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**—Work Plan for Additional Groundwater Investigtidtion <br /> Quik Stop Market No. 132 <br /> 3555 West Hammer Lane <br /> Stockton, California <br /> In a letter to Quik Stop Markets Inc., dated April 1, 1997, the San Joaquin County Public Health <br /> Services Environmental Health Division stated the that "the only remaining issue at the site is <br /> the MTBE currently being detected in Monitoring Well MW-5". The San Joaquin County <br /> Public Health Services Environmental Health Division recommended the sampling of only <br /> Monitoring Well MW-5 for future quarterly monitoring events, therefore, no other groundwater <br /> monitoring wells at the site were sampled during the first quarter 1998 sampling event. <br /> However, in a letter to Quik Stop Markets Inc. dated April 27, 1998, the San Joaquin County <br /> Public Services Environmental Division stated that "each quarter sample and analyze water from <br /> all of the MWs until further direction from the San Joaquin County Public Health Services <br /> Environmental Health Division". <br /> On March 1, 1999, ATC completed six soil borings to further assess the vertical and lateral <br /> downgradient extent of MTBE concentrations in soil and groundwater related to the site. Soil <br /> and groundwater samples were obtained at each location. The soil and groundwater samples <br /> were analyzed for TPH-G, BTEX, and fuel oxygenates including tert-butanol, MTBE, di- <br /> isopropyl ether(DIPE), ethyl-tert-butyl ether(ETBE) and tert-amyl methyl ether(TAME). TPH- <br /> G and BTEX were not detected in any of the soil samples. Tert-butanol was detected in soil <br /> samples obtained from ATC-5-18' and ATC-6. MTBE was detected in soil samples obtained <br /> from ATC-1, ATC-5-18', and ATC-6. TPH-G was detected in groundwater samples obtained <br /> from ATC-2, ATC-3, and ATC-6. BTEX (at least one constituent) was present in groundwater <br /> samples obtained from ATC-2, ATC-3, ATC-5-20', and ATC-6. Tert-butanol was detected in <br /> groundwater samples obtained from ATC-3, and ATC-5-20'. MTBE was detected in all <br /> groundwater samples, except for ATC-4. <br /> OBJECTIVE <br /> The objective of the proposed scope of work is to further determine the lateral extent of MTBE <br /> concentrations in groundwater downgradient of soil boring ATC-2. <br /> SCOPE OF WORK <br /> The following scope of work has been proposed to meet the objective: <br /> Task 1. Obtain Boring Permits and Encroachment Permits; <br /> Task 2. Install Groundwater Monitoring Well and Perform Sampling and Analysis; and <br /> Task 3. Groundwater Monitoring Well Installation Report Preparation <br /> \\Pte mwn\adminnkNwinu\QuikSmp\Quik 132WorkplanOff-aitedoc 3 <br />