Laserfiche WebLink
r ` <br /> Jimco Truck Plaza - 5 - 5 September 2012 <br /> 1022 E. Frontage Rd. (Hwy. 99) <br /> Ripon, San Joaquin County <br /> Public Participation <br /> Public participation was conducted from 10 March 2012 to 10 April 2012 with no adverse <br /> comments received by this agency. The RP and SJCEHD are in agreement with the closure. <br /> Summary and Recommendations <br /> The RP has complied with all of the requirements in the Regional Board staff letters and <br /> directives, and has adequately assessed TPH-impacted soil and groundwater and threats from <br /> soil vapor intrusion associated with the two Site releases. <br /> Based on the minimal residual contamination in groundwater, limited threats from residual soil or <br /> soil vapor intrusion to human health and/or the environment, with no changes anticipated in Site <br /> use, declining groundwater concentrations estimated to reach WQGs in a reasonable time <br /> frame, compliance with the tasks of Regional Board staff directives and a 13267 Order, and an <br /> adequately defined vertical and lateral extent of pollution, no further action is warranted for the <br /> Site. Staff recommends closure of this Site for both cases (USTs and AGTs). The required <br /> public participation comment period was conducted from 10 March 2012 to 10 April 2012 with <br /> no adverse comments. The monitoring and remediation wells were properly destroyed on <br /> 27 July 2012. The RP and the San Joaquin County Environmental Health Department concur <br /> with case closure. <br /> Attachment 1: Figure 1 Vicinity Map <br /> Attachment 2: Figure 2 Site Plan <br /> Attachment 3: Figure 3 Maximum TPHd in Soil, 0 to 20' bgs <br /> Attachment 4: Figure 4 Maximum TPHd in Soil, 21' to 30' bgs <br /> Attachment 5: Figure 5 Maximum TPHg in Soil, 0 to 20' bgs <br /> Attachment 6: Figure 6 Maximum TPHg in Soil, 21' to 30' bgs <br /> Attachment 7: Figure 7 Maximum MTBE in Soil, 0 to 20' bgs <br /> Attachment 8: Figure 8 Geologic Cross Section A-A' with isocencentrations in soil <br /> Attachment 9: Figure 9 Groundwater Elevation Contour Map, August 2011 <br /> Attachment 10: Figure 10 Hydrocarbon Concentration Map, August 2011 <br /> Attachment 11: Figure 11 Dissolved Phase TPHd Isoconcentration Map, August 2011 <br /> Attachment 12: Figure 12 Dissolved Phase TPHg Isoconcentration Map, August 2011 <br /> Attachment 13: Figure 13 Dissolved Phase MTBE Isoconcentration Map, August 2011 <br />