Laserfiche WebLink
I <br /> r /S <br />' PRELIMINARY INVESTIGATION AND EVALUATION RE ORT 7 nom•*1 <br /> Conway Property ��r`` ° <br /> 381 Taddei Road ENWRO11' i-'iENI 1/1 f tEALTH <br />' Aaampo, California pts;,„T/� � <br />' 1. 0 INTRODUCTION <br /> In accordance with a request from Mr. Ron Conway, Geological Audit <br /> Services, Inc. (GeoAudit) has performed an assessment of soil and <br /> possible groundwater contamination of the property located at 381 <br /> Taddei Road in Acampo, California (the site) . One soil boring and <br /> three monitoring wells were installed at the site. The location of <br /> the site is illustrated in Figure 1. A plan of the site is <br /> illustrated in Figure 2 . <br /> 2 .0 BACKGROUND <br /> 2. 1 Land Use <br /> The site is located in a relatively flat rural area of northwestern <br /> San Joaquin County (Figure 1) _ The property is part of a small <br /> rural subdivision. The surrounding area is used primarily for <br /> agricultural purposes (grape vineyards) . The Mokelumne River lies <br /> approximately 1, 200 feet south and a slough lies approximately 500 <br /> feet north of the site. <br /> It is our understanding that one 500 gallon leaded gasoline tank <br /> I and one 350 gallon unleaded gasoline tank were removed from the <br /> site on 31 October 1989 . The tanks were owned and operated by Lodi <br /> Concrete Pipe Service, which was formerly located at the site. <br /> 2.2 Previous Work <br /> A slight hydrocarbon odor was noted in the soil under the tanks <br /> after the tanks were removed. Two soil samples were collected for <br /> analyses. TPH as gasoline and BTE&X were detected in both samples. <br /> An overexcavation of the tank pit was performed on 18 July 1990 and <br /> five soil samples were collected from the walls and floor of the <br /> excavation. Hydrocarbon odors were noted in two samples and <br /> laboratory analyses indicated significant levels of petroleum <br /> hydrocarbons (TPH as gasoline at 4 , 000 ppm and 10, 000 ppm) and <br /> purgeable aromatics (benzene at 62 ppm and 41 ppm; toluene at 87 <br /> ppm and 430 ppm; ethylbenzene at 35 ppm and 150 ppm; and xylene at <br /> 293 ppm and 850 ppm) in these samples. <br /> These results indicate that residual soil contamination remains as <br /> a result of the two gasoline tanks removed in 1989. Mr. Harlan <br /> Knoll of the PHS/EHD has concluded that contaminated soil may have <br /> been 3n contact with seasonal high groundwater in 1986, and <br /> 1 <br />