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Site <br /> o <br /> Jacackppott Food <br /> od Mart 1434 W Yosemite Ave,Manteca,CA <br /> Time Oil Property No 04-167 <br /> PHS/EHD agreed to permit bi-annual groundwater sampling until closure of the site has been granted <br /> Accordingly, SECOR will conduct the next groundwater sampling event during the Second Quarter of <br /> 1996 <br /> Remediation Activities <br /> In order to determine if bioattenuation is occurring in hydrocarbon-Impacted soils beneath the subject <br /> site, SECOR generated a workplan for the completion of the following scope of work <br /> 1 Prior to conducting field activities, the existing Health & Safety Pian would be amended, and each <br /> sampling location would be checked for the presence of utilities Appropriate permits would be <br /> acquired <br /> 2 A Geoprobe sampling system would be used to collect soil samples from three locations <br /> Continuous-core samples would be collected from each location to a depth of 15 feet below ground <br /> surface (bgs) Care would be taken not to perforate the thin clay lens at approximately 15 feet bgs <br /> Each sampling location would be located in an area previously known to contain hydrocarbon- <br /> Impacted soils <br /> 3 Following sampling, each Geoprobe boring would be backfilled with bentonite <br /> 4 Approximately three soil samples from each sampling location would be submitted to an analytical <br /> laboratory analyzed for TPH-g and BTEX One soil sample from each sampling location would be <br /> analyzed for hydrocarbon-utilizing bacteria and heterotrophic bacteria to assist in evaluating if <br /> bioattenuation is occurring <br /> 5 A report would be prepared which documents field activities and contains analytical reports If <br /> appropriate, site closure would be requested <br /> Time Oil's First Quarter 1996 status report and SECOR's "Quarterly Status Report and Workplan for <br /> Additional Environmental Investigation"dated April 17, 1996 were forwarded to the PHS/EHD and <br /> CRWQCB on April 22, 1996 <br /> Quarterly Status Report - Second Quarter 1996. and Submittal of.First Half 1996 Groundwater Monitoring <br /> Results <br /> Groundwater Sampling Results- First Half 1996 <br /> On May 23, 1996, samples were collected from each of the groundwater monitoring wells (W-3 and W-5 <br /> through W-7) at the subject site by a representative of SECOR Prior to purging, the depth to water in <br /> each well was measured to evaluate elevation, flow direction, and gradient Groundwater with a <br /> northeasterly flow at a rate of 0 001 ft/ft was encountered in the wells at depths of 13 45 feet to 14 62 <br /> feet below ground surface <br /> Since the previous sampling event, groundwater elevation increased in each of the wells by 1 50 feet to <br /> 1 65 feet, or an overall average increase in groundwater elevation of 1 55 feet across the site <br /> Groundwater flow direction changed from southwest to northeast, however, gradient remained consistent <br /> with previously collected data The variations in groundwater elevation and direction are consistent with <br /> previously collected data and most likely due to seasonal variation <br /> Analyses did not indicate presence of hydrocarbons in any of the samples collected from the wells <br /> 7 <br />