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._.. ---....____._.._..____-------- =----:,,. _:....�_. ....�.._,.... _:�__ ...�.1�.......�:...._�..�.W._._..,��..� <br /> Page 65 <br /> Q�. g� . . . . . . . . . <br /> ; . ,Z'44, :'.y$ � � t � . � �. � � � <br /> �,� . o I��ALrIH DE�'AI�TNIEN'1 <br /> '. ��anao.M� � . - � � . . . . ' . ' . . ' <br /> April 2,2007 APN: 459-240-920 <br /> ' Former SMCo#330139 <br /> Randy Lamb <br /> Nicholson Laznb Ventuxe, L.P. <br /> I680 Dcll Avenue _ <br /> Campbell,CA 95008 <br /> ' SUB3ECT: PROPOSED DEVELOPMENT AT 2l. HQRGAN AVENl7E AN➢ 885 <br /> WOODSIDE ROAD,REDWOOD CITY,GALIFORNIA ' <br /> Dear Mr. Lamb: <br /> _ . .. <br /> _ . <br /> Tliank yoii for tihe,Marc� 2, 2007, Human I-�ealth°Risk Assessmerit report �repared'by Geomega , <br /> ar�d the March 22;24Q7, soil and groundwater waste management plan prepared by Remediation <br /> Testing and Design (RTD). The following cornments-are based on San Mateo County <br /> Groundwater Protection Program (GPP}staff review of these documents and the project f le. <br /> Human Health Risk Assessment <br /> Paragraph Two on Pa�e Five of the report states an active groundwater eemediation systen� is <br /> operating at the acijacent. property upgradient of the subject site.. This. is incorrect. No <br /> groundwater remediation system has been installed at 89� W�odside Road. <br /> Paragraph Three on Page Eight of the report compares the laboratory results from the analysis of <br /> soil samples collected from 15 feet below�rade(fbg) to Ei�vironmental Screening Levels(ESLs) <br /> established by the Regioi�al Water QuaIityControl Board. This sa�npling depth rnay be within <br /> the capillary fringe ar upper partion of the saturated zone. 'I'herefore, comparing tlae laboratory <br /> results of these sampies to soil ESLs may nat be appropriate (i.e, soil ESLs assume the sarnple <br /> �vas collected from the unsaturated zane). <br /> , The Iast paragraph on Page Ten of the.re�iort states: "It'confining conditions are absent, depth to <br /> I groundwater eould be as shallow as 14 or 15 fcet". : Picasc note, it is possible to have both <br /> c��r.�:r.ir.g cc�:�d'ztiUr.s�nd a�epth�o �o�!���2ter af 14 tc� 15 �g. <br /> The assumptions and conclusions made by Geomega in preparing the risk assessment appea.r <br /> reasonabte. It does.not appear the hydracarh�n-affected groundwater beneath the subject site <br /> will pose an unacceptabi.e risk to eit}ier.construcfion workers or the future occupa�lts of the <br /> buiiding based on the proposed construction.details and the f ndings of the risk assessment: <br /> , <br /> � <br /> ��t��i�t,�c i�t,;�i;��ai�,����1�r��viat�;�i�ir�ftirr�i,�i�tt��t��c:riou n����s�oN ��� � <br /> Ru;n'd �af tinpt�i�itic�r�:hl;u k(:li;irc'h• I:uso Jarul>�t;ib���ii• hit'har;l S.(�n:41n�1•Jrrrti'I Illl •,4�I�'irnn�•'11.�i��r• Ilr:�llii!)ircrtt+r, (:titir•Irnr tiilrri <br /> 4.-�;>C����ntv t;i�tilrr•StviV�vvud('.ilv.(:1!1_;(!(i:i.vuu�r:li30.;S(i;.,V;?q:�•rui�(i34.:�7:�.;52(IG•v�t Si:�U.;iti3.73S(12 <br /> iUlp://ivww.;:n?h��iill�.urti <br />