Laserfiche WebLink
C A M B R I A <br /> March 27, 2006 <br /> Mr Mike Infurna <br /> San Joaquin County <br /> Environmental Health Division (SJCEHD) <br /> 304 East Weber Avenue, Third Floor <br /> Stockton, CA 95202 UA Do <br /> MAR y <br /> Re Subsurface Investigation Report NVl�� <br /> Chevron Service Station#9-1848 l ��Jr i`' 7 lel ALTH <br /> 1257 West Yosemite Avenue �'� PERM1f/,�, RVICES <br /> Manteca, CA <br /> Dear Mr Infurna <br /> Cambria Environmental Technology, Inc (Cambria) is submitting this Subsurface Investigation <br /> Report on behalf of Chevron Environmental Management Company (Chevron) for the site <br /> referenced above The work was proposed in Cambria's Revised Subsurface Investigation <br /> Workplan dated July 8, 2005 and approved by the SJCEHD in a letter dated July 12, 2005 <br /> (Attachment A) Cambria advanced three Geoprobe soil borings to approximately 40 feet below <br /> grade (fbg) with three depth discrete groundwater grab samples to define the vertical and lateral <br /> extent of hydrocarbons in soil and groundwater The site background, details of the investigation, <br /> laboiatoiy results, site conceptual model, mass calculations, and Cambria's conclusions are presented <br /> below <br /> SITE BACKGROUND <br /> Site Description The site is an active Chevron branded service station located on the north side <br /> of State Route 120 (Yosemite Avenue) in Manteca, California (Figure 1) Site facilities include a <br /> station building, two dispenser islands, and three underground storage tanks (USTs) in a common <br /> pit (Figure 2) Surrounding land use is mixed residential and commercial <br /> Site Geology Sediments beneath the site consist primarily of silt, clay and silty sand with <br /> interbedded sand lenses to a maximum explored depth of 31 fbg Groundwater has been <br /> encountered at approximately 19 tbg during previous investigations Historical groundwater data <br /> Cambria infers a flow direction of northeast <br /> Environmental <br /> Technology,Inc <br /> Opportunity Drive <br /> wte 1 10 <br /> Roseville,CA 95678 <br /> Tel(916)677-3407 <br /> Fax(916)677-3687 <br />