An Employee-Owned Company

An Employee-Owned Company August 27, 2018 Mr. Luis Valdez Engineering Manager Sweetwater Authority 505 Garrett Avenue Chula Vista, CA 91910 Reference: Results of the Cultural Resources Survey for the 36-inch Transmission Water Main Replacement (RECON Number 7729) Dear Mr. Valdez: The 36-inch Transmission Main Replacement Project (proposed project) entails the installation of approximately 16,500 linear feet of water transmission main (main) operated by the Sweetwater Authority (Authority), and the abandonment of the existing main. This letter describes the background, methods, and results of RECON Environmental, Inc. s (RECON) cultural resources survey conducted for the proposed project. RECON completed a field and archival investigation to gather information on the cultural resources within or adjacent to the project alignment. The fieldwork consisted of an on-foot survey of the project alignment. The archival research was a record search of the database maintained by the South Coastal Information Center (SCIC) and a search of the files at the Native American Heritage Commission (NAHC) in Sacramento. One cultural resource was identified adjacent to one of the staging areas. RECON recommends archaeological and Native American monitoring during trenching for three segments of the pipeline. Project Description The Authority, as the lead agency pursuant to the California Environmental Quality Act (CEQA), is proposing the installation of approximately 16,500 linear feet of main and the abandonment of the existing main. The majority of the main would be installed within proximity to the existing alignment, while some portions would be realigned. The project alignment is located in the Sweetwater River valley, from just west of Interstate 805 (I-805) to State Route 125 (SR-125), within portions of the city of Chula Vista and unincorporated San Diego County, within the communities of Bonita and Sunnyside (Figure 1). The project is in the La Nación land grant on the U.S. Geological Survey (USGS) National City quadrangle (USGS 1996; Figure 2). The project alignment is composed of five segments, primarily along Bonita Road, but also within a segment of Willow Road and portions of the Chula Vista Golf Course and the Bonita Golf Club (Figure 3). In each segment, installation of the new main would occur first, followed by the abandonment of the existing main. Construction would be accomplished primarily through open trenching, while jack and bore method would be utilized for a storm drain crossing along a limited portion of Bonita Road for Segment 1. Open cut trenching involves excavating a linear trench and installing the new main and associated appurtenances (such as air release valves and manholes). Construction would proceed at approximately 80 feet per day for the 36-inch and 48-inch main. Project activities may not necessarily proceed in order (i.e., from Segment 1 east to Segments 2 and 3); however, they are organized in this manner for purposes of this document. 1927 Fifth Avenue, San Diego, CA 92101 619.308.9333 reconenvironmental.com SAN DIEGO CENTRAL COAST BERKELEY TUCSON

Batiquitos Lagoon San Marcos Carlsbad Encinitas Solana Beach E s c o n d i d o Rancho Santa Fe C r e e k R i D a n S Fairbanks Ranch i v uu g e r e Lake Hodges ii tt o Escondido Poway S A N D I E G O C O U N T Y Ramona UV 78 San Diego Country Estates Del Mar UV 56 Los Penasquitos Canyon Presv San Vicente Reservoir 5 Coronado SAN BERNARDINO USMC AIR STATION MIRAMAR Mission Trails UV 163 Regional Park UV 282 UV 75 San Diego 15 805 National City O t a S w e t w e a a UV 54 t USMC AIR STATION MIRAMAR e UV 94 v e r R i r UV 125 Casa de Oro-Mount Helix La Presa Spring Valley S Sweetwater Reservoir e t w v e r e w UV 67 Lakeside Winter Gardens R i a tt e r S a UV 8 52 La Mesa Lemon Grove Chula Vista Santee n R Lower Otay Reservoir Barona Reservation Capitan Grande Reservation i D u D i l g e v e r z u o Bostonia Harbison Canyon El Cajon a C r a Cleveland NF El Capitan Reservoir Granite Hills Crest Loveland Sycuan Reservoir Reservation Rancho San Diego Jamul Jamul Indian Village e r e k ORANGE RIVERSIDE Imperial Beach y v R i e r UV 905 SAN DIEGO M E X I C O MEXICO 0 Miles 5[ Project Alignment M:\JOBS4\7729\common_gis\2018_Biotec\fig1.mxd 4/11/2018 fmm FIGURE 1 Regional Location

