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Home My WebLink AboutCT 02-01; PACIFIC VIEW CONDOMINIUMS; DRAINAGE STUDY PROPOSED PACIFIC VIEW CONDOS; 2003-09-10ALLIED EARTH TECHNOLOGY P.O.BOX 1932 • EL CAJON • CALIFORNIA 92022-1932 TELEPHONE: (619) 447-4747 • (858)541-0225 FAX: (858) 541-0254 ROBERT CHAN, P.E. DRAINAGE STUDY PROPOSED PACIFIC VIEW CONDOMINIUM SOUTHEAST CORNER OF CARLSBAD BOULEVARD AND JUNIPER AVENUE CARLSBAD, CALIFORNIA (TM NO. CT-02-01) RECEIVED SEP 1 0 2.003 ENGINEERING DEPARTMENT ALLIED EARTH TECHNOLOGY P.O.BOX 1932 • EL CAJON • CALIFORNIA 92022-1932 TELEPHONE: (619) 447-4747 • (858)541-0225 FAX: (858) 541-0254 ROBERT CHAN, P.E. DRAINAGE STUDY PROPOSED PACIFIC VIEW CONDOMINIUM SOUTHEAST CORNER OF CARLSBAD BOULEVARD AND JUNIPER AVENUE CARLSBAD , CALIFORNIA (TMNO. CT-02-01) Pre-development Surface drainage on the property is limited to those generated on site, plus illegal drainage onsite from adjacent property to the east. Area = 0.38 acres Single-family Runoff Coefficient Time of concentration (T ) c Soil Type Smin = Tc 200' = 1.0% 11 minute 0.01 miles A .40 Altitude factor Q CIA = IOO 0.40 X 4.0X 0.38 0.61 cfs Drainage study Page 2 Pacific View Condominium Illegal drainage from inlet and 6" drainage pipe on the east side of property Drainage area = 0.25 acres C = 0.70 (80% impervious. Existing residential structure and paved driveway) Q = CIA = 0.7X4.0X0.25 = 0.70 cfs 100 ====== Total predevelopment runoff Q = 1.31 cfs 100 ====== Post-development Surface drainage on the property is limited to those generated on site. Illegal drainage from property to the east has been terminated, (see attached documents) The majority of the on-site surface runoff, consisting of the majority of the roof runoff, parking lot area and some landscape areas will be directed into a storm drain aystem, to be connected to an existing 12" RCP on Juniper Avenue. Remainder of roof and surface runoff (primarily those areas fronting on Carlsbad Boulevard or Juniper Street) will be directed to sheet flow into Carlsbad Boulevard or Juniper Street. Runoff coefficient (80% impervious) 0.70 Q 0.70x4.0x0.38 Capacity of 8" dia. PVC pipe Q 2/3 1/2. i 1.49AR S J/n 1.06 cfs Drainage study Page 3 Pacific View Condominium n A R 2/3 R 1/2 0.009 0.349 0.167 0.303 0.1 (I.49)(0.349))0.303)(0.1)/0.009 1.75 cfs > 1.06 cfs o.k. Remainder of surface runoff - less than 0.3 cfs is to sheet flow into the streets. TABLE 11.--INTERPRETATIONS FOR LAND MANAGEMENT--Continued Map symbol Soil Hydro- logic group Erodibility Limitations for conversion from brusli to gras s LfE LpB LpC LpC2 LpD2 LpE2 LrE LrE2 LrG LsE LsF Lu LvF3 Md MIC MIE MnA MnB MoA MpA2 MrG MvA MvC MvD MxA OhC OhE OhF OkC Oki; PeA PeC PeC2 PeD2 PfA PfC Py Las Flores-Urban land complex, 9 to Las Flores 30 percent slopes: Urban land Las Posas fine sandy loam, ^as Posas fine sandy loam. ^as Posas fine sandy loam. eroded. ^as Posas fine sandy loam, eroded. Las Posas fine sandy loam. eroded. Las Posas stony fine sandy slopes. Las Posas stony fine sandy slopes, eroded. Las Posas stony fine sandy slopes. 