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Ralph's Square -2- 21 April 2014 <br /> 2211 S. Airport Way, Stockton <br /> San Joaquin County <br /> Our comment on the Work Plan is as follow; <br /> 1. AGE proposes two soil borings in the Work Plan text and shown on Figure 2. However, <br /> Table 1 Soil Data shows that CPT-1, located 40' southeast of the USTs pit and 80' south <br /> of MW-2, reported high soil concentrations in the first CPT-1 sample taken at 15' bgs. <br /> We request a third boring be advanced near CPT-1 and a fourth boring be advanced to <br /> the east between MW-2 and CPT-1 and samples collected at 5 and 10 feet below <br /> ground surface to evaluate if a bio-attenuation zone is present. eftsf e,`7VALv- D <br /> 2. After reviewing the December 2009 Offsite Investigation Work Plan submitted by AGE <br /> and approved by the SJCEHD, we do not concur with the proposal to install Boring B-5 <br /> with one grab groundwater sample to the east along Phelps Street. We request a new <br /> work pian to investigate the downgradient extent of the MTBE groundwater plume, and <br /> installation of monitoring wells to allow for the collection of repeatable groundwater data. <br /> In summary, please submit the following: <br /> • A revised offsite investigation work plan by 30 May 2014. <br /> • An email with the schedule for the soil vapor wells and onsite borings installation <br /> fieldwork by 15 May 2014. <br /> • The second quarter 2014 groundwater monitoring report by 30 July 2014. <br /> You may contact me by phone at (916) 464-4614 or by email at jim.barton(a-Dwaterboards.ca.gov <br /> with your questions. <br /> v'James L.L. Barton, P.G. / <br /> Engineering Geologist <br /> UST Enforcement Unit II <br /> cc: Nuel Henderson, San Joaquin County Environmental Health Department, Stockton <br /> Peter Manion, Hakeem, Ellis & Marengo, 3414 Brookside Rd., Ste. 100, Stockton 95219 <br /> Daniel Villanueva, Advanced GeoEnvironmental, Inc., 837 Shaw Rd., Stockton 95205 <br />