WORK PLANS - Laserfiche WebLink

Home Browse Search

I Site Investigation Work Plan Nella Oil Station#21,40052 Highway 41,Oakhurst, California 1.0 INTRODUCTION 1.1 Project Description On behalf of California Tank Lines (CTL), Western Resource Management (WRM) has prepared this Site Investigation Work Plan for submittal to the San Joaquin County Environmental Health Department (SJCEHD) and Central Valley Regional Water Quality Control Board (CVRWQCB). 1.2 Site Location and Description ha The subject site is located in the southern part of the City of Stockton, California (Figure 1), on Ilu�o '�1 the southwest corner of the intersection between South El Dorado Street to the east and Ivy'' Avenue to the north (Figure 2). The site is a commercial trucking facility which contains an office building, two truck maintenance shops, a truck-washing rack, a small above-ground storage tank compound, a vehicle fuelling facility, and large parking area for tank trailers. o �u%�sa G�Uoo -� 1.3 Site History and Previous Subsurface Investigations -V In0gg G , Y/2ete-; a;I farrle- 1990, Bi11 Messick Co. removed kwaste oil underground storage tank(UST) from the site.-oy« was a_i�g9L 'Ja.ri . s Y3 l� C3-2 (At z� l3 3 +f dj-�} l�•<-��-� 1ft/vliec, < <-� In 1997, Sierra-Pacific (SP) performed a site investigation in accordance with their approved td� 01 workplan to determine the extent of contamination. fain E S(, vi, In 1998, Station Equipment Company removed a diesel UST from the site. In 1999, Environeering, Inc. (EI) assumed site environmental consulting activities and performed an updated site investigation in accordance with their workplan to further determine the extent of al contamin ttIon. EI conducted groundwatermoppitoringat the site from 1999 2006. i yf l i I rick 3 �ver� rzSti2//ced'J 13-5�✓4s aaI✓Qndeo( �d SO ' e second quarter of 2006, El prepared a workplan to conduct an additional site investigation n as required by a SJCEHD directive letter dated May 22, 2006. The SJCEHD required additional 8 L ,p�,l assessment of the vertical and lateral extent of the impacted soil and groundwater as a result of consistent BTEX detections in MW-4 exceeding California's maximum contaminant levels for a�Vl ,,/MW-4. Alov, 7;' in Addendum to the workplan, which was submitted August 1, 2006, lengthened the proposed /y w* borings from 50 feet to 125 feet and suggested using Cone Penetration Testing (CPT) 6d45' �</technology be used in place of a direct-push borings. During October 22 to October 25, 2007, WRM advanced CPT borings P-1 through P-4 as reported in WRM's September 30, 2008 Site Investigation Results and Site Conceptual Model report. P-1 was advanced west of MW-2, P-2 was advanced on the sidewalk east of MW-2 and north of MW-4, P-3 was advanced west of MW-1, and P-4 was advanced on the east side of S. El Dorado Street, east of MW-4. A fifth CPT boring, S-5, was advanced on the sidewalk south of MW-4 and contiguous to P-8, a boring connected to AGE'S investigation on the adjacent Pacific Pride site. i 1