2 to 5 percent slopes-- 5 to 9 percent slopes-- S to 9 percent slopes. 9 to 15 percent slopes, 15 to 30 percent slopes, loam, 9 to 30 percent loam, 9 to 30 percent loam, 30 to 65 percent to 9 percent slopes-- to 30 percent slopes- Linne clay loam, 9 to 30 percent slopes Linne clay loam, 30 to 50 percent slopes Loamy alluvial land Loamy alluvial land-Huerhuero complex, 9 to 50 percent slopes, severely eroded: Loamy alluvial land Huerhuero Made land Marina loamy coarse sand, Marina loamy coarse sand, Mecca coarse sandy loam, 0 to 2 percent slopes Mecca coarse sandy loam, 2 to 5 percent slopes Mecca sandy loam, saline, 0 to 2 percent slopes Mecca fine sandy loam, 0 to 2 percent slopes, eroded- Metamorphic rock land Mottsville loamy coarse sand, 0 to 2 percent slopes-- Mottsville loamy coarse sand, 2 to 9 percent slopes-- Mottsville loamy coarse sand, 9 to 15 percent slopes- Mottsville loamy coarse sand, wet, 0 to 2 percent s lopes. 01ivenhain Olivenhain 2 to 9 percent slopes 9 to 30 percent slopes 30 to 50 percent slopes — to 9 percent slopes: cobbly loam, cobbly loam, Olivenhain cobbly loam, 01ivenhain-Urban land complex, 2 01ivenhain Urban land 01 iveiihain-Urban land complex, '.) to 30 percent slopes: Olivenhain Urban land Placentia sandy loam, 0 to 2 percent slopes Placentia sandy loam, Placentia sandy loam, Placentia sandy loam, Placentia sandy loam, slopes. I'lacentia sandy loam, slopes. Playas 2 to 9 percent slopes 5 to 9 percent slopes, eroded-- 9 to 15 percent slopes, eroded- thick surface, 0 to 2 percent thick surface, 2 to 9 percent D D D A A B D A A A D D D D n D u D D D D D D See footnotes at end of table. 36 Moderate 2- Moderate 2- Moderate 2- Moderate 2- Moderate 1- Moderate 1- Moderate 1- Severe 1 — Moderate 2- Severe 1 — Severe 16-- Severe 1 — Severe 1 — Severe 2--- Severe 2--- Severe 16 Severe 16 Severe 16 Severe 16 Severe 1-- Severe 2-- Severe 2-- Severe 2-- Severe 2-- Severe 16- Severe 16- Severe 1-- Severe 9— Severe 9— Severe 9— Severe 9— Severe 16-- Severe 16-- Moderate 2 Slight. Slight. Slight. Slight. Slight. Moderate. Moderate. Moderate. Moderate. Moderate. Slight. Severe. Severe. Slight. Sliglit. Severe. Slight. 4/ Slight. 4/ Slight. AJ Slight. 4/ Slight. Slight. Moderate. Slight. Slight. Slight. Slight. Slight. Slight. RUNOFF COEFFICIENTS (RATIONAL METHOD) DEVELOPED AREAS (URBAN) Coefficient, C Soii Group Land Use A B Q D Residential: Single Fannily .40 .45 .50 .55 Multi-Units .45 .50 .60 .70 Mobile Homes .45 .50 .55 .65 Rural (iots greater than 1/2 acre) .30 .35 .40 .45 Commercial 80% Impervious .70 .75 .80 .85 Industriai 90% Impervious .80 .85 .90 .95 NOTES: (11 Soil Group maps are avaiiabie at the offices of the Department of Public Works. Where actual conditions deviate significantly from the tabulated imperviousness values of 80% or 90%, the values given for coefficient C, may be revised by multiplying 80% or 90% by the ratio of actual imperviousness to the tabulated imperviousness. However, in no case shall the final coefficient be less than 0.50. For example: Consider commercial property on D soil group. Actual imperviousness = 50% Tabulated imperviousness = 80% Revised C = 50 x 0.85 = 0.53 80 lV-A-9 APPENDIX IX Updated 4/93 U/e^/?