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<br />€> Earth Tech <br /> <br />A Tyco International Ltd. Company <br /> <br />Mr. Brian Lee, PE <br />November 21,2005 <br />Page 3 of 13 <br /> <br />. Boring B-07. Evaluate the vertical extent of benzene and MTBE in soil at the former <br />product pump location (at a minimum 1 soil sample will be collected); evaluate the lateral <br />extent of hydrocarbons and MTBE in groundwater relative to the former UST and the <br />possible presence of hydrocarbons and MTBE in groundwater related to the former <br />product pump area (1 groundwater grab sample). <br /> <br />. Boring B-08. Evaluate the lateral extent of gasoline range hydrocarbons and MTBE in <br />groundwater east of the former dispenser (1 groundwater grab sample). <br /> <br />. Boring B-09. Evaluate the possible presence of hydrocarbons and MTBE in groundwater <br />southwest and upgradient from the former UST location (1 groundwater grab sample). <br /> <br />1036 Middlefield Road <br /> <br />Three soil borings are proposed near the former UST at this location (see Attachment 1, Figure <br />5 of Work Plan). These borings are intended to facilitate sample collection for the following <br />evaluation purposes: <br /> <br />. Boring B-10. Evaluate the lateral extent of hydrocarbons in soil near the former 1,000 <br />gallon UST location (at a minimum 1 soil sample will be collected); evaluate the possible <br />presence and lateral! downgradient extent of hydrocarbons in groundwater near the <br />former 1,000 gallon UST location (1 groundwater grab sample). <br /> <br />. Boring B-11. Evaluate the lateral extent of hydrocarbons in soil possibly related to the <br />former 1,000 gallon UST (at a minimum 1 soil sample will be collected); evaluate the <br />possible presence and lateral! downgradient extent of hydrocarbons in groundwater near <br />the former 1,000 gallon UST location (1 groundwater grab sample). <br /> <br />. Boring B-12. Evaluate the possible presence of hydrocarbons in soil near the former day <br />tank location (at a minimum 2 soil sample will be collected); evaluate the possible <br />presence of hydrocarbons in groundwater near the former day tank location (1 <br />groundwater grab sample). <br /> <br />Investigation derived waste (lOW) including soil cuttings and decontamination water will be <br />contained in US Department of Transportation (DOT) approved 55-gallon drums or DOT <br />approved containers. The lOW containers will be staged in a secure location as designated by <br />the City pending disposal in accordance with applicable state and federal regulations. For cost <br />purposes the lOW is assumed to be classified as non-hazardous. <br /> <br />Following drilling and sampling, the boring locations will be surveyed by a licensed surveyor as <br />required by the State of California GeoTracker database. Ground surface elevations will be <br />referenced to the North America Vertical Datum (NA Vo-aa). <br /> <br />Chemical Analysis <br /> <br />Soil and groundwater grab samples will be submitted to a laboratory certified by the State of <br />California under chain-of-custody procedures for chemical analysis. The samples will be <br />analyzed on a standard (10 working days) turnaround time according to the schedule shown in <br />Attachment 2, Tables 5, 6, and 7 of the Work Plan. <br /> <br />The soil and groundwater grab samples will be tested according to the following chemical <br />