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Quarterly Report - May 1999 FORMER CHASE CHEVROLET (VAN BUREN) FACILITY ' 424 North Van Buren Street, Stockton, California INTRODUCTION At the request of Mr Jeffery Setness of Jeff B Setness Professional Law Corp , Advanced ' GeoEnvironmental, Inc (AGE) has prepared this quarterly report summarizing field activities performed during the second quarter of 1999 at 424 North Van Buren Street, Stockton, California ' (Figure 1 -Location Map) The scope of work Included installation of 13 horizontal vapor recovery wells,five conventional vapor extraction wells, 23 in-situ air sparging wells, collection of soil and ground water samples, quarterly ground water monitoring, obtaining laboratory analyses of the ' samples and preparation of this report Structures and monitoring well locations on the site and adjacent area are illustrated in Figure 2 - Vicinity Map and Figure 3 - Remediation System Background information was summarized in the Corrective Action Plan - December 1996 prepared ' by AGE ' 2.0. PROCEDURES Field activities were performed in accordance with guidelines established by the Regional Water Quality Control Board - Central Valley Region (RWQCB-CVR) and by the San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) for the investigation of ' underground storage tank (UST) sites Field procedures for the collection of soil samples, completion and development of wells and performance of ground water monitoring and sampling are described below I 21 HORIZONTAL WELL INSTALLATION ' Between 05 to 21 April 1999, eleven horizontal vapor recovery wells were installed at the site A backhoe was used to dig trenches approximately 12 to 13 feet deep using an 18-inch or 24-inch ' bucket The backhoe and operator were supplied by Stokley Construction of Tracy Trenches varied in length from approximately 35 to 75 feet Hydrocarbon odor or soil discoloration were not observed during trenching I Approximately 3 Inches of 43 Lonestar sand was placed in the bottom of the trench Two-Inch diameter schedule 80 PVC casing with 0 020-inch slotted screen was placed in the length of the trench with blank casing extending vertically to the surface at one end Additional sand was then placed in the trench to cover the PVC casing Approximately one foot of native soil was placed on top of the filter pack A minimum of six inches of concrete was then placed in the trench and allowed to solidify The trenches were then backfilled to surface grade with native soil Horizontal well locations are Illustrated on Figure 3 Horizontal well construction is illustrated in Figure 4 I Advanced GeoEnilronmental,Inc