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iftelhauser 7901 Stoneridge Drive,Suite 123 <br /> c a R P o R A T [ O N Pleasanton California 94588 <br /> (510) 416-2900 Fax(510) 416-0957 <br /> December 3, 1993 <br /> ' Mr Edward C Ralston <br /> Unocal Corporation <br /> 2000 Crow Canyon Place, Suite 400 <br /> ' San Ramon, California 94583 <br /> SUBJECT Monitoring Well MW-3A Installation Report <br /> ' Unocal Station #6348 <br /> 3788 Tracy Boulevard <br /> Tracy, California <br /> ' Dear Mr Ralston <br /> Mittelhauser Corporation (Mittelhauser) has prepared this report to describe the <br /> installation of monitoring well MW-3A at the subject site (see the Site Location Map, <br /> Figure 1 ) Well MW-3A was Installed as a replacement for well MW-3 which was <br /> abandoned on November 24, 1992 in preparation for the tank pull and soil excavation <br /> program that occurred at the site Well MW-3A was drilled and installed on November <br /> 29, 1993 in accordance with the work plan by Mittelhauser entitled Monitoring Well <br /> ' MW-3A Installation Work Plan, dated November 10, 1993 <br /> Well MW-3A was installed by Bayland Drilling (supervised by a Mittelhauser geologist) <br /> ' under San Joaquin County Public Health Services permit number 001574 (attached) <br /> Mr Harlin Knoll of San Joaquin County observed the Installation of the grout seal and <br /> well box <br /> The location of MW-3A is illustrated in Figure 2 (Site Plan) The well was completed <br /> to a depth of 20 feet below the ground surface with 2-inch diameter, schedule 40 <br /> PVC casing The casing consisted 15 feet of 0 02-inch slotted PVC under 5 feet of <br /> blank PVC A traffic rated well box was installed over the well at the surface The <br /> ' Boring and Well Construction Logs are attached to this report <br /> The subsurface soil was sampled every 5 feet during drilling and logged by a qualified <br /> geologist according to United Soil Classification System standards The soils <br /> ' encountered consisted of clayey silt above a depth of 14 feet and sandy silt below a <br /> depth of 14 feet Soil samples from each 5 foot Interval were screened for volatile <br /> Your Partner in Environmental Management <br /> Chicago 1L Indianapolis, IN Laguna Hills, CA Pleasanton, CA <br />