Map Source: USGS 7.5 minute topographic map series, National City quadrangle, 1975, La Nacion land grant Segment 4 Segment 3 Segment 5 Segment 2 Segment 1 0 Existing Pipeline Project Alignment 32-inch Transmission Main (to be abandoned) 36-inch Transmission Main 36-inch Transmission Main (to be abandoned) 48-inch Transmission Main Potential Staging Area Feet 2,000 [ FIGURE 2 Project Location on USGS Map M:\JOBS4\7729\common_gis\2018_Arc\fig2.mxd 5/10/2018 fmm

Image source: Nearmap (flown February 2018) V U 54 ISE VA LL EY P LA ZA PA R A D W VE O LI OO TW AN ER SAN DIEGO COUNTY DM REO AT V U 125 SW EE CITY OF SAN DIEGO PO T O M AC NATIONAL CITY S AN MI G UEL Segment 4 CEN T RA L CO V U 54 ND A A TO N AW LC AN YO N Segment 3 R VA LL E Y SAN DIEGO COUNTY RR A EO 805 Segment 5 NATIONAL CITY W S W EE TWAT IL ER LO W Segment 2 CITY OF CHULA VISTA SAN DIEGO COUNTY OTAY LAKE S Segment 1 CITY OF CHULA VISTA PL E ST AZA BONITA RD BO NI T AR D 0 Municipal Boundaries Existing Pipeline Potential Staging Area Proposed Pipeline 32-inch Transmission Main (to be abandoned) 36-inch Transmission Main 36-inch Transmission Main (to be abandoned) 48-inch Transmission Main Feet 1,500 [ FIGURE 3 Project Alignment on Aerial Photograph M:\JOBS4\7729\common_gis\2018_Arc\fig3.mxd 5/10/2018 fmm

Mr. Luis Valdez Page 5 August 27, 2018 Following installation of the new main, the existing main would be abandoned. The existing main would be pumped full of concrete slurry or similar material. This would prevent collapse of the abandoned pipe. The abandonment operations would not occur until the replacement water main has been constructed, tested, and connected for use. The slurry material would be mixed in an automated batch plant and delivered to the site in ready-mix trucks. The slurry material would be continuously pumped in at entry points (i.e., approximately 5 feet by 5 feet), approximately 600 to 700 feet apart along the abandoned alignment. Where these entry points are located, the ground would be restored to its previous condition. Conceptual construction staging areas were included in the analysis for this document but have not been selected or secured for use at this time. The staging areas in Segments 1 and 4 were surveyed as part of the cultural resources survey. Staging areas would be finalized following selection of a construction contractor. If staging areas are identified that are not included in this analysis, they would be required to be located in previously disturbed or developed areas, or otherwise require further analysis regarding impacts to cultural resources. Segments 1 and 2 would occur entirely within Bonita Road from generally the I-805 east to Glenn Abbey Drive. Segment 3 starts in Bonita Road just west of Allen School Road, extends north into the Chula Vista Golf Course parking lot, and continues northeast into the golf course across the tee box for the first hole. From here, it continues northeast across the driving range and Sweetwater River towards the tenth hole. Segment 4 begins at the Sunnyside Bridge where Bonita Road meets San Miguel Road. The existing 36-inch transmission main extends from the bridge northeast through the middle of the golf course. This portion of the transmission main would be abandoned in place. The new transmission main would be realigned to the southern and eastern perimeter of the golf course, along previously disturbed trails and Conduit Road, which would allow for better maintenance access and would avoid impacting wetlands associated with the Sweetwater River. At the northern portion of this segment, the alignment would extend under SR-125. Segment 5 is located adjacent to Segments 2 and 3 on the southwest side of Willow Street near Bonita Road. Segment 5 is the transmission main interconnection between the 42-inch main and 36-inch main at Willow Street. An existing section of 32-inch transmission main currently extends south-southwest from the northern extent of the Kaiser Permanente parking lot, adjacent to the medical office buildings. This section of main will be abandoned. The new main would be installed along the northeastern perimeter of the parking lot and within a small reach of Willow Street within previously developed areas. The new main alignment has been designed to avoid sensitive areas while also avoiding conflicts with the City of Chula Vista s proposed storm drain improvements within Willow Street. Natural Setting The project alignment is located within the Sweetwater River Valley. The Sweetwater River runs more or less parallel to the project alignment. During prehistoric times, access to the water was a determining factor in identifying where people lived and collected resources. The area has been developed by two golf courses and trails within the County of San Diego s Sweetwater Regional Park. To the north and south of the project alignment, there are residential and commercial developments. Elevation ranges from 40 feet above mean sea level (AMSL) on the west end to 120 feet AMSL on the east end near SR-125. Cultural Setting The prehistoric cultural sequence in San Diego County is generally described as comprising three basic periods: the Paleoindian, dated between about 11,500 and 8,500 years ago and manifested by the artifacts of the San Dieguito Complex; the Archaic, lasting from about 8,500 to 1,500 years ago (A.D. 500) and manifested by the cobble and core technology of the La Jollan Complex; and the Late Prehistoric, lasting from about 1,500 years ago to historic contact (i.e., A.D. 500 to 1769) and represented by the Cuyamaca Complex. This latest complex is marked by the appearance of ceramics, small arrow points, and cremation burial practices.

