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v 1 <br /> Page 2 <br /> November 23, 1992 <br /> #9-4057 - Stockton <br /> s MW-1 through MW-3 were resurveyed as a part of this site assessment using the same <br /> benchmark. New wellhead survey data indicates a change in well head elevation from the previous <br /> survey data. <br /> s The ground water gradient at the site is flat; therefore, any errors in ground water measurement <br /> could significantly change the calculated ground water flow direction. <br /> • As documented in Pacific Environmental Group, Inc.'s Work Plan, a municipal ground water <br /> supply well is located 1,400 feet to the northwest of the site. Ground water extraction from that <br /> well may be affecting the local ground water flow direction. <br /> s The ground water elevation has decreased approximately 10-feet since 1986. This change in <br /> water level may have affected the local ground water flow direction. <br /> We recommend monitoring the ground water levels in the wells on a monthly basis for a period of <br /> three (3) months to confirm the ground water flow direction. Once flow direction has been <br /> confirmed, we will evaluate the data for appropriate next actions with respect to installation of <br /> additional wells and corrective actions. The site will also be set up on a quarterly ground water <br /> monitoring and sampling program. Additionally, we will research the use of the municipal well to <br /> determine when the well is used and if it's use could affect the ground water flow at the Chevron <br /> site. <br /> Effective immediately, I will no longer be the Chevron Project Manager for the referenced site. <br /> The new Project Manager and your contact for all future correspondence will be Mr. Brett Hunter. <br /> If you have any questions or comments, please contact Brett at (510) 842-8695. <br /> Vry ly youUS�.AODU <br /> T <br /> EV ON U JIC�- MPANY <br /> cy Vuke i <br /> Site Assessme and Remediation Engineer <br /> Enclosures <br /> cc: Mr. Gordon Boggs, RWQCB-Central Valley <br /> Mr. J. Lawrence Pearson, RWQCB-Central Valley <br /> Ms. L.B. Williams, 555/4023 <br /> Mr. J.N. Robbins, Chevron Park/V 1156 <br /> Ms. B.C. Owen <br /> Mr. Richard Macey <br /> Macey&Brisco <br /> 4609 Quail Lakes Drive, Suite 4 <br /> Stockton, CA 95207 <br /> File(9-4054A 1) <br />