Laserfiche WebLink
T r <br /> 06 October 1997 <br /> AGE-NC Project No. 96-0264 <br /> Page 2 of 5 <br /> with a dark liquid which emitted an intense hydrocarbon odor. <br /> The ensuing work was performed to assess and evaluate potential hydrocarbon-impact on soil in <br /> these areas. <br /> 2.3. REGIONAL GROUND WATER ELEVATION <br /> The estimated depth to ground water at this property is approximately 20 feet below surface grade <br /> (bsg),based on information from Lines of Equal Depth of Water Wells, Fall 1993 published by the <br /> San Joaquin County Flood Control District and Water Conservation District. The PHS-EHD uses <br /> the depth to ground water to calculate the potential impact to ground water from both surface and <br /> subsurface releases of hazardous substances. <br /> 3.0. PROCEDURES <br /> 3.1. SURFACE SOIL SAMPLING <br /> On 18 August 1997 six shallow soil samples were collected from the storm water retention pond on <br /> the eastern edge of the site. The samples were collected to determine if hydrocarbons from the <br /> surface water runoff had impacted the unlined storm water retention pond. <br /> Soil samples were collected from a depth of two feet bsg using a metric soil sampling hanlmer,pre- <br /> loaded with clean, three-inch by two-inch brass sleeves. The sleeves collected were covered with <br /> Teflon sheets, capped and sealed with tape. All samples were labeled. Collected samples preserved <br /> for laboratory analysis were placed in a chilled container,under ice, and transported to McCampbell <br /> Analytical,Inc.,(MAI)under chain-of-custody. The sampling equipment was washed in an Alconox <br /> solution and rinsed with water prior to each sampling run to prevent cross-contamination. <br /> 3.2. PROBING AND SAMPLING <br /> Also on 18 August 1997, eight soil probe borings (131 through B8)were advanced at the site. Probe <br /> borings 131 through B6 were advanced to determine whether an unauthorized release of <br /> hydrocarbons from the three-stage clarifier had impacted the soil at the site. Probe borings B7 and <br /> B8 were advanced to assess soil near the evaporative pond. The soil was sampled outside the <br /> evaporative pond to avoid further damaging its plastic liner. <br /> Probe borings 1,2, 3,4, 7 and 8 were advanced to a depth of 10 feet bsg. Probe borings 5 and 6 were <br />