ARCHIVED REPORTS XR0011896 - Laserfiche WebLink

Home Browse Search

/ A S S O C I A T E S I N C . �1 Summary Report of -Additional Subsurface Investigation Glover Property. - 7675 West Eleventh Street Tracy, California ATC Project No., 17861.0001 lam; 1.0 INTRODUCTION; ATC Associates Inc. has prepared this letter report, on behalf of Dr. A.R. Glover.to summarize' findings of the additional subsurface investigation performed at the above referenced site (Figure 1). The purpose of the subsurface investigation was to evaluate the vertical extent of impacted t soil in the vicinity of the former underground storage tanks (USTs) and possible lateral migration L� of impacted groundwater between wells MW4 -and MW5. This work was. performed at the { . request. of San Joaquin County Environmental Health Department(EHD). The findings of the r subsurface investigative study are summarized in thefollowing-paragraphs. 1.1 Site Location ` Ther Ject site is located at 76.75 West Eleventh Street between MacArthur Drive and P J Chrisman Road,In Tracy, California. The site location is.shown on Figure 1. The vicinity of the r ` site is primarily a commercial and industrial area. The property is owned by Dr. A.R. Glover. The site is located on generally level terrain which slopes gently toward the Tom Paine Slough, a -northwest trending extension of the`delta located approximately 2.5 miles north of the site. 1_2 Background On October 15, 1986,. two 500-gallon gasoline USTs,•we're removed from the site. During removal of the USTs, petroleum product was observedin the southern,portion of the UST excavation (Figure 2).. Soil samples were collected-from 2 feet below the bottom of the USTs, and petroleum constituents and lead were detected in.the soil_samples. On July 18, 1995, Smith Technology supervised.the installation of three groundwater monitoring wells, MW-1, MW-2, and MW-3 at the locations.shown on Figure-2. During installation of the f monitoring wells, soil samples were collected from the .borings. On July 21, 1995, Smith Technology developed and sampled monitoring wells MW-1; MW-2, and MW-3. Analytical results of thesoil samples collected delineated.the vertical extent of petroleum hydrocarbon contamination of the vicinity of.the former gasoline. UST locations: This phase of work is sA17861\rep6rts\sum2004.dod 1 r .