Laserfiche WebLink
,.mpR <br /> April 18, 1999 U <br /> -I. -.'IAL HEAL. . <br /> Mr. Michael Infurna, Sr. REHS i l SERMCE;S <br /> San Joaquin County PHS <br /> Environmental Health Division ' <br /> P.O. Box 388 <br /> Stockton, CA 95201-0388 <br /> Re: Scope of work letter: Former Canteen Facility, 1500 Shaw Road, Stockton, CA; <br /> Site Code 1727, AES Project No. 145-94009-01 <br /> Dear Mr. Infurna: <br /> This letter is to inform you of the future work Applied Earth Sciences, Inc. (AES) is <br /> proposing for the referenced site: AES is proposing to install two monitor wells and four soil <br /> borings. The first monitor well (MW-13D)will be installed to a total depth of 120 feet, and <br /> the second monitor well (MW-13) to a total depth of 46 feet. The four soil borings will be <br /> drilled to a maximum total depth of 120 feet each. The proposed locations of the wells are <br /> shown on Figure 1. The purpose of MW-13D is to continue to evaluate the soil and <br /> groundwater quality at depths of historically low groundwater levels (approximately 120 feet <br /> in 1978). Groundwater levels at this site have ranged from approximately 45 to 75 feet <br /> below surface grade since 1993. <br /> Soil samples will be collected at five-foot intervals during the monitor well and soil <br /> boring installations. The samples will be screened in the field for the presence of volatile <br /> organics using a PID meter. Field screening of samples will determine which soil samples <br /> collected will be submitted to a California Department of Health Services approved <br /> laboratory for analysis. As referenced in the September 25, 1997 memo published by the <br /> Public Health Services San Joaquin County Environmental Health Services the soil sampling <br /> parameters for MW13-D will include Benzene, Toluene, Ethyl-Benzene, and Total Xylenes <br /> (BTEX)by EPA Method (8020); Total Petroleum Hydrocarbons Gasoline Range Organics <br /> (TPHg) by EPA Method (8015); Di-isopropyl Ether (DIPE), Ethyl-Tertiary Butyl Ether <br /> (ETBE), Methyl-Tertiary Butyl Ether (MTBE), Tertiary-Amyl Methyl Ether (TAME), and <br /> Tertiary-Butanol by EPA Method 8260 (Oxygenates); Methanol and Ethanol. All other soil <br /> samples will be anylyze for MTBE and BTEX by EPA Method 8020. Additional samples <br /> may be submitted to confirm positive results. <br /> Groundwater samples will be collected from the monitor wells and submitted to an <br /> appropriate California laboratory for analysies. The water sampling parameters will include <br /> BTEX (8021), TPHg (8015), and Oxygenates (8260) as referenced above. <br /> 2833 Trinity Square, Suite 149 9 Carrollton, Texas 75006 • Tel: (972)416-7171 • Fax: (972)416-7175 <br />