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South Quarry Revegetation Plan MITSUBISHI CEMENT CORPORATION: SOUTH QUARRY REVEGETATION PLAN 4 November 2010 Prepared for: MITSUBISHI CEMENT CORPORTATION 5808 State Highway 18 Lucerne Valley, CA 92356 Contact: David Rib, Environmental Coordinator (760) 248‐5184 [email protected] Prepared by: ASPEN ENVIRONMENTAL GROUP 201 North First Ave., No. 102 Upland, CA 91786 Contact: Scott D. White, Senior Biologist (909) 949‐3686 [email protected] INTRODUCTION Mitsubishi Cement corporation (MCC) proposes to develop a new limestone quarry (the South Quarry) and associated facilities (e.g. a haul road and supply and equipment storage areas) in the northern San Bernardino Mountains (hereinafter the South Quarry and associated facilities are referred to as the “Project”). The Project would be predominantly on public land managed by the United States Forest Service (USFS) San Bernardino National Forest (SBNF) and will require approval of a Plan of Operations by USFS and a Mining and Reclamation Plan by San Bernardino County. Except for a short stretch of haul road, the proposed Project site is located on land consisting of unpatented mining claims, managed by USFS, SBNF. To date, some core sample drilling and related disturbance has occurred, but none of the area has been substantially disturbed. MCC is the owner and applicant for the proposed quarry expansion. This Revegetation Plan was prepared under contract to MCC to supplement the South Quarry Mining and Reclamation Plan Application, in compliance with the California Surface Mining and Reclamation Act (SMARA). In addition to SMARA compliance, this Revegetation Plan is cited as a recommended mitigation measure in the Proposed South Quarry: Biological Technical Report (Aspen 2010) submitted concurrently for San Bernardino County=s project review under the California Environmental Quality Act (CEQA). MCC currently operates one limestone quarry (the East Pit) and a second quarry (the West Pit) was approved in 2004 and is currently under development on public and private land in the same area. MCC also operates a cement plant adjacent to the existing quarry. The proposed Project would be located southwest of the existing East Pit. The cement plant would not be affected. The total footprint of the Mitsubishi Cement, proposed South Quarry 1 Aspen Environmental Group Revegetation Plan 4 Nov 2010 proposed South Quarry, including a berm at the southern quarry margin, is approximately 130 acres. Project haul road construction (including cut and fill slopes) would cause additional disturbance of approximately 20 acres. Project operation is expected to cause rock and debris roll‐down onto undetermined acreage downslope of the northern Project margin and haul road. Except for a short stretch of haul road, the proposed Project site is located on land consisting of unpatented mining claims, managed by USFS, SBNF. The proposed South Quarry site is north of Burnt Flats, south of the existing Cushenbury East Pit and west of State Highway 18, on the steep northern slope of the San Bernardino Mountains. It is about four aerial miles north of Big Bear City, and nine aerial miles southeast of Lucerne Valley. Elevation ranges from about 5000 feet at the lower end of the proposed new haul road (i.e., the southwest corner of the existing Cushenbury East Pit) to about 6650 feet at the southeast corner of the proposed Project site, near the historic Mohawk Mine site. The entirety of the proposed Project will be located in Sections 14, 15, 22, and 23 (Township 3 North, Range 1 East; shown on the USGS 7½‐minute Big Bear City topographic map). Adjacent lands are generally public open space managed by the USFS. Within the site’s elevational and geographic area, the northern San Bernardino Mountains support a mosaic of shrublands and woodlands, including: desert‐transition chaparral, generally dominated by cupleaf ceanothus, California juniper, bitterbrush, flannelbush, canyon live oak (shrubby form) and bigberry Manzanita; montane desert shrublands dominated by Great Basin sagebrush or rabbitbrush; and woodlands dominated by singleleaf pinyon and shrubby canyon live oak, often with high cover of curlleaf mountain mahogany. These habitats in the general area support a diverse assemblage of vertebrate wildlife. Characteristic reptiles of the area include common lizard species such as western fence lizard, side‐blotched lizard, and western whiptail. Several snake species, including southwestern pacific rattlesnake, California whipsnake, coachwhip, and gopher snake, also occur regularly in the area, though they are less‐ commonly observed due to their largely nocturnal behavior. Typical bird species of the area include red‐ tailed hawk, mourning dove, and house finch. Mammals of the area included desert woodrat, antelope