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is i.i i - i � _ ❑ x <br /> ,* File Edit Go To Favorites Help f <br /> -- — _ <br /> Search Favorites � - ''• <br /> Addressighttps:/Igeotracker.waterboards,ca,goy/esi/uploads/geo_report/95974084731TO6077OD430.PDF Go Unks " <br /> / 46 + * 102--/- <br /> EXECUTIVE SUMMARY <br /> Groundwater at Valley Motors was monitored on September 25,2008.The depth to groundwater is <br /> approximately) foot deeper than in June(bcrwecn 31.3 and 32.3 feet below grade).The j <br /> groundwater flow direction remains eastward,at a gradient of 0.0047 MI. <br /> Groundwater samples were collected from seven of eight monitoring wells.All samples were <br /> analyzed for Total Petroletun I lydrocarbons in the range of gasoline and volatile aromatic <br /> compounds(IKFEX).TPH-g concentrations increased by 18%in VM-1 and 37%VM-2,but <br /> decreased by 20°/r,-30%in most of the other wells. Wells around the mapped margin of the plume <br /> have had TPHg concentrations that tire slightly above or below 100 parts per billion for the past few <br /> quarters,and it appears that they have reached an irreducible limit and will likely continue to be <br /> impacted at about the same concentration indefinitely.This probably reflects long-term exposure to <br /> the hydrocarbons,causing the well casing and surrounding sand pack to become a low- <br /> concentration source for hydrocarbons to desorb and become dissolved in water in the well.There <br /> is no indication that hydrocarbons are migrating and causing these perimeter wells to become <br /> increasingly impacted. <br /> In view of the stable groundwater flown direction and hydrocarbon plume and the State's current <br /> financial problems that are affecting the ability of Responsible Parti4s to receive reimbursement <br /> from the Underground Storage Tank Cleanup Fund,the most prudent course of action is to confine <br /> the scope of work to regular groundwater monitoring for the immediate future. <br /> a urs 2orie <br /> r y:From A <br /> haps,/Igeotracker.waterboards.ca.gov/esiluploadsigeo_report/95974084731TO607700430 PDFjo Internet <br /> J Im <br /> +Start ( ,' Inbox-Microsoft... Errvision40 A82686 Regulators...https://geotracker...,I 1 https.//geotrack— ., Microsoft Word I «n 3:t i PM <br /> g A� <br /> l � <br />