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<br /> <br />Central Valley Regional Water Quality Control Board <br /> <br />5 February 2025 <br /> <br />Anderson-Barngrover Ranch Company <br />c/o David Taylor <br />1997 Calusa Trail <br />Middleburg, FL 32068 <br /> <br />REQUEST TO COMPLETE MONITORING WELL INSTALLATION; <br />ANDERSON-BARNGROVER RANCH, 14290 EAST COMSTOCK ROAD, LINDEN, <br />SAN JOAQUIN COUNTY; CASE #392009, GLOBAL ID #T10000020864 <br /> <br /> <br />Central Valley Water Board staff (Staff) reviewed the Work Plan for Installation of <br />Additional Groundwater Monitoring Well (Work Plan) dated 24 January 2025. This <br />document was submitted on your behalf by Brusca Associates Inc. (Brusca) for the <br />Anderson-Barngrover Ranch underground storage tank (UST) petroleum release case at <br />14290 East Comstock Road in Linden (Site). <br /> <br />In the Work Plan, Brusca proposes to install a groundwater monitoring well (MW-4) <br />approximately 570 feet west of existing Site well MW-3. The proposed location is <br />approximately 190 feet east of an agricultural irrigation supply well (Ag Well) on the <br />adjacent property. Brusca proposes installing MW-4 in order to delineate the plume to the <br />west and as a sentry well for petroleum hydrocarbons migrating west toward the Ag Well. <br /> <br />Brusca proposes to install the well as follows: <br /> <br />Well Total <br />Depth <br />Screened <br />Interval <br />Sand <br />Pack <br />Interval <br />Bentonite <br />Thickness Soil Sampling <br />Time between <br />installation <br />and <br />development <br />Time between <br />development <br />and <br />groundwater <br />sampling <br /> (ft bgs) (ft bgs) (ft) (ft bgs) (hours) (hours) <br />MW-4 80 60-80 58-80 1-2 <br />5-80 <br />(5ft intervals; <br />lithology only) <br />≥72 ≥24 <br />ft= feet; bgs= below ground surface; ≥= greater than or equal to <br /> <br />Staff concurs. By 9 May 2025, please complete the well installation, development, and <br />sampling and submit a well installation report. <br /> <br />In a 16 January 2025 directive letter, Staff requested that you submit a well installation <br />work plan and an evaluation of the risk to Main Well from the Site release by