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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION REVISED MONITORING AND REPORTING PROGRAM NO. 93-701 FOR GEWEKE LAND DEVELOPMENT AND MARKETING 16 SOUTH CHEROKEE LANE,LODI SAN JOAQUIN COUNTY The site was formerly operated as a gasoline service station with underground storage tanks, and is currently a retail sales car lot. The property is owned and operated by Geweke Land Development and Marketing (Geweke), a general partnership. Cleanup and Abatement (C&A) Order No. 90-702, issued on 5 March 1990, ordered Geweke to investigate and remediate soil and groundwater contamination at their site and submit required reports. C&A Order No. 90-702 was rescinded on 15 March 1993, and C&A Order No. 93-701 was issued. C&A Order No. 93-701 ordered Geweke to complete site investigation, submit a final remediation plan, and initiate soil and groundwater remediation. C&A Order No. 93-701 included Monitoring and Reporting Program No. 93-701. This Monitoring and Reporting Program (MRP)is issued pursuant to Section 13267 of the California Water Code and is designed to delineate groundwater contaminant plumes and determine whether remediation efforts are effective. The Discharger shall not implement any changes to this MRP unless and until a revised MRP is issued by the Executive Officer. This MRP replaces the requirements listed in MRP No. 93-701,which was issued on 15 March 1993. Prior to construction of any new groundwater monitoring or extraction wells, the Discharger shall submit plans and specifications to the Board for review and approval. Once installed, all new wells shall be added to the monitoring program and shall be sampled and analyzed according to the schedule below. GROUNDWATER MONITORING As shown on attached Figure 1 from Advanced GeoEnvironmental's 25 April 2001 First Quarter Groundwater Monitoring Report, there are currently 14 monitoring wells (MW-1 through MW-14), and one extraction well(EW-1) installed both on-site and off-site. The groundwater monitoring program for all 15 wells and any wells installed subsequent to the issuance of this MRP, shall follow the schedule below. Monitoring wells with free phase petroleum product or visible sheen shall be monitored for product thickness and depth to water only. If a groundwater extraction system is initiated, the groundwater extraction operational data including total volume of extracted groundwater shall also be provided in quarterly monitoring reports. Sample collection and analysis shall follow standard EPA protocol.