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iMonitoring Well installation Report - Former Chevron ServlLe station #9-5775 June 2 1999 located just outside the ih-mile radius of the subject site The search results are summarized in Table 1 and well locations are shown on Figure 3 The monitoring wells (1 and 5 on Figure 3) are located approximately 500 feet west of the subject site and belong to Arco Products Company City of Lodi municipal well #6R (2 on Figure 3) is located approximately 0 6 miles northeast of the subject site City of Lodi municipal well #18 (3 on Figure 3) and one domestic well (4 on Figure 3) are located approximately 0 6 miles south of the subject site The CDWR file did not contain information regarding the City of Lodi municipal well located in the southwestern vicinity of the subject site The City of Lodi Water Division (CLWD) was contacted to obtain information regarding the municipal well located in the southwestern vicinity of the subject site Based on the information provided by the CLWD municipal well #12 is located at 1412 South Hutchins Street, approximately 600 feet southwest of the subject site (6 on Figure 3)' This well was installed in 1962 The well is 510 feet deep with a screen extending from 210 to 500 feet bgs and a grout annular seal at the depth of 108 feet bgs First groundwater was encountered to the well at 55 feet bgs Annual well production has ranged from 24 4 to 165 million gallons Between 1987 to 1992 the well was not used Groundwater samples collected from the well in 1996, 1998, and first quarter 1999 did not contain MtBE The well data is included in Appendix B A review of the USGS topographic map (Lodi South Quadrangle, California -San Joaquin Co , 7 5 Minute Series, 1968, Photorevised 1976) indicated the presence of three wells approximately tfz-mile southeast of • the subject site and one well approximately 900 feet southwest of the subject site The CDWR file did not contain information regarding these wells C7 4.0 FIELDWORK Field work was conducted in accordance with GR's Field Methods and Procedures (Appendix C) and the Site Safety Pian dated January 21, 1999 A well installation and soil boi ing permit (#018004) was obtained from the SJCPHS, an underground utility locator was contracted to clear boring locations, and Underground Service Alert was notified prior to drilling at the site A copy of the permit and copies of the State of California Well Completion Reports are included in Appendix D 4.1 Dril1ing Activities On January 25 through 27, 1999, a GR geologist observed V&W Drilling, Inc (C57 #720904) drill five on-site soil borings (SB -1 and MWA through MW4) and install groundwater monitoring wells in borings MW -1 through MW -4 at the locations shown on Figure 2 Soil boring SB -1 was drilled to 72 5 feet bgs and well borings MW -1 through MW4 were drilled to 65 feet bgs using 8 -inch hollow -stem augers driven by a truck -mounted drill rig Soil boring SB -1 was not drilled through the existing conductor casing as specified in the Work Plan, because the casing was not perfectly vertical Soil boring SB -1 was drilled approximately two feet north of the conductor casing Soil samples were collected from borings SB -land MW -1 through MW -3 continuously and from boring MW -4 approximately every 5 feet The GR geologist prepared logs of each boring and screened the soil samples in the field for the presence of volatile organic compounds Screening data are presented on the boring logs (Appendix D) 34640804-2