The URL can be used to link to this page

Home My WebLink AboutMINUTES - 09122000 - C25 TO: BOARD OF SUPERVISORSs AS GOVERNING BOAR OF CONTRA COSTA COUNTY AND CONTRA COSTA COUNTY FLOOD CONTROL AND WATER CONSERVATION DISTRICT FROM: MAURICE M. SHIU, CHIEF ENGINEER. DATE: SEPTEMBER. 12, 2000 SUBJECT: APPROVE THE GREEN VALLEY CREED STORM DAMAGE REPAIR AT BUENO COURT PROJECT AND DETERMINE THE PROJECT IS A CEQA CLASS 1D CATEGORICAL EXEMPTION,DANVILLE AREA. PROJECT NO. 7520-689363-00 CDD-CP#00-45. Specific Request(s) or Recommendation(s) & Background & Justification I. RECOMMENDED ACTION: APPROVE the Green Valley Creek Storm Damage Repair at Bueno Court project and, DETERMINE that the project is a California Environmental Quality Act (CEQA) Class 1d Categorical Exemption, and DIRECT the Director of Community Development to file a Notice of Exemption With the County Clerk and, Continued on Attachment: X SIGNATURE: O4 .4I/i RECOMMENDATION OF COUNTY ADMINISTRATOR _RECOMMENDATION OF BOARD COMMITTEE APPROVE —OTHER SIGNATURE(S): ACTION OF BOARD ON SEFFEMBER 12, 2000 APPROVED AS RECOMMENDED OTHER— I hereby certify that this is a true and correct copy of an action VOJE OF SUPERVISORS taken and entered on the minutes of the Board of Supervisors UNANIMOUS(ABSENT III. ) on the date shown. AYES: NOES: ABSENT: ABSTAIN: LC:drf ATTESTED:_, SFPMffiFR 12, 9000 G:EngSvc\ENVIRO\2000Projects\Maintprojs\GreenValleyCr@BuenoCt PHIL BATCHELOR, Clerk of the 18oard of Supervisors and \BoardOrder County Administrator Orig.Div: Public Works(Engineering Services Division) Contact: T.Jensen,Maintenance(313-7008) cc: Administrator-Attn: E.Kuevor ByCL-rv.-� Deputy Auditor-Controller Community Development®D.Foley Public Works: Accounting Construction L.Chavez,Engineering Services SUBJECT: APPROVE THE GREEN VALLEY CREEK STORM DAMAGE REPAIR AT BUENO COURT PROJECT AND DETERMINE THE PROJECT IS A CEQA CLASS 1D CATEGORICAL EXEMPTION, DANVILLE AREA. PROJECT NO. 7520-6119363-00 CDD-CP##00-45. DATE: September 12, 2000 PAGE: 2 RECOMMENDED ACTION(continued): AUTHORIZE the Chief Engineer to arrange for payment of a $25 fee to Community Development for processing, and a$25 fee to the County Clerk for filing the Notice of Exemption. II. FINANCIAL IMPACT: The estimated project cost is $45,000, funded by 100%Zone 3b III. REASONS FOR RECOMMENDATION/BACKGROUND: The project includes the repair of an eroded streambank area with vegetated riprap. It is needed in order to stabilize the streambank. The project is exempt from CEQA because it consists of repairing an existing flood control facility. The project was found to be in conformance with the General Plan of the Town of Danville. The repair will not result in any expansion of use beyond that previously existing. The project will not result in the removal of any scenic resource. IV. CONSEQUENCES OF NEGATIVE ACTION: Delay in approving the project will result in a delay of design and construction and may jeopardize funding. CONTRA PUBLIC WORKS DEPARTMENT COSTA INITIAL STUDY COUNTY OF ENVIRONMENTAL SIGNIFICANCE PROJECT # 7520-6139363-00 CP# 00-45 PROJECT NAME: Green Valley Creek Storm Damage Repair at Bueno Court PREPARED BY: Leigh ChavezO DATE: 6129/00 APPROVED BY: J;nDATE: -7 RECOMMENDATIONS: (X) Categorical Exemption (Class 1d) ( ) Negative Declaration ( ) Environmental Impact Report Required ( ) Conditional Negative Declaration The project will not have a significant effect on the environment. The recommendation Is based on the following: The proposed project consists of repairing an existing flood control facility. The repair will not result in any expansion of use beyond that previously existing. The project will not result in the removal of any scenic resource. What changes to the project would mitigate the identified Impacts N/A USGS Quad Sheet Diablo Base Map Sheet # S16 Parcel # N/A GENERAL CONSIDERATIONS: 1. Location: The project site is located on the south bank of Green Valley Creek near Bueno Court in the Danville area. (Figures 1-3) 2. Project Description: The project consists of repairing an area of bank erosion by excavating and removing unstable soil and replacing it with vegetated riprap (Figure 4). The area to be stabilized is approximately 50' x 30' x 3'. A pool ranging in depth from two to twelve feet is located at the toe of the failing bank. Green Valley Creek is perennial and flows will need to be diverted around the project site. A water diversion system reviewed by the County and approved by the California Department of Fish and Game will be implemented to dewater the construction site. A sediment filter dam will be installed downstream of the project site to minimize sedimentation within the creek as a result of the project. The repair activity will be kept to the minimum necessary to accomplish the repair, and the work site will be kept clear of construction debris. The contractor will determine site access. Any alterations to channel grade will be returned to pre-construction conditions at the completion of the project. One cottonwood (Populus sp.) and one alder(Alnus sp.) may require removal as a result of the project. If