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Home My WebLink AboutPermit Correspondence 1999-10-5 .~ Engineers, Geologists and Surveyors 2535B Prairie Road Eugene, Oregon 97402 (541) 688-8322 Fax (541) 688-8087 EGR & Associates, Inc. October 5, 1999 Vern Benson 940 Highway 99 North Eugene, OR 97402 'SilPO ~~~ RE: Slope Protection Lots 4 and 5, Thurston Ridge Subdivision, Springfield Dear Mr. Benson: Please find attached two cost-effective alternatives to transition and protect the cut/fill slope between Lots 4 and 5 of the above referenced project. The slope is approximately 8 feet in height and separates two garage structures that are approximately 18 feet apart. The on-site soil is a light brown silt according to soil test data provided by Foundation Engineering, Inc. ;-. The simplest transition is to slope the soil at a 1.5:1 slope (1.5 horizontal to 1 vertical) and vegetate all exposed soil surfaces. There is sufficient room to maintain a three-foot wide level area adjacent to both structures (see attached detail). This method of slope protection is acceptable to the city as indicated in the plan review comments for the Land & Drainage Alteration permit (Journal #99-07-169). If the vegetation cannot be well established prior to the rainy season, consider applying temporary slope protection such as mulch, jute blankets, or other erosion control products. The second alternative is to utilize a landscape block retaining wall system, such as Anchor Diamond@, as shown on the attached detail. This retaining wall system can be placed up to four feet in height without requiring an engineered geogrid or geotextile soil anchoring system. A reinforced concrete footing and wall can be designed and constructed to retain the soils, however, the landscape block retaining wall system is more cost effective in this application. No major loads, such as a structure or retaining wall, should placed in a zone that extends back from the base of the wall at a 1:1 slope as shown on the attached detail. There is sufficient room to install two 4-foot high walls while maintaining at least five feet of level area adjacent to both garage structures. The two retaining walls will be at least six feet apart. . A granular drainage layer should be installed behind the wall to prevent buildup of hydrostatic pressure due to poor drainage characteristics of the soil. The drainage layer consists of a minimum 12-inches of free draining aggregate (drain rock) extending from 6-inches below the wall to within 6- inches of the top of the wall. Place filter fabric between the drain rock and October 5, 1999 Mr. Vern Benson /~ Page 2 soil to prevent infiltration of fines into the drainage layer. A 4-inch perforated pipe should be placed behind the wall; the invert located 6 inches above the bottom of the drainage layer, and drained to an approved disposal system (curb & gutter or storm drain pipe). The same slope protection alternatives can be used on the slope north of the garage on Lot 5, Retaining wall systems, such as the Anchor Diamond@, are pre-engineered and designed to retain soil as long as installed in accordance wi th manufacturer's recommendations. Our review of the slope protection alternatives does not include evaluation or design of a retaining wall system. If you have any questions, or need additional information, please give us a call at (541) 688-8322. Sincerely, " EGR & ASSOCIATES, INC. Clint Beecroft, P.E. Civil Engineer Encl: Slope Protection Alternatives R~H&v-JS /2. ~31-CfCf . v . \J; EGl!.g'~rn1;',~g~;,~~!;,!:}nc. 25358 Prairie Road Eugene. Oregon 97402 LoT ...s::. G- A R-AG.c //('C.-/// z- PROJECT 77-l1J~r-J 1<\.~ SHEET NO OF CALCULATED BY CL.J3 DATE JO-5-CJCi (541) 688-8322 Fax (541) 688-8087 CHECKED BY SCALE j.J Di-.l P. 3' -t- DATE Ve~"'A-Te: ~L.oEl~ B't.. 'f ~ 18':1; YE(.....f-r A\E.t> 5Loge J.-o-r 4 G-A~A-6.E _ 3' /L o/e,4&JJ/21 ///.,;//~ ~.. "" EG~",,'!m1!'~~tsc.~~!~f,:/nc. PROJECT lHu 2. (" I~ ^>L--i2..\ b~ (541) 688-8322 Fax (541) 688-8087 CALCULATED BY gHECKED BY SCALE Noi-JE- C1--& OF DATE 10 -5-ClQ SHEET NO 25358 Prairie Road Eugene, Oregon 97402 DATE La'\" S G}\ ~ (,..f:- 5' MIrV. · l- ///Z;t'//z NO Lo~t)S. ~ i-''''- ///>=i/1w..{.. 0"" " ~v - , IL, E:;>'::'- f TNt'/.. I . 'It 0 ;:00_ No LoAb$ 1~ .,~ 8'.,. ::- ~0 //i:.~~ /J/'i../~, - I :; " '" c~- ~ L AL..-n:f{ F~~ RlC. 'Ii.:..~ <' u - il!cF- / ~,.. 111i-//I~/lI~" J~"" /2" /lllll. , tnl4i-. 4 HI &1-{ ArlLH.O~ b\A-~",~ @ CD;<J<::.~E Te. B,-o~KS oR. &::avAL. d L.ol4 GARA~E , .s ~ I' FREE. -~AIN\NG- ~c(,.A1e. '.-.J IrH -4" PE~F. Pl1?E >T'<~o BEl-I//'I.\ b W A-l...L.. J Dct~N 7"0 bAY l...l~ .,... 111~N/z- ... 18't: t RE-r~/N/N~ 'vJ A-L-L .s.'1'~TE""" . f{OTE~ Ai-LOw ;1Jr+NUr;t-~ru"-€..p.'s /NSTAu.A \'\ulJ ,IH-SiR\l<.. \\~NS w ~EtJ / N.5 T A 1..1..\ IoJ Go R. ~ -rA-II..1I t<J" IN A l..l.. .s l" ..r "lIE "'" .. VE(...~lA-"\e E)(Po~e.b SoIL-5. 9-29-1999 9:26PM FROM LEMKE EE BENEFITS 5033938721 P.1 " .t'l0 I ~~ ~/" 6r&" ~();1 Lemke Employee Benefits Lenard Lemke 5121 Hayesville Dr, NE Salem, Or, 97305 503-393-4131 Fax 393-8721 E-Mail Llemke@Compuserve.com - - - -- September 30, 1999 EGR, In<:. Associates Beginning October 1, 1999, your health insurance <:overage will begin with Provident Health Plans. Here are a few points that can help you through the process. Later next week, you should receive your ID cards, But, until then, you Of your family member may have an appointment with your doctor. Your new group with Provident Health Plans is 43540. When visiting the doctors office, use that ID number in conjunction with the employees Social Security Number, Customer Service call 800-878-4445 and ask for Lisa Tracy or Mary Lanz, If the doctors have questions about eligibility, these two ladies can assist them also, If you need further assistance, you may call me at the above number. Lenard Lemke . 1.,. BNSin.ess since 197$ (' ~ d' -) - l' K: 9-22-1999 10:55PM ~q FROM LEMKE EE BENEFITS 5033938721 P.1 Lemke Employee Benefits Lenard Lemke 5121 Hayesville Dr, NE Salem, Or. 97305 503-393-4131 Fax 393-8721 E-Mail Llemke@Compuserve.com September 23, 1999 Shane Or Ralph FAX # 541-688-8087 Three Page FAX Enclosed are atijusted rates from the original proposal, Since the census has changed from the time of proposal to enrollment, Provident is required to re-rate the group according to state rules. You will notice a slight increase. There is a slight increase as you can see, Thanks, Lenard In Business tMce 1975