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05/20/1999 13:16 2095385852 GEOLOGICAL TECHNICS PAGE 02/03 <br /> Geologicaf Technics Inc. <br /> 27417tivcr Road <br /> Mc&to,Cafornta 95351 <br /> (209)5M-642417a,*538-5552 <br /> Work Plan Addendum <br /> Soil & Groundwater Investigation <br /> Fonzia <br /> APN 233-460-07 <br /> 501. E. Acacia St, <br /> Tracy, California <br /> Project No. 774.2 <br /> May 20, 1999 <br /> 1.0 INTRODUCTION <br /> Several phone conversations and memos have been exchanged regarding the scope of work <br /> for this investigation. The goal of this investigation is to answer the remaining questions so <br /> the site can be evaluated for closure. Unless elevated concentrations of contaminants are <br /> discovered, further work is not warranted. <br /> 2.0 PROPOSED INVESTIGATION <br /> This work includes: <br /> 1. Drilling <br /> • Drill GP-14 in the former storage area. This borehole will be extended deeper to <br /> define the vertical extent of contamination_ The anticipated depth of this borehole is <br /> approximately 33 feet bgs. <br /> • Drill GP-15 immediately downgradient of the former storage area to a depth of 12 ft. <br /> • Drill GP-16 approximately 100 feet south of the former storage area, to a depth of 12 <br /> ft,to measure the background conditions of metals in the soil and groundwater. <br /> • Drill GP-17 NE of the warehouse, to a depth of 12 ft, to evaluate the condition of the <br /> soil and groundwater downgradient of GP-9. <br /> 2. Lab Testing <br /> • GP-14 <br /> • Soil @ 12 & 33 ft—TEPH-diesel & motor oil by 8015m, Semi-Volatile by 8270, <br /> & 5-metals by 6010 <br /> • Soil @Ja 19&26 ft—TEPH-diesel&motor oil by 8015m <br /> • Water @ 12 ft—TEPH-diesel & motor oil by 8015m (filtered w/ 8µm glass fiber <br /> filter & unfiltered prior to extraction), Semi-Volatile by 8270 (filtered w/ 8µm <br /> glass fiber filter prior to extraction), & 5-metals by 6010 (pre-filtered w/ 8µm <br /> filter, filter w/0.45 µm filter) <br /> • Water @ 19 ft — TEPH-diesel & motor oil by 8015m (filtered & unfiltered as <br /> above) <br />