removal is required, the trees will be replaced at up to a 3:1 ratio in the vicinity of the project site (depending on the outcome of negotiations with Fish and Game representatives). In addition, approximately four cottonwood stumps at the slide area will require removal. Three of the stumps are dead, however, one of the stumps is sprouting. These sprouts, along with plant material from the cottonwood to be removed, will be used as cuttings for the vegetated riprap. The vegetated riprap will be covered with soil and seeded above the ordinary high water mark. As a component of the project, the three non-native invasive pampas grasses adjacent to the project site will be removed. Best Management Practices (BMPs) will be utilized throughout the course of the project. BMPs will include installation of Environmentally Sensitive Area (ESA)fencing as the first order of work to clearly define the project limits and area of impact, as well as dewatering of the work site and installation of sediment filter barriers prior to initiation of construction. All stockpiles will be located outside of the streamzone. In addition, fueling and maintenance of equipment will occur at designated staging areas. The work site will be maintained in a clean condition on a daily basis. All bare slopes and vegetated riprap above the ordinary high water mark will be seeded with a native seed mix at the completion of the project. Red-legged frogs have been identified within the Green Valley Creek watershed. Based on the habitat conditions at the project site, including the presence of riparian cover both up and downstream of the project site, the essentially natural condition of the creek, and the presence of a deep pool at the project site, Public Works staff have contacted USFWS for input on the project. However, the project area is highly urbanized and previous correspondence with USFWS representatives for the general project area has indicated that red-legged frog are unlikely to use this stretch of Green Valley Creek. A preconstruction survey conducted last summer on Green Valley Creek for a construction project approximately 0.5 mile upstream of the Bueno Court project site had negative results for red-legged frog. In order to avoid potential impacts to red-legged frog, the County will conduct a preconstruction survey for red-legged frog within one week of the start date. In addition, construction will occur during the dry season (July through September) and the project site will be dewatered. The habitat conditions that are potentially suitable for red-legged frog at the project site also suggest the possible presence of Western pond turtle (Clemmys marmorata marmorata) in the area. A pre- construction survey for the presence of this species will be conducted within one week of the project start date. BMPs incorporated into the project description such as dewatering of the construction site, working during the dry season (July-September), and relocating any turtles found to an appropriate downstream location, will minimize any impacts to this species as a result of construction activities. Based on the low-flow condition of the creek during late summer months, the presence of a silt-clay substrate which is poor spawning and rearing habitat, and the presence of drop-structures and culverted sections downstream of the project site, Coho salmon (Oncorhynchus kisutch), Chinook salmon (Oncorhynchus tshawytscha), and California steelhead (Oncorhynchus mykiss irideus) are not expected to utilize this section of the creek. 3. Does it appear that any feature of the project will generate significant public concern? [ ] yes [X] no [ ] maybe (Nature of concern): 4. Will the project require approval or permits by other than a County agency? [X] yes o no Agency Name(s) California Department of Fish and Game, California Regional Water Quality Board and the U.S. Army Corps of Engineers 5. Is the project within the Sphere of Influence of any city? Yes, City of Danville G:\GrpData\EngSvc\ENVIRO\2000Projects\MaintProjects\GrnValleyCr a@BuenoCourt\CatEx �r 0? . Y _ 1 CJ � � d IVA uj U ice► C> a � cl +F a a��=r.�w��.�. .,�i.�--�.t�. rr'i}��. ��S�CLF:�•'v"C��.a:��'w771�`u3, '-�n�,..�.':..«�..w..�<�,e_x.Ar2�lf.{�1 Ivi .a sitii� c" � 9..�a � '�.e� "^ goo, WbL*,rngV 4 Al' Op Nil Al w r �," . : t •'� it :�' , �i, �._� �/ c��-� ��.� � f~ �� `�� F: 3t • 4 low ,C, to as-it WIN. y 9- � r '•�t t E - 1m! ' �`y '�,[�"yS",�`�,�.',c�i�; ,^',�re•� �'�t�p wr: It A!F � �� +-,,rgcyu,j •%;►� 44r��' fii,iiia �►. log Rd m IMMA ME r��. .�'►�,,II�.'.'M'�,1�;;� MAN AM, �him loll ' RJR dM AM INW INS SUMAM OVA � dm UM � WIN W. OR d POW OF A 41 IN t�3 .its►+ .ra+w �+octu�r+ oor *RC. �R14t a � +� '`. .+�• " "� tri '"'{ � ° �+`i�r•ter .'