/^ ^£>F/PS O^F^l£>^//^ r/MF OF FLOW OUFVFS G/^-rr? • lir/rg/j^ a/" F/o^ • JOO // o/ £000/"/. O • SO SAN DIEGO COUNTY DEPARTVENT OF SPECIAL OiSTR'CT SE R V ; C E S DESIGN MANUAL URBAN AREAS OVERL.AND T'ME OF FLOW CURVES APPROVED -Il 'JL. OATE APPENDIX X COUfJTY OF iAN DIEGO DEPARTMENT OF SANITATION & FLOOD CONTROL 10O-YEAR B-muk PUEmimmi 'W-^ ISOPLUVIALS OF 100-YEAR 6-HOUR SiPiT/iTion m inms OF AW I.-.:C!I Prep U.S. DEPARTMEN 30' a by ' t^ROLOGV. NATIONAL WEATHEK SERVICE COUNTY OF SAN DIEGO DEPARTMENT OF SANITATIOM S- FLOOD CONTROL 100-YEAR 24-!10l|R PRECIPiTATIOrj -2Q-^IS0PLUVIALS OF 100 -YEAR 24-imUR PRECIPITATIOM IM EfiTMS GF AN INCH Prepo U.S. DEPARTMLN NATIONAL OCEANIC AND AT.-joSPUERIC ADMINISTRATION SPECIAL STUOIES BKANCII. OKKICIi OF llfDIJOLOCV, NATIONAL WEATHEK SERVICE 1 111" 'iV 30' 17' in' 1 16' - r INTENSITY-DUMiiON DESIGN CHART Thrmirir.r.iiiiiir:. . . i' i i. lu I Li i n I nniin, i Equation: I = 7.44 D '•^'^^ I » Intensity (Xn./Hr.) = 6 Hr. Precipitation (In.) D » Duration (Min.) CTl I O CZ -% -o ~f ro n Ol o 3 3 n rr n> l/l Directions for Application: 1) From precipitation naps detennine 6 hr. and 24 hr. amounts for the selected frequency. These maps are printed in the County Hydrolog)' Manual (10, 50 and 100 yr. maps included in th Design and Procedure Manual). 2) Adjust 5 hr. precipitation (if necessary) so that it is within the range of 45% to 652 of the 24 hr. precipitation. (Mot r.pplicable to Desert) 3) PlDt 5 hr. precipitation on the right side of the chart. 4) Draw a Hne through the point parallel to the plotted lines. 5) This line is the intensity-duration curve for the location being analyzed. Application Form: 0) Selected Frequency yr. 1) Pfi = ^'^ i"'. P24= « *PA ' J£^^* 2) Adjusted *Pg= ^3 24 in. mm. in/hr. *N^t Applicable to Desert Region APPENDIX XI IV-A-14 Revised 1/85 May 22, 2003 Mason family trust 550 w. "c" St. #1770 San Diego, Ca. 92101 Dear Mason family trust. My name is James Zathas, the owrier of t.hc^ thrc*; v.'^cant lots .?.dj::.cer.<: co tha i.orth of your property located at 3770 Carlsbad blvd. in Carlsbad. I am in the process of starting grading to bvild six condomi>"»i"ni units but before I get the permit a problem has to be corrected. The T?^obl€'ra is a sizz inch fcoel pipe ctalectinj surface water xn tronc of your garage,, going under tbe gar&gs and draining into my property. I have been advised that w-Kcpveir pnt the pit's draiuir^'^ into iT.y property ccji:3ti •ju.tsi:-. an illegal act and therefore "i ain " requesting as a good neighbor to reirvove- riai-'I pJ.pa so thf', I pro\r=:fc\ with the grading wicftin a Tt'cJiith from now. Should you like to discuss the issue further or have anv crieR«s4?3atKa or need assistance to remove tha p:p« plesise Cc-.ll me at 619-7l9-if4«f.' OIT T.'firJ t& J~0 1"^'* =»>N*-»^r<:* ^ Your cooperation and speedy solution to the abovesaid problem wilJ be very much appreciated Sincerely James Zathns Law Office of Dan Konnerrh Dan Konnerch, Attorney Ai Law '>/1 Utesrwood Drive Oceanside. CA 92054 (;60) 529-0703 Ju;;e 2 7, 20U3 R-E: A.PN #204-25!