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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 />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. <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 plan 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 ,waterboards.ca.gov <br />with your questions. <br />1>i <br />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 />