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' -fes►.. - _ .. - I - ,.. Monitoring Well Install tion'Work Plan QUICKI-KLEEN CAR WASH. 707 EastYoserxiite Avenue,Manteca, California 1.0.. . INTRODUCTION : At the.request'of,Ms. Marylou Pontes of Qdicki-Kleeil Car.Wash,Advanced GeoEnvironmental, Inc. (AGE)has prepared this work plan for the installat on of three ground water monitoring wells at 707 East Yosemite Avenue, Manteca,-California(si e).,The location of the site is illustrated on -Figure-1. A site plan is illustrated on Figure 2. . The San Joaquin County Public Health Services.-•Envi onme'ntal Health Division(PHS-EHD)has directed by letter.dated 03 October 2001 that a work pan be prepared to investigate the extent of contamination in the ground water at the site.This work plan is prepared in accordance with Central Valley Regional Water Quality Control Board '(CVR QCB),guidelines for the investigation of underground storage tanks (UST) sites. This work plan=provides.a description.of the scope of work and procedures"for the installation.of three groundwater monitoring wells, and collection an analysis of soil and ground water samples. 2.0. BACKGROUND The,site is located at 707 East Yosemite Avenue, M riteca, California. The site is located in.'a . topographically.flat area at an elevation between 30 and 35 feet above mean sea level in the city of Manteca, California. Based on the most recent 7investi ation at the site the approximate 'depth to ground water at the site is 15 to 20 feet below surface ga de(bsg).The property is currently occupied by the Quicki-Kleen Car Wash; consisting of apne-stdry food mart and car wash facility. The site, buildiiigs.are located north of the fiiel dispenser islands andU8T&Presently the facility operates one split 20,000-gallon UST containing 5,000 gallons of diesel fuel,5,000 gallons of premium unleaded. . fuel and 10,000 gallons of regular unleaded fuel. µ In February 1999, three USTs were removed from thes ite.In October 1998, six soil probe borings .were advanced at the site and in January 2001, five so 1 probe,borings were advanced at the site. Background information and results of previous investigations can be,found in the AGE-prepared document preliminary Investigation and Evaluation R port,dated.19 March 2001. Soil and ground water analytical data from these investigations can be fund in Tables-1 through 4. A cross-section, , depicting the general lithology'and the approximate dis ribution of contaminants in the soil beneath the site is illustrated on Figure 3. The lateral extent of impacted soil has'beenidefined on he site. The vertical extent of impacted soil has been defined on the site with the exception of directly beneath the former dispenser locations.. Advanced GeoEnvironmental,Inc.