Mr. Luis Valdez Page 6 August 27, 2018 Regulatory Setting A cultural resource is an object or definite location of human activity, occupation, use, or significance identifiable through field inventory, historical documentation, or oral evidence. Cultural resources are prehistoric, historic, archaeological, or architectural sites, structures, buildings, places, or objects and locations of traditional cultural or religious importance to specified social and/or culture groups. The regulatory framework and methods for determining impacts on cultural resources associated with the proposed project include compliance with the requirements of the California Environmental Quality Act (CEQA), as defined in Section 15064.5 of the CEQA Guidelines. These guidelines require the identification of cultural resources that could be affected by the proposed project, the evaluation of the significance of such resources, an assessment of the proposed project impacts on significant resources, and a development of a research design and data recovery program to avoid or address adverse effects to significant resources. Significant resources, also called Historical Resources as defined in California Code of Regulations (CCR) Section 15064.5 and Public Resources Code (PRC) 5024.1, are those cultural resources (whether prehistoric or historic) that are potentially eligible for listing in the California Register of Historical Resources (CRHR). Under CEQA, a project may have a significant impact on the environment if the project causes a substantial adverse change in the significance of a Historic Resource. According to CEQA, a resource is historically significant if it meets one of the criteria for listing on the CRHR (PRC 5024.1, Title 14 CCR, Section 4852). That is, a property is significant if it: 1. Is associated with events that have made a significant contribution to the broad patterns of California s history and cultural heritage. 2. Is associated with the lives of persons important to our past. 3. Embodies the distinctive characteristics of a type, period, region, or method of construction, or represents the work of an important creative individual, or possesses high artistic values. 4. Has yielded, or may be likely to yield, information important in prehistory or history. In addition to meeting one of the above criteria, a resource must retain enough of its integrity, or the authenticity of a historical resource s physical characteristics that existed during the resource s period of significance [CCR Title 14, Chapter 11.5 Section 4852 (c)]. CEQA also recognizes resources listed in a local historic register or deemed significant in a historical resource survey. Some resources that do not meet these criteria may still be historically significant for the purposes of CEQA. According to CEQA, a significant impact is a project effect that may cause a substantial adverse change in the significance of a historical resource. Adverse changes include physical demolition, destruction, relocation, or alteration of the resource or its immediate surroundings resulting in the impairment of the resource s significance (Section 15064.5.4b, CEQA Guidelines). Mitigation measures are required for adverse effects on significant historical resources (PRC Section 21083.2). Methods The cultural resources survey included both an archival search and an on-site foot survey of the alignment where there was no existing development. This means that paved segments were not surveyed on-foot. Portions of Segment 3, Segment 4, Segment 5, and the conceptual staging areas near Segments 1 and 4 were surveyed. The entire length of the alignment with a 50-foot buffer from the centerline is considered the Area of Potential Effect (APE). A records search with a half-mile radius buffer was completed at the SCIC at San Diego State University in order to determine if previously recorded prehistoric or historic cultural resources occur with the APE. Historic aerial photographs were also checked in order to see past development within and near the APE.

