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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION MONITORING AND REPORTING PROGRAM NO. R5-2006-0804, CALIFORNIA WATER CODE SECTION 13267 FOR CHEVRON PIPELINE COMPANY CORRAL HOLLOW AND GRANTLINE ROADS SAN JOAQUIN COUNTY Chevron Pipeline Company"(Discharger) owns and operates a•ref ned petroleum products enear 'the neathe intersection of Corral-Hollow and Grant Line Road in Tracy. Groundwater,ata depth of 10 feet, is polluted with total petroleum hydrocarbons as diesel and gasoline (TPHd and -- hydrocarbons(PNAs). This pollution impaired the beneficial uses of this water resource. In 1987 the Discharger excavated about.100 cubic yards of soil containing'petroleum hydrocarbons, and in 1997 operated a dual-phase groundwater and soil vapor extraction system. Since 1997. the Discharger has monitored the site to verify that the remaining hydrocarbons are naturally degrading. This Monitoring and Reporting Program (MRP) is issued pursuant to Section 13267 of the California Water Code and iss necessary to verify natural biodegradation of the petroleum hydrocarbons. Existing data and information about the site show the presence of various chemicals, including TPHd,'TPHg, benzene and naphthalene emanating from the property resulting from the Discharger's current or past operation. .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.,96=814, which was issued"o& 24 September 1996. Prior to construction of any new.groundwater monitoring or extraction wells, and prior to destruction of any groundwater monitoring or extraction wells,the Discharger shall submit plans and specifications to the Regional Board for review and approval. Once installed`all new wells 'shall be added to the rrioriitoriif program afid-sliall'beaarrmpled and analyzed according to the schedule below. GROUNDWATER MONITORING " As shown on Figure 1, there are five monitoring wells remaining,at-the site, designated MW-5, MW-6, MW-7, MW-8 and.MW-12. The groundwater monitoring program-for MW-6, MW-8, MW-12 and any wells installed;subsequent to the issuance of this MRP, shall follow the schedule below. If sampling requirements for elimination of constituents-have been met under the previous MRP,the Discharger-is not required to sample for those constituents again based on the new requirements. Monitoring wells with free phase petroleum product,or visible sheen shall be monitored, at a minimum, for product thickness and depth to water. Sample collection and analysis shall follow standard EPA protocol. t