and to calculate volumetric change for application to the estimation of the sand volume available for dredging. The data are applied to interpret trends in sediment transport as well as to calculate volumetric change, the calculation of sand loss or gain, for nourishment projects, and to identify potential regions of shoaling which could limit navigation. A primary application of this data is to assist with determining potential scheduling of dredging. Schedule: (3) Surveys. Tentative survey schedule: Sep 2011, Jan/Feb 2012 and June 2012. Additional surveys may be required if data indicate that depth - limited navigation is imminent. Estimated Cost: $ 97,800 2 -4. Inland Channel Segment and Mollie Beattie Coastal Habitat Community Description: The inland channel segment bordering MBCHC continues to modify as the region adjusts to changes in water flow in the channel and over the wetland. These changes are best captured seasonally through a network of cross - sections that document changes in wetland extent, channel boundaries and shoreline change. Elevation is measured along transects (survey lines) roughly perpendicular to channel orientation starting at the location of mean higher high water (MHHW) shoreline position along the south shore and then extending across the channel to the location of MHHW shoreline position or until a limiting feature (such- as coverage of a raised placement area) is defined. Measure the MHHW shoreline position along the south shore of Packery Channel from the HWY 361 Bridge to the Relief Channel west of the channel dog leg. Purpose: These surveys define change in the inland segment of the channel that borders the MBCHC and changes in the elevation of the wetland. Analysis of these data sets provide quantification of change in primary ( -S ft) and upper bank (MSL) width along MBCHC. In addition the MHHW position of the west side of the inland channel segment (residential and Packery Channel County Park) is surveyed and compared to previous data to determine historic change in position and stability. Schedule: (2) Survey Sets (Transects and MHHW). Tentative. survey schedule: Sep 2011, Jan/Feb 2012. Additional surveys may be required if data indicate that the rate of change has increased during the study period. Estimated Cost: $27,900 L �Pa xe hibit A -6 11 of 13 11 TAMUCC -CBI 2 -5. Event /Storm and Dredge/Environmental Support Surveys Description: In an effort to respond to reported City of Corpus Christi budgetary constraints, the monitoring program has been modified to include (2) seasonal surveys (Scpt/Oct and Jan/Feb) and (1) transitional survey (June 2012). To accommodate monitoring concerns beyond these seasonal surveys this task provides for an event survey and environmental or dredge support surveys as needed. The primary purpose of the event survey is to facilitate timely pre- or post- storm surveys. Surveys could include but are not limited to post - storm, dredge support, engineering support, environmental assessment (wetland) and sand placement activities. Surveys may be needed beyond the seasonal designation, such as after storms, and to assist with the investigation of sensitive environmental habitat or anthropogenic influences on the coastal environment. Purpose: To provide information on changes in sediment transport, boundary definitions, volumetric analysis and dredge support beyond the limits of the seasonal surveys without time restrictions associated with the amendment process. Schedule: Estimated Cost: up to $63,400 Total Estimated Cost to City of CC: $ 293,400 Deliverables: ASCII data sets (x,y,z) NAVD88 State Plane south Zone FIPS 4205 Email status report (monthly or as updates are available) Status Reports (presentations and briefings) Note: all surveys may be rescheduled based upon study findings or weather and sea conditions. Additional surveys may be recommended upon seasonal findings or evidence of change based upon observations in the field. Budget Next Page Exhibit A -6 Pa e 12 of 13 12 r TAMUCC -CBI Packery Channel Monitoring Program Estimated Budget July 2011 to July 2012 Personnel Principal Investigator $ 52,588 Database Management/support and technical staff $ 16,357 Subtotal Personnel $ 68,945 Benefits $ 18,732 Total Personnel $ 87,677 Fleet or Vehicle Rental Track/fuel $ 1,000 Total Transportation $ 1,000 Other Project Costs Materials and Computer (software upgrades $ 1,582 Repair Allowance, Backup /Archive) Surveying /post processing (Contractual) $ 159,000 Aerial Photography (Contractual) $ 7,000 Communication $ 600 Total Transportation and Other Project Costs $ 169,182 F/A (53 %) $ 36,541 Project Total $ 293,400 Exhibit A -6 Pa e13of13 13 SUPPLIER NUMBER TO BE ASSIGNED BY PURCHASING DIVISION w+rrrr City o f CITY OF CORPUS CHRISTI Corpus DISCLOSURE OF INTEREST Christi A .t City of Corpus Christi Ordinance 17112, as amended, requires all persons or firms seeking to do business with the City to provide the following information. Every question must be answered. If the question is not applicable, answer with `NA ". See reverse side for Filing Requirements, Certifications and definitions. COMPANY NAME: P. O. BOX: STREET ADDRESS: ZIP: FIRM IS: 1. Corporation e 2. Partnership e 3. Sole Owner ❑ 4. Association 5. Other DISCLOSURE QUESTIONS If additional space is necessary, please use the reverse side of this page or attach separate sheet. 1. State the names of each `employee" of the City of Corpus Christi havinf an "ownership interest" constituting 3% or more of the ownership in the above named "firm.' Name Job Title and City Department (if known) CITY: 2. State the names of each "official" of the City of Corpus Christi constituting 3% or more of the ownership in the above named " Name 3. State the names of each "board mem er interest" constituting 3% or more oith qd Name 1 4. State the names of who worked on r interest" consti tin Name ethe Ci of nersh ' the ffg an "ownership interest" 1 Titl20 _/k s Christi having an "ownership named "firm." Board, Commission or rch employee )r officer of a "consultant" for the City of Corpus Christi matter related to the sub, ect of this contract and has an ownership 3% or more of the ownership in the above named "firm." Consultant �a ;d FILING REQUIREMENTS If a person who requests official action on a matter knows that the requested action will confer an economic benefit on any City official or employee that is distinguishable from the effect that the action will have on members of the public in general or a substantial segment thereof, you shall disclose that fact in a signed writing to the City official, employee or body that has been requested to act in the matter, unless the interest of the City official or employee in the matter is apparent. The disclosure shall also be made in a signed writing filed with the City Secretary. [Ethics Ordinance Section 2 -349 (d)] CERTIFICATION I certify that all information provided is true and correct as of the date of this statement, that I have not knowingly withheld disclosure of any information requested; and that supplemental statements will be promptly submitted to the City of Corpus Christi, Texas as changes occur. Certifying Person: 0 Signature of Certify Person: Date: a. "Board member." A member of any board, commission, or committee appointed by the City Council of the City of Corpus Christi, Texas. b. "Economic benefit ". An action that is likely to affect an economic interest if it is likely to have an effect on that interest that is distinguishable from its effect on members of the public in general or a substantial segment thereof. "Employee." Any person employed by the City of Corpus Christi, Texas either on a full or part -time basis, but not as an independent contractor. d. "Firm." Any entity operated for economic gain, whether professional, industrial or commercial, and whether established to produce or deal with a product or service, including but not limited to, entities operated in the form of sole proprietorship, as self - employed person, partnership, corporation, joint stock company, joint venture, receivership or trust, and entities which for purposes of taxation are treated as non -profit organizations. "Official." The Mayor, members of the City Council, City Manager, Deputy City Manager, Assistant City Managers, Department and Division Heads, and Municipal Court Judges of the City of Corpus Christi, Texas. f. "Ownership Interest." Legal or equitable interest, whether actually or constructively held, in a firm, including when such interest is held through an agent, trust, estate, or holding entity. "Constructively held" refers to holdings or control established through voting trusts, proxies, or special terms of venture or partnership agreements." g. "Consultant." Any person or firm, such as engineers and architects, hired by the City of Corpus Christi for the purpose of professional consultation and recommendation. Dr. Luis Cifuentes Title: