ARCHIVED REPORTS XR0006448 - Laserfiche WebLink

Home Browse Search

Ground Water Monitoring Report Second Quarter 2000 PAIGE'S TOWING ' 1807 Douglas Road, Stockton, California 1.0. INTRODUCTION AND SCOPE OF WORK Advanced GeoEnvironmental, Inc. (AGE)has prepared this quarterly report for 1807 Douglas Road, Stockton, California. The site setting is illustrated on Figure 1. Site structures and monitoring well locations are depicted on Figure 2. A summary of previous investigations at the site was included in Preliminary Site Investigation and Evaluation Report, dated 20 February 1996 and prepared by AGE. Ground water monitoring procedures for the site were outlined in Work Plan Addendum - September 1998, dated 16 September 1998 and in Revision to Work Plan Addendum - September 1998, dated 16 March 1999 and approved by the PHS-EHD by letter on 29 March 1999. ' 2.0. PROCEDURES The objective of the work was to monitor dissolved petroleum hydrocarbon concentrations in ground water and to characterize ground water flow direction and gradient on the site. Field work and report preparation are in accordance with guidelines established by the San Joaquin County Public Health Services - Environmental Health Division(PHS-EHD) and by the Central Valley Regional Water Quality Control Board (CVRWQCB) for investigation of underground storage tank (UST) sites. 2.1. MONITORING WELL PURGE PROCEDURES On 26 June 2000, ground water monitoring and sampling was performed on wells MW-1, MW-2, MW-3,and MW-4. Prior to sampling,the depth to ground water was measured from the top of each well casing to the nearest 0.01 foot utilizing a Solinst water level meter. Ground water elevations in each well at the site were calculated by subtracting the measured depth to ground water from surveyed casing elevations (Table 1). After water levels were measured, approximately six to eight gallons of ground water (a minimum ' of three well-volumes per well) were removed from each well utilizing a two-stage submersible pump. The ground water was initially pumped near the top of the water column and then the pump was slowly lowered to total depth to purge ground water within the entire well casing. Temperature, pH and conductivity were measured for stabilization at regular purge-volume intervals from each well using a Hydac water analyzer. Field data and logs are in Appendix A. Purged ground water was containerized in 55-gallon drums and was stored on-site in an area lacking general public access. 2.2. GROUND WATER SAMPLING • Water samples were collected from each purged well using new disposable plastic bailers after the Advanced GeoEnviranmental,Inc.