Mr. Luis Valdez Page 7 August 27, 2018 A letter was sent on May 8, 2015 to the NAHC requesting they search their files to identify spiritually significant and/or sacred sites or traditional use areas in the proposed project vicinity. The NAHC was also asked to provide a list of local Native American tribes, bands, or individuals who may have concerns or interests in the cultural resources of the proposed project (Attachment 1). The field survey for Segments 1 through 4 was conducted on May 14, 2015 by RECON archaeologists Carmen Zepeda-Herman and Nathanial Yerka accompanied by Tushon Phoenix, a Native American monitor from Red Tail Monitoring and Research. The spacing between field personnel was 3 to 5 meters. The survey area was inspected for evidence of archaeological materials such as flaked and ground stone tools, ceramics, milling features, and historic features. Photographs were taken to document the environmental setting and general conditions. An additional field survey was conducted for Segment 5 on September 8, 2015 by RECON archaeologist Nathanial Yerka. A 5-meter buffer area from centerline of alignment was surveyed which included wetlands associated with the Sweetwater River. Archival Results The record search indicated that there have been 73 archaeological investigations and 23 cultural resources within a half-mile radius of the APE (Attachment 2). There were 59 historic addresses listed within the search area. Thirteen prehistoric sites, seven historic sites, two prehistoric isolated artifacts, and two multicomponent sites with both prehistoric and historic components have been recorded within the search area. Four cultural resources are within or immediately adjacent to the proposed project area. CA-SDI-11452 was recorded as a lithic and ground stone artifact scatter consisting of manos, flakes, flake tools, and cores in 1989 (Rosen et al. 1989a). This site is mapped immediately adjacent to the APE. Construction of SR-125 has impacted this site and most likely destroyed it. CA-SDI-11453 was recorded as a lithic and ground stone artifact scatter consisting of flakes, cores, hammerstones, flake tools, and one mano (Rosen et al. 1989b). This site is mapped adjacent to one of the proposed staging areas. P-37-017399 consists of the footings for the National City and Otay Railroad trestle over the Sweetwater Valley after the 1916 flood washed away the bridge and tracks. The footings are constructed of granite porphyry extracted from the Sweetwater Quarry (Carrico 1990). This site is mapped within the APE. Isolate P-37-015168 was recorded as a flake within Segment 4 (Shultz et al 1992). The 1953 historic aerial photograph shows the survey area as being undeveloped, with agricultural fields and some associated buildings; the Bonita Road and Sweetwater Road crossings over the river were already built. Construction of the Chula Vista Golf Course was noted in the 1968 aerial photograph while construction of the Bonita Golf Club was noted in the 1981 aerial photograph (Nationwide Environmental Title Research 2015). The NAHC reply letter was received May 29, 2015 indicating the NAHC files failed to indicate the presence of Native American cultural resources in the immediate project area (Attachment 3). The NAHC recommends that early consultation with Native American tribes is the best way to avoid unanticipated discoveries. Contact letters to the listed individuals and groups were sent out on June 3, 2015 (Attachment 4). Survey Results One site was relocated and one non-cultural site was identified during the survey. No new cultural resources were identified. Site CA-SDI-11453 was relocated during the survey. The site boundary is located adjacent to the easternmost staging area near Segment 4. One core and an assayed cobble were identified towards to the top of a north-facing slope within the recorded site boundary and approximately 150 meters south of the proposed staging area. Ground visibility was 10 to 20 percent in this area and, therefore, there is a possibility that more artifacts are scattered within site boundary.

