Laserfiche WebLink
GROUNDWATER MONITORING WELL INSTALLATION <br /> Marlowe Properties <br /> 4648 Waterloo Road <br />' Stockton, California <br />' INTRODUCTION <br /> At the direction of Mr. Jonathan Marlowe of Marlowe Properties, <br /> Geological Audit Services, Inc. (GeoAudit) has supervised the <br /> installation of a single monitoring well and collected soil and <br /> water samples at the referenced property (the site) . <br /> This report describes the installation procedures and presents the <br /> results of the soil and water sampling. The project background, <br /> procedures, findings and conclusions are contained in the following <br /> Isections. <br /> BACKGROUND <br /> The site is located in a flat industrial area east of Stockton <br /> (Figure 1 - Location Map, 7 . 5 Minute Stockton East Quadrangle, USGS <br /> Topographic Map Series, 1976) . Located on the site are a large <br /> warehouse, a small office building, two fenced storage yards and a <br /> parking/delivery area (Figure 2 - Site Plan) . The facilities are <br /> currently vacant. <br /> On 4 January 1988, a 550-gallon underground storage tank was <br /> removed from the site by RAMCON, Inc. of West Sacramento. The tank <br /> stored gasoline and was used to fuel vehicles for the former <br /> tenants, a plumbing company and a sheet metal company. <br /> After the tank was removed, RAMCON collected soil samples from a <br /> depth of approximately 17 feet. Total petroleum hydrocarbons (TPH <br /> as gasoline) and volatile aromatics (BTE&X) were detected 1n soil <br /> samples. <br /> Investigation of the contamination associated with the UST was then <br /> continued with the installation of two soil borings on 7 July 1988 . <br /> The soil borings were installed at the site by Applied GeoSystems <br /> of Sacramento. B-1 was advanced to a depth of 30 feet. Field <br /> screening did not indicate contamination at this depth. A sample <br /> collected at this depth dial not indicate the presence of any <br /> hydrocarbon contamination. However, the detection limits for BTE&X <br /> exceeded state guidelines for the analysis of BTE&X. <br /> B-2 was advanced to a depth of 80 feet. Field screening of samples <br /> indicated that hydrocarbon contamination was encountered beginning <br /> at a depth of 30 feet and continuing to a depth of 75 feet. Two <br /> soil samples from this boring underwent laboratory analysis. <br /> Contamination was detected in sample S--45-B2 (45 foot depth) and in <br /> sample S-60-B2 (60 foot depth; see report dated 5 August 1988) . B-2 <br /> was completed as monitoring well MW-1, and a water sample was 28 <br /> I <br />