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Site Assessment Report <br /> 1022 Frontage Road <br /> C A M B R I A Ripon, California <br /> December 16, 2005 <br /> commercial well is located 175 ft southeast of the site on Ripon Farm Service property and is screened <br /> from 176 to 196 ft bgs A third domestic well is located at 23066 South Highway 99 and is screened <br /> from 180 to 200 ft bgs Detailed findings of the well survey are presented in AGE's Well Survey and <br /> Site Model dated June 6, 2003 The closest water body to the site is the Stanislaus River which is <br /> located approximately 9,000 ft south of the site <br /> 3 0 PREVIOUS INVESTIGATIONS <br /> Below is the chronology of site assessment, feasibility testing and interim remedial activities at the <br /> site Historical soil and groundwater analytical data are presented in Tables 1 and 2, respectively <br /> October 1996 In October 1996, AGE drilled borings*B 14 through *B16 along the southern border <br /> of the site These borings were part of AGE's delineation of a hydrocarbon plume originating from —4pfU <br /> the adjacent Ripon Farm Services property,located south of the site TEC Accutite collected split soil res'vlLl Ze)e"re- <br /> fs <br /> and grab groundwater samples on behalf of Olympian Oil Total petroleum hydrocarbons as diesel r*if4 <br /> / d Lt, <br /> (TPHd) was detected only in boring *1315 at W ft bgs at a concentration of 1 milligrams per h <br /> kilogram(mg/kg) Total petroleum ydroca�rbons as gasoline(TPHg)was detected to all4 V q,)17 <br /> o� <br /> • at concentrations ranging�om to « Sg Be�xizege_w�as detected in borings *B 15 and *B 16 f_►7 iJEe�oc <br /> at concentrations ranging froi�i E ll Gfab��grroundwater samples were collected from <br /> borings *B 14 and 1316 The highest dissolved-phase TPHd, TPHg, aud_benze& were detected at <br /> concentrations of L5 _10%,.,4�micrograms per liter (µg/L), respectively, in boring *B14 <br /> located near the southern site boundary <br /> May 1998 In May 1998, AGE oversaw the installation of groundwater monitoring wells MW-6, <br /> MW-7, and MW-8 to assess the extent of a hydrocarbon plume related to the adjacent Ripon Farm <br /> Services property located south of the site A 20 ft bgs soil sample was collected from each of the well <br /> pilot borings TPHd was detected in each sample and concentrations ranged from 1 1 to 490 mg/kg <br /> The highest TPHd concentration detected was from the pilot boring for well MW-6 No benzene was <br /> detected in any of the soil samples The only sample analyzed for TPHg was from the pilot boring for <br /> well MW-7 and TPHg was detected at a concentration of 6 mg/kg <br /> June 1998 In June 1998,Walton Engineering(Walton)of West Sacramento,California removed six <br /> fuel dispenser islands and associated piping Soil samples were collected by Grayland Environmental <br /> (Grayland)of Davis,California during the fuel dispenser and product piping removal activities(FD 1 <br /> . through FD6,PLI through PLA) TPHd was only analyzed and detected in soil samples FD4 through <br /> FD6, and PL3 and PL4 at concentrations ranging from 3 3 to 13,000 mg/kg TPHg was detected in <br /> 3 <br />