Mr. Luis Valdez Page 8 August 27, 2018 For Segment 4, ground visibility along the trail within the Bonita Golf Club was 100 percent. Road gravel, small concrete chunks, and glass fragments were noted within the trail. Towards the eastern end of the southern section of the trail, soil has been stockpiled and appears to have been brought from an off-site source. No cultural material was noted in the stockpiled soil. The footings for the National City and Otay Railroad trestle, recorded as P-37-017399, were searched for under the Sunnyside Bridge. No evidence of these could be found. It is assumed that the upgrade construction of the bridge in 1999 removed the footings. The non-cultural site was identified in Segment 4 in an area that appeared to be covered with imported soil during the construction of the bridge or the building of the access road from San Miguel Road to the Bonita Golf Club. A shellfish scatter of moderate density was noted in the soils. Shellfish species included Chione spp. and Tivella spp. The 1953 aerial photograph shows a narrower bridge in the same alignment as the current Sunnyside Bridge and the location of the non-cultural site as being a small knoll near the flow of the Sweetwater River (Nationwide Environmental Title Research, LLC 2015). The knoll has been impacted since 1953. The soil with the shell scatter appeared to have been pushed up towards the access road from San Miguel Road and to clear the east-west path that runs along the southern border of the Bonita Golf Club and continues west under the Sunnyside Bridge into Sweetwater Regional Park. No new cultural resources were noted within the APE. The entire APE has been impacted by previous grading for the perimeter trail and contouring and landscaping of the Bonita Golf Club (Segment 4), for contouring and landscaping in the Chula Vista Golf Course (Segment 3), for the construction of Bonita Road (Segments 1 and 2), and for construction of the paved parking lot of the Kaiser Permanente Medical Office. No cultural material was noted within Chula Vista Golf portion of Segment 3. Ground visibility was poor due to the turf that covers the new alignment route on tee box for the first hole and driving range near the tenth hole. No cultural material was noted in the westernmost staging area near Segment 1. A portion is covered in road gravel for the parking lot and a portion has short non-native vegetation. Ground visibility was 50 percent. No cultural resources were noted along Segment 5. This alignment area is disturbed due to previous agriculture use, grading, and construction for the Kaiser Permanente Medical Office paved parking lot, the decorative planter along Willow Street, and the fully paved Willow Street and Bonita Road. The Sweetwater River open space has patches of dense vegetation with thick surface duff, which yield low ground visibility. The closest recorded resource, approximately 50 feet from project centerline, is the Willow Street Bridge which crosses the Sweetwater River between Bonita Road and Sweetwater Road. This bridge was built in 1940 and is scheduled for replacement by the City of Chula Vista. Recommendations As stated above, according to CEQA, a significant impact is a project effect that may cause a substantial adverse change in the significance of a historical resource. Adverse changes include physical demolition, destruction, relocation, or alteration of the resource or its immediate surroundings resulting in the impairment of the resource s significance (Section 15064.5.4b, CEQA Guidelines). Mitigation measures are required for adverse effects on significant historical resources (PRC Section 21083.2). Although no cultural resources were recorded during the survey or archival review, the potential exists for encountering cultural resources during excavation activities within areas where the main will be realigned. Because of the project alignment s proximity to the Sweetwater River, a good water source for prehistoric people, the possibility of significant buried cultural resources being present is considered high. For this reason, RECON recommends the presence of qualified archaeological and Native American monitors during trenching of the new main for portions of three alignments in Segments 3, 4, and 5 that are not adjacent to the existing pipelines (Figure 4). The frequency of inspections will be determined by the Project Archaeologist in consultation with the Native American monitor and will vary based on the rate of excavation, the materials excavated, and the presence and abundance of artifacts and features.

