ARCHIVED REPORTS XR0001845 - Laserfiche WebLink

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i Ct of Lodz Downtown Investigation C1995+) In 1995 the city of Lodi began to investigate a widespread distribution of solvents and cleaning agents present in the central portion of the city This investigation has developed into an extensive groundwater i investigation The extent of this survey is depicted on Figure 2 The former Parmar Texaco site is included within the investigation and along the current eastern border of the greater Lodi groundwater investigation site This investigation has lead to numerous groundwater monitoring wells and soil borings being placed within this area No direct investigative work has occurred on the former Parmar Texaco property but has occurred within several blocks of the site No other work is known to have occurred on the property 2.2 Current Invests ation Objectives A workplan to conduct an expanded site assessment evaluation of the site was submitted to PHSE14D on April 12, 2003 and approved by PHSEHD on April 20, 2003 The current phase of investigative work at the site was divided into three primary tasks These tasks were designed to complete the following objectives (1) Develop a worker health and safety plan that reflects the current knowledge of expected environmental-related conditions at the site, (2)Drill and sample a series of soil borings to a depth of 40 to 60 feet bgs across and adjacent to the former fuel dispensers and USTs The placement of these soil borings and associated groundwater grab samples was designed to confirm the horizontal and vertical extent of petroleum hydrocarbon contamination on the site, and, (3) Completion of three new groundwater monitoring wells to determine the horizontal extent of petroleum hydrocarbon contamination in the V groundwater zone at the site Additional objectives included the conduct of a Sensitive Receptor Survey and preparation of a Site Conceptual Model and preliminary Problem Assessment Report The basic assumption regarding the petroleum hydrocarbon contamination in soil and groundwater beneath the site is that an ongoing unauthorized release of gasoline fuel was most likely occurring during the life of the service station(1950 to 1984) Groundwater flow direction of the shallow aquifer has typically been to the southwest or south (Figure 5) based on the city of Lodi groundwater investigations Information gathered from previous investigations at the site and the quarterly monitoring events in 2a6 and 3`d quarter of 2003 at the site substantiates this Miam\n1EnvummenW\PannuTexaco\Repods\SAR1203 wpd Page 10