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k4! <br /> Advanced <br /> GeoEnviron mental, Inc . <br /> 28 September 2005 <br /> AGE-NC Project No. 97-0290 <br /> Ms. Lori Duncan <br /> San Joaquin County-Environmental Health Department <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 <br /> Subject: Soil Vapor Extraction and In-Situ Air-Sparging <br /> Confirmation Soil Sampling Work Plan <br /> Lodi Theater Project-107 North School Street, Lodi, California <br /> Dear Ms. Duncan: <br /> As part of the progression of the Advanced GeoEnvironmental,Inc.(AGE)implemented soil vapor <br /> extraction and air-sparging program at the site, a general reduction in concentrations of volatile <br /> hydrocarbons has been achieved.Background information and previous site investigation activities, <br /> along with distribution of petroleum- impacted soil and ground water were described in the <br /> Corrective Action Plan, dated 10 June 1999,prepared by AGE., <br /> As proposed in the Remedial Action Work Plan dated 31 January 2000,after efficiency of the SVE <br /> unit has declined, soil samples will be collected from the"core"petroleum hydrocarbon impacted <br /> area at the site.Analytical results of the soil samples will serve to approximate remaining petroleum <br /> hydrocarbon levels and determine if continuing remedial operation is necessary. Samples will be <br /> collected utilizing a direct push technology.Probe borings will be advanced using a Geoprobe 5400 <br /> soil probing unit.AGE proposes to advance soil probe borings in the"core"petroleum hydrocarbon <br /> impacted area at the site to depths of approximately 55 feet bsg. One boring should be located <br /> southeast of the location of SW 1 and one additional soil boring should be located east of SW2. <br /> Discrete soil samples will be collected at five-foot intervals beginning at a depth of 15 feet bsg <br /> utilizing a Geoprobe soil sampling assembly loaded with pre-cleaned 1.125-inch by 6-inch brass <br /> sleeves.Soil samples will be preserved by covering both ends of the second brass sleeve with Teflon <br /> sheets,plastic end caps and sealed with tape.Each sample sleeve will be labeled with the following <br /> information: soil probe boring location,depth, date and time. Soil samples will be transported in a <br /> cooler under ice to a DHS-certified laboratory for analysis of TPH-g,TPH-d,BTEX and MTBE in <br /> accordance with EPA methods 8015m and 8260. <br /> 837 Shaw Road, Stockton,C'al:ifornaa 9521.5 <br /> 'l�eleph one(209)467-100E Fax(209)467-1118 <br />