SITE INFORMATION AND CORRESPONDENCE FILE 1

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PUBLIC JL 1EALTH SER ti ICES opa ! SAN JOAQUIN COUNTY r. y ENVIRONMENTAL HEALTH DIVISION , Ernest M. Fujimoto, M. D., M.P.H., Acting Health Officer 304 East Weber Avenue, Third Floor • Stockton, CA 95202 209/468-3420 p ; ROGER HUCKINS FEB 64 71997 3501 OAKGROVE CR STOCKTON CA 95209 RE : Former Underground Tank Site SITE CODE : 505309 1201 S . Center St. Stockton , CA 95206 San Joaquin County Public Health Services , Environmental Health Division ( PHS- EHD) has reviewed the "Work Plan - Phase 1 Site Investigation " as submitted by your consultant, Foothill Engineering , and has the following comments . The proposal to place only one "push-bore" at the area of the former Tank 1 and Tank 2 area is approved but will require a groundwater sample to be taken also and analyzed for the same constituents as you proposed for the soil samples . The "standard 2" PVC monitoring well" you proposed to place at former Tank 3 area if "obvious conditions exist as to the contamination of the soil" is approved under the following conditions . The screened interval proposed at 10 feet long will be inadequate due to extreme groundwater level fluctuations . Groundwater recharge and seasonal draw-down conditions will require modifications to ensure that the well will be in service as the groundwater drops during the drier months of summer. It is recommended that a 20 foot screened interval be installed with at least 12 to 15 feet of screen below the depth to water at the time of installation . A complete and detailed construction diagram of the revised monitoring well should be submitted to PHS- EHD prior to the final workplan approval and should show all dimensions , lengths , and materials to be used in the construction of the well . The piping line from Tank 3 to the former dispenser is still in the ground and has not been properly destroyed or sampled . In order to properly complete the tank closure and prior to any site certification , the line must be sampled and destroyed in place or removed . PHS- EHD recommends that you include this procedure in this workplan 's addendum or plan on addressing this procedure in the very near future . Please have your consultant submit an addendum or revised workplan that includes the above noted items . Push-bores and monitoring well installations require a permit. Enclosed for your convenience is a blank application for the borings and well . After your California C-57 licensed well drilling contractor completes and signs the form , please submit it to PHS- EHD with a $89 check. A Division of San Joaquin County Health Care Services