Laserfiche WebLink
s <br /> Ltj' 3 r>v <br /> C AM B R A r -. rr Ai. rr ALM, <br /> Go J 'fJune 19, 2000 <br /> Mr. Ron Rowe <br /> Environmental Health Division <br /> San Joaquin County Public Health Services <br /> 304 East Weber Avenue, 3rd Floor <br /> Stockton,California 95201-0388 <br /> Re: Investigation Work Plan <br /> Shell Service Station <br /> 1071 North Main Street <br /> Manteca, California <br /> SJCPHS Site Code: 506313 <br /> WIC#204-4728-0502 <br /> Cambria Project No. 242-0323 <br /> Dear Mr. Rowe: <br /> As requested in your May 19, 2000 letter, Cambria Environmental Technology, Inc. (Cambria) is <br /> submitting this work plan to perform a subsurface investigation at the above-referenced site on <br /> behalf of Equiva Services LLC. Our objective is to define the extent of hydrocarbons, <br /> particularly methyl-tertiary butyl ether (MTBE), in groundwater beneath the site. Our proposed <br /> scope of work for this investigation is described below. <br /> SITE BACKGROUND <br /> The site is an active Shell-branded gasoline service station. Surrounding land use is a mixture of <br /> commercial and residential. An elementary school is located south and southwest of the site.. <br /> a <br /> .1996 Soil Sampling During Site Upgrade: Subsurface investigations performed during upgrade' <br /> activities at the site in 1996 indicated elevated hydrocarbons in soil near the western dispenser <br /> and on the east side of the former underground storage tanks (USTs). The highest total petroleum <br /> Oakland, CA hydrocarbon as gasoline (TPHg) concentration detected in soil was 1,300 milligrams per <br /> San Ramon, CA kilogram (mg/kg) from 13 feet below grade (fbg) from beneath the east end of former <br /> Sonoma, CA <br /> Portland, OR underground storage tanks. This area was subsequently over-excavated to 25 fbg. <br /> Cambria 1998 Groundwater Monitoring Well Installation: In 1998, three groundwater monitoring wells <br /> Environmental (MW-1, MW-2 and MW-3) were installed at the site. No TPHg, benzene, toluene, ethylbenzene <br /> Technology,Inc. <br /> and xylene isomers (BTEX) or MTBE were detected in 'soil samples collected from MW-2 and <br /> 1144 65th Street MW-3. Only low concentrations of these analytes were detected in soil samples from MW-1. <br /> Suite B <br /> Oakland,CA 94608 <br /> Tel(510)420-0700 <br /> Fax(510)420-9170 <br />