SITE INFORMATION AND CORRESPONDENCE

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r two RAMAGE ENVIRONMENTAL Sacramento Office Post Office Box 869 Rancho Murieta, CA 95683 Tel (916) 354-3250 Fax (916) 354-1786 ��1 July 16, 2001 u — - '7! ; iI) JUL 1 8 2001 E PEiRMIT IEiV I HEALTH Mr. Harlin Knoll, Sr. R.E.H.S. ISERViCES San Joaquin County PHS/EHD 304 East Weber Avenue, 3rd Floor Stockton, CA 95201-0388 Re: Letter Work Plan —Monitoring Well Installation and Groundwater Sampling San Joaquin County Motor Pool, 1810 E. Hazelton Avenue, Stockton, California PHS/EHD Site Code: 1141 Dear Mr. Knoll: On July 6, 2001, it was a pleasure to meet with you and Ms. Kerry Wasson of the San Joaquin County Facilities Management Department to review the above-referenced project. Based on our review of the project data and tour of the site vicinity, we agreed to disregard Work Plan, Additional Site Assessment submitted on March 16, 2001 by Tait Environmental Management, Inc. (Tait). Instead we decided that one groundwater monitoring well should be installed between the site and an operating city of Stockton water supply well, and that groundwater samples should be collected for analysis from the monitoring well network and the city of Stockton well. This letter outlines the methods and procedures for implementing these proposed tasks. SCOPE OF WORK Monitoring Well Installation, Development and Elevation Survev To determine the groundwater gradient and flow direction, and to evaluate the extent of impacted groundwater toward the operating city of Stockton well, one groundwater monitoring well will be installed, developed and surveyed(Site Plan attached). The well will be installed in 8-inch diameter soil boring drilled by a truck-mounted drill rig, equipped with hollow stem augers. It will consist of approximately 20 feet of two- inch diameter, Schedule 40, flush-threaded and machine-slotted(0.020-inch)PVC well screen. Since groundwater was previously encountered at approximately 45 feet bgs,the well will be drilled to a total depth of approximately 55 feet, and constructed with a screen interval of approximately 35 to 55 feet bgs. Blank PVC casing will thread into the top of the well screen and extend to the surface.