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GROUND ZERO ANALYSIS, INC. <br />3422 Nest Hammer Lane, Suite C-294 <br />Stockton, California 95219 <br />Telephone: (209) 952-3481 <br />Facsimile: (209) 952-9891 <br />September 28, 1995 <br />Mr. Dave Jenkins <br />Regional Water Quality Control Board <br />Central Valley Region <br />3443 Routier Road, Suite A <br />Sacramento, CA 95827-3098 <br />Subject: Revised Boring/Monitoring Well Locations -PROPOSED <br />SCHEDULE OF ACTIVITIES, Roberts Petroleum <br />Services/Woolsey Oil Co., 930 Victor Road, Lodi, <br />California. <br />Mr. Jenkins: <br />Ground Zero Analysis, Inc. (Ground Zero) has prepared this letter <br />to update you on proposed work at the site. <br />At this time the attorney for the site owner is negotiating access <br />agreements to the adjacent properties so the previously submitted <br />Workplan for Additional Site Characterization (dated January 23, <br />1995) prepared by Mill Creek Associates for installation of <br />additional monitoring wells can be implemented with the following <br />modifications. Ground Zero would like to revise the proposed <br />monitoring well locations (as shown on the attached figure), <br />placing one well downgradient and one well crossgradient of the <br />site. If subjective evidence of petroleum hydrocarbons is <br />encountered during drilling of the proposed downgradient well, the <br />boring will be grouted and an alternate location further <br />downgradient will be drilled instead. In addition, Ground Zero <br />proposes to install a product skimmer in well MW -9 in order to <br />reduce the amount of free phase product in groundwater beneath the <br />site. Ground Zero believes the revised monitoring well locations <br />will more adequately characterize the lateral extent -of petroleum <br />hydrocarbons, and the product skimmer will reduce the amount of <br />petroleum hydrocarbons in groundwater originating from the site. <br />After the new wells have been installed and properly developed, <br />Ground Zero will purge and sample all the wells with sufficient <br />water in them to allow sampling. Water samples collected from each <br />newly installed well and existing wells with sufficient water will <br />be submitted for analysis of total petroleum hydrocarbons as <br />gasoline (TPHg), diesel (TPHd), and kerosene (TPHk) using EPA <br />Method 8015; and for benzene, toluene, ethylbenzene, and total <br />