Laserfiche WebLink
MURRAY & ASSOC1ATE6 <br /> ��= ENVIRONMENTAL SERVICES <br /> April 7, 1992 <br /> RECEivEM& <br /> JAN 2 7 @§1 V <br /> ENVlRONI Vqt <br /> qfAlttp <br /> Mr. James M. Langston P�hitoi `�g-0L RYiPk§ <br /> P.O. Box 97 <br /> Lathrop, CA 95330 <br /> RE: Environmental Investigation - Langston's Market, 15615 Seventh Street, Lathrop, <br /> California <br /> Dear Mr. Langston: <br /> This letter report summarizes our work for the subsurface investigation at the subject site, <br /> and presents the results of all on-site drilling and sample collection. The investigation was <br /> initiated as a result of til,e failure of a 4,000-gallon underground fuel tank in March, 1991 <br /> which occurred following a helium pressure test. Approximately 1,200 gallons of leaded <br /> gasoline was lost from the tank. The purpose of this work was twofold: First, to <br /> determine the areal and vertical extent of gasoline contamination in the soil, and whether <br /> groundwater quality has been impacted by the gasoline; and second, if groundwater quality <br /> has been impacted, how far has the contaminant plume migrated. Shallow groundwater <br /> at the site is encountered at a depth of 17.5 feet. <br /> To accomplish these goals, a series of borings were drilled and samples collected at 9, 14 <br /> and 17 feet. A 580B photoionization detector (PID) calibrated for benzene was used to <br /> screen the soil samples in the field. No samples were submitted for chemical analysis. <br /> FIELD ACTIVITIES AND OBSERVATIONS <br /> Soil Borings <br /> A Vicinity Map showing the site location is presented in Figure 1. A Site Plan showing <br /> the boring locations is presented in Figure 2. Exploratory borings 1 through 8 were drilled <br /> to a depth of 17 feet. Auger cuttings were analyzed on-site by using a PID. Results of <br /> the PID readings are presented in Table 1. <br /> The soil borings were drilled using a hand-held rotary hammer equipped with 2-inch <br /> diameter continuous flight solid stem auger equipment. All augers were steam-cleaned <br /> prior to use to minimize the potential for cross-contamination. <br /> 5051 Lexington Circle, Loomis, CA 95650 (916) 652-0458 • FAX (916) 652-0464 <br />