SITE INFORMATION AND CORRESPONDENCE

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MONITORING AND REPOR4 PROGRAM NO.R5-2003-0802 ` -2- SOUTH 2-SOUTH SHORE PARCELS,L&M OPERABLE UNIT CONOCOPHILLIPS PETROLEUM COMPANY; CHEVRON,U.S.A.; TEXACO REFINING AND MARKETING,INC.;TOSCO CORPORATION; L&M PETROLEUM COMPANY,INC.;AND MR.BILLY MCKINNON STOCKTON, SAN JOAQUIN COUNTY GROUNDWATER MONITORING As shown on Figure 1, there are 17 monitoring wells associated with the three OUs. Three of the monitoring wells are either missing or damaged. Six of the 17 wells are associated with the area owned/operated by the Discharger. The groundwater monitoring program for these six 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. Sample collection and analysis shall follow standard EPA protocol. EPA Analytical Max.Detection Sampling Constituents Method Limit ' Frequency' (FtB�) Fre uenc Depth to Groundwater --- --- Quarterly Volatile Organic Compounds 8021B or 8260B 0.5 Quarterly Semivolatile Organic Compounds 8270 various' Quarterly Total Petroleum Hydrocarbons as Gasoline 8015M 50 Quarterly Total Petroleum Hydrocarbons as Diesel(Extractable) 8015M4 50 Quarterly Total Petroleum Hydrocarbons as Motor Oil(Extractable) 8015W 50 Quarterly Benzene 8020 or 8260B 0.5 Quarterly Toluene 8020 or 8260B 0.5 Quarterly Ethylbenzene 8020 or 8260B 0.5 Quarterly Xylene 8020 or 8260B 0.5 Quarterly MTBE6 Dissolved Metals 6000/7000 various' Quarterly 8260B 0.5 Quarterly TBA6 8260B 5 Quarterly 6 8260B 0.5 Quarterly D�E6 8260B 0.5 Quarterly 6 8260B 0.5 Quarterly Ethanol 8260B 50 Quarterly Methanol6 8260B 100 Quarterly For nondetectable results. Groundwater level measurements for all South Shore Parcel monitoring wells shall be collected within an eight- hour period. Groundwater sampling activities for all wells requiring sampling shall be collected within five days. If the OUs are collecting water levels and performing sampling separately,the activities must be coordinated to meet these requirements. ' Maximum detection limits must meet or be lower than the applicable water quality objective,unless this is not achievable by an EPA or State approved laboratory method. See Table 2 for a list of applicable water quality objectives. ° Without silica gel cleanup. 5 Dissolved metals to be analyzed include antimony,arsenic,beryllium, cadmi um,chromium,copper,mercury, nickel,lead, selenium,silver,thallium,and zinc. 6 Fuel oxygenates,including methyl tertiary butyl ether(MTBE),methanol,ethanol,tertiary butyl alcohol(TBA), tertiary amyl methyl ether(TAME),di-isopropyl ether(DIPE),and ethyl tertiary butyl ether(ETBE),shall be analyzed in all monitoring wells during first and third quarter monitoring events. If results are nondetectable for fuel oxygenates in all wells during both monitoring events,no finther monitoring for oxygenates is required. If a fuel oxygenate is detected in either monitoring event,it shall be added to the quarterly monitoring program for the well in which it was detected.