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Sep �2 11 1a: 32a 650 595 5066 p. 2 <br /> 8.B. - Page 156 <br /> 780 Mantague�xpwy., Suite 205 <br /> � Ea�th Sys���s Pacific San Jose, California 85131 <br /> '�!� (408)934-9302•�ax(408)94&-4589 <br /> �maif:esp@earthsys.com <br /> Septerrabex 12,2011 File No. SH-11407�SA <br /> Mr. Jack Cha�mberlain ���",-;`��--�- <br /> �fl L� :tl� � � �I C�- <br /> The charta.berlain Group � <br /> 65S Skyway Road, Suite 230 <br /> San Carlvs, CA 94074 ;�;�t� � � <br /> ���� <br /> vl"€`� o� r;��.�.vc�o� Gt�� <br /> PROJECT. Valo#a Road 5-�at Subdivision �1�^��!�_',��_���s!�c�5 <br /> I410 Valota Road � <br /> Redwood City, California <br /> SUBJI�CT: Response to Cify Plan Review Comments <br /> REFERENCE: Soil Engineering�tudy, Valata Raad 5-Lof Residenfia�Development, 1410 <br /> Valota Road,Redwood Czty, Ca�ifornia,by Earth Systems I'acifrc, dated <br /> necember 9,2Q10 <br /> Dear Mr. Chamber�ain: <br /> As you requ�sted, Earth Systems Pacific has pxepared this Iett�r to respond to plan review <br /> coxn:ments fro�t�e City of Redwood City xegardzng t3�e Vesting Ten�ative Subdivision Map. <br /> Citv Cvmment 1 <br /> Proposed onWsite draFnage: <br /> a. Sta.f�lugbly reco�mends that the c�rainage ar�d aetention system sho�d be relocated ta <br /> the front of the homes to minimize zznpact to creek ba�nk. This wili also rr�znixn.ize faiiures <br /> af t�.e system due ta maintena�ce o�the detenti�n systex�a. <br /> b. Tf tke appZicazzt waz�:ts to �Ceep drainage and detention systezx� in the curren� propased <br /> locatxon, the applicant zr�ust demonstrate that there vaill be no impacts to tha czeek <br /> tl�'oug�furt�er analysis{geatechnical report addressing system installatian}. <br /> Earth Svsterns Pacific Response—Tb.e Vesting Tentatave Subdivision Map prepared by MacLeod <br /> and Assaciat�s x�.dieates that lot drainage will be directed to the rear of the lot whez-e it will be <br /> �icked up by a sez�es of field inlets. These inlets are connected by a d�tent�on pipe which <br /> discharges into the existin; �cz'eel� chann.el near the right rear carner of �,ot 5. �t is our <br /> unders�anding that the detez�t�on pipe and the associated catch baszns will be a c�osed pipe system <br /> intencled to temporarily store storm water runoff unti] it cata be released to the creek chanr��I. It <br /> is not designed to �romate infiltration af t3ze collected nuioff into tlne graund. Water �weig�s <br /> appxoximately ha�f the weigbt of soil and ther�foxe fihe detenlion system fall of water will weigh� <br /> less than th� soil it replaces, placing no surcharge Zaad an the ckxannel lining. In additiQn, the <br />