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GROUND WATER MONITORING REPORT JUNE 1998 _ Lodi Police Department 221 West Pine Street, Lodi, California _ 1.0. INTRODUCTION AND SCOPE OF WORK In accordance with the request of Mr. Dennis Callahan of the City of Lodi, Advanced GeoEnvironmental, Inc. (AGE)has prepared this report for ground water monitoring performed at 221 West Pine Street, Lodi, California. The site location is illustrated on Figure 1. Structure and monitoring well locations are illustrated on Figure 2 -Site Plan. An active 18,400-gallon gasoline underground storage tank(UST)is located on the subject property. Site background was summarized in the Soil and Ground Water Investigation report prepared by J.H. Kleinfelder. Field work was performed in accordance with Central Valley Regional Water Quality Control Board (CVRWQCB) and San Joaquin County Public Health Services - Environmental Health Division (PHS-EHD) guidelines for the investigation of UST sites. 2.0. PROCEDURES 2.1. MONITORING WELL PURGE PROCEDURES On 17 June 1998,a Solinst water level meter was used to measure the depth to ground water in MW- I and MW-2 relative to the top of the well casing. After measuring ground water depths, dedicated bailers were used to remove approximately 3 and 8 gallons of water from MW-1 and MW-2, respectively. Temperature,pH and conductivity of purged water were measured at regular intervals during purging using an ICM model 52200 water analyzer. Monitoring well stabilization data and field sheets are included in Appendix A. Purged water was stored on-site in a 55-gallon DOT drum pending laboratory analysis. 2.2. COLLECTION OF GROUND WATER SAMPLES Water samples were collected from each well using new disposable bailers. At the request of the PHS-EHD, a water sample was also collected from a domestic well located at the site. Each sample was transferred into three 40-m1 EPA-approved VOA vials containing 0.5 ml of 18% hydrochloric acid as a preservative. The samples were labeled,placed in a chilled container and transported to McCampbell Analytical, Inc. (MAI) in Pacheco. The samples were analyzed for: • Total petroleum hydrocarbons quantified as gasoline (TPH-g) in accordance with EPA Method 5030/8015m .. Advanced GeoEnvironmen[al,Inc.