FIELD DOCUMENTS - Laserfiche WebLink

Home Browse Search

' . KLEINFELDER ' 4.2 TEMPORARY WELL INSTALLATION AND SAMPLING ' Based on the field observation during excavation, that discolored soil and petroleum odors were located near or at groundwater, Fitzpatrick Homes retained Kleinfelder to conduct a limited ' groundwater assessment in the vicinity of Large Excavation C (LE-C). Kleinfelder prepared a workplan and well permit application to submit to San Joaquin County Public Health Services Department, Environmental Health Division (PHS/EHD). Kleinfelder developed a workplan titled ' "Limited Groundwater Assessment, Monogram Collection Property, (Former R&B Trucking Company), 1785 N. Corral Hollow Road,Tracy, California", dated July 2,2001. ' 4.2.1 Workplan Preparation. Permitting and Pre-Field Activities Kleinfelder delivered the groundwater assessment workplan and well application to Mr. Harlin ' Knoll of PHS/EHD on July 3, 2001. Mr. Knoll was generally agreeable to the workplan but commented that he wished to place one of the four proposed temporary wells between SE-B and ' LE-C at the approximate location of TW-2 shown on Plate 2. Mr. Knoll also suggested that five oxygenates be added to the suite of analyses to be run on the samples. The workplan and well application was verbally approved on July 3, 2001 with the comments listed above. For a copy of the well boring permits, please refer to Appendix E. The proposed well boring locations were marked in white paint and Underground Service Alert ' was notified at least 48 hours prior to drilling activities. 4.2.2 Temporary Monitoring Well Installation ' Four soil borings (TW-1 through TW-4) were advanced on July 5, 2001. Two of the wells were ' installed north of LE-C near the northern property boundary. One well boring was advanced southeast of LE-C and the fourth well boring was located southwest of LE-C and northeast of SE-B (Plate 2). The borings were advanced to approximately depths of 20 feet below,ground surface (bgs) The soil borings were advanced using attack-mounted drill rig equipped with 8-inch diameter hollow stem auger. Soil samples were collected at depths beginning at approximately 4 and 7 ' feet and 12 and 17 feet bgs at each well location for logging purposes and potential chemical analysis. No unusual odors or soil discoloration were noted from soil samples or soil cuttings. First encountered subsurface water was noted in all four borings about 10 feet bgs. ' The borings were drilled, logged, and sampled according to the protocol described in Appendix B. A two-inch temporary monitoring well was constructed in each of the four borings, as generally ' described in Appendix B, Section B-3.1. However since these wells were temporary, grout was not included in the construction. Each of the four wells were screened from about 10 to 20-feet bgs. The wells were screened using Schedule 40 PVC pipe with 0.010-inch factory cut slots. A copy of ' the boring log and well construction details is presented in Appendix A. ' 20-4341-I1.E01/2011R959 Page 13 of 31 ' Copyright 2001,Kleinfelder,Inc. August 21,2001