-04; APN #204-25,1-05, Permission to entsr property and consent ta ir.ica.'iation of stopper on water pipe Dear Mrs. Beckham: r represent Mr Zathas in the above-entitled matter. Both Mike Collimore and yourself wer- ve,^ helpful m resolving this simple issue over the weekend. Mr. Zathas is very concemed about his' inability, to g^t ,;he permits he nceos very soon. We also desire not to creat- imi,euir.^».-.s - de'ay. to r^rrow in .ny way Conscqi>ently, I rtrongly believe the solution found to 'this very .cover the pipe with an extremely inexpensive .stopper is a cheap and logica' vcluiion to fhi< problem for all the parties involved. With the pine stnnned ihp ("iry nf Parlcha.H will iii^pK, .^.yr^rr.^,^ tUr. u„ i., u they will see it. there is no possibility that water would pass through it. The sellers will be unaffected. The buyers wili be able to tear out the old pipes and redo them when they choose to improve the property at absolutely no additional expense to them. 1 am asking tliat both parties sign a release allowing Mr. Zathas to enter the property and install a pipe stopper that costs an estimated $4.00 from a home-supply store Aftc I receive the signatures from both the buyer and the sellers, I will forward both documents to escrow 1 foresee no problems and delays whatsoever with escrow closure provided we receive the documents as soon as possible. The installation could take as little as a few minutes. Please find attached an agreement to be signed by both parties in escrow. Although I foresee no problems, should yeu h9vt ,ny qie.'^tio is pb>v;t:..'e ai (76C, 529-0703 or on my ceil phone at (760) 473-85) 5 rr- Dan Konnerth, Esq. Mike Collimore, Ranch and Sea Realty 2963 Carisbad Boulevard Carlsbad, CA. 92008 CC: James Zathas Zathas! I 01./18.'2083 15:57 16192391706 KONMERTH ESG. PAGE 82 I herfby ai!thcnr« and consent to the following activity and alteration to the property located at 3770 Carlabad Blvd.. in Carlsbad CA and legally described as APN Ms 204- 251-04 and 204.2.51-05: 1> i o allow Mr. Zathas and his \vorker(s), if any, full rlghti of ingress and egress onto thi ahova at.Vwi ibcd prapcfty for thc purpose of installing a "stopper" on a water pipe; diiu 2) Cftmsn*. tn tht in^taitation of a small "stopper" device oo the water pipe which •Ira'a". on'o the adjacent property ovmnd by Mr, Zathas. r 5;7, ±0 ^y.. ;c:utor/execiitrix of the Mason Family Trust and duly authorized to consent to these activities which affect my property. //•' T^-ME 'bpe.ii^ :>u-flZ£Jol'^'''''' D\TFD (Hx(:.';Htor.^n?ie.;utj i>. or t-nthori t.>d pe^ivP ni--df,i ' M{ti!tJfi Fastily Trurt") NAM" DATED .4v<.n''n-Jtevut::7«. cr ;iut.hori.ted p.rrsor ijnori "Million Fa:-n'1y T";st") 'Q. HDWd '053 Hia3NN0>1 NtfC 9nj I6F;t:6I9T Sg:^T geBc/ZT./lO