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<br />Søbsur(atJe Eonsultuu, Inv. <br /> <br />Mr. Miobael Cady <br />Redwood City Redevelopment Agency <br />FebNary 23. 1998 <br />Revised February 25, 1998 <br />PW 98.040 <br />Page 3 <br /> <br />Task 2 . Phase n EnvironlØeDtal Assessment <br /> <br />To further evaluate the presence or ab8e1)Ce of hazardous mB1erlals impacts. at the site, SCI will <br />also collect and chemically analyze soil and groundwater samples from three borings onsite. The <br />boring locations will be se1eçted upon completion of Task 1. SCI will obtain a driDing permit <br />from the San Mateo County Department of Health Services prior to field activities. In addition, <br />we will retain a private utility-locating company to check for subsurface utilities in the vicinity of <br />our boring locations. . <br /> <br />SCI will utilize portable, direct-push, narrow-diameter soil and groundwater sampling equipment <br />that mi11imi.zes the generation of inveStigation-derived soil and water wastes. Soil samples wiU <br />be obtained at approximately 3- to S-fQOt sampling interVals from the borings. Upon completion <br />of soil sampling, using a bailer, we will obtain grab groundwater samples from temporary slotted <br />PVC casing placed in the boring. Soil and groundwater sampling equipment wiU be cleaned <br />between sampling inrerva1s and borings. We anticipate that depth to groundwater will be <br />approximately 10 to 15 :feet below ground swface. We have therefore assumed that the total <br />depth of our borings will not exceed. IS to 20 feet. After collecting groundwater sampJes, the <br />borings will be filled with cement grout. . <br /> <br />Samples will be retained in clean labeled containers, stored in a cooled ice-chest, and delivered to <br />a state.certified chemical testing laboratory. For budgeting purposes, we have aasumed that soil <br />and groundwater sample¡ wilJ be analyzed for the following: <br /> <br />. Total volatile hydrocarbonB (TVH) as gasoline. and benzene, toluene, ethylbenzene, and <br />xylene! (BTEX). BPA Test Method 801518020 (six soil and three groundwater samples), <br />. Methyl tertiary butyl ether (MTBB). BFA Test Method 8020 (three groundwater samples), <br />. Total extractable hydrocarbons (TEfl) as diesel and motor oil, BfA Test Method SOlS (six <br />soil and tI1œe groundwater samples), <br />. 17 Title 22 metals, BPA Test Method 6O1onOOO series (three soil samples), and <br />. Halogenated vola.tíle organic compounds (HVOCs), EPA Test Method 8010 (ttn"ee <br />groundwater samples). <br /> <br />On the basis of the results of Task 1, we may reconunend that the testing program be modified. <br />We will discuss any reco:rnmended modifications with the City prior to submitting samples for <br />chemical analysis. For budgeting pwposes, we have assumed that samples will be analyzed on a <br />rusb turnaround basis of 48 hours. <br /> <br />21/Þ' . d <br /> <br />IJS0¿6¿66201S WdS2:10 86. S2 83~ <br /> <br />,-..-....--. .,... <br />i <br />