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' PHASE VI SUBSURFACE INVESTIGATION Site Code 2163 Montgomery Ward Auto Service Center 5400 Pacific Avenue Stockton, CA was steam cleaned prior to use and between each well to prevent cross-contamination Approximately ninety gallons of water were removed from each well during development 3 3 GROUND WATER SAMPLING Pursuant to approval from the County (Mr Michael Infurna), the Initial sampling of wells MW-3 through MW-6 was completed as part of the first quarter 1995 ground water monitoring I activities Well purging and sampling information of wells MW-3 through MW-6 is contained in the EAI, 1995B report ' 34 SAMPLING EQUIPMENT CLEANING PROTOCOL All augers were steam cleaned prior to the drilling of each boring The drive sampler was disassembled and decontaminated prior to each sampling by the following procedure - All excess soil was scraped off the sampler parts, ' - The sampler was washed in a solution of Alconox detergent and tap water, and - The sampler was rinsed with tap water and then distilled water I The steel bailer (Equipment), used only to purge and develop the wells prior to sampling, was steam cleaned between each event as part of the decontamination procedures 3 5 EFFLUENT HANDLING All effluent generated during assessment activities was sealed in labeled 55-gallon Department of Transportation (D O T ) approved drums The drums were stored on-site, pending the results of the analytical testing, at which time the appropriate disposal method was determined 36 QUALITY ASSURANCE/QUALITY CONTROL ' In addition to the quality assurance and quality control procedures previously described herein, two types of blanks, trip and equipment, were included in the investigation A trip blank (MW- 420) was prepared on the day of sampling by filling one 40-m1 VOA vial with purged deionized water The equipment blank (MW-520) was obtained after decontaminating the drive sampler (see Section 3 4) by filling the drive sampler with deionized water and transferring the water to two 40-m1 VOA vials The blanks were handled in a manner identical to the samples collected in the field The laboratory were not Informed that these samples were blanks 3 7 MONITORING WELL SURVEY ' Kier and Wright Civil Engineers and Surveyors, Inc (K & W), California licensed land surveyors, were retained by Montgomery Ward to survey the locations for wells MW-3 through iv1W-6 anu to ueterrrilnC Lit "top of Gasulg" elevations reiauve to mean sea level This surveying was conducted on February 5, 1995 and was correlated to the other Montgomery Ward wells and those on the Unocal site, which were also previously surveyed by K & W The elevation of all the wells were surveyed to the City of Stockton Benchmark No 14 (elevation = 10 95 feet Mean Sea Level), located on the east side of Pacific Avenue at the approximate center line of Yokuts Road (See Appendix E) ' Project No 1232 6 ENVIRONMENTAL AUDIT, INC