2017-046 - Approving Addendum Nos. 1 and 2

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)� OCTA ISanta Ana/Garden Grove Streetcar Project Cultural Resources Technical Nlamo Update Archaeological Resources The expanded APE does not include anyknown archaeological or paleontological resources e I ig ible fo r o r I isted in the NRHP. Ground d isturban ce wo uld not be more than five feet beneath the existing surface in most areas. The dee pest e xca va ti o ns would be 12-20 feet deep (Iikelya 36 -inch diameter boring) to accommodate OCS pole foundations, depending on soil conditions which will be determined througha geotechnical investigation. Although the APE has already been subjectto extensive d is ruption fro m previous d eve lo p m e n t a nd may contain artificial fill materials, the APE has the poss ibil ity of co n ta i nin g intact, undisturbed cultural deposits below the level of p revio us d istu rbance. As such, important a rchaeologica I resou roes may existwithin the APE. The potential exists tha t co nstructio n activities associated with ground disturbance may unearth undocumented archaeological resources. Implementation of the Mitigation Measures specified in Section 7.5 ofthe 2014 Cultural Resources Evaluation would ensure that measures are taken to minimize potential effects to archaeological resources. Therefore, no adverse effects would occur to archaeological resourcesas a resultof the design modifications. The proposed utility and storm drain modifications, the repositioning of double -track and platforms, placing single crossovers, restriping Santa Ana Boulevard, and repositioning of platforms would occur almost entirely within the street and PE ROW, which have been previouslydisturbed with pavement, utilitylines and a previous rail line. Within the street ROW, construction would require a depth of approximately 18 inches below ground surface of excavation for placement of foundation material and laying track. Additional depth of excavation maybe required for utility relocations and foundation construction for the TPSSs ata depth of five feet or less, butthis would not Iikelyencounter previouslyundisturbed soil. These areas are all located in previouslydisturbedareas with underground infrastructure along the street ROW, and the potential for the accidental discoveryof archeological resources is low. Architectural Resources The previous cultural resources evaluation for this project identified 53 significant historic properties eligible for listing in the NRHP, CRHR, oras historical resources for purposes of CEQA within the APE. Within the expanded APE, there are four previous ly identified historic properties (Table 2) and 10 properties over 50 years of age are being treated as eligible for the purposes of the current evaluation (Table 3). The construction and operation of the proposed projectwould not disrupt the essential form or i n te g rity of th e h istoric p ro perti es in the expanded APE. Further, the minor design modifications would not result in vis ual, audible, or atmospheric intrus ions beyond those noted in the 2014 cultural resources evaluation. As described in the previous evaluation, many of the proposed construction features s uch as staging and construction areas would be considered temporary or i n d i rect effe cts, since no pe rmanent improve ment wo u Id occur.Other improvements would be considered minor changes to the built environment that would not have any direct effect or physical alteration to a character -defining feature of a historic property. These types of improvements include the removal of street landscaping (e.g., trees), newtraffic signals, gated crossings, curb closures and repair, and pedestrian safety measures (e.g., cross -walks). Since construction of the proposed projectwould be temporary and would not require acquisition or July 8, 2016 1 12