Commercial Rock Quarries. Two commercial rock quarries are covered under the ITP for a period ending on March 1, 2001. These two rock quarries are identified as Rock Quarry 1/Road 24 in the Xxxxx Creek drainage and Rock Quarry 2/Road 9 in the Xxxxxxxx Creek drainage.
1. PALCO shall continue to use engineered detention ponds and erosion control to reduce impacts on waters and riparian areas.
2. PALCO shall implement appropriate mitigation so that rock quarry operations do not result in a visible increase in turbidity in any drainage facility, work site, quarry area, etc, any of which drain to Class I, II, or III waters. Appropriate mitigation includes, but is not limited to, wet weather operating limitations, installation of sediment control structure, limitations on overburden placement and distribution, removal of spoil material, revegetation, and abandonment.
3. The site specifics of the rock quarries and their effects at the hydrologic unit scale shall be evaluated during watershed analysis. Additional mitigation, identified above, may be implemented depending on the results of watershed analysis.
4. The wildlife agencies commit to work with PALCO to process an amendment to the HCP to continue coverage of the two rock quarries after expiration of the initial two-year period.
Commercial Rock Quarries. PALCO operates two permitted commercial hard rock quarries in the plan area. The two commercial quarries are identified as Rock Quarry 1/Road 24 and Rock Quarry 2/Road 9. • Rock Quarry 0/Xxxx 24 is located in the Xxxxx Creek drainage, approximately five miles upstream from Carlotta, California. The approved Humboldt County conditional use permit and the approved mining and reclamation plan for the quarry provide for a total production of approximately 125,000 cubic yards of aggregate material. The entire quarry site includes approximately 3.5 acres. • Rock Quarry 0/Xxxx 9 is located in the Xxxxxxxx Creek drainage of the Xxxxx Creek watershed. It was operated for many years for in-house use only. Since approval of the conditional use permit, it has been mined for commercial purposes. The volume of available material in Quarry 2 is estimated at approximately 450,000 cubic yards. These two existing quarry operations will be covered by the ITPs for two years. Coverage for these operations beyond the two-year period and coverage for any additional quarry sites proposed by PALCO will require amendments to the ITPs and Plan. Quarry operations involve excavation, drilling, blasting, screening, loading and hauling. Activities ancillary to the quarry operation include road relocation, erosion control, annual closure, and final reclamation. Materials are hauled off-site and transported by truck or rail to their ultimate destination for use as slope stabilization, bedding, and road base. Operations are seasonal, with most mining occurring from April through November. Minor quarrying may occur from December through March in response to local demand for material or the need to provide material for erosion control or road stormproofing activity. Additional information about the quarries is provided in July 1998 Draft SYP/HCP, Part J of Volume II. PALCO also uses many small sand or rock sources (borrow pits) in the plan area for road maintenance, drainage facility repair, and erosion control. Because of their small size and minor impacts, these borrow pits do not require permits under federal or state regulations and are not mapped or inventoried. Activities associated with these borrow pits are part of PALCO’s road and sediment control program and are covered by the ITPs for five years after the effective date. Coverage for borrow pits beyond the five-year period will require an amendment to the ITPs.