ground squirrel, mule deer, mountain lion, American badger, and Nelson’s bighorn sheep. Limestone deposits in the northern San Bernardino Mountains, including the Project site, are within the Carbonate Habitat Management Area. This area is defined in the Carbonate Habitat Management Strategy (CHMS; Olson 2003), which was prepared cooperatively with participation by mining operators, the BLM, the San Bernardino National Forest, and the County of San Bernardino to facilitate economic limestone mining while conserving federally listed threatened and endangered carbonate‐endemic plant species. This revegetation plan conforms to revegetation guidelines and success criteria described in Appendix E of the CHMS. Mitsubishi Cement, proposed South Quarry 2 Aspen Environmental Group Revegetation Plan 4 Nov 2010 EXISTING CONDITIONS Topography and Hydrology: The Project site is on the steep northern face of the San Bernardino Mountains. Elevation ranges from about 5000 feet at the lower end of the proposed new haul road (i.e., the southwest corner of the existing Cushenbury East Pit) to about 6650 feet at the southeast corner of the proposed Project site, near the historic Mohawk Mine site. Adjacent lands are generally public open space managed by the USFS. The dominant landform is the steep north‐facing mountainside. Average slope is about 35% (about 1000 vertical feet per 2800 horizontal feet). Runoff that originates on‐site and upslope from the Project area flows northeast into unnamed tributaries to Cushenbury Canyon or west into Marble Canyon (also a tributary to Cushenbury Canyon). A delineation of jurisdictional stream channels within the Project site and surrounding areas has been prepared by (Glenn Lukos Associates 2010). Marble Canyon and its tributaries are state‐jurisdictional streambeds, but most or all jurisdictional area within the proposed project footprint is on the access road below the proposed quarry. There are no on‐site or upstream land uses that would affect surface or subsurface water quality for revegetation purposes on‐site. No channels within the Project area are shown as blueline features on the USGS topographic map (USGS Big Bear City topographic map). Geology: The South Quarry’s primary product will be cement‐grade limestone. This commercial‐grade material occurs with a variety of other rock types, including non‐commercial grade limestone or similar carbonate minerals (dolomite) and a variety of granitic rock types. It is often necessary to remove these materials (overburden) to access the commercial quality limestone. Overburden is expected to be minimial and will be deposited within the quarry. No new overburden stockpile areas are proposed. Existing disturbance: With the exception of some soil disturbance resulting from exploratory drilling, the Project site is undisturbed by mining or other prior land uses. Climate: The site is in the northern San Bernardino Mountains, largely in the “rain shadow” of the high ridges to the south and west. The climate is generally Mediterranean in character, influenced by the warmer and drier Mojave Desert to the immediate north. Average annual precipitation is about 12 inches (less at the lower elevations; more at higher elevation) but year to year variance is high. Most precipitation occurs during winter storms. At the higher elevations a portion of winter precipitation falls as snow, which may persist for several months on steep north‐facing slopes. Summers are generally dry, except for occasional but undependable summer thundershowers (Minnich 1976; Minich 1986; Wangler and Minnich 1995; Neel 2000). Soils: Much of the Project site (i.e., on the steep mountainside) is covered by rock outcrops without soil cover. Where soil is present, it is generally shallow (ca. 0.8 ft.; Kielhold 2008). These soils developed in place from limestone or granitic bedrock. Soils throughout the area are high in gravel and rock content; high in calcium content and pH; and relatively low in nitrogen and phosphorous content (see Neel 2000 and attached sample data). These soils tend to be relatively poor substrate for many native plants. In Mitsubishi Cement, proposed South Quarry 3 Aspen Environmental Group Revegetation Plan 4 Nov 2010 general, undisturbed native limestone soils in the region support more open and less diverse vegetation than nearby granitic soils. Five listed threatened or endangered plants and several other special status plant are endemic or nearly endemic to similar soils in the region (Special Status Plants & Animals, below). Presumably the chemical composition of limestone and similar carbonate soils is a direct or indirect element of habitat suitability for these plants. Limestone is not toxic to most native plants and does not prevent plant growth. Limestone mining
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