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lmwll� <br /> Work Plan-Tosco (Former BP Oil)Station No. 11192,Stockton, California <br /> September 6,2000. <br /> PROPOSED SCOPE OF WORK <br /> The proposed scope of work includes: arranging for Tosco's contractor to collect 5,000 <br /> gallons of groundwater a week from well MW-3 and transporting the water to Tosco's <br /> refinery; collecting groundwater samples from monitoring well MW-3, submitting the <br /> samples to a state certified analytical laboratory for chemical analysis; collecting data during <br /> groundwater purging to estimate the influence of the purging on surrounding wells; and <br /> preparing a report presenting the observations associated with the groundwater purging and <br /> performance test. MW-3 will be purged and evaluated initially in the performance test. If <br /> MW-3 does not perform adequately, well MW-7 may be substituted for MW-3, or purged in <br /> conjunction with MW-3. <br /> Task 1 Groundwater Purging and Sampling <br /> Groundwater will be purged directly from the casing of well MW-3, into a 5,000 gallon <br /> vacuum truck and transported by Onyx Industrial Services, Inc. (Onyx) to the Tosco <br /> Refinery in Rodeo, California, for disposal. Groundwater samples will be collected from <br /> well MW-3 prior to initiating the purging program and periodically thereafter. The results <br /> of these samples, in conjunction with the results of the quarterly groundwater monitoring <br /> and sampling of the six monitoring wells, will be used to evaluate the effectiveness of the <br /> groundwater purging. Based on this evaluation, recommendations for modification of this <br /> proposed scope of work, including further performance testing and/or the purging of <br /> additional wells, will be made as warranted. <br /> Task 2 Groundwater Sampling and Analysis <br /> GR proposes to collect groundwater samples from well MW-3 and submit the samples to <br /> Sequoia Analytical (Sequoia), in Walnut Creek, California (ELAP 91271), under chain-of- <br /> custody documentation. Groundwater sampling outside of the normal quarterly monitoring <br /> and sampling events will be conducted in accordance with GR Field Methods and <br /> Procedures (attached). <br /> The analytical program will include analyses for total petroleum hydrocarbons as gasoline <br /> (TPHg) by EPA Method 8015 modified, and benzene, toluene, ethylbenzene, total xylenes <br /> (BTEX) and MTBE by EPA Method 8020. The analytical results of the groundwater <br /> samples will be used evaluate the effectiveness of the purging program. Analytical results <br /> will be documented in status reports to be submitted to Tosco and the San Joaquin County <br /> Environmental Health Division. <br /> 140245.02 <br /> 2 <br />