Laserfiche WebLink
Emcon <br /> 1433 North Market Boulevard • Sacramento California 95834-1943. (916)928-3300. Fox(916)928-3341 <br /> 101 <br /> November 22, 1995 <br /> Project 0805-140 02 <br /> Mr.Kyle Christie <br /> ARCO Products Company <br /> P. O Box 612530 <br /> San Jose,California 95161 <br /> Re: Third Quarter 1995 Status Report for ARCO Products Company Service Station <br /> No. 0548, Located at 1612 Hammer Lane, Stockton,California <br /> Dear Mr. Christie: <br /> At the request of ARCO Products Company (ARCO), EMCON is conducting an <br /> environmental investigation at the subject site (see Figure 1). We have prepared this status <br /> report on the work conducted during the third quarter 1995, which included measuring depths <br /> to groundwater, collecting groundwater samples from the wells for subjective and laboratory <br /> analyses, and calculating the groundwater gradient and direction of groundwater flow beneath <br /> • the site <br /> BACKGROUND <br /> From December 1990 through November 1993, RESNA Industries (RESNA (formerly <br /> Applied GeoSystems]) observed the drilling of 21 bonngs (B-1 through B-21) and the <br /> installation of five on-site groundwater monitoring wells (MW-I through MW-5), one off- <br /> site groundwater monitoring well (MW-6), and four vapor extraction wells (VW-I <br /> through VW-4) (RESNA, June 26, 1992, Report No 30004-4; RESNA, June 21, 1993, <br /> Report No 30004-8, and RESNA, May 11, 1994, Report No 30004-8) The locations of <br /> soil borings, wells, and other site features are presented on Figure 2 Residual <br /> hydrocarbons were analytically identified in soil samples collected from the borings near <br /> the tank cavity Low concentrations of hydrocarbons were detected in soil samples <br /> collected from bonngs near the dispenser islands <br /> During drilling of soil boring B-18, a product line was accidentally fractured and product <br /> leaked into adjacent soil RESNA collected a soil sample from 6 feet below the product <br /> line (S-6-PL I), gasoline hydrocarbons were detected in this sample. RESNA installed one <br /> vapor extraction well (VW-4) near the product release Total petroleum hydrocarbons as <br /> gasoline (TPHG), and benzene, toluene, ethylbenzene, and total xylenes (BTEX) were <br /> below laboratory detection hmits in soil collected at 1 I feet, 26 feet, and 46 feet below <br /> . ground surface (bgs) <br /> 1 <br /> RESNA began monitoring the groundwater in wells MW-I through MW-4 on <br /> October 30, 1991 (RESNA, June 26, 1991, Report No 30004-4) Wells MW-5 and <br /> SAON%PIOM5%OW31400 2Es-94Wm 2 <br />