аЯрЁБс>ўџ NPўџџџMџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџџьЅС3 №ПEbjbj $.bvbvч]џџџџџџl   8D P$Fј€"ЂИИИИИИFHHH=…•-ЅEјF IИЅEИИИИИЅEŠ ИИКEŠ Š Š ИИИFŠ ИFŠ hŠ ђђИt p…ФJ}Чђ Ю:ђђTаE0FђаI ‚аIђŠ йCENTRAL VALLEY REGIONAL WATER QUALITY CONTROL BOARD  ADVANCE \d 5 INSPECTION REPORT 12 April 2007 DISCHARGER: U.S. Department of Agriculture, Forest Service LOCATION & COUNTY: Walton’s Grizzly Lodge-Ice Pond Dam, Plumas County CONTACT(S): George Butler, USFS Mark Beaulieu, USFS Jared Stein, Property Owner INSPECTION DATE: 6 April 2007 INSPECTED BY: Philip Woodward ACCOMPANIED BY: George Butler, Mark Beaulieu, Jared Stein OBSERVATIONS AND COMMENTS: Staff with the Plumas National Forest wish to repair and upgrade the Ramelli Ditch, which originates from the Walton’s Grizzly Lodge Ice Pond Dam. Part of the repairs include replacement of an old pipeline on a steep slope immediately below the dam and above Big Grizzly Creek. This is the same area of stream which was impacted by a sediment discharge in the fall of 2006 and which resulted in the issuance of Cleanup and Abatement Order No. R5-2006-0735 to the property owners, Denise and Robert Stein. Extensive work was performed by the landowner to remove the sediment downstream of the dam in a very short timeframe to allow for anticipated high winter flows in the stream. The work damaged some of the riparian vegetation and it was hoped the willows and bull rushes would grow back this spring and help stabilize the disturbed soil against further erosion. As such, this is a very sensitive area and any work in the area that could result in further earth disturbance must be carefully conducted. Staff with the Plumas National Forest were aware of the sensitivity of this area and had contacted me concerning the proposed work on the pipeline immediately below the dam. George Butler, the Project Engineer contacted me by telephone and e-mailed me a description of the proposed work. It appeared that adequate precautions were planned to prevent adverse impacts to Big Grizzly Creek. On 4 April 2007, I received an e-mail from Mr. Butler explaining that their contractor had encountered unstable ground on the slope between the pipeline and Big Grizzly Creek, resulting in the disturbance of much more soil than anticipated. I also received a phone call from Jared Stein on 5 April 2007 concerning the soil disturbance. I agreed to meet Mr. Stein and the Forest Service representatives on-site Friday afternoon, 6 April 2007. I arrived on-site at approximately 3:00 pm on Friday and walked the creek from the water intake for Grizzly Ranch to the base of the dam. The riparian vegetation was just beginning to sprout where the excavator had moved through the area in January. As I neared the base of the dam, there was a bench constructed a few feet from the creek to help catch rock and soil from the unstable hillside. Soil and rock was side cast on the downhill side and poised to move into the stream. Two bales of hay and a small section of silt fence had been placed within a few inches of the creek; however, it was inadequate to catch any significant sediment, which may move downslope. A small excavator had been used to construct the bench and to access the area where the old pipeline and supports had been removed and new footings for the pipeline had been constructed. I met with Mr. Butler, Mark Beaulieu (another engineer with the Forest Service) and Mr. Stein. We discussed what actions should be taken in the short term to prevent sediment discharges into the creek and a long-term fix to stabilize the hillside. Some short-term remedies had to be implemented that day as minor storms were expected over the weekend and a more significant storm was predicted for later next week. The working area is very small, approximately 10 feet wide between the failed slope and the creek. Mr. Beaulieu stated he had some hand crews available to help remove some of the rocks and dirt from near the stream; however they would not be available until perhaps Monday. In the short term, he agreed to obtain a number of hay bales and to place them near the stream to attempt to catch any sediment, which may be washed downslope. As far as a long-term fix, the slope needs to be permanently stabilized. One proposal by the Forest Service is to use the two benches, the lower one near the creek and the upper one that contains the new pipeline, to catch sediment. These benches would be mulched and sloped to drain. Possibly a jute net may be used to help establish vegetation and reduce the potential for soil movement on the slope. This area is particularly sensitive not only due to the past sediment spill, but according to Mr. Stein it is a popular area for children at their summer camp to play and enjoy the pool at the base of the dam. Access is important and no steel or wire should be used that could injure the children as they move through the area. I requested Mr. Beaulieu work with his geotechnical engineer and put together a written plan for our review on how they plan to permanently stabilize the slope. SUMMARY: While working on replacing an old pipeline leading from the Ice Pond Dam on Big Grizzly Creek for the Forest Service, the contractor triggered slope instability near the stream. The material from the slope is poised to slide or erode into Big Grizzly Creek and must be stabilized to prevent this. The area is particularly sensitive as it is also the site where a large sediment discharge occurred last fall and extensive work was required to remove the sediment and attempt to restore the stream to its previous state. The Forest Service engineers are developing a long-term plan to stabilize the site and prevent current and future threats to water quality from discharges of soil and rock to Big Grizzly Creek. ___________________________ PHILIP V. WOODWARD, C.E.G. 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