° y � � 4 � � Y 1 CrQ MUOW PL+tN17NC (VADOSE) ZONE' cy CALIFORNIA, ENVIRONMENTAL QUALITY ACT Notice of Exemption' Contra Costa County Community Development Department 651 Pine Street,4th Floor-North Wing,McBrien Administration Building Martinez, CA 94553-0095 Telephone: (510)313-2296 Contact Person:CeceSellgren-Public Works Deot. Project Description, Common Name(if any)and Location:Green Valley Croak Storm Damage Repair at Buono Court,County File#:CP 00-45 Project Description:The project consists of repairing an area of bank erosion by excavating and removing unstable soil and replacing it with vegetated riprap(Figure 4). The area to be stabilized is approximately 50'x 30'x 3'. A pool ranging in depth from two to twelve feet is located at the toe of the failing bank. Green Valley Creek is perennial and flows will need to be diverted around the project site. A water diversion system reviewed by the County and approved by the Callfomia Department of Fish and Game will be implemented to dewater the construction site.A sediment filter dam will be installed downstream of the project site to minimize sedimentation within the creek as a result of the project. The repair activity will be kept to the minimum necessary to accomplish the repair, and the work site will be kept clear of construction debris.The contractor will determine site access. Any alterations to channel grade will be returned to pre-construction conditions at the completion of the project. One cottonwood (Populus sp.)and one alder(Alnus sp.)may require removal as a result of the project. If removal is required, the trees will be replaced at up to a 3:1 ratio in the vicinity of the project site (depending on the outcome of negotiations with Fish and Game representatives). In addition, approximately four cottonwood stumps at the slide area will require removal. Three of the stumps are dead; however, one of the stumps Is sprouting.These sprouts, along with plant material from the cottonwood to be removed, will be used as cuttings for the vegetated riprap. The vegetated riprap will be covered with soil and seeded above the ordinary high water mark. As a component of the project,the three non-native invasive pampas grasses adjacent to the project site will be removed. Best Management Practices (BMPs) will be utilized throughout the course of the project. BMPs will include installation of Environmentally Sensitive Area(ESA)fencing as the first order of work to clearly define the project limits and area of impact, as well as dewatering of the work site and installation of sediment filter barriers prior to initiation of construction. All stockpiles will be located outside of the streamzone. In addition,fueling and maintenance of equipment will occur at designated staging areas. The work site will be maintained In a clean condition on a daily basis. All bare slopes and vegetated riprap above the ordinary high water mark will be seeded with a native seed mix at the completion of the project. Red-legged frogs have been identified within the Green Valley Creek watershed. Based on the habitat conditions at the project site, Including the presence of riparian cover both up and downstream of the project site,the essentially natural condition of the creek, and the presence of a deep pool at the project site, Public Works staff have contacted USFWS for input on the project. However,the project area is highly urbanized and previous correspondence with USFWS representatives for the general project area has indicated that red- legged frog are unlikely to use this stretch of Green Valley Creek. A preconstruction survey conducted last summer on Green Valley Creek for a construction project approximately 0.5 mile upstream of the Bueno Court project site had negative results for red-legged frog. In order to avoid potential Impacts to red-legged frog,the County will conduct a preconstruction survey for red- legged frog within one week of the start date. In addition,construction will occur during the dry season (July through September) and the project site will be dewatered. The habitat conditions that are potentially suitable for red-legged frog at the project site also suggest the possible presence of Western pond turtle (Clemmys marmorate marmorafa) in the area. A pre-construction survey for the presence of this species will be conducted within one week of the project start date. BMPs incorporated into the project description such as dewatering of the construction site,working during the dry season (July-September), and relocating any turtles found to an appropriate downstream location, will minimize any impacts to this species as a result of construction activities. Based on the low-flow condition of the creek during late summer months, the presence of a slit-clay substrate which is poor spawning and rearing habitat,and the presence of drop-structures and culverted sections downstream of the project site, Coho salmon (Oncorhynchus kisutch), Chinook salmon (Oncorhynchus tshawytscha), and California steelhead (Oncorhynchus mykiss frldeus)are not expected to utilize this section of the creek. Project Location: The project is located on the south bank of Green Valley Creek near Bueno Court in the Danville area. This project is exempt from CEQA as a: _ Ministerial Project(Sec. 15268) _ Other Statutory Exemption, Section _,_ Declared Emergency(Sec. 15269(a)) General Rule of Applicability(Section 15061(b)(3) _ Emergency Project(Sec. 15269(b)or(c)) __,X_ Categorical Exemption, Class l