Image source: Nearmap (flown February 2018) PARAD IS V U 54 E VA LL EY W O OD V U 125 SW EE TW AN ER M AT MIG S AN UEL Segment 4 V U 54 T CE N RAL AN TO N AW VA LLEY DA CO RR AL CA NY ON Segment 3 O RE Segment 5 W IL L O EETWATE R W 0 Project Alignment Feet 1,500 [ Potential Staging Area Areas to be Monitored FIGURE 4 Areas to be Monitored M:\JOBS4\7729\common_gis\2018_Arc\fig4.mxd 5/10/2018 fmm

Mr. Luis Valdez Page 10 August 27, 2018 In the event that unknown cultural resources or significant features are encountered during construction monitoring, the archaeological and Native American monitors will be authorized to temporarily divert trenching in the area of discovery until the significance and the appropriate mitigation measures are determined. To mitigate potential impacts to significant cultural resources, a Research Design and Data Recovery Program should be prepared by the Principal Investigator, approved by the County Archaeologist, and implemented using professional archaeological methods. Construction activities would be allowed to resume after the completion of the recovery of an adequate sample and the recordation of features. All cultural material collected during the monitoring and data recovery program shall be processed and curated at a San Diego facility that meets federal standards per Code of Federal Regulations Title 36 Part 79. After the completion of the monitoring, an appropriate report shall be prepared. If no significant cultural resources are discovered, a brief letter shall be prepared. If significant cultural resources are discovered, a report with the results of the monitoring and data recovery (including the interpretation of the data within the research context) shall be prepared. If human remains are discovered, work shall halt in that area and the procedures set forth in the California PRC (Section 5097.98) and State Health and Safety Code (Section 7050.5) will be followed. The Principal Investigator shall contact the County Coroner. Sincerely, Carmen Zepeda-Herman Project Archaeologist CZH:jg Enclosures References Cited Carrico, Richard 1995 Site Form for P-37-014373. On file at the South Coastal Information Center, San Diego State University. Nationwide Environmental Title Research, LLC (NETR) 2015 Historic Aerials. http://www.historicaerials.com/ Accessed on May 21, 2015. Rosen, Marty, Joyce Corum, Don Laylander, Alan Willis, Marilyn Colombo, and Terry Cirilo 1989a Site Form for CA-SDI-11452. On file at the South Coastal Information Center, San Diego State University. 1989b Site Form for CA-SDI-11453. On file at the South Coastal Information Center, San Diego State University. Shultz, R.D., J. Whitehouse, and T. Gross 1992 Site Form for P-37-015168. On file at the South Coastal Information Center, San Diego State University.

ATTACHMENTS

ATTACHMENT 1

Sacred Lands File & Native American Contacts List Request NATIVE AMERICAN HERITAGE COMMISSION 915 Capitol Mall, RM 364 Sacramento, CA 95814 (916) 653-4082 (916) 657-5390 Fax nahc@pacbell.net Information Below is Required for a Sacred Lands File Search Project: Sweetwater Authority 36-inch Transmission Main Replacement Project County: San Diego County USGS Quadrangle Name: National City Township: 17 South Range: 2 West/1 West Section(s): Unsectioned Portion of La Nacion landgrant Contact Information Company/Firm/Agency: RECON Environmental Contact: Carmen Zepeda-Herman Street Address: 1927 Fifth Avenue City: San Diego ZIP: 92101 Phone: 619-308-9333 Fax: 619-308-9334 Email: czepeda@reconenvironmental.com Project Description: The proposed project will replace sections of the existing 36-inch diameter treated water transmission main between an area just west of Interstate 805 and State Route 125 in the Sweetwater River Valley, Bonita, California. The majority of the 18,000 feet of pipeline to be replaced will be replaced with a 36- inch pipeline with a 5,000-foot reach of pipeline to be upsized to 48-inches as required to improve service. The construction of the transmission main will occur over public right-of-way on Bonita Road and easements and will affect two golf courses. The parking lot and a portion of the Chula Vista Golf Course amd the southern portion and the trail along the southern and eastern perimeter of the Bonita Golf Course will be impacted. http://www.nahc.ca.gov/silrequest.html

