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Home My WebLink AboutCT 04-15; LA COSTA GREENS NEIGHBORHOOD 1.07; SUBDRAIN RECOMMENDATIONS TO MITIGATE POTENTIAL WATER CONDITION; 2006-04-17c-c Q'1-IS CONSULTATION: SUBDRAIN RECOMMENDATIONS TO MITIGATE POTENTIAL SHALLOW PERCHED WATER CONDITION VILLAGES OF LA COSTA - THE GREENS NEIGHBORHOOD 10 • CARLSBAD, CALIFORNIA PREPARED FOR K. HOVNANIAN HOMES OF CALIFORNIA SOLANA BEACH, CALIFORNIA. APRIL 17, 2006 PROJECT NO. 06403-52-24 GEOCON I (46) INCORPORATED CONSULTANTS I Project No; 06403-52-24. April 17, 2006 I - K. Hovnanian Companies of California. . . . . .. 420 Stevens Avenue, Suite 170, Solana Beach, California 92075 '. . . S I Attention Mr. Jim Norum Subject: VILLAGES OFLA COSTA - THE GREENS . * ... . . NEIGHBORHOOD 1.07 •. - .- ., -... .- I.. . CARLSBAD,-CALIFORNIA . . . CONSULTATION: SUBDRAINRECOMMENDATIONS TO MITIGATE POTENTIAL SHALLOW PERCHED WATER CONDITION - ii Gentlemen In accordance with your request, we have ieviewed the grading plans. for The Greens, Neighbor- hood 1.07, prepared by Hunsaker and Associates. The purpose of our review was to evaluate the potential for a shallow groundwater (perched) and/or wet soil condition to occur and to provide recommendations to mitigate this. potential condition. Criteria used to evaluate areas of 'potential seepage and/or wet soil conditions consisted, of the following: Undercut lots situated at the toe of a cut slope where landscape irrigation on the slope could potentially result in water perching on the underlying formational .deposit at the lot below. . Lots located at the toes of moderate to high (10 feet or greater) slopes, both cut and fill. Daylight fill lots where natural drainage may impact the rear of the lots and/or seepage at the contact between the topoils and native soils could enter the lot. 1 . Using the above criteria, ow For those lots, we recommend that a if e I should be noted that 5 u:,,fit the cnteria provided above; 'however it is our o'-pinion, that the stability fill and associated The approximate locations of the recommendl sub'drains are depicted on a modified copy of the As-Graded Geologic .: . Map for,the project (Figure 1); I .The subdrains should be placed at the toe of slope in each rear yard in accordance with the 'attached * Figure 2. In addition, a vertical riser (cleanout) should be placed near the corner of each lot to provide access for future pipe clearing (if necessary). The riser -should be terminated at the top of the gravel layer and capped. The subdrairis should drain at a minimum gradient .of 1 percent and be connected to - a suitable -outlet (i.e., storm dfain structure) or daylighted to open space (if appropriate). Outlet pipes - should consist of solid PVC pipe. A lug of Portland Cement concrete, extending at least 6 inches • 'IS ' 5 ,6960 Flanders Drive 0 San Diego, California 92121-2974 0 Telephone (858) 558.6900 • Fax (858) 558-6159 AS:SR:anh Enclosures: Figures 1 anu beyond the crushed gravel that surrounds the subdrain pipe, should be placed where the perforated pipe connects to the solid outlet pipe. . Should you have questions regarding this consultation, or if we may be of further service, please contact the undersigned at your convenience. Very truly yours, . S GEOCON INCORPORATED S AU... Shane Rod cker Um CIO (2) Addressee S (2) Hunsaker and Associates Attention: Mr. David Blalock Project No. 06403-52-24 - 2 - April 17, 2006 GE000N INCORPORATED VILLAGES OF LA COSTA - THE GREENS I GEOTEcHNICAL CONSULTANTS NEIGHBORHOOD 1.07 I 6960 FLANDERS DRIVE- SAN DIEGO, CALIFORNIA 92121-2974 CARLSBAD, CALIFORNIA PHONE 858 558-6900 - FAX 858 558-6159 8 JH DSKJE0000 DATE 04 - 17-2006 PROJECT NO. 06403 -52 -24 FIG. 2 :