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Quarterly Report - May 1999 NEWFIELD PROPERTY 107 North School Street, Lodi, California I1.0. INTRODUCTION At the request of Mr Edward Barkett and Mr Joseph Newfield,Advanced GeoEnvironmental, Inc (AGE)has prepared this Quarterly Report for the property located at 107 North School Street, Lodi, California IOne tnple-completed vapor well, two air sparging wells with vapor monitoring points and one ground water monitoring well were installed at the site in April 1999 Ground water monitoring was performed on 30 April 1999 An in-situ air sparging(IAS)and soil vapor extraction(SVE)pilot test were performed in May 1999 The SVE/IAS pilot test was be described in the Corrective Action Plan, dated 10 June 1999, prepared for the site by AGE Well installation and ground water I monitoring are described below Background information and previous site investigation activities were described in the Preliminary Site Assessment Report, dated 16 February 1999, prepared by AGE The site and the surrounding area are illustrated in Figure 1- Location Map Structures, well Iand boring locations are illustrated on Figure 2 - Site Plan w 2.0. PROCEDURES All field work was performed in accordance with San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) and Central Valley Regional Water Quality Control Board (CVRWQCB) guidelines for investigations of underground storage tank (UST) sites Field I procedures for the collection of soil samples,completion and development of wells and performance of ground water monitoring and sampling are described below 21 DRILLING AND SAMPLING ' From 19 to 21 April 1999, four soil borings were advanced at the site All borings were advanced to a depth of 60 feet bsg using a B-53 drill rig Boring VW1 was advanced using 10-inch diameter hollow-stem augers,bonngs SWI, SW2 and MW8 were advanced using 8 25-inch diameter hollow- stem augers The drill rig and three-man crew were supplied by Central Valley Drilling (CVD) of Rancho Cordova, California Auger returns generated by drilling were placed in 55-gallon DOT- approved drums, labeled and stored on-site pending laboratory analysis Boring locations are shown on Figure 2 ' Soil samples were collected ahead of the drill bit using a split-tube sampler loaded with three pre- cleaned 2-inch by 6-inch brass sleeves The samples were collected at five-foot intervals, beginning . at a depth of 5 feet below surface grade (bsg) in borings VW 1, SWI and SW2 and beginning at a ' Advanced GeoEm ironmentai,Inc