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hQuarterly Report - February 1999 WELDON CHURCH PROPERTY 104 West Beverly Place Tracy, California ' IA.. INTRODUCTION At the request-of Mr;Weldon Church,Advanced GeoEnvironmental,'Inc. (AGE) has'prepared ithis . Quarterly Report for the site at 104 West Beverly Place, Tracy, California (the site). The scope of _ work included monitoring and sampling seven wells, obtaining laboratory analyses of the samples : and preparation of this report. The site setting is illustrated'on Figure I =Location Map. Locations ' of structures,borings and monitoring wells related to.the site are illustrated on Figure 2 - Site Plan. Site history and findings from previous investigations and previous monitoring events'at the site are r detailed-in the Preliminary lnvestigatian.and,Evaluation Report—September 1996 (PIER) prepared by AGE... _ 2.0. ' PROCEDURES The work was erformed in accordance with.San Joa uin Coun Public Health Services - p q ty Environmental Health Division (PHS-EHD} and Central Valley Regional Water Quality Control Board guidelines for investigation of underground storage tank (UST) sites. 2.1: MONITORING WELL PURGE PROCEDURES 'On 24 February 1999, a Solinst water level meter was used to measure the depth to ground water in each well relative to the tops of the well casings. 'After ground water depth measureiiients'were collected, each monitoring well was purged using a two-stage-subinersible pump. Approximately 4 . to 8 gallons of water were. evacuated from each monitoring well (a minimum three,well casing volumes), as appropriate for each well. Temperature,pH and conductivity were measured at 2-gall6n"intervals using an•ICM model 52200 water analyzer-to monitor stabilization of these ground water parameters. Field data logs are included in Appendix A. Purged water'was.temporarily stored on-site in 55-gallon drums. 2.2. ' : COLLECTION AND ANALYSIS OF GROUND.-WATER SAMPLES Water - after allowing . r samples were collected from each monitoring well using new disposable bailers a g at the wells to achieve a minimum'80%recovery of the pre-purge`water volume:The samples were transferred into 40-m1 EPA-approved vials containing 0.5• ml "of 18% hydrochloric acid as, a preservative. The sample vials were then labeled-with the monitoring well designa#ion, date, time of sampling and.the sampler's initials. The samples were'transported in a chilled container under „ Advanced GeoEnvironmental,Inc.