WORK PLANS - Laserfiche WebLink

Home Browse Search

l 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 EI 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. s -� 1 .3 Site History and Previous Subsurface Investigations o-V e, a G�) 600 /�Ugg . 4' Y/Letcra ; C fgnl� In019907 Bill Messick Co . removed kwaste oil underground storage tank ( UST) from the site . - oy« was Q i� g9L Ja .ri . s Y3 IC3 -a (Atyd z� l3 3 +f dj -z} �� • <� � - � �i,+ In 1997, Sierra-Pacific (SP) performed a site investigation in accordance with their approved tdoqsl� 01 / workplan to determine the extent of contamination . fain E ,;(Y-.-gid , In 1998, Station Equipment Company removedA 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 Lll contamin tten�on . EI conducted groundwater the site from 1999 2006 . yf t irzSti2 //ced' J 13 -5 ✓ as a0I✓Qneeo( fd -0 , e second quarter of 2006, EI 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 ,y �,7 assessment of the vertical and lateral extent of the impacted soil and groundwater as a result of re consistent BTEX detections in MW-4 exceeding California's maximum contaminant levels for a� d,/MW-41 p/oV 7, ; ee in Addendum to the workplan , which was submitted August 1 , 2006, lengthened the proposed mw* borings from 50 feet to 125 feet and suggested using Cone Penetration Testing (CPT) /J45' k</technology be used in place of a direct-push borings . During October 22 to October 25, 20072 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 . EI 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