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Wm. J. Hunter & Associates � '� ,�;a Rl it �- ' 2220 Loma Vista Or. Registered Geologists Sacramento, CA 95825 Petroleum & Mineral Appraisers Ci qe, _� ��; �J (916) 972-7941 �� '.,J FAX(9 16) 972-1683 July 30 , 1996 Steven Sasson, RENS San Joaquin County PHS Environmental Health Division 445 No. San Joaquin Street Stockton, CA 95202 Ref : Eighth Quarterly Groundwater Monitoring Report & Details of Placement of Monitoring well ##4 - 921 W. Fremont Street, Stockton. It was mentioned in the June 27 , 1996 quarterly report that a fourth monitoring well was placed in May; details of that work are described below. PLACEMENT OF MONITORING WELL ##4 : On May 2, 1996 . Charles Fry, RG from Wm. J. Hunter & Associates, arrived on location at 0730 hours to make sure site was clear & to notify nearby property owners of the work. V & W Drilling, • Inc . auger rig and crew arrived at 0800 ; due to overhead telephone lines, the location previously selected would put the rig mast too close for safety. After further review of possible alternate locations, it was decided to cancel the job and use a rig capable of working with restricted overhead clearance . On May 7, 1996, Spectrum Exploration mobilized a short mast auger rig equipped with 5 foot lengths of 10 1/411 OD hollow stem augers . Work began at 0900 hours under the direction of Charles Fry, RG. Augers were advanced to 5 ' at which point a California Modified split spoon sample barrel was lowered into the hole and pushed to 616" . The sample chamber was retrieved, placed on a clean surface, and carefully opened by the geologist . Recovery consisted of 18" of dark brown slightly silty clay; refer to PLATE I for complete details . One of the metal sleeves was promptly sealed with teflon tape & plastic end caps, and the ends were secured with duct tape . The preserved tube was labeled and placed on ice pending transfer to the laboratory . The augers were advanced to 8 ' bgl and a weighted tape was lowered into the hole to check for water entry. No entry was observed, and the augers were advanced to 1.0 ' bgl . A clean sample chamber was lowered into the augers and driven from 10 ' to 111611 . The barrel was handled as noted above; recovery consisted of 12" of reddish brown silty clay. Additional details are given on PLATE I . One metal sleeve was sealed and preserved according to WJH field protocol . 1