Environmental Impact Statement - Sonoma Land Trust

More documents

Recommendations

Info

California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.1. Geology, Soils, and Paleontology distribution within the project area. Areas identified as Gullied land in the Natural Resources Conservation Service’s (NRCS’s) Sonoma County Soil Survey (Miller 1972) are also discussed. Uplands The site’s upland areas feature Diablo clays of varied slopes and erosional states underlain by the Upper Petaluma Formation. Soils in the Diablo Series are welldrained but are subject to land slippage. Consequently, these soils have a high erosion potential. Diablo clays are also characterized by rapid surface runoff and a high shrink-swell potential (Miller 1972). Alluvial Fans Soils on the site’s alluvial fans are assigned to the Clear Lake clay loam, 2 to 5 percent slopes, and Haire gravelly loam, 9 to 15 percent slopes, eroded. Clear Lake clay loam, 2 to 5 percent slopes consists of clays that formed under poorly drained conditions from parent material consisting of sedimentary and basic rock sources. These soils possess a slight erosion hazard, are subject to slight surface runoff, and have a high shrink-swell potential. Haire gravelly loam, 9 to 15 percent slopes, eroded consists of moderately well-drained clay loams that have a clay subsoil, and are underlain by old terrace alluvium from mixed sedimentary and basic rock sources. Runoff is medium, erosion hazard is moderate, and shrink-swell potential is moderate to high (Miller 1972). Gullied Areas Gullied land consists of gently sloping to steep, rounded hills that have been severely damaged by increased runoff as a result of overgrazing by livestock, which has in turn resulted in aggravated headcutting of gullies on hillsides. In areas where overlying soil has eroded away, the parent material of soft coastal sandstone is exposed and is subject to severe erosion (Miller 1972). Farmed and Graded Areas Farmed and graded areas in the project area consist of artificial fill overlying Bay mud. Artificial fill is in general characterized by undifferentiated man-made deposits of various materials and ages. Fills made before 1965 are typically uncontrolled 2 and consist simply of dumped materials (Graymer, Jones, and Brabb 2002). 2 Uncontrolled fill is fill that was placed without engineering oversight. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.1-6 April 2012
California Department of Fish and Game U.S. Fish and Wildlife Service Section 3.1. Geology, Soils, and Paleontology Diked Baylands The bay muds in the diked baylands are composed of Reyes silty clay, 0 to 2 percent slopes, an acidic (pH approx. 4.5), poorly drained soil. These soils originated from estuarine mudflats and marshes formed during the Holocene and, once disconnected from the tides following dike construction in the late 19 th and 20 th century, were subject to draining, oxidation, compaction, grazing, and oathay farming. Over time, the former wetland soils have gradually dried and decomposed, causing the land to subside by several feet below historic elevations. This soil type exhibits high compressibility, low shear strength, and generally low permeability but is underlain by much stronger and less compressible soils. Runoff and erosion is typically slight. Shrink-swell potential is high (Miller 1972). Geologic Hazards Primary Seismic Hazards—Surface Fault Rupture and Groundshaking The project site is not located within any Earthquake Fault Zone delineated by the State of California pursuant to the Alquist-Priolo Earthquake Fault Zoning Act (Hart and Bryant 1997), nor is it traversed by any faults recognized by the Uniform Building Code as active (International Conference of Building Officials 1997). The project site is thus considered unlikely to undergo surface fault rupture. However, Sonoma County, including the Project site, is located in the Uniform Building Code’s Seismic Zone 4, the most seismically active of the four seismic zones in the United States. A number of active faults are close enough that the site and surrounding area are likely to experience substantial seismic groundshaking during the lifespan of the Project. Faults recognized as active by the State of California and zoned pursuant to the Alquist-Priolo Earthquake Fault Zoning Act include, from east to west, the Concord Green Valley fault, 16 miles to the east; the Calaveras fault, 30 miles to the south; the Greenville fault, 28 miles to the southeast; the Hayward-Rodgers Creek fault, 3 miles to the northeast; the Maacama fault, 33 miles to the northwest; and the San Andreas fault, 18 miles to the west. The West Napa fault, which is approximately 10 miles northeast of the site, is not zoned by the state but is classified as a Type B seismic source 3 , as defined in the 1997 UBC (International Conference of Building Officials 1997). 3 Type A seismic sources are faults that are capable of producing large magnitude (M≥7.0) events that have a high rate of seismic activity. Type B seismic sources are faults other than types A and C. Type C seismic sources are faults that are not capable of producing large magnitude earthquakes and that have a relatively low rate of seismic activity. Sears Point Wetland and Watershed Restoration Project Final Environmental Impact Report/Environmental Impact Statement 3.1-7 April 2012
