Laserfiche WebLink
en vzroso <br /> February 14, 1996 <br /> L <br /> Ms. Mary Meays <br /> San Joaquin County Public Health Services <br /> Environmental Health Division <br /> P.O. Box 388 <br /> Stockton, California 95201-0388 <br /> RE: Work Plan <br /> Shell Service Station <br /> 7910 Lower Sacramento Road <br /> Stockton, California <br /> WIC No. 204-7524-0808 <br /> Dear Ms. Meays: <br /> Enviros, Inc. (Enviros) has prepared this work plan on behalf of Shell Oil Products <br /> Company to describe subsurface investigation activities at the subject site (Plates 1 and 2). <br /> This work plan has been prepared in response to San Joaquin County Public Health <br /> Services (SJCPHS) correspondence dated January 3, 1996. Activities will be performed in <br /> accordance with SJCPHS and Central Valley Regional Water Quality Control Board <br /> (CVRWQCB) guidelines. <br /> Site Description and Background <br /> The site is presently an operating service station located on the Lodi South 7.5 minute <br /> topographic map at T2N, R6E section 16 SWIA, NEI/4. The assessors parcel number for <br /> the site is 077-330-49. The site area is approximately 0.37 acres, and is located in a <br /> commercial area of Stockton. The property is bordered to the south by Hammer Lane, to <br /> the west by Lower Sacramento Road, and to the north and northeast by a shopping center. <br /> Site equipment includes three 12,000-gallon, double-walled fiberglass underground storage <br /> tanks (USTs). <br /> Two 5,000-gallon and two 8,000-gallon steel USTs and associated piping were removed <br /> from the site in December 1988 and January 1989. Samples T-I through T-8 were <br /> collected at a depth of approximately 15 feet below grade (fbg) beneath the former tanks. <br /> Concentrations of Total Petroleum Hydrocarbons calculated as Gasoline (TPH-G) ranged <br /> from none detected (ND) to 4,880 parts per million (ppm). In January 1989, samples were <br /> collected from beneath the product lines and dispenser islands during product line <br /> excavation. Sample T-3, collected beneath the western dispenser island contained a <br /> TPH-G concentration of 1,510 ppm. <br /> In August 1989 a site investigation was performed to evaluate the extent of petroleum <br /> hydrocarbons identified during UST and product line removals. Wells MW-I thorough <br /> MW-3 were installed in the vicinity of the former USTs. Soil samples collected from 56.5 <br /> fbg in these well borings were ND for TPH-G and for benzene, toluene, ethylbenzene, and <br /> xylenes (BTEX). Soil boring SB-1 was drilled near the western fuel dispenser island <br /> sampling location T-3. Samples from 11.5 fbg and 41.5 fbg from this boring were ND for <br /> TPH-G and BTEX. Soil boring SB-2 was drilled near the southern dispenser island, in the <br /> vicinity of sampling location T-1. Samples from 11.5 fbg and 41.5 fbg from this boring <br /> were ND for TPH-G and BTEX. Soil boring SB-3 was drilled through the former UST <br /> Envfros, Inc. 270 Perkins Street Sonoma, California Tel 707/935-4850 <br /> P.O. Box 259 95476-0259 Fax 707/935-6649 <br />