ATTACHMENT 2

ATTACHMENT 3

ATTACHMENT 4

1927 Fifth Avenue 2033 East Grant Road 5951 Encina Road, Suite 104 San Diego, CA 92101 Tucson, AZ 85719 Goleta, CA 93117 P 619.308.9333 P 520.325.9977 P 805.928.7907 F 619.308.9334 F 520.293.3051 www.reconenvironmental.com An Employee-Owned Company June 3, 2015 Mr. Frank Brown Viejas Kumeyaay Indian Reservation 240 Brown Road Alpine, CA 91901 Reference: Sweetwater Authority 36-Inch Transmission Main Replacement (RECON Number 7729) Dear Mr. Brown: RECON Environmental, Inc. has been retained by the Sweetwater Authority to conduct an archaeological survey for the 36-inch Transmission Main Replacement. The project is located in Bonita Valley, from just west of Interstate 805 to State Route 125 (SR-125), within portions of the city of Chula Vista and the unincorporated community of Bonita. The project alignment is composed of four segments, primarily along Bonita Road, but also within portions of the Chula Vista Golf Course and the Bonita Golf Club. The 36-inch transmission main replacement involves the installation of approximately 20,000 linear feet of pipeline. In most cases, the replacement pipelines would be installed within the same trench and at approximately the same depth as the existing pipelines, using the open cut trench method. The proposed project would also include the abandonment of segments of the existing water main in several locations where the transmission main will be realigned. The project is within the La Nación land grant in Township 17 South, Ranges 1 and 2 West, of the U.S. Geographical Survey 7.5-minute topographic map National City quadrangle (see attached figure). A letter requesting identification of spiritually significant and sacred sites or traditional use areas in the proposed project vicinity was sent to the Native American Heritage Commission (NAHC). No Native American cultural resources were identified in the immediate project area. A record search was conducted of the archaeological databases maintained at the California Historical Resources Information System, South Coastal Information Center (SCIC) at San Diego State University. The files at SCIC identified two prehistoric archaeological sites, one prehistoric isolated artifact, and one historic site recorded within or immediately adjacent to the proposed project area. CA-SDI- 11452 and CA-SDI-11453 were recorded as lithic and ground stone artifact scatters. Construction of SR-125 has impacted CA-SDI-11452 and most likely destroyed it. Isolate P-37-015168 was recorded as a flake. P-37-017399 consists of the footings for the National City and Otay Railroad trestle over the Sweetwater Valley after the 1916 flood washed away the bridge and tracks. This site is mapped within the project area. It is assumed that the construction of the replacement bridge removed the footings in 1999.

Mr. Frank Brown Page 2 June 3, 2015 One site and one non-cultural site were identified during the survey. No new cultural resources were identified. Site CA-SDI-11453 was relocated during the survey. This site will be avoided during construction and the area near it will be monitored. The non-cultural site was identified in an area that appeared to be covered with imported soil during the construction of the bridge or the building of the access road from San Miguel Road to the Bonita Golf Club. A shellfish scatter of moderate density was noted in the soils. Pursuant to the letter received in response from Katy Sanchez of the NAHC, we are contacting you as a potentially interested party. We would like to know if you have any concerns regarding the proposed project as it relates to Native American issues or interests. Would you have any information on sacred sites in the vicinity of the proposed project that may help us advise the client to avoid impacts to these sites? We would like to obtain Native American input early enough in the environmental process to ensure adequate time to address any concerns you may have. We would also appreciate any referrals to another tribe or person knowledgeable about the cultural resources within or adjacent to the proposed project area that may be of help in the planning process with regard to Native American concerns. Please feel free to contact me if you have questions, comments, or concerns. If we have not heard from you by June 19, 2015, we will assume that you have no comments. Thank you for your assistance. Sincerely, Carmen Zepeda-Herman Project Archaeologist CZH:jg Enclosure