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- 1 i <br /> QUARTERLY REPORT <br /> June1996 <br /> ' Pacific Gas <br /> 2088 Mariposa Road, Stockton, California ` <br /> 1.0. INTRODUCTION <br /> In accordance with the request of Mr Manuel Sanchez, Advanced GeoEnvironmental,E Inc (AGE) <br /> has prepared this Quarterly Report for 2088 Mariposa Road, Stockton, California' The report <br /> ' summarizes field work activities performed at the site during June 1996 and presents the results <br /> of the laboratory analysis The location of the site is illustrated in Figure 1 -Location Map A plan <br /> of the site is illustrated in Figure 2 - Site Plan <br /> ' <br /> Background information and results of previous invests ation/monitorin activities were recently <br /> g F g g Y <br /> described in a quarterly report prepared by AGE, dated 17 April 1996 <br /> The monitoring and sampling was performed in accordance with the San Joaquin CountyPublic <br /> ' Health Services - Environmental Health Division (PHS-EHD) and the Regional Water Quality <br /> Control Board(RWQCB) guidelines for the investigation of underground storage tank(UST) sites <br /> 2 0. PROCEDURES <br /> ' 2 1 MONITORING WELL PURGE PROCEDURES _ <br /> 1 � <br /> On 12 June 1996, the depth to ground water in each monitoring well was measured to the nearest <br /> 0 01 foot utilizing a Solist water level meter Relative ground water elevations were calculated by <br /> subtracting the depth to ground water from the relative casing elevations surveyed from'a temporary <br /> benchmark (Table 1-Relative Ground Water Elevations) Relative ground water elevations were <br /> ' plotted and contoured on a scaled site map, whereupon a ground water gradient was approximated <br /> (Figure 3- Relative Ground Water Elevation Map) <br /> After ground water levels were measured, a minimum of three well volumes of ground water were <br /> purged from each well utilizing a disposable bailer Approximately 10 gallons of ground water was <br /> ' removed from wells MW-I through MW-3 <br /> Temperature,pH and conductivity were measured in regular intervals from each well using an ICM <br /> ' model 52200 water analyzer Stabilization data and field logs are enclosed as Appendix A Purged <br /> water was transferred into 55-gallon drums, which were subsequently stored on-site in an area <br /> inaccessible to the general public t <br /> 1 <br /> 1 <br /> 1 <br /> 1 <br /> I <br />