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HomeMy WebLinkAboutCT 98-14; Thompson/Tabata; Tentative Map (CT) (82)BUCCQLA ENGINEERING, inc. July 9, 1999 JN84-14 Ms. Kelly Efimoff Carlsbad Municipal Water District 5950 El Camino Real Carlsbad, CA 92008 SUBJECT: POINSETTIA/THOMPSON/TABATA, CT 98-14, TENTATIVE MAP, SDP Dear Ms. Eilmcff: Thank you for meeting with Standard Pacific Homes and us last week (Friday, July 2, 1999) to discuss the tentative map issues letter from Mike Shirey (Engineering Dept.). A summary of the meeting discussion items in need of documentation follows. Your signature at the end of this letter would serve to affirm the Engineering Dept. request for CMWD documentation on sewer & water issues #3-6, & 8. #3 & #4: Wilson Engineering prepared sewer studies for both Mariners Point (1992) and this project (September 10, 1998), and concluded that at ultimate buildout-conditions for the entire tributary ? rea. the existing gravity sewers would have sufficient capacity. The September 98 study indicated that the ''ultimate" system would operate at 71% capacity which is less that the generally acceptable 75% - 80% capacity range. This conclusion is consistent with the findings in the North Batiquitos Pump Station Service Area Repon, also prepared by Wilson Engineering, dated 10-23-92, that indicated a maximum depth-to-diameter ratio within the existing gravity ?ewer wou'd be 70.percent at Master Plan buildouf conditions. In October of 1998, Gregg Linhoff of Standard Pacific Homes met with CM'Al) manager Bill Plummer and received affirmation on the study findings and it was agreed that the new facility improvements were unnccccsscay. #5: The current t.m. design for the areas north of Poinsettia would not provide the ability to gravity sewer to the north. At Lemon Leaf Drive, the existing sewer stub invea elevation at the northerly boundary is 299.2, while our proposed low point finish grade in Lemon Leaf Drive approximately 400 feet south would be -296.2. At this point in time it appears that we have two options for sewering the Lemon Leaf Drive cul-de-sac; one would be to connect to the existing 8" sewer in the Aviara/Poinsettia intersection, and the other would be to sewer westerly through the Tabata parcel into Lonicera Sreet. Per our discussion during the meeting, you stated that CMWD would prefer to wait until the ongoing road alignment issues for Tabata, Lemon Leaf, and Lonicera are settled before making a determination on which Lemon Leaf Drive sewer option is preferable. As for the proposed sewer in Lonicera St., our current t.m. design would again not provide the ability to gravity sewer to the north, as our proposed finish grade at the end of the cul-de-sac is -231.4, while the existing street grade for Lonicera Street at the northerly boundary is around 246. The current t.m. design proposes a sewer connection in the adjacent property to the west. 3142 Vista Way, Suite 301 G Oceanside, California 92056 [- 760/721-2000 CMWD Q July 91999 Poinsettia/Tabata CT 98-14 Isfues #6: The 30' wide easement in question here surrounds the old 18" and 12" waterlines crossing the Tabata fields northeasterly toward Aviara Parkway. These waterlines were abandoned (and replaced with new, realigned waterlines) up to Aviara Parkway with the construction of Mariners Point in -1997 (dwg. No. 341-3). As discussed in our meeting, CMWD would have no problem with the proposed relinquishment of easement rights for these abandoned waterlines. #8. Per last week's discussion, CMWD would normally require looped water systems in areas serving more than 19 units. Our current preliminary alignment studies for the Lemon Leaf /Tabata/Lonicera area would result in a looped system for Lemon Leaf Drive. For Lonicera Street, the current studies would result in two possible scenarios, one being a system that would complete a loop when Tabata develops, and the second resulting in a cul-de-sac with 19 units, therefore not requiring a looped system. Again, thank you for your time in both meeting with us and in reviewing this letter. Please sign on the line below, affirming our July 2 meeting notes and additional information contained hereon, again in order to satisfy City Engineering Dept. documentation requests. If you have any comments or questions regarding this letter, please contact us to discuss. Thank you for your consideration in these matters. Sincerely, M^tt John Duewel CMWD signature Date CC. Standard Pacific Homes - Gregg Linhoff Jack Henthorn Associates - Jack Henthorn and Melissa Allen JADrnk \alpha\word\Jetters\84-14cmwd-signoff.doc