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Home My WebLink AboutCDP 2017-0018; POLZIN RESIDENCE; PALEONTOLOGICAL RESOURCE AND MONITORING ASSESSMENT POLZIN FAMILY RESIDENCE; 2016-11-17A, . !!!5!!!r!!!,a!!!n!!!!!!F.!!!S!!!m!!!!!!it!!!h!!!a!!!n!!!d!!!!!!A!!!s!!!s!!!o!!!c!!!i a!!!t!!!e!!!s ,!!!!l!!!n!!!c!!!. !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! R Archaeology I Biology/ History/ Fafeontology / Air Quality/ Traffic/ Acoustics 17 November 2016 Mr. Joe Polzin P.O. Box 268 Temecula, California 92593 MAR 2 7 2017 ,· '· . Subject: Paleontological Resource and Monitoring Assessment, Polzin Family Residence, 4382 Adams Street, Carlsbad, San Diego County, California (APN 206-180-040) Dear Mr. Polzin: ·--' A paleontological resource and monitoring assessment has been completed for the Klovansih family residence project site (Assessor's Parcel Number [APN] 206-180-040) located on the 4300 block of Adams Street in the city of Carlsbad, San Diego County, California (Attachments 1 and 2). The project site is located near the western edge of projected Section 8, Township 12 South, Range 4 West, San Bernardino Base and Meridian, as shown on the U.S. Geological Survey 7.5- minute, 1 :24,000 scale, San Luis Rey, California, topographic quadrangle map (Attachment 2). The parcel comprises about 0.345 acre on the east side of Adams Street, and overlooks Agua Hedionda Lagoon. Pre-existing family residences are present to the north and east and a vacant lot is adjacent to the southeast. Geologically, the basement rocks in the area are mapped as the middle Eocene (-38 to 48 million year old) Santiago Formation (Attachment 3, after S.S. Tan and M. P. Kennedy, 1996, Geologic maps of the northwestern part of San Diego County, California: California Division of Mines and Geology, DMG Open File Report 96-02, pl. 1). The Santiago Formation contains a variety of lithologies, including ones derived from marine, estuarine, and terrestrial environments. Eocene sediments are exposed along the water's edge on the shore of the lagoon. Much of the coastal area in this part of the county is also overlain by a thin veneer of Pleistocene marine terrace sediments that are not always mapped as such, but are evident based on the planar terrace geomorphology. A paleontological collections and records search conducted by the Department of Paleontology at the San Diego Natural History Museum (SDNHM) in San Diego did not identify any previously recorded fossil localities within the project boundaries. The closest fossil locality recorded by the Department of Geological Sciences at San Diego State University (SDSU loc. 682) is located approximately 0.45 miles to the southeast along the edge of Agua Hedionda Lagoon, and yielded a fauna of Pleistocene marine invertebrate fossils (T. D. Grotts, 1981, Unpublished SDSU Master's thesis, p. 30, fig. 8). In addition, the SDNHM's locality maps show one fossil palm locality less than a mile distant to the east-northeast (SDNHM unnumbered) and another Eocene locality (SDNHM loc. 3279) to the north-northeast just outside the one-mile radius, both in the Santiago 14010 Powa9 Road, Suite A, Powa9, CA 9206+; Phone (858) 679-8118 or (,<ryl) 681-9950; Fax (858) 679-9896; www.bfua-ca.com f>usiness Office: 1+678 Ibex Court, San Diego, CA 92129; Phone (858) +s+-0915; Fax (858) +B+-0988 Brian F. Smith and Associates, Inc. -Page 2 Formation. In addition, about a mile to the east to northeast, the University of California Museum of Paleontology collected numerous Eocene vertebrate fossils from the area of the Laguna Riviera housing development in the 1960s. The fossils from these collections, which included bird, turtle soft-shelled turtle, crocodile, tapir, and brontothere, were named the "Laguna Riviera local fauna" and are discussed in a number of published reports (e.g., D. J. Golz, 1976, Natural History Museum of Los Angeles County Science Bulletin 26; Golz and J. A. Lillegraven, 1977, University of Wyoming Contributions to Geology, v. 15, pp. 43-65; S. L. Walsh, 1996, Middle Eocene mammal faunas of San Diego County, pp. 75-119; and others). The SDNHM also contains numerous collections of Eocene vertebrate and invertebrate fossils from the Santiago Formation in areas just east of Agua Hedionda Lagoon, some of which are also discussed by Walsh (1996). It is apparent that the Santiago Formation is abundantly fossiliferous throughout this region. In addition to the numerous documented Eocene fossil localities in the region, Pleistocene marine invertebrate fossils, such as bivalve and gastropod mollusks, are present on the coastal marine terraces in the area. The only recorded Pleistocene fauna from around Agua Hedionda Lagoon is SDSU loc. 682, mentioned previously, but all of the other lagoons and estuary systems along the coast, including those of Soledad Canyon (Torrey State Reserve), San Dieguito River, San Elijo Lagoon, Batiquitos Lagoon, Buena Vista Lagoon, and in Oceanside have yielded fossiliferous marine deposits that date to one of the earlier warm-water interglacial periods of the last half- million years. Given that these sea level events occurred globally, and that there is no structural geologic evidence to preclude deposition around Agua Hedionda Lagoon, it is reasonable to assume that fossiliferous marine deposition also occurred locally, although perhaps not yet identified. Tan and Kennedy (1996) show extensive areas of marine terrace sediments (Qt1 and Qti on Attachment 3) around Agua Hedionda Lagoon. Because of the "high paleontological resource sensitivity" of the middle Eocene Santiago Formation and of Pleistocene marine terrace sediments (T. A. Demere and S. L. Walsh, 1993, Paleontological Resources -County of San Diego; and R. A. Stephenson et al., 2009, County of San Diego Guidelines for Determining Significance [ of] Paleontological Resources), full time paleontological monitoring of mass grading and excavation activities, including utility trenching, etc., in areas so mapped should be required to mitigate any adverse impacts (loss or destruction) to potential nonrenewable paleontological resources (i.e., Pleistocene and Eocene fossils). A Mitigation Monitoring and Reporting Program (MMRP) consistent with the provisions of the California Environmental Quality Act (CEQA), regulations currently implemented by the City of Carlsbad, and proposed guidelines of the Society of Vertebrate Paleontology should be implemented for this project. Sincerely, (}?~ \c:<-------; George L. Kennedy, Ph.D. Senior Paleontologist Attachments: Index maps, geologic map I I I I I I I I I I I I I I I v . ~ ~ ~ ~-IS c <. ~ Project Attachment 1 General Location Map The Polzin Residence Project DeLorme (1 :250,000) 5 miles I I I I I I I I I I I I I I I I I --------7 -·, I •> 10 ,= \ + c:.:-~r--;-.:.,..::..-m-\~1r~~*"~~~~~__;,~~.-~-=~r-~~~.,_,,,___,f---¼++-i-\,,"'"'""r,'"""-i,i,M,I I=: j8 I I IQ I< ·= 1:S ,~ ' I I Attachment 2 Project Location Map The Polzin Residence Project USGS San Luis Rey Quadrangle (7.5-minute series) 1000 o ·1 I I I " I I I I I ·1 ... Iv < I '('_ ,. t ··s:. r..,j • ·r .-::... I, . .. ! ;il ·'' I I I I I I I I I I I I .-.~ : .., ,:.·':.·· ·V Attachment 3 Geologic Map The Polzin Residence Project Geology after Tan and Kennedy ( 1996) t '1 r'""I 0 I' '" 0 1000 2000 ft