Laserfiche WebLink
--- --------- ------- <br /> _ ... <br /> V M <br /> '11( <br /> %TC. <br /> ter• <br /> A S S O C I A T E S I N C <br /> Summary Report of <br /> Additional Subsurface Investigation is <br /> Glover Property <br /> 7675 West Eleventh Street <br /> Tracy, California <br /> ATC Project No. 17861.0001 <br /> `= 1.0 INTRODUCTION <br /> i; <br /> ,.: ATC Associates Inc. has prepared this letter report, on behalf of Dr. A.R. Glover to summarize <br /> findings of the additional subsurface investigation performed at the above referenced site (Figure <br /> 1). The purpose of the subsurface investigation was to evaluate the extent of residually impacted <br /> _= soil and groundwater northwest of the former underground storage tanks (USTs). This work was <br /> performed at the request of San Joaquin County Public Health Services, Environmental Health <br /> Division (PHS/BHD). The findings of the subsurface investigative study are summarized in the <br /> following paragraphs. <br /> 1.1 Site Location <br /> The project site is located at 7675 West Eleventh Street, between MacArthur Drive and Chrisman <br /> Road, in Tracy, California. The site location is shown on Figure 1. The vicinity of the site is E <br /> k=`=1 <br /> primarily a commercial and industrial area. The property is owned b Dr. A.R. Glover. E <br /> P Y P P Y Y <br /> The site is located on generally level terrain which slopes gently toward the Tom Paine Slough, a <br /> --- northwest trending extension of the delta located approximately 2.5 miles north of the site. <br /> 1_2 Background_ <br /> On October 15, 1986, two 500-gallon gasoline underground storage tanks (USTs) were removed <br /> from the site. During removal of the USTs, petroleum product was observed in the southern <br /> portion of the UST excavation (Figure 2). Soil samples were collected from 2 feet below the <br /> bottom of the USTs, and petroleum constituents and lead were detected in the soil samples. <br /> On July 18, 1995, Smith Technology supervised the installation of three groundwater monitoring <br /> wells, MW-1, MW-2, and MW-3 at the locations shown on Figure 2. During installation of the <br /> monitoring wells, soil samples were collected from the borings. On July 21, 1995, Smith <br /> Technology developed and sampled monitoring wells MW-1, MW-2, and MW-3. Analytical <br /> results of the soil samples collected delineated the vertical extent of petroleum hydrocarbon. <br /> contamination of the vicinity of the former gasoline UST locations. This phase of work is detailed <br /> 1:D <br /> wA130991reportslsumwe1.doc 1 <br />