Page 1 and 2:
Sears Point Wetland and Watershed R
Page 3 and 4:
Sears Point Wetland and Watershed R
Page 5 and 6:
Contents List of Tables ...........
Page 7 and 8:
California Department of Fish and G
Page 9 and 10:
Page 11 and 12:
Page 13 and 14:
Page 15 and 16:
Page 17 and 18:
Page 19 and 20:
Page 21 and 22:
Page 23 and 24:
Executive Summary This summary prov
Page 25 and 26:
Page 27 and 28:
Page 29 and 30:
Page 31 and 32:
Table ES-1. Summary of Impacts and
Page 33 and 34:
Table ES-1. Continued Page 3 of 141
Page 35 and 36:
Page 37 and 38:
Page 39 and 40:
Page 41 and 42:
Page 43 and 44:
Page 45 and 46:
Page 47 and 48:
Page 49 and 50:
Page 51 and 52:
Table 1-1. List of Local, State, an
Page 53 and 54:
Table 1-1. Continued Page 3 of 3 Ag
Page 55 and 56:
Page 57 and 58:
Page 59 and 60:
Page 61 and 62:
Page 63 and 64:
Page 65 and 66:
Page 67 and 68:
Page 69 and 70:
Table 2-2. Action Alternatives Cons
Page 71 and 72:
Table 2-2. Continued Page 3 of 4 Ut
Page 73 and 74:
Page 75 and 76: California Department of Fish and G
Page 119 and 120: Chapter 3 Affected Environment and
Page 121 and 122: Section 3.1 Geology, Soils, and Pal
Page 125: California Department of Fish and G
Page 143 and 144: Section 3.2 Surface-Water Hydrology
Page 165 and 166: Section 3.3 Water Quality Introduct
Page 177 and 178:
Page 179 and 180:
Page 181 and 182:
Page 183 and 184:
Page 185 and 186:
Page 187 and 188:
Page 189 and 190:
Page 191 and 192:
Page 193 and 194:
Section 3.4 Public Health and Safet
Page 195 and 196:
Page 197 and 198:
Page 199 and 200:
Page 201 and 202:
Page 203 and 204:
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Page 211 and 212:
Page 213 and 214:
Page 215 and 216:
Page 217 and 218:
Page 219 and 220:
Page 221 and 222:
Page 223 and 224:
Table 3.5-2. Special-Status Species
Page 225 and 226:
Table 3.5-2. Continued Page 3 of 12
Page 227 and 228:
Page 229 and 230:
Page 231 and 232:
Page 233 and 234:
Page 235 and 236:
Page 237 and 238:
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Page 271 and 272:
Page 273 and 274:
Section 3.6 Land Use and Public Uti
Page 275 and 276:
Page 277 and 278:
Page 279 and 280:
Page 281 and 282:
Page 283 and 284:
Page 285 and 286:
Page 287 and 288:
Page 289 and 290:
Section 3.7 Agricultural Resources
Page 291 and 292:
Page 293 and 294:
Page 295 and 296:
Page 297 and 298:
Page 299 and 300:
Page 301 and 302:
Page 303 and 304:
Page 305 and 306:
Page 307 and 308:
Page 309 and 310:
Page 311 and 312:
Page 313 and 314:
Page 315 and 316:
Page 317 and 318:
Page 319 and 320:
Page 321 and 322:
Page 323 and 324:
Page 325 and 326:
Page 327 and 328:
Page 329 and 330:
Page 331 and 332:
Page 333 and 334:
Page 335 and 336:
Page 337 and 338:
Page 339 and 340:
Page 341 and 342:
Page 343 and 344:
Page 345 and 346:
Page 347 and 348:
Section 3.11 Air Quality Introducti
Page 349 and 350:
Table 3.11-1. Ambient Air Quality S
Page 351 and 352:
Page 353 and 354:
Page 355 and 356:
Page 357 and 358:
Table 3.11-32, Continued Page 2 of
Page 359 and 360:
Page 361 and 362:
Page 363 and 364:
Page 365 and 366:
Page 367 and 368:
Page 369 and 370:
Page 371 and 372:
Page 373 and 374:
Page 375 and 376:
Page 377 and 378:
Section 3.12 Noise Introduction Thi
Page 379 and 380:
Page 381 and 382:
Page 383 and 384:
Page 385 and 386:
Page 387 and 388:
Section 3.13 Cultural Resources Int
Page 389 and 390:
Page 391 and 392:
Page 393 and 394:
Page 395 and 396:
Page 397 and 398:
Page 399 and 400:
Page 401 and 402:
Page 403 and 404:
Page 405 and 406:
Section 3.14 Aesthetics Introductio
Page 407 and 408:
Page 409 and 410:
Page 411 and 412:
Page 413 and 414:
Page 415 and 416:
Section 3.15 Environmental Justice
Page 417 and 418:
Page 419 and 420:
Page 421 and 422:
Page 423 and 424:
Chapter 4 Consultation and Other Re
Page 425 and 426:
Sonoma Land Trust Chapter 4. Consul
Page 427 and 428:
Page 429 and 430:
Page 431 and 432:
Page 433 and 434:
Page 435 and 436:
Page 437 and 438:
Page 439 and 440:
Page 441 and 442:
Page 443 and 444:
Chapter 5 Public Involvement and Sc
Page 445 and 446:
Page 447 and 448:
Page 449 and 450:
Page 451 and 452:
Page 453 and 454:
Sonoma Land Trust Chapter 7. Refere
Page 455 and 456:
Page 457 and 458:
Page 459 and 460:
Page 461 and 462:
Page 463 and 464:
Page 465 and 466:
Page 467 and 468:
Page 469 and 470:
Page 471 and 472:
show all

Environmental Impact Statement - Sonoma Land Trust

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?