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"iftelhauser <br /> C o R P Q R A T i o ff 7901 Stoneridge Drive Suite 123 <br /> Pleasanton California 94588 <br /> (5TO) 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 Repor€ <br /> Unocal Station #6348 <br /> 3788 Tracy Boulevard <br /> Tracy, California <br /> Dear Mr Ralston <br /> Mlttelhauser Corporation (MIT€elhauser) 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 drifted 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 Bayfand 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 6 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 IL Indianapolis IN + Laguna Hills CA It Pleasanton, CA <br />