Laserfiche WebLink
Shell <br /> Site Investigation Report <br /> Section 6.0 Conclusions <br /> TPHc and BTEX were not detected in any of the soil samples collected by CRA during ENGEO's <br /> geotechnical investigation except for at detection of TPHc at 27 mg/kg in sample 1-B07 at 15 fbg. These <br /> results are consistent with historical soil analytical data that indicate crude oil impact in soil is limited to <br /> isolated locations and does not extend far laterally from the former pipelines. <br /> Crude oil impact in soil near MW-15 is delineated lateral to the former pipelines by B-117 to the <br /> southwest and B-119 to the northeast. Crude oil impact in soil near MW-15 is delineated along the <br /> pipeline alignment to the southeast by boring B-80. However, delineation to the northwest Of MW-15 <br /> along the pipeline alignment was not achieved by advancement of boring B-118. TPHc, benzene, <br /> ethylbenzene, and xylenes were detected in samples from this boring at various depths. Advancement <br /> of a step-out boring to the northwest could not be conducted since access to the adjacent property was <br /> not granted.Vertical delineation of soil impact is also complete given that the borings were advanced to <br /> groundwater. <br /> The soil sample and groundwater sample analytical results from MW-16 provide lateral delineation to <br /> the east for crude oil impacts detected at boring B-109. <br /> All monitoring wells(sans MW-16)and vapor probes were properly destroyed in support of the pending <br /> land development and in compliance with the requirements of the SJCEHD. <br /> Section 7.0 Recommendations <br /> CRA recommends monitoring groundwater at MW-16 on a quarterly basis for one hydrologic cycle,after <br /> which the monitoring frequency will be re-assessed. <br /> CRA does not recommend any other activity in consideration of the remedial excavation work that is <br /> currently underway. <br /> OW223(35) "\ CONESTOGA-ROVERS <br /> September 234 ASSOCIATES <br />