15 ATTACHMENT 9 - Laserfiche WebLink

ATTACHMENT 1 ~~I Environmental • Geotec6nical • Special Inspections • Materials Testing • $EtlvvnvG NORT1)ERN CALIl70RNIA SINCE 1969 ~ ,, r -~ ._~ Project No. 9929.G SAN JOSE 22 June 2007 322 Piercy Road San Jose, CA 95138 jVjT, John McInnes Phone: (408) 362-4920 Fax: (408) 362-4926 JMA Architects 933 South Pacific Coast Highway Laguna Beach, CA 92651 LrvExMOxE 257 Wright Brothers Ave. Livermore, CA 94551 Phone: (925) 243-6662 Subject: Proposed Residential Subdivision Fax: (925).243-6663 Lot 27, 1630 Vineyard Avenue Pleasanton, California SACRAMENTO Evaluation of Dry Wells 4200 N. Freeway Blvd. Suite 2 Sacramento, CA 95834 Phone: (916) 564-7809 Dear Mr. McInnes: Fax: (916)564-7672 At your request, we are presenting herein our evaluation of the use of dry wells for the ~"~"'''D estate lot at the subject property. 7700 Edgewater Drive Suite 847 Oakland, CA 94621 It is our understanding that it is proposed to construct several dry wells within the Phone: (510) 633-1332 Fax: (408) 362-4926 estate lot to discharge all roof and some surface drainage water, in lieu of collecting into a solid pipe system to a storm drain system. FRESNO 4339 N.SC;o1dmOSlabeBlvd The materials encountered in the test pits excavated in the estate lot vicinity Fresno, CA 93722 Phone: (559) 271-0773 encountered inter-bedded gravels, sands, silts, and clays. The presence of gravels and Fax: (559) 271-0763 sands would provide good percolation. WEBSrrE In concept, the use of dry wells for roof and surface water discharge is acceptable. www. terrasearchinc. com However, additional subsurface investigation work is needed to evaluate the actual E-ice, percolation rate at each proposed dry well location to design the dry well. Due to the info@terrasearchinc.com relativity steep terrain this work will need to be done after the pad has been rough graded.