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Quarterly Report - Second Quarter 2001 LODI AIRPORT ' 23987 North Highway 99, Acampo, California ' 1.0. INTRODUCTION In accordance with the request of Mr Robert Kupka of Lodi Airport,Advanced GeoEnvironmental, ' Inc (AGE) has prepared this quarterly report for the property located at 23987 North Highway 99, Acampo, California (site) The scope of work included quarterly ground water monitoring and preparation of this report The location of the site and the immediately surrounding area are ' illustrated on Figure 1, structures, former UST locations, and soil boring and monitoring well locations are Illustrated on Figure 2 Background information is summarized in Preliminary Site Assessment Work Plan,dated 23 February 2000,and in Underground Storage TankRemoval Report, ' dated 11 January 2000, both prepared by AGE 2.0. PROCEDURES Field work was performed in accordance with guidelines established by the California Regional Water Quality Control Board- Central Valley Region for investigation of underground storage tank (UST)sites Ground water monitoring procedures were performed as outlined in the AGE-prepared Preliminary Site Assessment Work Plan, and approved by the PHS-EHD by letter dated 23 February 2000 2 1 MONITORING WELL PURGE PROCEDURES On 17, May 2001, a Solinst water level meter was used to measure the depth to ground water in all three monitoring wells relative to the tops of the well casings After the depth-to-ground water measurements were collected, the monitoring wells were purged using polyvinyl chloride (PVC) ' bailers Approximately 7 gallons of water were evacuated from each of the monitoring wells, equivalent to three casing-water volumes per well Temperature, pH and conductivity were measured at 1-gallon intervals, using an Oakton water analyzer to monitor pH, temperature and conductivity of the purged water The field data are summarized in tables in Appendix A, along with the field data logs Purged water>was temporarily stored on-site in 55-gallon drums 22 COLLECTION AND ANALYSIS OF GROUND WATER SAMPLES Water samples were collected from each monitoring well using new disposable bailers after allowing the wells to achieve a minimum 80% recovery of the pre-purge water volume The samples were transferred into laboratory-supplied 40-m1 EPA-approved VOA vials containing 0 5 ml 18% hydrochloric acid as a sample preservative The sample vials were then labeled with the monitoring well designation,date,time of sampling and the sampler's initials The samples were transported in Advanced GeoEnvironmental,Inc I _