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9A <br /> Page 69 <br /> RFMEDTAT[ON TES'TtNG ANi1 DESIG� 88� Woodside Ruad,Redwood City,CA <br /> Project No.2K564 Summary of GNP Staff Response Letter <br /> GPP stafr states that �?e Risk Assessnzent assnmptions and conclusic�ns a;��ear. reasonable. In <br /> addition, GPP staff inclependently coz�cludes that the groundwater pluine beneath the proposed <br /> condorninium site does not appear to pase an unacceptable risk to construction worlcers or future <br /> �ccupants. <br /> Waste Mana�ement Plan <br /> GPP staff approved the �✓asie ?vlanagement Plan with several conditions2 which are considered <br /> to be sTandard, includina: 1) sc.hedul?ng of deep excavatio?1 ��d dri?Ling with CrpP staff; 2) vapor <br /> znonitorir.g along the eastern properiy boundary; 3) rtiiniznization of dust arid sampie spoiis <br /> according to landfill requirements; 4) notification of GPP staff if IZydrocarbons a�•e identified; <br /> ' �) no over-waterinb of soil stockpiles; and, 6) bacicfilli3�g of soldier i�eam borings with Portland <br /> cemeilt grout. <br /> Condition�#2 concerning vapor. monitoring of the eastern property bo�zndary is precautionary due <br /> to the adjaceilt residential nei�hborhaod. Yreviously detected soil and brovnc�water impacts at <br /> fhis site are tow and not expected to create vapors exceeding the l 00 parts per million standard <br /> established by the Gl'P staff. It is impor.tant to note that eve�yday activities within the local area <br /> ' cre�te more significult cxposure to gasotine vapors from heavy autornobile traffic on Woodside <br /> ! Road,the normai operations and spillage at the severa] neighborhood gasoli��e filling stations and <br /> the cars present in the neighborhoods than what is possible fron�the proposed site excavation. <br /> Condition #5 regarding backfilin�g of the soldier beam borings with Portland cer��ent grout is a <br /> standard requirement. The soldier beams will be instalied in grout and, when no lon�;er needed, <br /> wiil be cut off below gradc. This is standard industry practice to protect groundw�ter at all sites <br /> given the potential for contan�inant migraiion through soldier beams, inctuding urban runoff and <br /> sewer leakage. <br /> Closin�Coz�iznents <br /> Gl'P staff has outiined a Qossible approach for Nicholson Lamb Venture to co��sider coordination <br /> with the Gas& 5hop consultant to install piping beneath the proposed basement sla� to ailow for <br /> potential fiiture conveyance of vapor and/or g�•oundwater io the Gas& Shop site3, This approach <br /> is not irtcluderi in the $$� w`oodside Road Project, nor is it a con�iition ior ap}�roval of the <br /> project. The approach outlined in the leiter is simply a suggestion for coordination to assist ir� <br /> the cleanup of the Uas & Shop site should that property owner undertake such efforts in the <br /> fuhire. At this time,there is no approved clea�iup plan for the Gas&Shop sit.c. Tt i.s possible that <br /> no further active cleanup will be required becanse tt�e plume continues to shrink due to nattiral <br /> biodeg:adation. <br /> z San Mateo Counry Neath l�epaitment(20U7)Propvsed De.velvpmei�t at 21 Horgan�fvenue and 88� Wo�dside <br /> Rou� Red�vood City, Califor•lzicr,Letter to Randy Lamb,Aprii 2,2007 <br /> 3[bid <br /> -2- <br /> � <br /> i <br />