ARCHIVED REPORTS_XR0009361 - Laserfiche WebLink

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3.0 Environmental Receptors • The site is predominantly surrounded by residential and commercial properties The nearest water well is reportedly located approximately 600 feet to the southwest of the site, in the anticipated upgradient direction This well was listed in the EDR report, however, no indication of the well was noted during the door-to-door survey and the owners could not be located Shaw contacted the property manager of the Tracy Inn, who appears to be the current owner of the property that the well is located on The property manager was not aware of any well The City of Tracy does use groundwater as a drinking water source, with the nearest active municipal supply well located 650 feet to the north This well is located in the anticipated downgradient direction Because of the overall distance, low concentrations of petroleum hydrocarbons found on the site, and the off-site city supply well's 250-foot deep sanitary seal, the potential for impact to that well are minimal The nearest surface body of water to the site is the Upper Main Canal, located approximately 3,600 feet to the south of the site There are no pathways to exposure for human receptors within the vicinity of the site The majority of the entire site has been developed, with no animals noted on the property There are no signs of stress to vegetation at the site The source, release methods, potential pathways, and receptors are depicted in Figure 9 4.0 Summary Based on the findings in this report, Shaw concludes the following • No petroleum analytes were detected in soil samples from the 500-gallon heating oil UST removed in February 2002 • A groundwater sample collected from the excavation following removal of a 2,000-gallon diesel UST in March 2002 contained 130 ppb of TPH-D Soil samples collected from the excavation and pipeline trench contained TPH-D up to 5 0 ppm • A soil and groundwater investigation conducted in September 2002 detected TPH-D in the groundwater at concentrations up to 390 ppb, and in a soil sample at 2 7 ppm • No BTEX constituents or MTBE has been detected in any soil or groundwater samples collected from the site CNCD104-28-031SHARE11JM03-0027 doc 14