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' _ r <br /> 12/10/96 <br /> Mr. Harlin Knoll <br /> Page 2 <br /> MW-5: Discontinue sampling; continue gauging groundwater elevations. <br /> Rationale: Well is located immediately adjacent to well MW-3 and yields little <br /> meaningful additional data. <br /> MW-6: Resume coordinated sampling with Exxon per the discussion in my <br /> 3/22/96 letter to Mr. Knoll and Ms. Thayer. Please provide a contact for Exxon and <br /> Chevron so that this work can take place. <br /> MW-7: Discontinue sampling; continue gauging groundwater elevations. <br /> Rationale: Petroleum hydrocarbons have not been detected since February, 1990, <br /> MW-8: It appears that MW-8 is located downgradient of the Exxon site and very <br /> near a former Chevron site. It is my understanding that confirmed hydrocarbon releases <br /> have occurred at both of these sites. The MW-8 chemical data may, therefore, not be <br /> representative of a release from the BP site. We propose to coordinate any future <br /> monitoring with Exxon and Chevron. Please provide a contact for Exxon and Chevron <br /> so that this work can take place. <br /> AMW-1: Discontinue sampling; continue gauging groundwater elevations. <br /> Rationale: Petroleum hydrocarbons have not been detected since 12/10/91. <br /> AMW-2: Discontinue sampling-, continue gauging groundwater elevations. <br /> Rationale: Aromatic hydrocarbons have not been detected. <br /> AMW-3: Discontinue sampling; continue gauging groundwater elevations. <br /> Rationale: Petroleum hydrocarbons have not been detected since 08/10/90. <br /> AMW-4: Discontinue sampling; continue gauging groundwater elevations. <br /> Rationale: Petroleum hydrocarbons have not been detected since 08/10/90. <br /> AMW-5: Discontinue sampling; continue gauging groundwater elevations. <br /> Rationale: Well is located immediately adjacent to well MW-2 and yields little <br /> meaningful additional data. <br /> AMW-6: Discontinue sampling; continue gauging groundwater elevations. <br /> Rationale: Well is located immediately adjacent to well MW-3 and yields little <br /> meaningful additional data. <br /> We trust that these modifications to the sampling regime will be acceptable to the San <br /> Joaquin County Public Health Services unless we receive contrary direction from your <br /> office. <br />