Laserfiche WebLink
1 <br /> Ile 5.2 contamination <br /> Low levels of hydrocarbon contamination exist in the soil and <br />' groundwater in the .immediate vicinity of the UST pit. This <br /> contamination does not extend to the northeast as far as MW--1 or to <br /> the west as far as MW-3 . The low levels suggest that the <br />' contamination is aerially limited, but more precise contamination <br /> limits cannot be defined with present data. The contaminated <br /> groundwater plume may extend beyond the southern property line. <br />' 5.3 Further Mork <br /> In accordance with Tri-Regional Board guidelines, GeoAudit <br />' recommends that one additional monitoring well be placed south of <br /> MW-2 , in the downgradient direction, to delineate the contamination <br /> limit in this direction. Depending on logistics and permit <br /> considerations, this well could be located either in the street or <br /> south of it. <br /> GeoAudit also recommends that the wells be monitored on a quarterly <br />' basis for a period of one year to determine whether a groundwater <br /> remediation program is required. <br /> Due to rising groundwater levels, the existing soil contamination <br /> could lead to further groundwater contamination. To prevent this, <br /> GeoAudit recommends additional soil excavation to remove the <br /> contaminated soil. Moderately high TPH-g concentrations were <br /> detected at a depth of 30 feet in Boring #1, indicating that <br /> excavation should be planned to a depth of at least 35 feet. <br /> 6 . 0 LIMITATIONS <br /> Our professional services were performed using that degree of care <br /> and skill ordinarily exercised by environmental consultants <br /> practicing in this or similar localities. The findings were based <br /> upon analytical results provided by an independent laboratory. <br /> Evaluations of the geologic/hydrogeologic conditions at the site <br /> for the purpose of this investigation are made from a limited, <br /> number of available data points (i.e. monitoring well) and <br />' subsurface conditions may vary away from these data points. No <br /> other warranty, expressed or implied, is made as to the <br /> professional recommendations contained in this report. <br />' 5 <br />