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Ruth Strong Property <br /> 5157 Business Loop 205 <br /> Page 2 <br /> Boring logs of MW-1 and B-4 indicate a layer of fine sand to silty fine sand at <br /> approximately 20 feet bsg between clay layers. Boring logs of B-4, B-5, and B-6 <br /> indicate a sand layer at 10 feet bsg between clay layers. Groundwater is at <br /> approximately 10 feet bsg with gradient direction to the north/northeast. The <br /> horizontal extent of the contamination north, east and south of the former USTs, <br /> and north, west and south of the dispenser island has not been defined. The <br /> combination of shallow groundwater and presence of sand layers in the known <br /> contaminant plume may provide for horizontal migration of the contamination, <br /> and provides the potential for the contamination to come in contact with vertical <br /> migratory pathways. Given the recent substantial elevations of gasoline and <br /> Benzene concentrations in MW-2, additional work to define the horizontal limit of <br /> the plume is required. Submit a work plan that will define the horizontal extent of <br /> the contamination to PHSIEHD by July 1, 1999. <br /> No quarterly monitoring event has occurred since October 16, 1998. Quarterly <br /> monitoring must be conducted and a report submitted to PHSIEHD until no <br /> further action is required. The California Code of Regulations Title 23, Division <br /> 3, Chapter 16, Section 2652(d), states: Until investigation and cleanup are <br /> complete, the owner or operator shall submit reports to the local agency or <br /> Regional Water Quality Board, whichever agency is overseeing the cleanup, <br /> every three months or more frequently as specified by the agency. Conduct the <br /> next quarterly monitoring event by May 20, 1999, and submit a report of the <br /> quarterly monitoring event by June 20, 1999. <br /> If you have any questions, please contact Jeff Wong at (209) 468-0335. <br /> Donna Heran, RENS, Director <br /> Environmental Health Division <br /> Jeffrey Wong , REHS Margaret Lagorio, REHS <br /> LOP/Site Mitigation Unit IV Supervisor <br /> c: Advanced GeoEnvironmental Inc. —Tim Cuellar <br /> c: RWQCB, Central Valley Region -- Mark List <br />