Laserfiche WebLink
GRO <br /> t Lopez Property (9647-0770) <br /> January 1997 <br /> hydrocarbons identified as gasoline (TPH-g) and benzene, toluene, ethylbenzene, and total xylenes <br /> (BTEX}. The analytical results indicated that a release of petroleum hydrocarbons had occurred.. <br /> Adjacent to and south of the property is a Tri-Valley Growers canning facility. The canning <br /> facility includes former underground storage tanks (USTs) and a forklift shop within 50 feet of the <br /> southern site boundary. A group w ter pumping and remediation program was initiated at this site in <br /> 1991. A case closure request for thji.s site was submitted in 1995. <br /> In November 1994, three soil borings were drilled and sampled at the subject site by RAH <br /> Environmental, Inc. (Figure 2). Soil boring SBA was advanced at the former UST location to evaluate <br /> the vertical extent of the release. Chemical analysis of soil samples collected from soil boring SBA <br /> 'vindicated that petroleum hydrocarbons were present below the water table. Ground water samples <br /> were collected through hollow-stem augers at the location of the borings and analyzed for the presence <br /> of TPH-g and BTEX. The analytical results indicated the,greatest concentrations were detected at the <br /> location of SBA On the basis of these results, RAH Environmental, Inc., concluded that the source of <br /> the,petroleum hydrocarbons found in soil boring SBA most probably came from the former UST on <br /> the Lopez property. <br /> In February 1996, Fugro supervised the advancement of five drill holes (MW-1, MW-2, <br /> MW-3, SB-Al, and S13-A2) at the locations illustrated on Figure 2. The drill holes were advanced to <br /> approximate depths ranging from 20.5 to 35.5 feet. The highest TPH-g concentrations in soil were <br /> identified at 5,500 mg(kg in drill hole SB-A2 at a depth of 16 feet. Fugro has since conducted two <br /> quarterly ground water monitoring events. The results of the findings has not detected the presence of <br /> TPH g nor BTEX in ground water. <br /> Scope of Services <br /> Task 1 -Preparation of Technical Work Plan,Project Management and Permitting <br /> Fugro will prepare and submit a technical work plan and site health & safety plan to the San <br /> Joaquin County PHS/EHD for its approval prior to initiating field activities. The work plan will <br /> describe sample collection procedures, sample locations, frequency of sampling and sample analysis. In <br /> addition, we will obtain the necessary permits for exploratory drill holes from the county. <br /> Task 2 -Drinking Water Well Survey <br /> Fugro will conduct a drinking water well survey for wells located within a 2000-foot radius of <br /> the subject property. Fugro will contact the California Department of Water Resources and the local <br /> municipal water district to obtain information regarding the presence of drinking water wells within the f <br /> specified search distance. <br /> Task 3-Field Activities <br /> To further define the vertical. extent of soil and ground water contaminants, Fugro will oversee <br /> the advancement of one drill hole in the vicinity of the removed underground storage tank (refer to <br /> ,-.96470774.PH2 2 <br />