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1 <br /> Golden Eagle Aviation/Lodi Airport -2- 24 July 2018 <br /> 23987 Highway 99 <br /> Acampo, San Joaquin County <br /> SGM proposes to use a shroud over the sampling equipment during soil gas sample collection, <br /> and to quantify the concentration of leak detection compound [isopropyl alcohol (IPA)] under the <br /> shroud. <br /> Central Valley Water Board staff concurs with the proposed scope of work with the following <br /> conditions: <br /> 1. While the existing monitoring wells are dry, SGM anticipates that groundwater water will <br /> be encountered at approximately 95 feet bgs. However, SGM does not specifically <br /> indicate the anticipated installed depth of the well screen. As such, Central Valley Water <br /> Board staff request that, while the actual installed depth of the well screen may vary <br /> based on encountered subsurface conditions, the well screen should be installed so that <br /> approximately 5 feet are above and approximately 10 feet are below the static water <br /> level. <br /> 2. By 26 October 2018, please submit an Assessment Report which details the completion <br /> of the above scope of work and the resultant findings. In the report, please provide an <br /> evaluation of the data, including comparison of under-shroud leak detection compound <br /> concentrations to those in the corresponding collected samples. Please also include <br /> recommendations for additional work if needed. <br /> 3. Central Valley Water Board staff is aware that records requests from state agencies can <br /> take time. As such, please submit a Sensitive Receptor Survey within 60-days of <br /> receipt of all requested records. Please notify Central Valley Water Board staff via email <br /> upon receipt of all requested records. <br /> If you have any questions or concerns regarding comments in this letter please contact the <br /> undersigned at (916) 464-4615 or by email at alan buehler(awaterboards.ca.aov. <br /> Alan M. Buehler, P.G. o <br /> Engineering Geologist a A AN M. BUEHLER <br /> No.9340 <br /> OFCA4\FOP <br /> cc: Technical Staff, SWRCB, UST Cleanup Fund, Sacramento <br /> Michael Kith, San Joaquin County Environmental Health Department, Stockton <br /> William Little, Advanced GeoEnvironmental Inc., 837 Shaw Rd, Stockton 95215 <br />